Зоологический журнал, 2020, T. 99, № 8, стр. 877-888

Contributions to the study of Oribatid mites (Acari, Oribatida) of Sri Lanka

S. G. Ermilov a*, A. A. Khaustov a**, O. Joharchi a***

a Tyumen State University
625003 Tyumen, Russia

* E-mail: ermilovacari@yandex.ru
** E-mail: alkhaustov@mail.ru
*** E-mail: j.omid2000@gmail.com

Поступила в редакцию 5.03.2019
После доработки 26.05.2019
Принята к публикации 26.05.2019

Полный текст (PDF)

Аннотация

An annotated check-list of the oribatid mite taxa of Sri Lanka is provided, including 144 species from 91 genera and 47 families. A new species of the genus Galumna (Galumnidae) is described. Galumna paratetraporosa sp. n. differs from G. tetraporosa Ermilov, Martens et Tolstikov 2014 in its smaller body size, the presence of a median pore and a sejugal suture, the localization of the aggenital setae, and the absence of a well-developed rostral point.

Keywords: Oriental region, Sri Lanka, Oribatida, fauna, systematics, morphology, Galumna

Sri Lanka (total area 65.61 km2) is an island country in South Asia, located in the Indian Ocean, southwest of the Bay of Bengal and southeast of the Arabian Sea. The island is geographically separated from the Indian subcontinent by the Gulf of Mannar and the Palk Strait.

Oribatid mites (Acari, Oribatida) of Sri Lanka are relatively poorly known (e.g., Oudemans, 1915; Balogh, 1970, 1988; Mahunka, 1973, 2001; Niedbała, 1991, 2000). At present, 98 species, 61 genera and 32 families have been recorded. Our work is based on material that was collected during a biological expedition to Sri Lanka in January, 2019.

The primary goal of our paper is to provide a list of the oribatid taxa known from this country, including primary and secondary data.

The second goal of our paper is to describe and illustrate one new species, belonging to the nominative subgenus Galumna Heyden 1826 (Galumnidae). Galumna, which comprises three subgenera and about 200 species (Ermilov, Klimov, 2017; Subías, 2004, updated 2018) has a cosmopolitan distribution. The generic and subgeneric diagnoses of Galumna have been previously presented by Ermilov and Klimov (2017). Identification keys to the species of Galumna from the Ethiopian, Neotropical, Oriental, and Australian regions have previously been published by Ermilov et al. (2015, 2018), and Ermilov and Starý (2017).

MATERIAL AND METHODS

Material. Sri Lanka, Sabaragamuwa Province,  Polgampola, latitude 06°27′47.2″ N, longitude 080°12′38.8″ E, altitude 42 m a. s. l., litter in the mixed forest near the Thambadola Ella waterfall, 24.I.2019 (O. Joharchi, S.G. Ermilov, A.A. Khaustov). Three litter samples (1 kg each) were collected by hand method and extracted into 75% ethanol using Berlese’s funnels (without electric lamps) during seven days in the laboratory.

Methods. Specimens were mounted in lactic acid on temporary cavity slides for measurement and illustration. Body length was measured in lateral view, from the tip of the rostrum to the posterior edge of the notogaster. Notogastral width refers to the maximum width of the notogaster in dorsal view. Lengths of body setae were measured in lateral aspect. All body measurements are presented in micrometers. Formulas for leg setation are given in parentheses according to the sequence trochanter–femur–genu–tibia–tarsus (famulus included). Formulas for leg solenidia are given in square brackets according to the sequence genu–tibia–tarsus.

Drawings were made with a camera lucida using a Leica transmission light microscope “Leica DM 2500”.

Morphological terminology used in this paper follows that of F. Grandjean (see Ermilov and Klimov (2017) for review and application).

The following abbreviations are used: L – lamellar line; S – sublamellar line; N – prodorsal leg niche; E, T – lateral ridges of prodorsum; ro, le, in, bs, ex – rostral, lamellar, interlamellar, bothridial and exobothridial setae, respectively; Ad – sejugal porose area; D – dorsophragma; P – pleurophragma; c, la, lm, lp, h, p – notogastral setal alveoli; Aal, Aam, Al, A2, A3 – notogastral porose areas; mp – median pore; ia, im, ip, ih, ips – notogastral lyrifissures; gla – opisthonotal gland opening; h, m, a – subcapitular setae; or – adoral seta; sac – axillary saccule; Pd I, Pd II – pedotecta I, II, respectively; 1b, 3b, 4a, 4b – epimeral setae; dis – discidium; cp – circumpedal carina; g, ag, an, ad – genital, aggenital, anal and adanal setae, respectively; iad – adanal lyrifissure; Ap – postanal porose area; p.o. – preanal organ; Tr, Fe, Ge, Ti, Ta – leg trochanter, femur, genu, tibia, tarsus, respectively; p.a. – porose area; ω, σ, φ – leg solenidia; ɛ – leg famulus.

FAUNA

During the taxonomic identification of oribatid mite material from Sri Lanka, we have registered 54 species (excluding unidentifiable species) from 45 genera and 28 families. Of these, 46 species, 30 genera and 15 families have been recorded in this country for the first time. That way, the up-to-date list of oribatid mites known from Sri Lanka now includes 144 species from 91 genera and 47 families (Table 1).

Table 1.  

Annotated check-list of oribatid mites of Sri Lanka

Taxa Distribution of species Records in Sri Lanka
first record of species PD
Brachychthoniidae*      
Liochthonius simplex (Forsslund 1942)** Semicosmopolitan New record +
Sellnickochthonius gracilis (Chinone 1974)** Japan, Iran, southern China New record +
Epilohmanniidae*      
Epilohmannia minuta pacifica Aoki 1965** Tropical, Subtropical and southeastern Palaearctic regions New record +
Phthiracaridae      
Notophthiracarus extraordinarius Niedbała 2000 Sri Lanka Niedbała, 2000
Notophthiracarus ignobilis Niedbała 2000 Sri Lanka Niedbała, 2000
Notophthiracarus mirus Niedbała 2000 Sri Lanka Niedbała, 2000
Notophthiracarus turgidus Niedbała 1991 Sri Lanka Niedbała, 1991
Phthiracarus anonymus Grandjean 1933 Semicosmopolitan Niedbała, 2000
Phthiracarus membranifer Parry 1979 Palaearctic region, Sri Lanka Niedbała, 2000
Phthiracarus paratubulus Niedbała 1991 Sri Lanka Niedbała, 1991
Phthiracarus pygmaeus Balogh 1958 Semicosmopolitan Balogh, 1988
Plonaphacarus kaszabi (Balogh 1988) Sri Lanka Balogh, 1988
Plonaphacarus kugohi (Aoki 1959) Semicosmopolitan Niedbała, 2000
Euphthiracaridae      
Acrotritia ardua (C.L. Koch 1841) Semicosmopolitan Niedbała, 2000
Acrotritia curticephala (Jacot 1938) Semicosmopolitan Niedbała, 2000
Acrotritia hauseri (Mahunka 1991) Oriental and Palaearctic regions Niedbała, 2000
Acrotritia spiculifera Mahunka 1991 Australian, Ethiopian and Oriental regions Niedbała, 2000
Oribotritiidae      
Austrotritia saraburiensis Aoki 1965 Australian, Oriental and Palaearctic regions Niedbała, 2000
Indotritia javensis (Sellnick 1923) Semicosmopolitan Niedbała, 2000
Indotritia propinqua Niedbała 1991 Oriental and Palaearctic regions Niedbała, 2000
Mesoplophoridae      
Apoplophora pantotrema (Berlese 1913) Australian, Oriental and Palaearctic regions Niedbała, 2000
Mesoplophora (Parplophora) subtilis Niedbała 1981 Australian, Neotropical and Oriental regions Niedbała, 2000
Hypochthoniidae*      
Malacoangelia similis Sarkar et Subías 1982** India New record +
Lohmanniidae*      
Javacarus kuehnelti Balogh 1961** Australian and Oriental regions, Egypt New record +
Mixacarus quadrifasciatus Balakrishnan 1986** India New record +
Trhypochthoniidae*      
Afronothrus incisivus Wallwork 1961** Tropical and Subtropical regions New record +
Malaconothridae*      
Malaconothrus adilatatus Ermilov, Anichkin et Tolstikov 2014** Vietnam New record +
Malaconothrus dorsofoveolatus Hammer 1979 Oriental region, Vanuatu New record +
Malaconothrus variosetosus Hammer 1971 Australian and Oriental regions New record +
Nanhermanniidae      
Cyrthermannia stellata Balogh 1970 New Guinea, Sri Lanka Balogh, 1988
Dendrohermannia monstruosa (Aoki 1977)** Australian and Oriental regions New record +
Masthermannia mammillaris (Berlese 1904)** Tropical and Subtropical regions New record +
Hermanniidae      
Phyllhermannia tenuiseta Balogh 1988 Sri Lanka Balogh, 1988
Plasmobatidae*      
Plasmobates asiaticus Aoki 1973** Oriental region, Japan New record +
Neoliodidae*      
Neoliodes bataviensis Sellnick 1925** Australian region, Java, Japan New record +
Plateremaeidae      
Paralopheremaeus legendrei (Balogh 1962) Ethiopian region, Sri Lanka Balogh, 1988
Plateremaeus latus Balogh 1988 Sri Lanka Balogh, 1988
Damaeolidae*      
Fosseremus laciniatus (Berlese 1905)** Cosmopolitan New record +
Oxyameridae*      
Oxyamerus polilloensis Corpuz-Raros et Lit 2005** Philippines New record +
Eutegaeidae      
Dudichella membranigera Balogh 1970 Sri Lanka, Fiji Balogh, 1970
Neseutegaeus denticulatus Balogh 1988 Sri Lanka Balogh, 1988
Astegistidae      
Cultroribula bicuspidata Mahunka 1978 Ethiopian, Neotropical and Oriental regions New record +
Cultroribula diversa Oudemans 1915 Sri Lanka Oudemans, 1915
Machadobelbidae      
Machadobelba ceylonica Balogh 1970 Sri Lanka Balogh, 1970
Zetorchestidae      
Zetorchestes saltator Oudemans 1915 Oriental and Palaearctic region Oudemans, 1915 +
Eremulidae*      
Eremulus densus Hammer 1979** Java New record +
Eremulus spinosus Ermilov et Anichkin 2011 Vietnam New record +
Oppiidae      
Heteroppia globigera Balogh 1970 Sri Lanka Balogh, 1970 +
Oppiella nova (Oudemans 1902)** Cosmopolitan New record +
Oxyoppia (Oxyoppiella) polynesia (Hammer 1972)** Australian, Neotropical and Oriental regions New record +
Pulchroppia pendula (Balogh 1970) Sri Lanka Balogh, 1970
Porrhoppia crux Balogh 1970 Sri Lanka Balogh, 1970
Striatoppia modesta Mahunka 1988** Borneo New record +
Machuellidae*      
Machuella ventrisetosa Hammer 1961** Tropical, Subtropical and Palaearctic regions New record +
Teratoppiidae      
Granuloteratoppia annulata Balogh 1988 Sri Lanka Balogh, 1988
Suctobelbidae      
Fenestrobelba annulata Balogh 1970 Sri Lanka Balogh, 1970
Parasuctobelba complexa (Hammer 1958)** Neotropical and Oriental regions New record +
Suctobelbella (Flagrosuctobelba) insulana (Hammer 1972)** Australian and Oriental regions New record +
Suctobelbella (Flagrosuctobelba) elegantula (Hammer 1958) Semicosmopolitan New record +
Suctobelbella (Ussuribata) variosetosa (Hammer 1961) Tropical and Subtropical regions, Japan New record +
Suctobelbila baderi Mahunka 1988** Borneo New record +
Rhynchoribatidae      
Eurhynchoribates (Orinchobates) orientalis (Balogh 1970) Sri Lanka Balogh, 1970
Otocepheidae      
Dolicheremaeus alveolatus (Oudemans 1915) Sri Lanka Oudemans, 1915
Dolicheremaeus ceylonicus Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus conjunctus Mahunka 1973 Sri Lanka Mahunka, 1973
Dolicheremaeus densefoveolatus Balogh 1988 Sri Lanka Balogh, 1988
Dolicheremaeus elisabethae Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus furcula Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus lineatus Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus markusi Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus pectinatus Balogh 1970 Sri Lanka Balogh, 1970
Dolicheremaeus robustus Mahunka 1973 Sri Lanka Mahunka, 1973
Dolicheremaeus trimucronatus Mahunka 1973 Sri Lanka Mahunka, 1973
Pseudotocepheus amonstruosus Mahunka 1973 Ethiopian and Neotropical regions, Sri Lanka Mahunka, 1973
Pseudotocepheus neonominatus Subías 2004 Sri Lanka Mahunka, 1973 +
Eurostocepheus (Cerostocepheus) trisetosus Balogh 1970 Oriental region Balogh, 1970
Megalotocepheus ceylonicus Balogh 1970 Sri Lanka Balogh, 1970
Megalotocepheus loksai Balogh 1970 Sri Lanka Balogh, 1970
Megalotocepheus mahunkarum J. Balogh et P. Balogh 2002 Sri Lanka Mahunka, 1973
Otocepheus (Acrotocepheus) besucheti (Mahunka 1973) Sri Lanka Mahunka, 1973
Otocepheus (Acrotocepheus) bucephalus (Balogh 1970) Sri Lanka Balogh, 1970
Otocepheus (Acrotocepheus) consimilis (Balogh 1970) Sri Lanka Balogh, 1970
Otocepheus (Acrotocepheus) grandis (Mahunka 1973) Sri Lanka Mahunka, 1973
Otocepheus (Acrotocepheus) loebli (Mahunka 1973) Sri Lanka Mahunka, 1973
Carabodidae      
Aokiella rotunda Hammer 1979 Oriental region Balogh, 1988  
Austrocarabodes agalawatta Balogh 1988 Sri Lanka Balogh, 1988
Austrocarabodes bellicosus Balogh 1988 Sri Lanka Balogh, 1988
Austrocarabodes bituberculatus Aoki 2006 Japan, Philippines New record +
Austrocarabodes sphaerula Balogh 1970 Sri Lanka Balogh, 1970
Carabodes (Klapperiches) globiger Balogh 1970 Sri Lanka  
Ceylobodes capillatus (Balogh 1970) Sri Lanka Balogh, 1970
Ceylobodes hettigei (Balogh 1970) Sri Lanka Balogh, 1970
Machadocepheus taprobanicus Balogh 1970 Sri Lanka Balogh, 1970
Yoshiobodes irmayi (Balogh et Mahunka 1969) Neotropical and Oriental regions, southern U.S.A. New record +
Yoshiobodes plumosulus (Balogh 1970) Sri Lanka Balogh, 1970
Yoshiobodes plumosus (Balogh 1970) Sri Lanka Balogh, 1970
Tectocepheidae*      
Tectocepheus minor Berlese 1903** Semicosmopolitan New record +
Tegeocranellidae      
Tegeocranellus laevis (Berlese 1905) Mediterranean, Oriental region, Fiji Balogh, 1988
Microtegeidae      
Microtegeus ceylonicus Balogh 1970 Sri Lanka Balogh, 1970
Microtegeus cornutus Balogh 1970 Oriental region Balogh, 1970 +
Microtegeus quadrisetosus Balogh et Mahunka 1977 Neotropical region, Sri Lanka, Congo Balogh, 1988
Cymbaeremaeidae      
Scapheremaeus cyclops (Oudemans 1915) Sri Lanka Oudemans, 1915
Scapheremaeus fisheri Aoki 1966 Australian and Oriental regions New record +
Micreremidae      
Micreremus granulatus Balogh 1970 Sri Lanka Balogh, 1970
Lamellareidae      
Tenuelamellarea taprobanae (Oudemans 1915) Sri Lanka Oudemans, 1915
Eremaeozetidae      
Seteremaeozetes obtectus (Balogh 1988) Sri Lanka Balogh, 1988
Idiozetidae*      
Idiozetes javensis Hammer 1979** Oriental region New record +
Microzetidae      
Berlesezetes ornatissimus (Berlese 1913)** Cosmopolitan New record +
Rhopalozetes canagaratnami Balogh 1970 Sri Lanka Balogh, 1970
Rhopalozetes panabokkei Balogh 1970 Sri Lanka Balogh, 1970
Tegoribatidae      
Plakoribates confluens Balogh 1970 Sri Lanka Balogh, 1970
Punctoribatidae      
Allozetes pusillus (Berlese 1913)** Oriental region, Peru New record +
Lamellobates molecula (Berlese 1916)** Tropical and Subtropical regions New record +
Paralamellobates misella (Berlese 1910) Tropical and Subtropical regions Oudemans, 1915
Caloppiidae      
Brassiella neonominata Subías 2004 Oriental region, New Guinea Oudemans, 1915  
Mochlozetidae*      
Unguizetes asiaticus Ermilov et Anichkin 2012** Vietnam New record +
Scheloribatidae      
Poroscheloribates incertus (Balogh 1970) Oriental region Balogh, 1970
Scheloribates indicus (Oudemans 1915) Oriental region, Pacific islands Oudemans, 1915
Scheloribates praeincisus (Berlese 1910) Tropical and Subtropical regions Oudemans, 1915 +
Topobates multisetosus (Balogh 1970) Sri Lanka Balogh, 1970 +
Tuberemaeus similis (Balogh 1970) Sri Lanka Balogh, 1970
Oripodidae      
Brachyoripoda foveolata Balogh 1970 Oriental region Balogh, 1970
Oripoda canagaratnami (Balogh 1970) Sri Lanka Balogh, 1970
Oripoda parajosephineae Ermilov, Khaustov et Joharchi 2019 Sri Lanka New record +
Protoripoda elongata (Oudemans 1915) Sri Lanka Oudemans, 1915
Protoripoda insularis Balogh 1970 Sri Lanka Balogh, 1970
Truncopes sinaraja Mahunka 2001 Sri Lanka Mahunka, 2001 +
Haplozetidae      
Cribrozetes multiareolatus Balogh 1970 Oriental region Balogh, 1970
Indoribates punctulatus (Sellnick 1925) Oriental region Balogh, 1970  
Magyaria pulcherrima Balogh 1970 Sri Lanka Balogh, 1970
Protoribates duoseta (Hammer 1979)** Oriental region, Vanuatu New record +
Protoribates paracapucinus (Mahunka 1988) Semicosmopolitan New record +
Protoribates lankaensis Ermilov, Khaustov et Joharchi 2019 Sri Lanka New record +
Rostrozetes florens Balogh 1970 Sri Lanka Balogh, 1970 +
Vilhenabates simplex Balogh 1970 Sri Lanka Balogh, 1970
Parakalummidae      
Neoribates oceanicus (Oudemans 1915) Sri Lanka Oudemans, 1915
Galumnidae      
Flagellozetes porosus Balogh 1970 Sri Lanka Balogh, 1970
Galumna colossus Oudemans 1915 Sri Lanka Oudemans, 1915
Galumna flabellifera Hammer 1958 Tropical and Subtropical region New record +
Galumna granalata Aoki 1984 Oriental region New record +
Galumna paratetraporosa sp. n. Sri Lanka New record +
Pergalumna bimaculata Hammer 1973 Oriental region, Tonga New record +
Pergalumna taprobanica Balogh 1988 Oriental region Balogh, 1988
Trichogalumna nipponica (Aoki 1966)** Semicosmopolitan New record +

The unidentified taxa are not included. Distribution: mostly from Subías (2004, updated 2018). Column “PD” designates primary data collected by the authors during the expedition to Sri Lanka (the plus sign marks the finding of a species). Single asterisk (*) marks the first record of a family in Sri Lanka; double asterisk (**) marks the first record of a genus in Sri Lanka.

From all the Sri Lanka oribatid mites, 69 species (48%) were recorded only on this country (potential endemics); 10 species (7%) are distributed across the Oriental region; while 65 species (45%) have a wider geographical distribution. The latter category includes 14 (semi)cosmopolitan species.

SYSTEMATICS

Family Galumnidae

Genus Galumna Heyden 1826

Type species Notaspis alatus Hermann 1804

Galumna paratetraporosa Ermilov, Khaustov et Joharchi sp. n. (Figs 1–3)

Fig. 1.

Galumna paratetraporosa sp. n., adult: a – dorsal view (legs and part of left pteromorph not shown); b – anterior part of body, lateral view (gnathosoma, pteromorph and legs not shown); c – posterior part of body, lateral view. Scale bar 100 µm.

Fig. 2.

Galumna paratetraporosa sp. n., adult: a – ventral view (gnathosoma, legs and part of right pteromorph not shown); b – posterior view (right half not shown); c – subcapitulum, ventral view (left half not shown). Scale bar (µm): a, b – 100; c – 50.

Fig. 3.

Galumna paratetraporosa sp. n., adult: a – leg I, without trochanter, right, antiaxial view; b – femur and genu of leg II, right, antiaxial view; c – trochanter, femur and genu of leg III, left, antiaxial view; d – leg IV, left, antiaxial view. Scale bar 50 µm.

Material. Holotype (♂) and 2 paratypes (1♀, 1♂): see “Material and methods” section for explanations.

The holotype (in ethanol with drop of glycerol) is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; 2 paratypes (in ethanol with drop of glycerol) are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Diagnosis. Body size: 531–564 × 415–431. Basal part of prodorsum, humeral regions of notogaster and lateral parts of epimeres I and II striate. Rostrum triangular, almost pointed. Lamellar and sublamellar lines slightly divergent distally. Rostral and lamellar setae of medium size, setiform, roughened. Interlamellar setae minute. Bothridial setae long, clavate, barbed. Dorsosejugal suture present. Notogaster with five pairs of rounded porose areas, Aa represented by two parts. Median pore present. Epimeral setal formula: 1–0–1–2. Circumpedal carinae directed to insertions of setal alveoli 3b. Anogenital setae short, setiform, smooth. Aggenital setae equal distanced from genital and anal apertures. Postanal porose area rounded, present in female, absent in males. Leg famulus on tarsi I inserted between seta ft '' and solenidion ω2. Leg solenidion on tibiae IV inserted in anterior part of the segment.

Description. Measurements. Body length: 564 (holotype), 531, 547 (paratypes); notogaster width: 415 (holotype), 415, 431 (paratypes).

Integument. Body color light brown to brown. Body surface (including subcapitular mentum and genital and anal plates) microgranulate (diameter of granules less than 1), slightly visible under high magnification; lateral parts of prodorsum (between bothridia and acetabula I–III with larger (up to 2) and distinct granules. Basal part of prodorsum, humeral regions of notogaster and lateral parts of epimeres I and II striate.

Prodorsum (Figs 1a, 1b). Rostrum triangular, almost pointed, but without clear point or tooth. Lamellar and sublamellar lines thin, parallel mediobasally and slightly divergent distally, L directed to lateral sides of prodorsum, S curving backwards at ventral ends. Prodorsal leg niches and lateral ridges of prodorsum well-developed. Rostral and lamellar setae of medium size (24–28), setiform, roughened. Interlamellar setae very short (1), hardly visible, thin, smooth. Bothridial setae (94–98) clavate, with long, smooth stalk and short, barbed head. Exobothridial setae represented by alveoli. Sejugal porose areas (8) rounded, located posterior to insertions of interlamellar setae. Dorsophragmata long.

Notogaster (Figs 1a–1c, 2b). Dorsosejugal suture present, slightly developed. With 10 pairs of setal alveoli and five pairs of rounded porose areas (Aal, 4–6; Aam, 4–6; A1, 12–16; A2, 8–12; A3, 10–16) rounded. Areas Aa represented by two parts, located anterior to setal alveoli la, close to pteromorphal hinges; areas A1 and A2 located very close to each other. Median pore present, located posterior to virtual line connected areas A2. Opisthonotal gland openings and all lyrifissures distinct, im and gla located close and anterolateral to A1, ip between p2 and A3, ih and ips close to each other, anteromedial or medial to p3. Circumgastric sigillar indistinctly developed.

Gnathosoma (Fig. 2c). Subcapitulum size: 131–135 × × 118–123. Subcapitular setae setiform, roughened, a (20–24) longer and thicker than m and h (12–16). Adoral setae (12–16) setiform, heavily barbed. Length of palps: 94–102. Postpalpal setae (6) spiniform, smooth. Axillary saccules poorly visible. Length of chelicerae: 180–184. Cheliceral setae setiform, barbed, cha (57–61) longer than chb (32–36). Trägårdh’s organ of chelicerae long, elongate triangular.

Epimeral and lateral podosomal regions (Figs 1b, 2a). Anterior tectum of epimere I smooth. Pedotecta I and II rounded in ventral view. Discidia triangular. Epimeral setal formula: 1–0–1–2. Epimeral setae setiform, smooth, 1b and 3b (20–24) longer than 4a and 4b (12–16). Circumpedal carinae of medium size, thin, directed to insertions of setal alveoli 3b, but not reaching them.

Anogenital region (Figs 1b, 1c, 2a, 2b). Six pairs of genital (g1, g2, 12–16; others 8), one pair of aggenital (8), two pairs of anal (8) and three pairs of adanal (8) setae setiform, smooth. Anterior edge of genital plates with three setae. Aggenital setae located between genital and anal apertures, equal distanced from them. Adanal setae ad1 posterior, ad2 posterolateral, ad3 lateral to anal aperture. Distance ad1ad2 equal to ad2ad3. Adanal lyrifissures located close and parallel to anal plates. Postanal porose area rounded (8) present only in female, absent in males.

Legs (Figs 3a–3d). Median claw slightly thicker than laterals, all slightly barbed on dorsal side. Dorsoantiaxial porose areas on all femora and dorsoparaxial porose areas on trochanters III and IV well visible. Formulas of leg setation and solenidia: I (1–4–3–4–20) [1–2–2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homologies of setae and solenidia indicated in Table 2. Famulus on tarsi I inserted between seta ft '' and solenidion ω2. Solenidion on tibiae IV inserted in anterior part of the segment.

Table 2.  

Leg setation and solenidia of adult Galumna paratetraporosa sp. n.

Leg Tr Fe Ge Ti Ta
   I v' d, (l), bv " (l), v ', σ (l), (v), φ1, φ2 (ft), (tc), (it), (p), (u), (a), s, (pv), v ', (pl), l ", ɛ, ω1, ω2
  II v' d, (l), bv " (l), v ', σ (l), (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III v' d, ev ' l ', σ l ', (v), φ (ft), (tc), (it), (p), (u), (a), s, (pv)
IV v' d, ev ' d, l ' l ', (v), φ ft ", (tc), (p), (u), (a), s, (pv)

Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (') marks setae on the anterior and double prime ('') setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae.

Remarks. Galumna paratetraporosa sp. n. is morphologically most similar to Galumna tetraporosa Ermilov, Martens et Tolstikov 2014 (see Ermilov et al., 2014) from Nepal in having the following features: clavate bothridial setae, five pairs of rounded notogastral porose areas (Aa represented by two parts), rostral and lamellar setae of medium size, lamellar and sublamellar lines divergent distally. The new species differs from G. tetraporosa in its smaller body size (531–564 × × 415–431 versus 913–979 × 730–763); the presence (versus absence) of a median pore and a sejugal suture; the absence of a well-developed rostral point (versus rostrum having a distinct point, which forms a tooth). Also, the aggenital setae in G. paratetraporosa sp. n. is equally-distanced from the genital and the anal apertures (versus aggenital setae being located clearly closer to the genital aperture in G. tetraporosa).

Etymology. The specific name paratetraporosa refers to the similarity between the new species and Galumna tetraporosa Ermilov, Martens et Tolstikov 2014.

Список литературы

  1. Balogh J., 1970. New oribatids (Acari) from Ceylon. The Scientific Results of the Hungarian Soil Zoological Expedition // Opuscula Zoologica Budapest. V. 10. № 1. P. 33–67.

  2. Balogh P., 1988. Oribatid mites (Acari) from Sri Lanka // Acta Zoologica Hungarica. V. 34. № 2–3. P. 171–189.

  3. Ermilov S.G., Klimov P.B., 2017. Generic revision of the large-winged mite superfamily Galumnoidea (Acari, Oribatida) of the world // Zootaxa. V. 4357. № 1. P. 1–72.

  4. Ermilov S.G., Starý J., 2017. New data on oribatid mites of Galumna (Galumna) (Acari, Oribatida, Galumnidae) from Northern Vietnam, with key to species of this subgenus in the Oriental region // Systematic and Applied Acarology. V. 22. № 4. P. 550–571.

  5. Ermilov S.G., Alvarado-Rodríguez O., Retana-Salazar A.P., 2015. Two new species of oribatid mites (Acari, Oribatida) with auriculate pteromorphs from Costa Rica, including a key to all species of Galumna (Galumna) of the Neotropical region // Systematic and Applied Acarology. V. 20. № 3. P. 273–285.

  6. Ermilov S.G., Hugo-Coetzee E.A., Theron P.D., 2018. To the knowledge of oribatid mites of the subgenus Galumna (Galumna) Heyden 1826 (Acari, Oribatida, Galumnidae) in South Africa, with a key to species known from the Ethiopian region // Zoologichesky Zhurnal. V. 97. № 5. P. 515–527.

  7. Ermilov S.G., Martens J., Tolstikov A.V., 2014. The genus Galumna in Nepalese oribatid mite fauna, with notes on systematic placement of some species (Acari, Oribatida, Galumnidae) // ZooKeys. № 438. P. 33–44.

  8. Mahunka S., 1973. Neue und interessante Milben aus dem Genfer Museum IX. Otocepheid species from Ceylon (Oribatida) // Redia. V. 54. P. 83–103.

  9. Mahunka S., 2001. A new Truncopes Grandjean, 1956 species from Sri Lanka (Acari: Oribatida) // Folia Entomologica Hungarica. V. 62. P. 5–9.

  10. Niedbała W., 1991. Phthiracaroidea (Acari, Oribatida) de la région orientale. II // Acta Zoologica Hungarica. V. 37. № 3–4. P. 211–216.

  11. Niedbała W., 2000. The ptyctimous mites fauna of the Oriental and Australian regions and their centers of origin (Acari: Oribatida) // Genus. Supplement. P. 1–493.

  12. Oudemans A.C., 1915. Acarologische Aanteekeningen, LVII // Entomologische Berichten. № 4. P. 192–200.

  13. Subías L.S., 2004. Listado sistemático, sinonímico y biogeográfico de los ácaros oribátidos (Acariformes: Oribatida) del mundo (excepto fósiles) // Graellsia. V. 60 (número extraordinario). P. 3–305. Online version accessed in January 2018, 605 p.; http://bba.bioucm.es/ cont/docs/RO_1.pdf

Дополнительные материалы отсутствуют.