© Entomologica Fennica. 3 October 2012

Description of two new species of the Borner, 1901 (Collembola: Neanuridae, ) from Russia, with notes on the genus Lanzhotia Rusek, 1985

Adrian Smolis, Louis Deharveng & Anne Bedos

Smolis, A., Deharveng, L. & Bedos, A. 2012: Description oftwo new species of the genus Micranurida Borner, 1901 (Collembola: Neanuridae, Pseudacho- rutinae) from Russia, with notes on the genus Lanzhotia Rusek, 1985. — Ento- mol. Fennica 23: 149—154.

Micranurida rassica sp. n. andMicranaridapotapovi sp. n. from the Russian Far East are fully illustrated and described. Both new species belong to a small group ofMicranurida species characterized by thick globular sensilla on thorax II and abdomen IV. Remarks on Lanzhotia braclzycera Rusek, 1985 are also included.

A. Smolis Department of Evolutionary Biology and Ecology, University of Wroclaw, Przybyszewskiego 63/77, 51—148 Wroclaw, Poland; E—mail.‘ adek @biol.ani.wroc.pl L. Deharveng & A. Bedos, Museum National d ’Histoire Natarelle, UMR 7205 France, CNRS/MNHN, CP50, 45rae Baflon, 75005 Paris, France; E—mail.‘ [email protected] Received 28 April 2011, accepted I 6 Jane 2012

1. Introduction culum, and highly reduced chaetotaxy on body and appendages. Morphologically the genus In 1901 Bomer established the genus Micranu— strongly recalls the genera Anarida Laboulbéne, rida for his new species Micranurida 1865, Lanzhotia Rusek, 1985, Rasekella Dehar— pygmea from Europe. To date Micranurida in- veng, 1982 and Staclzorates Dallai, 1973. Never- cludes 25 species distributed mainly in the North- theless, an examination of the characters listed ern Hemisphere, and only M. flaminensis Fer- above allows to easily separate Micranurida from nandes & Mendonca, 2004 andM. wladimiriNajt them. & Rubio, 1978 have been described from South Two new species belonging to the genus America. Micranurida were discovered during the Collem— Most species of the genus have a body length bolan investigations in Russian Far East. Their ofonly 0.3—0.5 mm and are the smallest members descriptions and taxonomic affinities are pre- of the family Neanuridae. Micranurida species, sented below. besides their often minute size, are characterized by simple and not complicated postantennal or- gan, 0—5 (usually 0—2) eyes, simple and reduced 2. Material and methods mouthparts (mandibles rather thin with maxi- mum 5 teeth, maxilla elongate and styliform usu- Type specimens are preserved in the Museum na- ally without dentate lamellae, absence of labial tional d’Histoire naturelle in Paris, France seta L), complete reduction of furcula and retina- (MNHN) and the entomological collection of 150 Smolis et al. ° ENTOMOL. FENNICA Vol. 23

Wroclaw University, Poland (ZIWU). Terminol- setae, prelabrals 4. Mandibles and maxillae as in ogy essentially follows Smolis and SkarZynski Figs. lf and g. Dorsal chaetotaxy of head as in 2004, and the following abbreviations are used in Fig. 1a, seta a0 absent, unpaired seta (11 or even = the text: ant. I—IV antennal segments I—IV, setae (11 present, seta p1 present. Head with 2+2 AIIIO = antennal III organ, PAO= postantennal setae along ventral line (Fig. 1e). organ, th. I—III = thoracic terga I—III, abd. I—VI = Dorsal chaetotaxy of thorax and abdomen as abdominal terga I—VI. in Figs. la and i. Body setae short and fine, smooth and acuminate. Thorax I with 3+3 setae. Sensillar formula of body 022/l l l l 1. Lateral 3. sensilla on th. II and abd. IV globular (Figs. la, i), other sensilla slender, thin and longer than nearby 3.1. ofMicranurida russica setae. Setae m on th. II—III Description ordinary 4 present. n. Setae and a on th. II—III or sp. (Fig. 1) a3 4 present a3 sporadi- cally and asymmetrically absent, setae a2 absent. Material examined. Holotype: female on slide: Setae p2 present on th. II—abd. IV, in forward po- Russia, Primorskyi Kray, Khasan Area, Barabash sition. Setae a3 on abd. I—III present, setae p3 on [43°11’ N 131°29’E], deciduous forest near old abd. IV and setae a1 on abd. V present. Thoracic quarry, soil and litter, 27.IX.2004, leg. Romuald stema without setae, ventral tube with 4+4 setae. Jacek Pomorski, ZIWU. Paratype: juvenile on Unpaired seta absent on abd. II sternum, present slide, same data as holotype, MNHN. Other ma- on abd. III. Six microsetae on furcula rudimen- terial: 3 females and 1 juvenile, MNHN and tary (Fig. 1d). ZIWU. Leg chaetotaxy from I to III as follows: Diagnosis. The species is well differentiated tibiotarsi with l7, l7, l6 (seta M present, setae A3 fusion of sensilla A and B on ant. and A and without clavate tenent by: IV, slightly 6 absent) hairs; curved ventral guard sensillum in AIIIO, 1+1 femora I, II, III with 12, l l, 10. Trochanters with eyes, oval PAO, globular sensilla on th. II and 5 each. Coxae I, II, III with 3, 6, 6; subcoxae I, II, abd. IV, presence of setae p2 on abd. I—IV and III with l, 2, 2. Claws with neither inner nor lat- tibiotarsal formula: l7, l7, 16. eral teeth. Empodial appendage absent. Description. Habitus typical of the genus Etymology. Named after its terra typica, Rus- (Fig. la). Body length (without antennae) 0.32— s1a. 0.44 mm (holotype: 0.36 mm). Colour of the Discussion. The morphological characters of body white. Granulation rather coarse, with areas white body, thick lateral sensilla on th. II and abd. of larger granules as in Fig. li. IV, ventral guard sensillum of ant. III slightly Antennae slightly shorter than head (Fig. 1). curved, fusion of antennal sensilla A and B place Ant. I with 7 setae, Ant. II with 11 setae. Dorsal Micranurida russica sp. 11. near M. bescidica and ventral chaetotaxy of ant. III—IV as in Figs. Smolis & SkarZynski, 2004, described from the lb and c. Ant. III and IV fused dorsally. AIIIO Carpathians (central Europe, Smolis & SkarZyn- with two small internal sensilla and two equal, cy- ski 2004). The new species differs from it in the lindrical, slightly curved guard sensilla. Ventral presence of 1+1 eyes (v. absent), presence of 9— microsensillum on ant. III present. Ant. IV with 10 vesicles in FAQ (v. 5—7), antennal sensilla C erect large simple apical vesicle, seta i, very small and D separate (v. fused), presence of seta i on subapical organite (or), microsensillum (ms) and 6 well differentiated sensilla A—F. Sensilla C, D, V 1. Micranun'da russica n. — a. Dorsal view E and F drop-like. Sensilla A and B hammer-like Fig. sp. of head, thorax and first abdominal — b. and fused segment.

together linearly. — Antennal segments Ill—IV, ventral side. c. Antennal One and on unpigmented relatively large eye — segments Ill—IV, dorsal side. d. Abdomen, ventral setae oc each side of head 3+3 — — — present. present. view. e. Labium and setae Vi. f. Mandible. g.

Postantennal of 9—10 sim- — — organ oval, consisting Maxilla. h. Postantennal organ and ocular area. i. ple vesicles (Fig. 1h). Buccal cone short, labium Chaetotaxy and granulation of abdominal terga lll—Vl. as in Fig. 1e, without papillae. Labrum with 4, 3, 4 Scale bars 0.01 mm. ENTOMOL. FENNICA V01. 23 ° A new Palaearctic Species ofMicranurida 151

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w ENTOMOL. FENNICA Vol. 23 ° A new Palaearctic species ofMicranurida 153 ant. IV (V. absence), presence of setae p2 on abd. 2a, seta a0, eVen setae (11 and setae p1 present. I—IV (V. absence) and presence of 17, 17, 16 setae Head with 2+2 setae along Ventral line. on tibiotarsi I—III (V. 14, 14, 14). Dorsal chaetotaxy of thorax and abdomen as in Fig. 2a. Body setae short and fine, smooth and acuminate. Thorax I with 3+3 setae. Sensillar for- 3.2. Description ofMicranuridapotapovi mula ofbody 022/1 1 1 1 1. Lateral sensilla on th. II sp. n. (Fig. 2) and abd. IV globular (Fig. 2a), other sensilla slen- der, thin and slightly longer than nearby ordinary Material examined. female on slide: setae. On th. II—III setae m and and a Holotype: 4 a2 absent, a3 4 Russia, Primorskyi Kray, Partizansk Region, present. Setae p2 present on th. II—abd. IV. Setae ’ EkaterinOVka [42°55 N 133°02’E], Chandalaz a3 on abd. I—III and a1 on abd. V present, setae p3 Range, forest soil, Berlese extraction, 26.IX. on abd. IV absent. Thoracic stema without setae, 2004, leg. Louis Deharveng & Anne Bedos (Ru- Ventral tube with 4+4 setae. Unpaired seta absent 103), MNHN. on abd. II sternum, present on abd. III. Six Diagnosis. The species is easily recognizable microsetae on furcula rudimentary (Fig. 2j). due to: 6 drop-like sensilla A—F on ant. IV, Leg setation (Fig. 2h and i) from I to III as fol- strongly S—shaped Ventral guard sensillum in lows: tibiotarsi with 12, 12, 11 and without AIIIO, absence of eyes, elliptical PAO, the pres- claVate tenent hairs (all setae T absent; setae A3, ence of setae a3 on abd. I—III, setae p2 on abd. IV A6 and M absent); femora I, II, III with 9—10, 1 1, and tibiotarsal formula: 12, 12, 11. 10. Trochanters with 5 each. Coxae I, II, III with Description. Habitus typical of the genus 3, 7, 7; subcoxae III with 1, 2, 2. Claws with nei- (Fig. 2a). Body length ofholotype: 0.41 mm. Col- ther inner nor lateral teeth. Empodial appendage our of the body white. Granulation fine and ho- absent. mogenous. Etymology. The new species is dedicated to Antennae slightly shorter than head (Fig. 2a). Mikhail PotapOV, an excellent Russian collembo- Chaetotaxy ofantennae as in Figs. 2c and (1. Ant. I logist and our friend. with 7 setae, Ant. II with 11 setae. Ant. III and IV Discussion. Though only one specimen has fused dorsally. AIIIO with two small internal been collected, the new species is well character- sensilla, strongly S-shaped Ventral guard ized, its chaetotaxy is perfectly symmetrical, and sensillum (sgV) and slightly curved dorsal guard it is an adult: we therefore decided to describe it. sensillum (sgd). Ventral microsensillum on ant. Micranuridapotapovi sp. n. is most similar to M. III present. Ant. IV with erect large simple apical sensillata (Gisin, 1953) (west European species) Vesicle, seta i, Very small subapical organite (or), in strongly S—shaped Ventral guard sensillum of microsensillum (ms) and 6 well differentiated AIIIO, elliptical PAO, fine and uniform granula- drop-like sensilla A—F. tion of body, ant. IV with seta i, similar chaeto- absent. 3+3 setae oc PAO 0Val of th. II—III m and identical Eyes present. taxy (setae 4 absent) consisting of 11 simple Vesicles (Fig. 2b). Buccal number and arrangement of tibiotarsal setae cone short and wide, labium as in Fig. 2g, without (tibiotarsi I, II, III with 12, 12, 11 setae respec- papillae. Labrum with 4, 4 setae, prelabrals 4. tiVely). NeVertheless, they can be easily distin- Mandibles and maxillae as in Figs. 2e and f, rela- guished by the following characters: number of tiVely strong. Dorsal chaetotaxy ofhead as in Fig. sensilla on ant. IV (in M. potapovi 6 V. in M. sensillata 5), localization of two small sensilla in AIIIO (in M potapovi both between guard 4 Fig. 2. Micranurida potapovi sp. n. — a. Habitus and sensilla V. in M sensillata one between guard dorsal — b. Postantennal — c. An- chaetotaxy. organ. sensilla and second of

— — outside), presence/absence tenna, ventral side. d. Antenna, dorsal side. e. seta on head M V. in M — — — (in potapovi present Mandible. f. Maxilla. g. Labium and labrum. h. aO sensillata and dorsal of abdo- Chaetotaxy of coxa, trochanter, femur and tibiotarsus, absent) chaetotaxy

— men M setae on abd. I—III and dorsolateral view. i. Chaetotaxy of coxa, trochanter, (in poiapovi a2 femur and tibiotarsus, ventrolateral view. —j. Abdomi- setae p2 on abd. IV present V. in M sensillata nal segments ll—Vl, ventral view. Scale bars 0.01 mm. mentioned setae absent). 154 Smolis et al. ° ENTOMOL. FENNICA Vol. 23

4. Notes on the genus (in balta 4/3,2,4 V. in brachycem 2/2,4,4), in the Lanzhotia Rusek, 1985 number of mandibular teeth (in balta 3—4 V. in brachycera 2), in the presence/absence of bosses Arrangement, number and shape of sensilla on in furcal area (in balta absent V. in brachycera third and fourth antennal segments are some of present), and in the number of setae on Ventral the best diagnostic characters in the taxonomy of tube (in balta 4+4 V. in brachycera 3+3). In the Micranurida. Morphological modifications and light of these observations we state that the taxo- presence/absence of some antennal structures are nomical status of Lanzhotia brachycera is un- common within the genus, connected probably clear, and undoubtedly it needs verification and with minute size of most members and their further studies on the basis ofthe type material of deeply edaphic lifestyle. Among Micranurida the species. The investigation should explain and species, M. balta Fjellberg, 1998 (reported from resolve the question ofthe possible synonymy of Europe: Sweden, Denmark and Poland) is easily the mentioned genus with Micranurida. recognized by its 10 dagger-like sensilla (see Smolis & SkarZyr'iski 2005: Figs. 4—6). The same Acknowledgments. We are greatly indebted to anonymous reviewers for their valuable and helpfiil comments. conspicuous condition is known by us only in Lanzhotia brachycera Rusek, 1985 (see Rusek 1985: Figs. 2A, B), a member of the monotypic References genus described from Czech Republic. A detailed study ofthe original description ofL. brachycera Borner, C. 1901: Neue Collembolenformen und zur No— and materials of M. balta (including types) menclatur der Collembola Lubb. 7 Zoologisher An— zeiger 24: 6967712. showed that both taxa have many other similari- Rusek, J. 1985: Lanzhothia brachycera gen. n., sp.n. from ties: absence of sensillum B on eyes, 7 elongated Central Europe (Collembola, Pseudachorutidae). ant. IV, rounded PAO, lanceolate and slightly Acta entomologica bohemoslovaca 82: 1757179. thickened lateral sensilla on th. II and abd. IV, ab- Smolis, A. & SkarZynski, D. 2004: A new species of the Micranurida 1901 from Poland sence of setae p2 on abd. I—IV; but also important genus Borner, (Col— lembola: 7 Genus 15 175. differences in the number of vesicles in PAO (in Neanuridae). (1): Smolis, A. & SkarZynski, D. 2005: Notes on Micranurida balta 7—9 V. in brachycera 6—7), in the pres- balta Fjellberg, 1998 (Collembola: Neanuridae), a ence/absence of balta absent V. in 7 cryptopygy (in springtail species new for the Polish fauna. Polskie brachycera present), in the chaetotaxy of labrum Pismo Entomologiczne 74: 57760.