Leenurina pomorskii, Deharveng, Louis, Bedos, Anne & Weiner, Wanda Maria, 2011

Deharveng, Louis, Bedos, Anne & Weiner, Wanda Maria, 2011, Two new species of the genus Leenurina Najt & Weiner, 1992 (Collembola, Neanuridae, Caputanurininae) from Primorskij Kraj (Russia), ZooKeys 115, pp. 39-52 : 43-47

Leenurina pomorskii sp. n. Figs 2 A–B3A–F 456E, F, ITable 2

Type localities.

Russia: Primorskij Kraj, Khasan Region, Pos’et Bay, Point Mramornyj (42° 34' 16" N, 130° 47' 27" E), litter in mixed deciduous forest, Berlese funnel extraction, 28.IX.04, 5 specimens, L. Deharveng and A. Bedos leg. (sample RU-120).Russia: Primorskij Kraj, Khasan Region, ~ 5 km E of Mayachnoye, Gora Chertova Gorka (42° 37' 02" N, 130° 42' 31" E), in mixed deciduous forest, Berlese funnel extraction, 28.IX.04, 3 specimens, R. J. Pomorski leg. (sample 3a).

Type material.

Holotype: female adult on slide (RU-120/2) in MNHN. Paratypes: "one female juvenile on slide (RU-120/1) in MNHN; one female juvenile (RU-120/3) and one juvenile (RU-120/4, skin obtained after DNA extraction for barcoding) on slide in ISEA; one female juvenile (3a/1) and one juvenile (3a/3) on slides in DBET; one female (RU-120/5) and one juvenile (3a/2) on slides in MSPU.

Etymology.

The new species is dedicated to Professor R. Jacek Pomorski, the eminent taxonomist of Collembola and our friend, who left us in 2010.

Description.

Holotype: 0.92 mm (female adult); paratypes: 0.84 mm (female), 0.6-0.9 mm (female juvenile), 0.58 mm (juvenile). Habitus typical for the genus Leenurina . Abdominal tergum VI small, sometimes hidden under V (Fig. 2A). Color in alcohol white with 3+3 blue-black ocelli. Integument very strongly granulated dorsally, with tertiary granulation arranged in large smooth plates fringed with lines of strong secondary granules (Figs 2A, B, 6E, F, I). Well marked underlying small hexagonal reticulations (Fig. 5), each reticulation mesh connected with two or three secondary granules. Secondary granules rounded, the lateral ones very large. Two parallel lines of secondary granules along the axis from posterior part of head to abdominal tergum IV. Thoracic tergum I fused with head, sternum normal.

Antennae shorter than head. Antennal segment I with 7 chaetae, antennal segment II with 12 chaetae. Sensory organ on antennal segment III consisting of two small sensilla bent in the same direction, two almost equal, subcylindrical guard sensilla and a small ventral microsensillum. Antennal segment IV with 6 thick subcylindrical sensilla, a microsensillum, a subapical organite and a very slightly bilobed apical vesicle (Figs 3A, B).

Three ocelli per side, slightly bigger than surrounding integument granulation, indicated by blue-black pigment patches, but not distinct from surrounding secondary granules under microscopic examination. Postantennal organ oval, 2-3 times longer and about 1.5-2 times broader than ocellus A, with 10-12 vesicles (Figs 3D, 4). Buccal cone typical for the genus. Labrum truncated, 1-2 prelabral chaetae, labral chaetotaxy uncertain, probably:?2,3,5,2. Labium short, with 4 basal (E, F, G, f), 3 distal (A, C, D) and 3 lateral (c, d, e) chaetae; papillated chaeta L absent; 2+2 small hyaline vesicles arranged one above the other between chaetae A and C (x papillae of Deharveng 1983) (Fig. 3C). Mandible with three small apical teeth and two strong basal ones. Maxilla with two lamellae (each with two apical teeth) and capitulum denticulate with minute teeth like Leenurina khualaza .

Dorsal chaetotaxy as on Fig. 2, with short thin pointed ordinary chaetae and long thin s-chaetae, 3-5 times longer than ordinary chaetae. Some asymmetry observed. Ocular area with 3 (or 4 chaetae, probably as a result of a shift of a dorsal cephalic chaeta towards ocular area). One lateral chaeta on what could be the poorly individualized lateral part of thoracic tergum I (Fig. 2B), and another ventro-lateral chaeta on subcoxa 1. Dorso-lateral chaetae of thoracic terga II and III in one group (p6 close to s-chaeta, Fig. 2B). Formula of s-chaetae per half tergum: 022/11111; s-microchaeta present on thoracic tergum II, close and anterior to the lateral s-chaeta; s-chaetae slighly thicker and shorter on abdominal tergum IV than on other terga. From thoracic tergum II to abdominal tergum III, 3 chaetae present between the axis and the proximal s-chaeta: a1, p1 and a chaeta in a “p2” position on thoracic tergum II-III and usually a “p3” position abdominal terga I-III. Abdominal tergum IV with only 2+2 chaetae between the axis and the proximal s-chaeta (a1, p1). Some specimens slightly depart from this pattern on details: one specimen with 4 chaetae present between the axis and the proximal s-chaeta on abdominal tergum I (a1, p1 and 2 other chaetae in row p); one specimen with 2 chaetae present between the axis and the proximal s-chaeta on abdominal tergum I (a1 and p1); one specimen with an additional chaeta antero-internal and close to the s-chaeta on abdominal tergum IV.

Thoracic sterna without chaetae. Chaetotaxy of abdominal sterna I–VI as in Fig. 3F. Anal valves with three hr-chaetae each.

Tibiotarsi I, II and III with 19, 19 and 18 chaetae (chaeta M present). Femora I, II and III with 13, 12 and 11 chaetae, trochantera I, II and III with 6, 6 and 5-6 chaetae, coxae I, II and III with 3, 6 and 7 chaetae, subcoxae 2 of legs I, II and III with 0, 2 and 2 chaetae, subcoxae 1 of legs I, II and III with 1, 2 and 2 chaetae. Praetarsi with 1+1 strong chaetae. Claw short and thick, toothless (Fig. 3E).

Ventral tube with 4+4 chaetae, without chaetae at its basis. Furca reduced to two small swellings, each with one chaeta (Fig. 3F).

Discussion.

Dorsal chaetotaxy of both described species exhibits some variability and frequent asymmetries. The four species of Leenurina are closely related, but easily distinguished on a combination of characters including eye number, pigmentation, leg and dorsal chaetotaxy (Table 2).