Protaphorura oligopseudocellata, Kaprus', Igor, Weiner, Wanda & Pasnik, Grzegorz, 2016

Kaprus', Igor, Weiner, Wanda & Pasnik, Grzegorz, 2016, Collembola of the genus Protaphorura Absolon, 1901 (Onychiuridae) in the Eastern Palearctic: morphology, distribution, identification key, ZooKeys 620, pp. 119-150 : 124-128

Taxon classification Animalia Collembola Onychiuridae

Protaphorura oligopseudocellata sp. n. Figs 26-32, 58

Type material.

Holotype (female): Russia, Siberia, Western Sayan, Oiskii Mt. Range, vicinity of weather station Olenya Rechka, mountain tundra with Betula rotundifolia , Salix sp, Sphagnum sp., 1800 m alt., in moss and soil, 52°48'N, 93°13'E, 27.VI.1990, leg. S.K. Stebaeva (SNHM). Paratypes: 3 females and juvenile, same data as holotype (ISEA - 1 paratype, MSPU - 1 paratype and juvenile).

Diagnosis.

PAO with 32-34 simple vesicles. Pso formula dorsally 32/011/22232, ventrally 1/000/0000, subcoxae 1 of I–III legs without pso. Psx formula on Abd. sterna: 111000. Th. tergum I with 23 –25+23– 25 chaetae, one, two or three chaetae m present. Chaetae s' present on Abd. terga I–III and absent or present on Abd. tergum V. Manubrial field with 12-13 chaetae in three rows. Claw with pair of lateral denticles.

Description.

Holotype (female) length 2.2 mm, length of paratypes: 2.0-2.3 mm (females). Shape of body typical of the genus: cylindrical with strong AS on distinct pa pillae (Fig. 26). Colour in alcohol yellowish-white. Granulation more or less uniform, distinct. Usually 7-10 grains around each pso.

Antennae as long as the head, their base well marked. Ant. I with 11-12 chaetae, Ant. II with 18 chaetae. AIIIO consisting of 5 guard chaetae, 5 papillae, 2 smooth sensory rods, 2 straight and granulated sensory clubs, ventro-lateral microsensillum present (Fig. 28). Ant. IV with subapical organite in unprotected cavity without clear cuticular papilla. Microsensillum on Ant. IV in usual position above second proximal row of chaetae. Ventrally Ant. IV with numerous chaetae (ca. 74-78). Sensilla indistinct on antennal segment IV (Fig. 28).

PAO relatively small, consisting of 32-34 simple vesicles (Fig. 27). Labral formula of chaetae: 4/342. Maxillary outer lobe with simple palp, basal chaeta and with two sublobal hairs. Labial palp of type A. Labium with 7 proximal, 4 basomedian (E, F, G, and f), and 6 basolateral chaetae (a, b, c, d, e, e’). Papillae A-E with 1, 4, 0, 3, 3 guard chaetae respectively.

Pso formula dorsally 32/011/22232, ventrally 1/000/0000 (Figs 26, 31, 32). Subcoxae 1 of I–III legs without pso and with one psx each. Psx formula 1/000/111000. Th. terga II and III with 1+1, 1+1 psx in lateral position (Fig. 26). Psp formula dorsally 0/011/1111, ventrally 0/111/01m1m1m, coxae with 1 psp.

Dorsal chaetotaxy plurichaetotic, usually with some asymmetry, all dorsal chaetae rather short (except macrochaetae), well differentiated into macro- meso- and microchaetae, as in Fig. 26. Sensory chaetae s indistinct on body. On head p2 chaetae are displaced forward in relation to p1 and p3. Chaetae p6 on head located anterior to pseudocelli b (Fig. 26). Th. tergum I with 23 –25+23– 25 chaetae, 1-3 chaetae m and 1-2 chaetae i present (chaetotaxy type i(1 –2)3–4m(1– 3)). Both Th. terga II and III with lateral microsensilla and with 6+6 or 7+7 axial microchaetae. Chaetae s' present on Abd. terga I–III and absent or present on Abd. tergum V (Fig. 26). On Abd. tergum IV in axial area between M2 and P2 macrochaetae located 23-24 chaetae, medial chaetae p0 and m0 present (sometimes these chaetae absent). Abd. tergum V with one unpaired microchaeta p0 (Fig. 26). Abd. tergum VI with medial chaetae m0. Relative position of prespinal microchaetae of convergent type (Fig. 26). M/s ratio on Abd. tergum V as 23.5-23.9/15 (AS = 10). AS 0.7-0.8 times as long as inner edge of claw and 2.3 times longer than their basal diameter.

Chaetotaxy of ventral side of head as in Fig. 31. Perilabial area with 4 –5+4– 5 a-chaetae. Postlabial chaetae 4-5+4-5 along ventral groove. Thoracic sterna I–III with 1+1, 2 –3+2– 3, 2 –3+2– 3 chaetae respectively. VT with ca. 10+10 chaetae, and 2-3 chaetae at base. Chaetotaxy of Abd. sternum IV as in Fig. 32. Furcal rudiment: cuticular fold (located near the middle of sternum) with 2+2 dental microchaetae in 2 rows. Chaetotaxy of manubrial field: 4-5 chaetae present in ma-row, 4 chaetae in mm-row, 4 chaetae in mp-row (in adult specimens) (Fig. 32). Each lateral anal valves with a0, 2a1 and 2a2; upper anal valve with chaetae a0, 2a2, 2b1, 2b2, c0, 2c1 and 2c2 (as in Protaphorura jernika , Fig. 58).

Subcoxae 1 of I, II and III legs with 6-8, 7-8, 7-9 chaetae, subcoxae 2 with 1, 5, 5, coxae with 4, 10, 15, trochanters with 13, 15, 15, femora with 21, 23, 22-23, tibiotarsi with four rows of chaetae (distal whorl (A+T)+B+C): 11+8+3-4, 11+8+5-6, 11+8+5 chaetae respectively. Claw with strong denticle in 1/2 of inner edge of claw and pair of lateral denticles (Figs 29, 30). Empodial appendage 0.9 times as long as inner edge of claw, without basal lamella (Fig. 29).

Etymology.

The name of the new species refers to the Latin oligo (a few) and pseudocellus (false ocellus) ‒ characteristic structure in Onychiuroidea.

Discussion.

Protaphorura oligopseudocellata sp. n. is characterized by the reduced number of pso on body dorsally - 32/011/22232. Only four species with 1+1 pso on Th. tergum III is currently known: Protaphorura januarii (Weiner, 1977), Protaphorura stiriaca (Stach, 1946), Protaphorura pseudostyriaca (Loksa, 1964) and Protaphorura pseudarmata (Folsom, 1917). The first three species are described from Europe and the last one from North America. Among these species Protaphorura oligopseudocellata sp. n. is probably the most similar to Protaphorura januarii and Protaphorura stiriaca due to the absence of pso on subcoxa 1 of all legs and some similarity of dorsal pso formulae. The new species can be easily distinguished from these species by the number of pso on Abd. terga I–V (22232 in Protaphorura oligopseudocellata sp. n., 23232 in Protaphorura januarii and 33232 in Protaphorura stiriaca ), the plurichaetotic chaetotaxy and by the presence of strong lateral denticles on claws and 1+1 pso on head ventrally (lateral denticles and pso absent in Protaphorura januarii and Protaphorura stiriaca ).