Protaphorura vasilinae, 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 : 135-139

Taxon classification Animalia Collembola Onychiuridae

Protaphorura vasilinae sp. n. Figs 51-57, 59

Type material.

Holotype (female): Russia, West Siberia, 25 km S of Novosibirsk, Akademgorodok, lawn, soil, 400 m alt., 54°49'N, 83°08'E, 2.X.1994, leg. S.K. Stebaeva (SNHM). Paratypes: 7 females and 6 juveniles, same data as holotype (SNHM - 3 paratype females and 3 juveniles, ISEA - 4 paratype females and 3 juveniles); 2 females and 3 juveniles: Russia, N-E Altai, Turochak Region, meadow, soil, 11.VI.2002, leg. E. Sleptsova (SNHM).

Diagnosis.

PAO with 32-36 simple vesicles. Pso formula dorsally 32/022/33332, ventrally 2/000/0001, subcoxae 1 of I–III legs with 1,1,1 pso respectively. Submedial pso a and b on Abd. terga I–II located far apart. Psx formula on Abd. sterna: 110001m. Th. tergum I with 10 –11+10– 11 chaetae, chaeta m absent. Chaetae s' absent on Abd. terga I–III and present on Abd. tergum V. Manubrial field with 25-28 chaetae in 6 rows. Claw without lateral denticles.

Description.

Holotype (female) length 1.5 mm, length of paratypes: 1.4-1.7 mm (females). Shape of body typical of the genus: cylindrical with strong AS on distinct papillae (Fig. 51). Colour in alcohol yellowish-white. Granulation more or less uniform, distinct. Usually 10-12 grains around each pso.

Antennae slightly shorter than the head, their base well marked. Ant. I with 10 chaetae, Ant. II with 16 chaetae. AIIIO consisting of 5 guard chaetae, 5 papillae, 2 smooth sensory rods, 2 straight and granulated sensory clubs, ventro-lateral microsensillum present (Fig. 52). Ant. IV with subapical organite in unprotected cavity without clear cuticular papilla (Fig. 53). Microsensillum on antennal segment IV in usual position above second proximal row of chaetae. Ventrally Ant. IV with numerous chaetae (ca. 50-55). Ant. IV with 8-11 slightly differentiated sensilla (Fig. 53).

PAO of middle length, consisting of 32-36 simple vesicles (Fig. 54). 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 32/022/33332, ventrally 2/000/0001 (Figs 51, 56, 57). Subcoxae 1 of I– III legs with one pso and one psx each. Submedial pso a and b on Abd. terga I–II located far apart, i.e. on similar distance as on Abd. tergum III (Fig. 51). Psx present on Abd. sterna I–II and VI (psx formula 0/000/110001m). Psp formula dorsally 0/011/1111, ventrally: 0/111/01m1m1m, coxae with 1 psp each.

Dorsal chaetotaxy rather symmetrical, as in Fig. 51. Dorsal chaetae well differentiated into macrochaetae and microchaetae. Sensory chaetae s indistinct on body. On head p2 chaetae are displaced forward in relation to p1 and p3. Chaetae p6 located between pseudocelli a and b on head. Th. tergum I with 10 –11+10– 11 chaetae, chaeta m absent (chaetotaxy type i2-3-). Both Th. terga II and III with lateral microsensilla and with 5+5 or 6+6 axial microchaetae. Chaetae s' absent on Abd. terga I–III and present on Abd. tergum V. On Abd. tergum IV in axial area between M2 and P2 macrochaetae located 7-8 chaetae, medial chaeta m0 present (Fig. 51). Abd. tergum V usually with 2 unpaired microchaeta m0 and p0 (sometimes m0 absent) (Fig. 51). Abd. tergum VI with medial chaetae m0. Relative position of prespinal microchaetae of subparallel type (Fig. 51). M/s ratio on abdominal tergum V as 14.9 –16/5.6– 5.2 (AS = 10). AS 1.1 times longer than inner edge of claw and 3.1 times longer than their basal diameter.

Chaetotaxy of ventral side of head as in Fig. 56. Perilabial area with 4+4 a-chaetae. Postlabial chaetae 4 –5+4– 5 along ventral groove. Th. sterna I–III without chaetae. VT with ca. 8 –9+8– 9 chaetae, and 2 chaetae at base. Chaetotaxy of Abd. sternum IV as in Fig. 57. Furcal rudiment: cuticular fold (located on the anterior edge of the sternum) with 2+2 dental microchaetae in 2 rows. Chaetotaxy of manubrial field: 4 chaetae present in ma-row, 4 chaetae in ma’ -row, 4-5 chaetae in mm’’ -row, 5-6 chaetae in mm’ -row, 4 chaetae in mm-row and 4-5 chaetae in mp-row (in adult specimens) (Fig. 56). MVO absent. Each lateral anal valves with a0 and 2a1 (a2 absent); upper anal valve with chaetae a0, 2a2, 2b1, 2b2, c0, 2c1 and 2c2 (Fig. 59).

Subcoxae 1 of I, II and III legs with 5, 6-7, 6 chaetae, subcoxae 2 with 1, 5, 4, coxae with 3, 10-11, 13, trochanters with 11, 11, 10, femora with 18, 18, 18, tibiotarsi with four rows of chaetae (distal whorl (A+T)+B+C): 11+8+3, 11+8+3, 11+8+4 chaetae respectively. Claw with strong denticle in the 1/2 of inner edge of claw (Fig. 55). Empodial appendage of the same length as inner edge of claw, without basal lamella. (Fig. 55).

Etymology.

The species is cordially dedicated to Vasilina, a granddaughter of Dr. Sophya Stebaeva.

Discussion.

The same number of pso on body ventrally (2+2 on head and 1+1 on Abd. sternum V), the presence of pseudocelli on subcoxae 1 of all legs, 2+2 posterior cephalic pso and 2+2 pso on Abd. tergum V allow suggesting a close similarity between Protaphorura vasilinae sp. n. and Protaphorura jernika sp. n. (see also discussion of Protaphorura jernika sp. n.). These species distinctly differ in the number of pso on Th. terga II–III and Abd. tergum IV (2+2,2+2 and 3+3 in Protaphorura vasilinae vs 3+3,3+3 and 4+4 in Protaphorura jernica respectively), in the formula of psx on Abd. sterna (110001m in Protaphorura vasilinae vs 111000 in Protaphorura jernica ) and in the chaetotaxy of Th. tergum I (chaetotaxy type i2-3- in Protaphorura vasilinae vs i2-3m in Protaphorura jernica ) and Abd. tergum V ( s’ present in Protaphorura vasilinae vs s’ absent in Protaphorura jernica ).