Protaphorura tuvinica, 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 : 133-135

Taxon classification Animalia Collembola Onychiuridae

Protaphorura tuvinica sp. n. Figs 45-50, 59

Type material.

Holotype (male): Russia, S-W Tuva, ca 30 km SW of Mugur-Aksy, upper reaches of Mugur River, Mongun-Taiga Mts, mountain tundra, moss under Betula rotundifolia , 2700 m alt., 50°22'N, 90°05'E, 23.VII.1993, leg. S.K. Stebaeva (SNHM). Paratypes: 10 males, 3 females and 7 juveniles, same data as holotype (SNHM - 6 paratypes: 5 males and 1 female, ISEA - 4 paratypes: 3 males and 1 female, MSPU - 4paratypes: 3 males and 1 female, and 7 juveniles).

Diagnosis.

PAO with 37-45 simple vesicles. Pso formula dorsally 32/022/33332, ventrally 2/000/0001, subcoxae 1 of I–III legs without pso. Submedial pso a and b on Abd. terga I–II located far apart. Psx formula on Abd. sterna: 110-1001 m. Th. tergum I with 9 –11+9– 11 chaetae, chaeta m absent. Chaetae s' absent on abdominal terga I–III and V. Manubrial field with 19 chaetae in 4 rows. Claw without lateral denticles.

Description.

Holotype (male) length 1.9 mm, length of paratypes: 1.7-1.8 mm (males) and 1.9-2.2 mm (females). Shape of body typical for the genus: cylindrical with strong AS on distinct papillae (Fig. 45). Colour in alcohol yellowish-white. Granulation more or less uniform, distinct. Usually 11-12 grains around each pso.

Antennae slightly shorter than head, their base well marked. Ant. I with 9-10 chaetae, Ant. II with 17 chaetae. AIIIO consisting of 5 guard chaetae, 5 papillae, 2 smooth sensory rods, 2 straight and granulated sensory clubs, ventro-lateral microsensillum present (Fig. 47). 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. 68-70). Sensilla indistinct on Ant. IV (Fig. 47).

PAO of middle length, consisting of 37-45 simple vesicles (Fig. 48). 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 45, 46, 50). Subcoxae 1 of I–III legs without pso and with one psx each. Submedial pso a and b on Abd. terga I–II located rather far apart, i.e. on similar distance as on Abd. tergum III (Fig. 45). Psx formula 0/000/110(1)01. Psp formula dorsally 0/011/1111, ventrally 0/111/01m1m1m, coxae with 1 psp each.

Dorsal chaetotaxy rather symmetrical and plurichaetotic, chaetae well differentiated into macrochaetae and microchaetae (fig. 45). Sensory chaetae s indistinct on body. On head p2 chaetae displaced forward in relation to p1 and p3. Chaetae p6 on head located between pso a and b (Fig. 45). Th. tergum I with 9 –11+9– 11 chaetae, chaeta m absent (chaetotaxy type i2-). 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 V. On Abd. tergum IV in axial area between M2 and P2 macrochaetae located 7-8 chaetae, medial chaeta m0 present (Fig. 45). Abd. tergum V usually with 1-2 unpaired microchaeta m0 and p0 (often m0 absent) (Fig. 45). Abd. tergum VI with medial chaetae m0. Relative position of prespinal microchaetae of parallel type (Fig. 45). M/s ratio on Abd. tergum V as 14.6 –17.2/4.6– 6.2 (AS = 10). AS 0.9-1.0 as long as inner edge of claw and 3.1 times longer than their basal diameter.

Chaetotaxy of ventral side of head as in Fig. 46. Perilabial area with 5+5 a-chaetae (Fig. 46). Postlabial chaetae 5-6+5-6 along ventral groove. Th. sterna I–III without chaetae. VT with ca. 8 –9+8– 9 chaetae and 2 chaetae at base. Furcal rudiment: cuticular fold (located on the anterior edge of the sternum) with 2+2 dental microchaetae in 2 rows. Chaetotaxy of manubrial field: 5 chaetae present in ma-row, 4 chaetae in mm’ -row, 6 chaetae in mm-row and 4 chaetae in mp-row (Fig. 50). 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 (as in Protaphorura vasilinae , Fig. 59).

Subcoxae 1 of I, II and III legs with 5-6, 6, 5 chaetae, subcoxae 2 with 1, 5, 5, coxae with 3, 10, 13, trochanters with 11, 12, 10, femora with 20, 20, 19-20, tibiotarsi with four rows of chaetae (distal whorl (A+T)+B+C): 11+8+3, 11+8+3, 11+8+3-4 chaetae respectively. Claw with strong denticle in 1/2 of inner edge of claw (Fig. 49). Empodial appendage of the same length as inner edge of claw, without basal lamella. (Fig. 49).

Etymology.

The name of the new species refers to the Tuva Republic (Russian Federation), the place where the type specimens were collected.

Discussion.

Protaphorura tuvinica sp. n. belongs to the group of Protaphorura species without pseudocelli on subcoxa 1 of all legs and with 2+2 pso ventrally on head: Protaphorura ombrophila (Stach, 1960), Protaphorura kopetdagi Pomorski, 1994, Protaphorura salsa Kaprus’, Paśnik & Weiner, 2014, Protaphorura bakhchisaraica Kaprus’, Paśnik & Weiner, 2014 and Protaphorura ajudagi Pomorski, Skarżyński & Kaprus’, 1998. All these species inhabit the territory of southern Palearctic from Crimean Peninsula to central Asia and southern Siberia.

The new species has the pseudocellar formula the same as in kopetdagi (32/022/33332) when the other posses the different number of pseudocelli. The males of Protaphorura kopetdagi , Protaphorura salsa , Protaphorura bakhchisaraica and Protaphorura ajudagi are armed with the male ventral organ whereas the new species and Protaphorura ombrophila have males devoided of the organ. Protaphorura tuvinica differs also from the latter species by the number of pso on Abd. terga IV-V (3,2 in the new species and 4,2 in Protaphorura ombrophila ).