Protaphorura sayanica, 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 : 129-133

Taxon classification Animalia Collembola Onychiuridae

Protaphorura sayanica sp. n. Figs 37-44, 58

Type material.

Holotype (male): Russia, Siberia, Western Sayan, Oiskii Mt. Range, vicinity of weather station Olenya Rechka, mountain tundra, 1800 m alt., in moss and soil, 52°48'N, 93°13'E, 10.VII.1990, leg. S.K. Stebaeva (SNHM). Paratypes: 2 females and 2 juveniles, same data as holotype (SNHM - 1 paratype female, ISEA - 1 paratype female and 2 juveniles); 2 females: Russia, Krasnoyarsk Territory, Khakasia, Kuznetskii Alatau Mt. Range, ca 5 km NW of settl. Kommunar, mountain tundra with Dryas oxyodontha , 1500 m alt., 54°20'N, 89°17'E, 24.VII.1990, leg. S.K. Stebaeva (ISEA); 2 males, female and 2 juveniles: Russia, Kuznetskii Alatau Mt. Range, Kemerovo Prov., 10 km NW of Mezhdurechensk, mixed taiga with rich herbaceous cover, under Abies sibirica , soil, 500-600 m alt., 53°45'N, 88°00'E, 1.VII.1982, leg. S.K. Stebaeva (SNHM); male: Russia, Salair Range, 130 km SE of Novosibirsk, 11 km N of Mirnyi, chern forest, 500 m alt., soil, 54°38'N, 84°45'E, 7.VI.1972, leg. S.K. Stebaeva (MPSU); female subadult: Russia, West Siberia, 25 km S of Novosibirsk, Akademgorodok, glade in birch forest, soil, 400 m alt., 54°49'N, 83°08'E, 7.X.1994, leg. S.K. Stebaeva (SNHM).

Diagnosis.

PAO with 41-48 simple vesicles. Pso formula dorsally 32/022/33343, ventrally 1/000/0000, 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: 111101m. Th. tergum I with 18 –21+18– 21 chaetae, one or two chaetae m present. Chaetae s' present on Abd. terga I–III and V. Manubrial field with 14 chaetae in three rows. Claw with pair of lateral denticles.

Description.

Holotype (male) length 2.7 mm, length of paratypes: 2.7-2.9 mm (females). Other specimens length: 2.62.7 mm males and 2.8 mm female. Shape of body typical of the genus: cylindrical with strong AS on distinct papillae (Fig. 37). Colour in alcohol yellowish-white. Granulation more or less uniform, distinct. Usually 7-9 grains around each pso.

Antennae as long as the head, their base well marked. Ant. I with 11 chaetae, Ant. II with 16-19 chaetae. AIIIO consisting of 5 guard chaetae, 5 papillae, 2 smooth sensory rods, 2 straight and granulated sensory clubs, ventro-lateral microsensillum present (Fig. 40). Ant. IV with subapical organite in unprotected cavity without clear cuticular papilla (Fig. 39). Microsensillum on Ant. IV in usual position above second proximal row of chaetae. Ventrally Ant. IV with numerous chaetae (ca. 65-70) (Fig. 40). Sensilla indistinct on Ant. IV (Fig. 40).

PAO large, consisting of 41-48 simple vesicles (Fig. 41). 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 32/022/33343, ventrally 1/000/0000 (Figs 37, 38, 44). 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. 37). Psx formula 1/000/111101m. Psp formula dorsally 0/011/1111, ventrally 0/111/01m1m1m, coxae with 1 psp each.

Dorsal chaetotaxy, usually slightly asymmetrical, all dorsal chaetae rather long, well differentiated into macro- meso- and microchaetae, as in Fig. 37. Sensory chaetae s indistinct on body. On head p2 chaetae on the same level as p1 and p3. Chaetae p6 located anterior to pso b on head (Fig. 37). Th. tergum I with 18 –21+18– 21 chaetae, 1-2 chaetae m and 1-2 chaetae i present (chaetotaxy type i(1 –2)2–4m(1– 2)). Both Th. terga II and III with lateral microsensilla and with 5+5 or 6+6 axial microchaetae. Chaetae s' present on Abd. terga I–III and V. On Abd. tergum IV in axial area between M2 and P2 macrochaetae located 15-18 chaetae, medial chaeta p0 present (sometimes p0 absent). Abd. tergum V with one unpaired microchaeta p0 (Fig. 37). Abd. tergum VI with medial chaetae m0. Relative position of prespinal microchaetae of convergent type (Fig. 37). M/s ratio on abdominal tergum V as 18.9 –26.6/15.7– 20.6 (AS = 10). AS 0.8-1.1 times as long as inner edge of claw and 2.9 times longer than their basal diameter.

Chaetotaxy of ventral side of head as in Fig. 38. Perilabial area with 5(4)+5(4) a-chaetae. Postlabial chaetae 4-5+4-5 along ventral groove. Th. sterna I–III with 1 –2+1– 2, 2 –3+2– 3, 2 –3+2– 3 chaetae respectively. VT with ca. 11 –12+11– 12 chaetae, and 2-3 chaetae at base. Furcal rudiment: cuticular fold (located near middle of sternum) with 2+2 dental microchaetae in 2 rows. Chaetotaxy of manubrial field: 4 chaetae present in ma-row, 6 chaetae in mm-row, 4 chaetae in mp-row (in adult specimens) (Fig. 44). MVO absent. 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 7-9, 8-9, 7-8 chaetae, subcoxae 2 with 1, 5, 5, coxae with 4, 10, 12-15, trochanters with 11, 13, 13, femora with 20-21, 20-23, 20-23, tibiotarsi with four rows of chaetae (distal whorl (A+T)+B+C): 11+8+3, 11+8+4-5, 11+8+4-5 chaetae respectively. Claw with strong denticle in 1/2 of inner edge of claw and pair of lateral denticles (Figs 42, 43). Empodial appendage as long as the claw, without basal lamella. (Fig. 43).

Etymology.

The name of the new species refers to the Sayan Mountains in Southern Siberia, an area where the type specimens were collected.

Discussion.

Protaphorura sayanica sp. n. is probably the most similar to such Asiatic Protaphorura species as Protaphorura pjasinae (Martynova, 1976), Protaphorura microtica (Dunger, 1978) and Protaphorura subarctica (Martynova, 1976) due to the presence of the same number of pso on subcoxae 1 of all legs, ventral and dorsal side of head, Th. terga I–II and Abd. terga I–IV. However, Protaphorura sayanica sp. n. may easily be distinguished from these species by the number of pso on Abd. tergum V (3+3 pso in the new species and 2+2 pso all other species presented above) and presence of pair of lateral denticles on claw (absent in other four species).