Friesea quadrispinensis, Gao, Yan & Yin, Wenying, 2006

Gao, Yan & Yin, Wenying, 2006, Two new species of the genus Friesea (Collembola: Neanuridae) from North­west China, Zootaxa 1283, pp. 63-68 : 66-68

Friesea quadrispinensis sp. nov.

( Figs. 10–21 )

Material examined. Holotype 1 male, northwest China, Shaanxi Province, Guangtou Mountain, 2800 km, litter­rich soil in forest of Larix chinensis , 20 /7 /2003, Huan Yin.

Description. Colour: pale. Length: 560 µm. Cuticle with fine granulation.

Head ( Figs 10–13 ): 5+5 ocelli with 3 setae among them ( Fig. 10 ). Eye patches with scattered black pigment. Cephalic diagonal length 148 µm. Antenna shorter than cephalic diagonal, ratio of antenna to head as 0.4; length ratio of Ant. I: II: III+IV as 1: 0.7: 1.3. Ant. I with 7, ant. II with 12 ordinary setae. Ant. III organ normal, apical with 2 sensory rods and 2 long sensillae ( Fig. 11 ). Ant. IV dorsal with 6 blunt sensillae and ventral with about 15 microsetae; apical bulb simple. Ant. III–IV stocky. Maxilla typical for the genus ( Fig. 12 ). Labral setae 2/3, 3, 4. Labium as in Fig. 13 , labial triangle with 5 setae on each side.

Body: Setae all simple, subequal in length, of moderate size even on abd. V–VI; ssetae 1.3 to 2.2 times as long as ordinary mesochaetae. Abd. VI with 4 simple anal spines which are subequal in length, as long as unguis ( Fig. 15 ).

Dorsal chaetotaxy: as illustrated in Fig. 14–15 . Area frontalis of head with median setae “d”. Th. I with 4+4 setae. Seta a2 present on Th. II and absent on Th. III; Th. II and III with 2 sensillae p3 and p6 on each side. Abd. I–IV with a2 and a sensillum p4. Abd. V without a2, with a long sensillum p2 ( Fig. 15 ). Dorsal axial setae pairs as 1, 2, 2/2, 2, 2, 2, 2, 2. Tergite chaetotaxy as follows:

Ventral chaetotaxy: Head with 2+2 setae along ventral line. Ventral tube with 4 setae on each half ( Fig. 16 ). Furca without mucro, dens with 3 setae, manubrium with a row of 2+2 setae ( Fig. 17 ). Tenaculum with 2+2 teeth ( Fig. 18 ). Genital apertures for male as in Fig. 19 . Anal lobes with 3 hr setae on each half ( Fig. 20 ).

Tibiotarsi I, II and III with 16, 16 and 15 setae respectively, with 1 acuminate tenent hair, which is longer than other setae of each tibiotarsi ( Fig. 21 ). Unguis 14µm long, without inner teeth; unguiculus absent ( Fig. 21 ).

Remarks. This species resembles Friesea grandis Mills , HB, 1934 in 4 anal spines. However, it differs from it by mucro­free furca and tenaculum and 5+5 ocelli furca and tenaculum ( F. grandis without furca and tenaculum and with 8+8 ocelli, after Massoud, 1967). It resembles Friesea alaskella Fjellberg, 1985 in general dorsal chaetotaxy and in mucro­free furca and tenaculum. However, it differs from it by 4 anal spines and 5+5 ocelli ( F. alaskella with 6 anal spines and 2+2 ocelli, Christiansen & Bellinger, 1998).

Etymology. The name of the new species is after its 4 anal spines, which is unique in the genus.

Figures

FIGURES 10 – 21. Friesea quadrispinensis sp. nov. 10. Ocelli. 11. Ant. III – IV, dorsal. 12. Maxilla. 13. Labium. 14. Th. II – III. 15. Abd. III – VI. 16. Ventral tube, left side. 17. Furca. 18. Tenaculum. 19. Male genital aperture. 20. Anal lobes. 21. Hind foot complex.