Friesea shaanxiensis, 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 : 64-66

Friesea shaanxiensis sp. nov.

( Fig. 1–9 )

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

Description. Colour: pale. Length: 600 µm. Cuticle with fine granulation.

Head ( Figs. 1–4 ): 8+8 ocelli. Eye patches with scattered black pigment. Cephalic diagonal length 158 µm. Antenna shorter than cephalic diagonal, ratio of antenna to head as 0.5; length ratio of Ant. I: II: III+IV as 1: 0.9: 1.9. Ant. I with 7, ant. II with 13 ordinary setae. Ant. III organ normal, apical with 2 sensory rods and 2 long sensillae ( Fig. 2 ). Ant. IV dorsal with 6 blunt sensillae, 1 microsensillum (ms) and 1 internal­setae (i) and ventral with about 10 microsetae; apical bulb simple (after Deharveng & Bedos, 1991). Ant. III– IV stocky. Maxilla typical for the genus. Labral setae 2/2, 5, 3 ( Fig. 3 ). Labium as in Fig. 4 , labial triangle with 7 setae on each half.

Body: Setae all simple, thin, subequal in length, of moderate size even on abd. V–VI; s­setae 1.3 to 2.2 times as long as ordinary mesochaetae. Dorsal axial setae pairs as 1, 2, 2/ 2, 2, 2, 2, 2, 2. Seta a2 absent on th. III­abd. III. Abd. V with 2+2 setae between s­setae. Six annal spines subequal in length, as long as unguis ( Fig. 6 ).

Dorsal chaetotaxy: as illustrated in Fig. 2–4 . 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 respectively with 2 sensillae p3 and p6 on each side. Abd. I–IV with sensillum p4. Abd. V without a2, with a long sensillum p2 ( Fig. 6 ). Tergite chaetotaxy as follows:

Di De Dl L

Th. I 1 2 _ 1

Th. II 4 2+s 2+s 2

Th. II 3 2+s 2+s 2

Abd. I 3 2+ s 2 1

Abd. II 3 2+ s 2 1

Abd. III 3 2+ s 2 1

Ventral chaetotaxy: Head with 2+2 setae along ventral line. Ventral tube with 4 setae on each half. Furca and tenaculm absent. Genital apertures of female with 8 setae ( Fig. 7 ). Anal lobes as in Fig. 9 , with 3 high­reduced (hr) setae on each half.

Tibiotarsi I, II and III with 16, 16 and 15 setae respectively, with 3 clavate tenent hairs of each. Unguis length 16µm, without inner teeth; unguiculus reduced to a small protuberance ( Fig. 8 ).

Remarks. This species resembles Friesea ladeiroi da Gama, 1959; Friesea xitlensis Palacios­Vargas & Acosta, 1994 and Friesea carlota Christiansen & Bellinger, 1988 in anal spines, 8+8 ocelli and lacking furca and tenaculum. However, it differs from Friesea ladeiroi in claws ( F. ladeiroi with one inner tooth of each claw, after Massoud, 1967) and differs from Friesea xitlensis and carlota in capitate setae of abd. V and VI ( F. xitlensis with 4 capitate setae of abd. VI, Palacios­Vargas & Vidal­Acosta, 1994; F. carlota with a pair of long and capitate setae of each, Christiansen & Bellinger, 1998).

Etymology. The name of the new species is after the locality of types, Shaanxi Province.

Figures

FIGURES 1 – 9. Friesea shaanxiensis sp. nov. 1. Head. 2. Ant. III – IV, dorsal. 3. Labral setae. 4. Labium. 5. Th. III. 6. Abd. II – VI. 7. Female genital aperture. 8. Hindfoot complex. 9. Left anal lobes.