Sinella quadriseta, Zhang, Feng, Bedos, Anne & Deharveng, Louis, 2014

Zhang, Feng, Bedos, Anne & Deharveng, Louis, 2014, New species of Sinella and Coecobrya (Collembola: Entomobryidae) from New Caledonia, Zootaxa 3814 (4), pp. 553-566 : 554-557

Sinella quadriseta sp. nov.

Figs 1–16

Types. Holotype: female on slide, New Caledonia: Lifou island, near Easo, elevation about 25 m, 18.x.2000, litter in secondary forest, Berlese extraction, Louis Deharveng & Anne Bedos leg. (sample NC00-013). Paratypes: 6 females on slides and 10 in alcohol, same data as holotype. Holotype and 10 paratypes (4 on slides and 6 in alcohol) in MNHN; 6 paratypes (2 on slides and 4 in alcohol) in NJAU.

Description. Body length up to 1.45 mm.

Ground colour pale yellow in alcohol. Reddish pigment on Ant. I and III, head, thorax and Abd. I–IV ( Fig. 1). Most specimens slightly reddish or almost pale. Antenna about 2 times as long as cephalic diagonal. Antennal segments ratio as I:II:III:IV = 1:1.9:1.8:3.0. Rod-like S-chaetae absent on Ant. I and 2 dorsal on distal part of Ant. II. Ant. III organ with chaetae 2 and 3 rod-like, chaeta 8 stronger than others ( Fig. 2 ). Lateral process of labial palp thicker than normal chaetae, with tip reaching beyond apex of labial papilla ( Fig. 3 ). Labial base as mrel1l2, all smooth; r 0.45–0.6 times as long as chaeta m; chaetae X2 and X4 ciliate; chaeta X smooth; chaeta X3 absent ( Fig. 4 ). Dorsal cephalic chaetotaxy with 5 sutural mac (S) and 3 mac in Gr. II ( Fig. 5 ).

Trochanteral organ with 12–19 smooth spiny chaetae; 8–10 in arms and 4–9 between them ( Fig. 6 ). Ungual basal paired teeth unequal, outer one large with tip reaching the distal tooth; distal unpaired tooth tiny. Unguiculus with a large outer tooth. Tenent hair pointed, subequal to unguiculus ( Fig. 7 ). Abd. IV 4 times as long as Abd. III along dorsal midline. Ventral tube anteriorly with 5–7 ciliate chaetae on each side ( Fig. 8 ); posteriorly with 10–14 smooth chaetae ( Fig. 9 ); each lateral flap with 7 smooth chaetae ( Fig. 10 ). Manubrial plaque with 2 pseudopores and 2 ciliate chaetae ( Fig. 11 ). Distal smooth part of dens slightly shorter than mucro. Mucronal basal spine short with tip just reaching apex of subapical tooth ( Fig. 12 ).

Th. II with 2 (m1, m 1i) medio-medial, 1 (m4) medio-lateral, and 15–17 posterior mac. Th. III with 18–19 central, 6 (m5, a6, a 6i, p6, m6, m6e) lateral mac, and 1 mes (p6pe) ( Fig. 13 ). Abd. I with 4 (m 2i, m2–m4) central mac. Abd. II with 3 (a2, m3, m3e) central and 1 (m5) lateral mac. Abd. III with 1 (m3) central and 2 (pm6, p6) lateral mac ( Fig. 14 ). Abd. IV with 4 (I, M, A5, B5) central, 6 (D3, E2–4, E2p, F1) lateral mac and at least 22 sens; E4 sometimes as mes; at least 6 sens much shorter than others ( Fig. 15 ); pseudopore between I and A5. Abd. V with about 45 chaetae and 4 sens; m2, m3 and m5 always much larger than others ( Fig. 16 ).

Ecology. In litter of secondary forest, in the doline of Easo cave.

Etymology. Named after its unusual pattern of 4 S-chaetae on Abd. V.

Remarks. This species is characterized by ciliate X2, X4 and smooth X on ventral side of the head, 2+2 mediomedial and 1+1 medio-lateral mac on Th. II, 4+4 mac on Abd. I, presence of mac a2 on Abd. II, 2+2 mac on Abd. III, 4+4 central mac on Abd. IV, and 4+4 sens on Abd. V. It is closest to S. claviseta sp. nov., but differs from it in claw structure, presence of mac m 2i on Abd. I and mac a2 on Abd. II, ventral tube chaetotaxy and shorter distal smooth part of dens ( Table 1 ).

Figures

FIGURES 2 ‒ 10. Sinella quadriseta sp. nov.: 2, Ant. III organ; 3, lateral process of labial palp; 4, chaetae on the ventral side of head; 5, dorsal cephalic chaetotaxy, circles as macrochaetae, intersectional lines as bothriotricha; 6, trochanteral organ; 7, hind claw; 8 ‒ 10, ventral tube. 8, anterior face; 9, posterior face; 10, lateral flap.

FIGURES 11 ‒ 16. Sinella quadriseta sp. nov.: 11, manubrial plaque; 12, mucro; 13, thoracic chaetotaxy; 14 ‒ 16, abdominal chaetotaxy. 14, Abd. I – III; 15, Abd. IV; 16, Abd. V. Larger circles, macrochaetae; smaller circles, microchaetae; circle with a slash, pseudopore; intersectional lines, bothriotricha ..