New Collembolan species of the genera Sensiphorura Rusek, 1976 (Pachytullbergiidae) and Cephalachorutes Bedos & Deharveng, 1991 (Neanuridae) from Southern Vietnam Author Shveenkova, Yulia B. text Zoosystema 2017 2017-03-31 39 1 75 85 http://dx.doi.org/10.5252/z2017n1a9 journal article 10.5252/z2017n1a9 1638-9387 5089012 urn:lsid:zoobank.org:pub:BA9DD7CD-AF16-4D7C-8C0B-D9D1A7F5F632 Cephalachorutes judithae n. sp. ( Figs 4 , 5 ) TYPE MATERIAL . — Holotype . ♂ , Southern Vietnam , Province Dong Nai , Cat Tien National Park , 12.XI.2005 , deciduous forest of Lagerstroemia calyculata , soil, c. 149 m a.s.l. , Yu. Shveenkova leg.; deposited in MSPU . Paratypes . 1 ♀ juv., same data as holotype , 1 ♀ , same data as holotype , but 11.XI.2005 , 1 ♀ , same data as holotype , but forest of Dipterocarpus alatus on a basalt ridge, 18.XI.2005 . Other material . 2 juv. , same data as holotype , 1 juv. , same data as holotype , but bamboo thickets, 17.XII.2005 , 1♀ , same data as holotype , but forest of Afzelia xylocarpa , 17.XII.2005 . 1 paratype ♀ juv. deposited in MSPU , 2 paratypes ♀♀ deposited in MNHN . DIAGNOSIS. — Color white, without pigmentation and eyes. Ssensilla on Ant. IV: S1-S3 slightly stout and rather short, ms slightly longer (developed as S-sensilla); S8, S4, S7 relatively longer. S4 and S7 much thicker than other S-sensilla. S-sensilla of Ant. III: S2 and S5 subequal to ms on Ant. IV. S2 two times longer than S3-4 (so S3, S4 are relatively large). A2 absent on all tergites, p2 absent on Abd. IV. Dens with 5 + 5 chaetae. ETYMOLOGY. — The species is named in honor of Judith Najt, for her great contribution to systematics of Neanuridae , including tropical groups of species. DESCRIPTION General Holotype 570 µm , paratype ( ♀ juv.) 620 µm . Color white, without pigmentation. Integumentary secondary granulation developed. Eyes absent. Antennae Ant. IV and Ant. III almost fused dorsally ( Fig. 4B ). Ant. IV with apical papilla reduced and fused with the apex; subapical organite in ventro-apical position ( Fig. 4C ). Seven well developed, thickened S-sensilla on Ant. IV. S1-S3 slightly stout and rather short, ms slightly longer (developed as Ssensilla); S8, S4, S7 relatively longer. S4 and S7 much thicker than other S-sensilla. Sensory organ of Ant. III with ventral guard S-sensilla (S2), 2 rod-like internal S-microchaeta (S3-4), ventral S-microchaeta (S1) and dorsal guard S-sensilla (S5, shifted apically towards S8 of Ant. IV). Sensilla S2 and S5 subequal to ms on Ant. IV. S2 two times longer than S3-4 (so S3, S4 are relatively large). Ant. I and Ant. II with 7 and 11 chaetae respectively. Mouthparts Mouthparts typical for the genus ( Fig. 5C ). Mandible long and thin with 2 strong basal teeth, 7 very small or some larger and 2 apical bigger. Labium typical for the genus ( Fig. 5A ). Chaetotaxy Head without chaetae a0 and c3 ( Fig. 4A ). Body chaetom composed of small normal chaetae and long sensory S-chaetae, ratio c. 1:(3-4). Number of S-chaetae on tergites corresponding to standard hypogastrurian pattern (2 + ms, 2/1,1,1,1,1 on each half-tergite from Th. II to Abd. V). Th. I with 2 chaetae on each side. Th. II-III with 3 + S dorso-external chaetae. Th. II-Abd. III with 3 dorso-internal chaetae. A2 absent on all tergites, p2 absent on Abd. IV. On Abd. I 2 + 2 or 1 + 1 chaetae between sensory S-chaetae (chaetae a1 present in some specimens on one side). Tibiotarsus without M-chaetae (7 + 11, 7+ 11, 6 +11 chaetae) ( Fig. 5D ). Subcoxa with 1, 2, 2 chaetae. FIG. 4. — Cephalachorutes judithae n. sp. : A , dorsal chaetotaxy; B , antennae, dorsal view; C , antennae, ventral view. Abbreviations: see Material and methods. Scale bars: A, 0.1 mm; B, C, 0.05 mm. FIG. 5. — Cephalachorutes judithae n. sp. : A , ventral chaetotaxy of head and labium (paratype); B , ventral chaetotaxy of abdomen (paratype); C , mandibles; D , tibiotarsus of second leg (two different views). Abbreviations: see Material and methods. Scale bars: A, B, 0.05 mm; C, 0.025 mm; D, 0.01 mm. Abdominal appendages VT with 3+ 3 chaetae. Furcula well developed, tenaculum with 3+3 teeth, dens with 5+5 chaetae ( Fig. 5B ). Dens about two times longer than mucro. REMARKS Cephalachorutes judithae n. sp. has no eye. Other blind species have six (vs five in C. judithae n. sp. ) chaetae on dens ( C. caecus Bedos & Deharveng, 1991 and C. centurionis Bedos & Deharveng, 1991 ) or tenaculum and furca completely absent ( C. anneae Queiroz & Mendonça, 2016 ). The mentioned species also have smaller S3 and S4-sensilla on antennal organ III: 4,5 (vs two in C. judithae n. sp. ) times shorter than S2. Five chaetae on dens and large S3, S4-sensilla are shared with C. deharvengi Najt & Weiner, 1997 , which clearly differs with 5+ 5 eyes and shorter Ssensilla on Ant. IV.