Pseudachorutes labiatus Zoughailech, Hamra-Kroua & Deharveng, 2016, sp. nov.

• Main Authors: Zoughailech, Abdelmalek, Hamra-Kroua, Salah, Deharveng, Louis
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Entognatha; Collembola; Neanuridae; Pseudachorutes; Pseudachorutes labiatus; Arctic; Rotten; Buttress; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.6055134; https://zenodo.org/record/6055134

Pseudachorutes labiatus sp. nov. Figs 5, 6, 7D, E, G, 8B, Table 4 Type material ( leg. A. Zoughailech). Holotype male on slide, Algeria, Skikda, Collo Massif, near Kenoua village, 750 m alt., Quercus suber forest, in rotten wood, xii.2013. Type locality coordinates: 37.044561°N, 6.416577°E. Nine paratypes on slides (6 females, 2 males and 1 juvenile), Collo Massif, near Khnak Mayoune Village, 510 m alt., Quercus canariensis and Q. suber forest, in rotten wood, xi.2013. Holotype male and 4 paratypes on slides deposited at LBEA; 5 paratypes on slides deposited at MNHN. Description . Body length range without antennae 0.698 to 1.055 mm (females, N=4), 0.647 to 1.003 mm (males, N=2), holotype male 0.647 mm. Habitus usual for the genus (Fig. 5 A). Color in ethanol bluish-grey, ocular plate bluish black. Dorsal granulation of the tegument fine and regular. Secondary granules rounded, subequal to chaeta sockets in diameter on head and body. Five to nine secondary granules between chaetae P1 on Abd V. Antenna (Figs 5 B, 7G). Antennae shorter than head. Ant. I with 7 chaetae, Ant. II with 12 chaetae (11 mes and a ventro-lateral mic). Ant. III with 17 – 18 ordinary chaetae and 5 S-chaetae. Ant. III and IV fused dorsally. AIIIO externo-distal, consisting of two small rod-like S-microchaetae, surrounded by two subequal, subcylindrical guard S-chaetae, slightly longer than S1–S4 and S7–S8 of Ant. IV, and a ventral S-microchaeta. Ant. IV with 6 subequal, short, subcylindrical, bent S-chaetae dorsally (S1 to S4 and S7–S8), dorso-external S-microchaeta present; no thickened S-chaeta ventro-basally; subapical organite present, very small, apical bulb well differentiated, simple. Head (Figs 5 A, C, D, 7D, E). PAO roundish, 1.5 times larger than closest eye diameter, with 5 to 8 vesicles. 8+8 eyes. Buccal cone rather short. Mandible thin, with 2 teeth; maxilla styliform, relatively thick, constituted of 2 lamellae. Labrum elongate, apically rounded, with ventro-distal sclerifications buttress-like. Labral formula:?2/ 2,3,2,4. Labium with 11 – 12 ordinary chaetae: 4 basal chaetae (E,F,f,G), 4 distal chaetae (A,B,C,D), 3 or 4 lateral chaetae; papillate chaeta L present, small; three x-papillae present. Peri-labial area with 5+5 subequal chaetae of which 2+2 along linea ventralis. Dorsal head chaetotaxy constituted of ordinary subequal mesochaetae. Central area with 19 chaetae (unpaired d1, d2 to d5, sd1 to sd5), a0 absent. Ocular area with 3 chaetae. Postero-internal area with 4+4 chaetae (c1, c2, p1, p2). Tergites (Figs 5 A, 8B, Table 4). Chaetal pattern summarized in Table 4. Chaetotaxy constituted of subequal ordinary mesochaetae and slightly longer and thicker S-chaetae. Formula of S-chaetae per half tergite: 2+ms,2/ 1,1,1,1,1. Position of S-chaetae from Th. II to Abd. V 3,3/4,4,4,4,2. Th. II with chaeta a2 present. Th. II with one supplementary chaeta De4. Abd. V with chaeta p2 absent. Abd VI with 13 dorsal chaetae. Thoracic sternites and legs (Fig. 6 B). Th. I – III sternites without chaetae. Claw with small median inner tooth, without lateral teeth. Tibiotarsi I, II and III with 19, 19 and 18 chaetae (M present), no clavate tenent hairs. Femora I, II and III with 13, 12 and 11 chaetae. Trochanters I, II and III with 6, 6 and 6 chaetae. Coxae I, II and III with 3, 7, and 7 chaetae. Subcoxae 2 of legs I, II and III with 0, 2, 2 chaetae. Abdominal sternites and appendages (Figs 6 A, C, D). VT with 4+4 chaetae. Abd. II with 4+4 chaetae. Abd. III not clearly separated from Abd. IV, with 4 – 5+4 – 5 anterior chaetae and 2+2 posterior ones which may belong as well to Abd. IV. Furca well developed. Tenaculum with 3+3 teeth. Manubrium with 12 – 13+12 – 13 posterior chaetae including 4+4 chaetae VL, of which VL3 and 2+2 chaetae longer. Dens with (5) – 6 chaetae, about 2 times longer than mucro. Mucro with a subapical hook and a broad lateral lamella. Abd V with 3+3 chaetae Ag, in continuity with more lateral chaetae VL which are not individualized as a chaetal group. Female genital plate with 1+1 genital microchaetae and 10 – 11 circumgenital chaetae. Male genital plate with 4+4 genital microchaetae and 12 circumgenital chaetae. Abd VI with 14 chaetae Ve (and a 15th chaeta slightly longer than the others and set apart laterally). Anal flaps with 2 hr each. No modified ventral chaetae in male. Etymology. In reference to the presence of three x-papillae on the labium, an unusual character among Pseudachorutes species. Ecology . Pseudachorutes labiatus sp. nov. was collected in a single sample from rotten logs in Quercus suber and Q. canariensis forests of the Collo massif. The species is bisexual. Discussion. Among Pseudachorutinae, the presence of three x-papillae on labium as observed in Pseudachorutes labiatus sp. nov. has only been reported to our knowledge by Fjellberg (1985) for P. indiana Christiansen & Bellinger, 1980 from Alaska. The new species differs from the latter by many characters: much smaller size (0.65 – 1.05 vs 1.7 mm), mandible with 3 vs 4 teeth, chaeta a2 on Th. II (present vs absent), lower number of vesicles in PAO (5 – 6 vs 10 – 14). Aside from these minute hyaline structures, that may have well been overlooked in descriptions of the literature, Pseudachorutes labiatus sp. nov. is most similar to P. vasylii Kaprus’ & Weiner, 2009 from which it differs by having chaetae a2 on Th. II (absent in P. vasylii ) and (4+S) chaetae De on Th. II–III (3+S in P. v a s yl i i ). : Published as part of Zoughailech, Abdelmalek, Hamra-Kroua, Salah & Deharveng, Louis, 2016, New species of Pseudachorutes (Collembola: Neanuridae) from Northeastern Algeria, pp. 557-568 in Zootaxa 4158 (4) on pages 565-567, DOI: 10.11646/zootaxa.4158.4.7, http://zenodo.org/record/259708 : {"references": ["Fjellberg, A. (1985) Arctic Collembola. 1. The collembolan fauna of Alaska: Families Poduridae, Hypogastruridae, Odontellidae, Brachystomellidae and Neanuridae. Entomologica Scandinavica, 21 (Supplement), 1 - 126.", "Kaprus', I. J. & Weiner, W. M. (2009) The genus Pseudachorutes Tullberg, 1871 (Collembola, Neanuridae) in the Ukraine with descriptions of new species. Zootaxa, 2166, 1 - 23."]}