Spinonychiurus subedinensis ( Jordana & Arbea 1985 ) Jordana & Arbea, 1985

Pomorski, Romuald J. & Kapruś, Igor J., 2015, Revision of the genus Spinonychiurus Weiner 1996 (Collembola: Onychiuridae) with description of five new species, Zootaxa 3914 (2), pp. 101-121 : 106

Spinonychiurus subedinensis ( Jordana & Arbea 1985) comb. nov.

( Figs 13–20 )

Onychiurus subedinensis Jordana & Arbea 1985: 66 .

Type material. Holotype (unreproductive male) and 6 paratypes (3 females, 2 males: 1 reproductive and 1 juvenile) (mounted on one slide) Spain, Occidental Pyrenees, Brezal Zuraun (Quinto Real) 1100 m, 21.ix.1977, leg.? (preserved in the collection of the Department of Zoology and Ecology, University of Navarra).

Redescription. Color white. Length of adults: females 0.95–1.0 mm, males 0.8–0.82 mm. Body shape cylindrical with relatively long anal spines ( Fig. 13 ) (ratio anal spine/inner edge of claw = 1.6). Granulation of body surface fine and uniform, distinctly stronger around pseudocelli, especially on the front of head. Antennal bases partly marked.

Antennae nearly as long as head or slightly longer. Antennal segment IV with typical subapical organite and two poorly marked cylindrical sensilla in dorsal-subapical and internal-subbasal position ( Fig. 15 ). Microsensillum on antennal segment IV in latero-external position, a little above first proximal whorl of chaetae. Antennal III sensory organ with 5 guard chaetae, 5 papillae, 2 small sensory rods and 2 bent, smooth with longitudinal ribs sensory clubs, and microsensillum located slightly below antennal III sensory organ ( Figs 15, 16 ).

Postantennal organ consists of 18–22 granulated vesicles ( Fig. 14 ). Labial palp of A type.

Pseudocellar formula dorsally: 34/233/3-44454, ventrally: 1/000/0 0 0 0. Subcoxae1 of I–III legs with 1 pseudocellus each. Parapseudocellar formula: 1/000/ 112103 (each anal valve with parapseudocellus). Localization of parapseudocelli on abdominal sterna I/VI as in Fig. 20 . Parapseudocelli on subcoxae1 of I–III legs invisible.

Dorsal chaetotaxy as in Fig. 13 , nearly symmetrical, poorly differentiated into meso- and microchaetae. Thoracic tergum I with 5-6 + 5-6 chaetae. Thoracic terga II and III with microsensilla laterally. Body sensory chaetae s cylindrical, well differentiated their formula dorsally: 1/011/ 221121 and ventrally: 2/00/000100. Abdominal tergum IV with m0 and p0 chaetae. Abdominal tergum V with a0 and p0 chaetae. Abdominal tergum VI with 2 axial chaetae and 1+1 prespinal chaetae. Subcoxae1 of I–III legs with 3, 4, 4 chaetae respectively.

Thoracic sterna I–III with 0+0, 1+1, 1+1 chaetae respectively. Ventral tube of females with 6-7 + 6-7 chaetae and 1+1 chaetae at base ( Fig. 20 ). Furca reduced to small area of fine granulation and three rows of manubrial chaetae behind its posterior edge ( Fig. 17 ). Claws without teeth. Empodial appendage with small basal lamella, shorter than inner edge of claw (ratio 0.75). Tibiotarsi I–III with 11 chaetae in distal whorl ( Fig. 18 ). Male ventral organ composed of 3+3 thickened chaetae, located on posterior part of ventral tube ( Fig. 19 ).

Remarks. S. subedinesis belongs to the group of species with 11 chaetae in distal whorl of tibiotarsi. Because of relatively large anal spines is similar to S. edinensis from which it differs in the absence of 2+2 spines on abdominal tergum V, the presence of basal lamella on empodial appendage and distinct body sensory chaetae s.

Figures

FIGURES 13 – 20. Spinonychiurus subedinensis: 13, habitus, dorsal chaetotaxy and localization of pseudocelli; 14, postantennal organ and pseudocelli at base of antenna; 15, antennal segments III – IV, antennal III sensory organ; 16, sensory clubs of antennal III sensory organ; 17, remnant of furca; 18, tibiotarsal chaetotaxy and claw of legs III; 19, lateral viev of ventral tube, male ventral organ and parapseudocellus; 20, abdominal sterna I – VI, chaetotaxy and localization of parapseudocelli.