Deuteraphorura bolivari Arbea, 2021

Beruete, Enrique, Arbea, Javier I., Baquero, Enrique & Jordana, Rafael, 2021, The family Onychiuridae (Collembola) from karst caves of the Basque biospeleologic district, with description of four new species, Zootaxa 5040 (2), pp. 151-194 : 165-168

Deuteraphorura bolivari Arbea sp. nov.

Figs 18−23 , Tables 5 and 12

Type locality. Txorrote cave , Albiztur , Gipuzkoa / Guipúzcoa, coordinates 43,142 44283,-2,125 90513, 650 m asl .

Type material. Holotype male, slide MNCN Ent _89423, Txorrote cave (Loc. 42), Albiztur , Gipuzkoa / Guipúzcoa, 17.VII.1929, C. Bolívar y F. Bonet leg. Paratypes (same informacion as holotype): 2 females (MNCN Ent_ 283554 and MNCN Ent_283555), 3 males (MNCN Ent_89427, MNCN Ent_283552 and MNCN Ent_283553).

Etymology. This species is dedicated to the great Spanish entomologist Cándido Bolivar y Pieltain who, together with Federico Bonet, captured the specimens.

Description. Body whitish. Length (without antennae) 1.2−1.3 mm in females, 1.0−1.2 mm in males; holotype 1.2 mm. Cuticular granulation fine and uniform.

Pso formula 3,2/1,3,3/3,3,3,5,3 dorsally and 1,2/0,1,1/3,2,2,2 ventrally; Abd I sternite without anterior pso, with 2+2 pso at the base of the VT, and 1 + 1 in lateral position; Abd II–III with the paired medial and lateral pso; Abd IV with the paired medial and lateral pso ( Fig. 19 ). Each subcoxa 1 of legs I–III with 2 pso. Neither psx nor psp could be distinguished.

Head. Antennae slightly shorter than the head; ratio length of the antenna/cephalic diagonal 0.85–0.90. Ant IV with subapical organite, and ms basolateral, located above the first proximal row of chaetae. AIIIO composed of 5 papillae, 5 guard chaetae, 2 small internal sensilla, and 2 curved, smooth and ribbed sensory clubs; the lateral ms is located just behind the sensory organ. Ant I−III with 7, 14, and 16 ordinary chaetae, respectively. Poorly delimited antennal base, with finer granulation. PAO with 14–16 compound vesicles arranged in two rows ( Fig. 21 ). Dorsal cephalic chaeta d 0 present ( Fig. 18 ). Maxillary palp simple, with 1 basal and 2 sublobal chaetae. Labral formula 4/342. Labium type AB, with 6 proximal, 4 basomedial (E, F, G, f) and 5 basolateral (b, c, d, e, e’) chaetae. 4 +4 postlabial chaetae along the ventral groove .

Dorsal body chaetotaxy according to Table 12 and Fig 18 . Chaetae-s are well differentiated from ordinary ones, thicker, blunt, and hyaline in appearance. Th II–III with lateral ms. The axial chaetotaxy of Th II to AbdV tergites as 3,3/2–3,2–3,2–3,2,1 pairs of pointed microchaetae ( Fig. 18 ). Abd IV tergite with an axial unpaired chaeta (p 0); AbdV without axial unpaired chaetae; AbdVI with a blunt axial macrochaeta (a 0).

Th I–III sternites without chaetae. Ventral abdominal chaetotaxy according to Fig. 19 . VT with 4 +4(5) distal chaetae, anterior and basal chaetae absent. Furcal vestige reduced to a finely granulated area, with 4 posterior dental microchaetae and two irregular rows of manubrial chaetae: mm row with 2+ 2 and mp row with 2 +2 chaetae, of which the outer ones are macrochaetae. Males with ventral organ formed by short and thick, sub-cylindrical chaetae: 2 longer on the Abd II sternite and 15–18 on the Abd III sternite ( Fig. 20 ). Anal valves with numerous acuminate chaetae; each lateral valve with chaetae a 0 and 2a 1; posterior valve with a 0, 2b 1, 2b 2, c 0, 2c 1 and 2c 2.

Legs. Tibiotarsi of the legs I–III with 18–19 (9,8,1–2),19 (9,8,2), and 17 (9,7,1) chaetae, respectively ( Figs 22 and 23 ). Claw without an internal tooth. The empodial appendix reaches 85 % of the inner edge of the claw, without basal lamella ( Figs 22 and 23 ).

Discussion. Seven species possess the same dorsal pso formula as Deuteraphorura bolivari sp. nov. (32/133/33353): D. eduardi ( Denis, 1938) , D. insubraria (Gisin, 1952) , D. silvaria (Gisin, 1952) , D. pseudoinsubraria ( Dallai, 1970) , D. gemae ( Simón & Luciáñez, 1994) , D. mangazeya Babenko, 2007 and D. montagudi Arbea, 2015 . However, six of them differ from the new species by their ventral pso formulae: D. eduardi 2/0,0,0/1,2,1,2; D. insubraria 3/0,1,1/2,2,1,2; D. pseudoinsubraria 3/0,1,1/1,2,1,2; D. gemae 3/0,1,1/3,2,1,2; D. mangazeya 3/0,1,1/3,2,1,2; D. montagudi 2/0,1,1/3,2,1,1. Apparently, the new species presents the same dorsal pso formula as D. silvaria , but it differs from this species by the disposition of pso on Abd I sternite (1+1 anterior and 1+1 at the base of the VT in D. silvaria compared with no anterior and 2+2 at the base of the VT in the new species), and the shape of the ventral organ of the males (no differentiated chaetae on Abd II sternite and about 30 short, rod-like chaetae, on Abd III sternite in D. silvaria compared with two relatively long thick chaetae on Abd II and 15–18 short thick chaetae on Abd III in the new species). Further differences between these groups of species are summarised in Table 12.

Figures

FIGURES 18−23. Deuteraphorura bolivari sp. nov. 18, dorsal view; 19, abdominal ventral chaetotaxy of a male; 20, male ventral organ; 21, PAO; 22, tibiotarsus and claw of leg I; 23, tibiotarsus and claw of leg III. Scales: 0.1mm (18−19), 0.05 mm (20, 22−23), 0.03mm (21).