Deuteraphorura boneti ( Gisin, 1953 )

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 : 168-171

Deuteraphorura boneti ( Gisin, 1953)

Onychiurus handschini – Bonet, 1931. Mem. R. Soc. Esp. Hist. Nat., 14(4): 305 (non Denis, 1925)

Onychiurus boneti Gisin, 1953 . Mitt. Schweiz. Entomol. Ges., 26(1): 60

Deuteraphorura boneti (Gisin) : Arbea et al., 2011. Boletín de la Sociedad Entomológica Aragonesa (S.E.A.), 48: 352

Figs 24−25 , Tables 6 and 10

Type material. Martinchurito I and II caves (Loc. 41), 9.VIII.1929, leg. Cándido Bolívar y Federico Bonet, as sintypes of Onychiurus boneti , Lectotype female, designated herein slide MNCN_Ent 89367; Paralectotypes: 1 female and 1 male on the same slide as lectotype ( Fig. 25 ); 9 paralectotypes on the slides MNCN89364 (1 male), MNCN_Ent 89365 (1 female subadult and 1 juvenile), MNCN_Ent 89366 (1 female), MNCN_Ent 89368 (2 females), MNCN_Ent 89371 (1 female), MNCN_Ent 89372 (1 female) and MNCN_Ent 89374 (1 male).

Redescription. Whitish body. Length (without antennae) 1.2–1.3mm (females and males). Cuticular granulation fine and uniform.

Dorsal pso formula as 3,4/1,3,3/3–4,4–5,4,5,4; Abd III tergite with 4 pairs of pso (a, a’, b’, c). Ventral pso formula as 1,2/0,1,1/3 +1,1–2,1–2,2; Abd I sternite with 3 pso on each side of the VT, and 1 +1 anterior pso; Abd II–III with the medial pso sometimes missing. Each subcoxa 1 of the 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 0.70–0.80. 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 sense organ. Ant I−III with 8, 13−14, and 16 ordinary chaetae, respectively. Poorly delimited antennal base, with finer granulation. PAO with 12–14 compound vesicles arranged in two rows. Dorsal cephalic chaeta d 0 present ( Fig. 24 ). 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. Postlabium with 4 +4 chaetae along the ventral groove .

Dorsal body chaetotaxy according to Table 6 and Fig. 24 . Chaetae-s not differentiated from ordinary ones. Th II–III tergites with lateral ms. The axial chaetotaxy of Th II to AbdV tergites as 2,2/2,2,2,2,1 pairs of pointed microchaetae. Abd IV tergite with an axial unpaired chaeta (p 0); AbdV without axial unpaired chaetae; AbdVI with a blunt axial macrochaeta (a 0) ( Fig. 24 ). AbdV tergite p 2 is a short macrochaeta; ratio p 2:P 5 =0.69−0.80.

Th I−III sternites without chaetae. VT with 6−8+ 6−8 distal chaetae, anterior and basal chaetae absent. Furcal vestige reduced to a finely granulated area, with 4 posterior dental microchaetae and two rows of manubrial chaetae; mm row with 1+1(2) and mp row with 2+2 chaetae, of which the outer ones are macrochaetae. Genital plate with 15−22 chaetae and 2 posterior microchaetae in females, and about 40 chaetae on males. Males with ventral organ formed by thick chaetae blunt and rough, in the males of big size: 2 on the Abd II sternite and 7−8 on the Abd III sternite. Anal valves with numerous acuminate chaetae; each lateral valve with a 0 y 2a 1; posterior valve with a 0, 2b 1, 2b 2, c 0, 2c 1 y 2c 2.

Legs. Subcoxae 1 of legs I−III with 3,4,4 chaetae, sub−coxae 2 with 0,3,3 chaetae, coxae with 2−3,10,12−13, trochanters with 9,8−9,7−8, and femurs with 14−15,14−15,13−14 chaetae, respectively. Tibiotarsi of the legs I−III with 18 (9,8,1), 18 (9,8,1) and 17 (9,7,1) chaetae, respectively. Claw without internal or lateral teeth. The empodial appendix reaches 60% of the inner edge of the claw, with a narrow basal lamella reaching 50% of its length.

Discussion. D. boneti is identified by the combination of characters shown in Table 10.

It is separated from the closest species, D. akelaris , by the greater development of the posterior abdominal tergite chaetae, especially by the development of the p 2 AbdV macrochaeta, almost the same size as p 5 (see discussion in D. akelaris ).

Distribution and ecology. Troglobiont species only known from the type locality, Martinchurito cave, in the Sierra de Aralar, Navarra ( Bonet 1931 as O. handschini ). All subsequent records of this species ( Jordana et al. 1997, Beruete 2000a, Beruete et al. 2001) actually correspond to the species D. akelaris .

Figures

FIGURES 24−25. Deuteraphorura boneti. 24, dorsal view of a lectotype; 25, lectotype microscope slide. Scale: 0.2mm.