Oncopodura siquierae, Seminario-Córdova & Baquero & Jordana & Vadell, 2018

Seminario-Córdova, Renzo A., Baquero, Enrique, Jordana, Rafael & Vadell, Mateo, 2018, Collembola of the Campanet cave (Mallorca, Balearic Islands), with descriptions of new species of Pseudosinella (Entomobryidae) and Oncopodura (Oncopoduridae), Zootaxa 4532 (1) : -

Oncopodura siquierae sp. nov.

urn:lsid:zoobank.org:act:BD7AFA68-D7F8-41EF-9341-0D3C12908B55

( Figs 3 A–O)

Type material. Holotype. Male slide Co 020213 -2, ‘ Coves de Campanet , Sala de la Bodega’ , municipality of Campanet, Mallorca, Spain, 2.II.2013, pitfall, on rotten wet timber, AT 19.1, ST 17.4 and 82% of RH, M. Vadell leg. Deposited in MBCN . Paratypes deposited in MZNA: six specimens in slide, ‘ Sala de les Arrels’, pitfall, AT 19, ST 18.2 and 82% of RH, 06.IV.2013 (Co 040613 -1) . Paratypes deposited in MBCN, Sala de les Arrels: four specimens, pitfall, AT 19, ST 18.2 and 82% of RH, 6.IV.2013 (Co 060413 -1); one specimen, pitfall ref. Trap 1, AT 19, ST 17,4 and 94% of RH, 2.XI.2013, (Co 021113 -4); two specimens, pitfall, AT 18.6, ST 18.6 and 96.14% of RH, 30.XI.2013, (Co 301113 -3); one specimen, pitfall ref. Trap 2, AT 18.74, ST 18.4 and 94.59% of RH, 29.II.2014 (Co 290214 -2); one specimen, pitfall ref Trap 1, AT 18.80, ST 18.6 and 94.29% of RH, 15.III.2014 (Co 150314 -1); one specimen, pitfall ref. Trap 2, AT 18.78, ST 18.2 and 94.41% of RH, 15.III.2014 (Co 150314 -5); two specimens, pitfall ref. Trap 1, AT 19.86, ST 18.2 and 85.94% of RH, 16.IV.2014 (Co 160414 -2); eight specimens, pitfall ref. Trap 2, AT 19.46, ST 18.2 and 90.09% of RH, 16.IV.2014 (Co 160414 -4); one specimen, pitfall ref. Trap 3-IN, AT 19.04, ST 18 and 91.26% of RH, 16.IV.2014 (Co 160414 -6); one specimen, in micro rimstone (gours) with water, AT 19.60, ST 18 and 88.35% of RH, 30.VII.2014 (Co 300714 -5); Sala del Llac: one specimen, over stalagmites, AT 19.18, ST 18.4 and 92.62% of RH, 30.VII.2014 (Co 300714 -2); Sala de la Bodega: one specimen, over a rotten and soaked wood piece, AT 18.7, ST 17.8 and 84% of RH, 6.VII.2013 (Co 060713 -3); two specimens, into a rotten and soaked wood piece, AT 20.40, ST 18.4 and 83.02% of RH, 15.VIII.2014 (Co 150814 -2). All material M. Vadell leg.

Diagnosis. Unpigmented and without eyes. PAO a single small vesicle. Ant IV with four distal leaf-shaped sensilla and a basal pointed cylindrical chaeta. Basal dens with one posterior inner spine; distal dens with one inner toothed and hook-like spine and one large disto-external hook-like spine. Mucro with four teeth, the basal one distinctly sharp.

Description. Length of Holotype 1.45 mm (Paratype 2.10 mm). Lacking pigment.

Head. Ant IV with four leaf-shaped sensilla ( Fig. 3A ), and a more or less broad and pointed modified chaeta near the base ( Fig. 3B ). Paired sensilla of Ant III sensory organ ( Fig. 3D ) leaf or paddle shaped; segment proximally with modified cylindrical and pointed chaeta ( Fig. 3E ); Ant II with 12 expanded chaetae ( Fig. 3G ). Ant I with seven expanded chaetae. Eyes absent; PAO with single small vesicle ( Fig. 3H ). Postlabial chaetae slightly basally swollen ( Fig 3H ), six along the cephalic groove.

Body chaetotaxy. The pattern for chaetotaxy follows the general scheme described for the genus ( Szeptycki 1977; Jordana et al. 2012). The arrangement of the bothriotricha over the body typical of the genus: 1 + 1 on Th II, 2 + 2 on Th III and 1 + 1 on Abd II. The 3 + 3 submedial chaetae on Abd V as long chaetae with roundish tips. The axis of Th II with six chaetae; the pseudopore in the fourth row, with a close and internal microchaetae; externally, the bothriotricha accompanying chaetae longer than the others on the tergite; special chaeta a 4 is present, similar one on Abd III (p 5). Long chaetae on Abd II between pseudopore and bothriotricha. One macrochaeta on Abd III (m 5 or m 6), and on Abd IV four ciliated macrochaetae.

Legs. External face of leg 2 tibiotarsus with spatulated chaetae characteristic of the genus ( Fig. 3J ); tibiotarsus on all legs with large ciliated chaetae ( Fig. 3K ); claw with inner edge smooth, with pseudonychia on basal two thirds of claw; empodial appendage smooth, external lamela without teeth ( Fig. 3L, 3M ).

Furca. Tenaculum with four teeth and one chaeta on the corpus ( Fig. 3I ).

Dental segmentation incomplete, with a four-toothed inner proximal spine, one two or three toothed internal distal spines (more or less falcate) and one large, slightly spinate, external distal falcate spines. Mucro with four teeth: two apical, one medial and one basal, sharp, between them a wavy membranous crest ( Figs 3N, 3O ).

Etymology. The species name is dedicated to Mrs. María Antònia Siquier, general manager of ‘Coves de Campanet’.

Remarks. The new species is similar to O. gledensis Baquero, Vadell & Jordana, 2007 , with which it shares the morphology of the PAO (with a single vesicle), and unlike all other members of the genus. However, O. siquierae sp. nov. and O. gledensis differ in the form and number of certain chaetae: the shape of the modified chaeta or sensillum of the Ant IV base (cf. Figs 3B, 3C ) and the shape of the proximal chaeta associated with the sense organ of Ant III (cf. Figs 3E, 3F ); the number of broadened chaetae of Ant II–IV, more numerous in the new species (there are 13 on Ant II in the new species and four in O. gledensis ), also postlabial chaetae are narrower in the new species; the inner proximal spine on the dens has four teeth in the new species, whereas in O. gledensis there are three; and, although difficult to characterise, the outer lamella of the empodium is smooth in the new species, whereas some teeth are evident in some specimens of O. gledensis . This combination of characters suggest that these specimens should be considered as a new species of the O. tricuspidata group ( Deharveng 1988): Ant IV with four thick sensillae arranged in a line; OPA small (1–4 rounded lobes) or absent; hooks of the dens smooth, but provided with strong denticles on their outer face (subgroup ‘tricuspidata’: Ant IV with another thickened sensillum at the base; claw with a long external tooth; small or very small pretarsal bristles). Table 2 shows the differences between the European species of this species group.

Figures

FIGURE 3. Oncopodura siquierae sp. nov. A, Ant IV, right and dorsal view (only the areas inside the dotted line circle have all the chaetae drawn) (bar 0,02 mm); B, detail of the modified chaeta on Ant IV base; C, same as B for O. gledensis of homologous modified chaeta drawn in B; D, Ant III; E, detail of the special chaeta basal to sense organ of Ant III (bar 0,02 mm); F, same as E for O. gledensis of homologous modified chaeta drawn in E; G, Ant II (bar 0,02 mm); H, Ant I and head area where the PAO is situated (bar 0,02 mm); H’, shape of the ventral head chaetae; I, tenaculum (bar 0,02 mm); J, leg 2 tibiotarsus in lateral view showing only the spatulate chaeta (bar 0,02 mm); K, hind leg tibiotarsus and claw complex, showing only the largest chaetae (bar 0,01 mm); L, detail of hind leg claw complex (bar 0,01 mm); M, ventral view of hind leg claw (bar 0,01 mm); N, lateral view of mucro, dens and distal end of manubrium (bar 0,02 mm); O, posterior view of right dens (bar 0,02 mm).