Spelaeobochica mahnerti,

Viana, Ana Clara M. & Ferreira, Rodrigo L., 2020, Spelaeobochica mahnerti, a new cave-dwelling pseudoscorpion from Brazil (Arachnida: Pseudoscorpiones: Bochicidae), with comments on the troglomorphism of the Brazilian bochicid species, Zootaxa 4731 (1), pp. 134-144: 135-138

publication ID

https://doi.org/10.11646/zootaxa.4731.1.9

publication LSID

lsid:zoobank.org:pub:CAD3807C-0994-436A-9619-E77DFF58F79C

persistent identifier

http://treatment.plazi.org/id/038A87FA-A426-FFC3-FF05-136CF7A2F878

treatment provided by

Plazi

scientific name

Spelaeobochica mahnerti
status

sp. n.

Spelaeobochica mahnerti  sp. n.

( Figs 1–12View FIGURES 1‒4View FIGURES 5‒9View FIGURES 10‒12; 18View FIGURE 18, left)

Material examined. Holotype female (ISLA 50771), Brazil, Minas Gerais, Gruta Velha Nova, Monjolos (18º16ʹ36.2ʺS, 44º06ʹ07.9ʺW), 15 April 2017, leg. R. L. FerreiraGoogleMaps  . Paratype: male ( ISLA 50772), same details as holotype  .

Etymology. The specific name is given in honor of Dr. Volker Mahnert (1943–2018), who contributed enormously to the knowledge of Brazilian cave-dwelling pseudoscorpions.

Diagnosis. Differing from the congeneric species by the following combination of characters: chelicera with 9−10 dorsal setae, rallum with 3 apically dentate blades (denticulation more pronounced on the distal blade, which is longer than other blades); palps slender (e.g. femur 6.5−6.6, patella 4.1, chela with pedicel 5.6−5.8 times longer than broad), femur with a small distinct tubercle on antiaxial side near distal end, patella with a small tubercle on dorsoparaxial side near the end of pedicel, trichobothrium ib in far distal half of hand dorsum (near the base of fixed finger), absence of accessory teeth on chelal fingers (or, more rarely, the presence of two antiaxial accessory teeth on the fixed chelal finger), venom apparatus present in both fingers; legs slender (e.g. leg IV: femur+patella 5.5–6.3, tibia 9.4−11.4, basitarsus 3.5−3.7, telotarsus 9.6−12.1 times longer than broad), arolia undivided and a little longer than claws, subterminal setae smooth.

Description of adults (female, followed by male in brackets, when different). Troglomorphic habitus ( Fig. 18View FIGURE 18, left). Palps, carapace, chelicerae, coxae and first abdominal segments strong brown, other parts of the body vivid yellow. Tergites and sternites with evident sclerotization along the anterior margin. Vestitural setae smooth, delicate and long.

Carapace. 1.6 times longer than broad, broadest near middle, then slightly narrowed to base; anterior margin smoothly rounded, distinctly sclerotized; without epistome; a very shallow transverse furrow near posterior margin; surface scaly-reticulate; eyes absent; 38 [34] setae (6 on anterior margin and 4 on posterior margin); anterior margin with 10 acute microtubercles [14], and a few more scattered on the carapace.

Chelicera ( Fig. 1View FIGURES 1‒4). Scaly-reticulate; with 9–10 [9] setae on hand; fixed finger with 8–10 rounded [8–9 slightly acute] teeth; movable finger with 11–13 rounded [8–9 slightly acute] teeth, the subterminal tooth large and laterally displaced; galea simple, slender and acute; tip of subgaleal seta almost reaches the tip of galea; serrula exterior with 26 [25–27] blades, serrula interior with 16–18 [19–20] blades (some blades missing in the middle portion); rallum ( Fig. 2View FIGURES 1‒4) with 2–3 [3] apically dentate blades (middle blade probably missing in the left cheliceral rallum of the holo- type), denticulation more pronounced and abundant on the distal blade (which is longer than other blades; the latter almost equally-sized), the two distal blades closely set (when 3 blades are present).

Tergites. Undivided, scaly-reticulate; chaetotaxy I–XI 5: 6: 7: 9: 10: 9: 10: 10: 9: 7: 6 [5: 6: 7: 8: 9: 8: 9: 10: 10: 7: 6]. Lyrifissures present medially on tergites V−VIII: 2, 2, 2, 1 [lyrifissures present medially on tergites IV–IX: 2, 2, 2, 3, 2, 2]. Pleural membranes smoothly, longitudinally striate. Anal cone with one pair of small dorsal setae.

Coxae. Palpal: manducatory process acute, with 5 setae [4–5]: 2 apical marginal setae of unequal length (the distal one longer), 2 discal setae (both are long, but the distal one is slightly longer), and 1 shorter, more basal seta [right: 2 apical marginal setae of unequal length (the distal one shorter) and 2 discal setae (the distal one longer); left: same as holotype, except for the distal discal seta, which is broken]; palpal coxae scaly-reticulate, with several tiny pores, 13 setae [9]; leg coxae scaly-reticulate, with a small lyrifissure next to foramen margin, coxae I and II with some tiny pores on anterior region (II with less pores than I), coxae III and IV without pores; setae I 7–8, II 7, III 7–9, IV 9–11 [I 6, II 6–7, III 6–7, IV 9–10].

Genital operculum of male ( Fig. 3View FIGURES 1‒4). 3 anterior setae and 17 posterior and median setae; surface scaly-reticulate; a pair of lyrifissures present anteriorly.

Male sternites: III with 11 anterior setae, 14 posterior setae and 2 suprastigmal setae on each site, IV with 7 posterior setae and 2 suprastigmal setae on each side, formula for V–XI: 9: 9: 9: 11: 12: 11: 6. Lyrifissures present medially on sternites IV–IX: 3, 2, 2, 2, 3, 1. Anal cone with one pair of small ventral setae. Surfaces scaly-reticulate.

Genital operculum of female ( Fig. 4View FIGURES 1‒4). 11 setae situated on posterior margin of sternite II; surface scaly-reticulate; a pair of lyrifissures present anteriorly. Median and lateral cribrate plates not observed.

Female sternites. III with 19 posterior setae and 2 suprastigmal setae on each side, IV with 9 posterior setae and 2 suprastigmal setae on each side, formula for V–XI: 9: 9: 11: 12: 13: 12: 5. Lyrifissures present medially on sternites IV−IX: 2, 3, 2, 3, 2, 1. Anal cone with one pair of small ventral setae. Surfaces scaly-reticulate.

Palps ( Figs 5–9View FIGURES 5‒9). Trochanter scaly-reticulate; femur ( Fig. 9View FIGURES 5‒9) with a small distinct tubercle on antiaxial side near distal end, scaly-reticulate; patella ( Fig. 9View FIGURES 5‒9) with a small tubercle on dorsoparaxial side near end of pedicel, mostly scaly-reticulate, except for antiaxial face; chelal hand mostly lightly scaly-reticulate, except for the dorsoparaxial face and most of the bases of fingers, which are finely granulate, pedicel distinctly scaly-reticulate. Fixed finger with 95–98 [70–74] acute, heterodentate, mostly contiguous teeth (sometimes irregularly spaced) ( Figs 6, 8View FIGURES 5‒9); holotype with 2 small, antiaxially displaced proximal teeth on left fixed chelal finger ( Fig. 8View FIGURES 5‒9). Movable finger with 97 [78–78] teeth, also acute, heterodentate, mostly contiguous ( Fig. 7View FIGURES 5‒9). Venom apparatus well developed in both fingers; venom duct ( Fig. 5View FIGURES 5‒9) extends along the distal third of both fingers in the right chela, and occupies the distal fourth of both fingers in the left chela [occupies the distal fourth only in the left movable finger]; on the left chela, nodus ramosus situated distally from ist and st (ca. 150 µm and 375 µm, respectively) [ca. 75 µm and 200 µm, respectively]; on the right chela, nodus ramosus situated distally from ist and st (ca. 110 µm and 125 µm) [ca. 25 µm and 75 µm]. Trichobothrial pattern ( Fig. 5View FIGURES 5‒9): ib in far distal half of hand dorsum, near base of fixed finger; ist distal to est, est is slightly proximal to level of st on movable finger (except for the left fixed finger of the holotype, where est is slightly distal to level of st); isb almost equidistant to level of sb and esb; it slightly distal to et; b-sb-st-t almost equidistant.

Legs ( Figs 10–12View FIGURES 10‒12). Leg IV ( Fig. 10View FIGURES 10‒12): subterminal setae of tarsus smooth and acuminate ( Fig. 11View FIGURES 10‒12); some tactile setae present; arolia undivided and a little longer than claws, latter smooth ( Fig. 11View FIGURES 10‒12).

Measurements and proportions as in Table 1.

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Departamento de Geologia, Universidad de Chile