Chthonius

Gardini, Giulio, 2013, A revision of the species of the pseudoscorpion subgenus Chthonius (Ephippiochthonius) (Arachnida, Pseudoscorpiones, Chthoniidae) from Italy and neighbouring areas, Zootaxa 3655 (1), pp. 1-151: 33-35

publication ID

http://dx.doi.org/10.11646/zootaxa.3655.1.1

publication LSID

lsid:zoobank.org:pub:FC302AA5-49CC-41B0-9A66-23C11AB4EBAE

persistent identifier

http://treatment.plazi.org/id/03DE87C1-FFCB-F941-6B99-FD461CC9A18C

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Plazi

scientific name

Chthonius
status

 

[ Chthonius   (E.) corsicus   Callaini, 1981]

( Figs 50–53 View FIGURES 50 – 53 )

Chthonius corsicus Callaini 1981: 315   , figs IIIa –f, IV.

Type locality: France, Corsica, Dept. Haute-Corse, Bastia, San-Martino-di-Lota (42 ° 43 ʹ 26 ʺN 9 ° 27 ʹ 21 ʺE).

Distribution. Corsica.

Diagnosis (3). An oculated epigean Chthonius   ( Ephippiochthonius   ) from Corsica that differs from other species of the C. fuscimanus   group in the following combination of characters: movable cheliceral finger without isolated subapical tooth (di); fixed chelal finger at level of est-it with 4 teeth occupying 0.1 mm (distance between successive apices 0.026 mm); length of chela 0.655–0.67 (3), length of pedipalpal movable finger 0.38–0.39 (3); ratio of pedipalpal femur/carapace 1.35–1.4 (3).

Material examined. FRANCE — Corsica: 1 3, Bastia, near Erbalunga, 22.V. 1982, S. Zoia & A. Torchia leg., Quercus ilex   wood on limestone.

Description of adult (3; Ƥ unknown). Integument with weak pigmentation, carapace, tergites, chelicerae and pedipalps pale brown; evident hispid granulation on lateral surface of carapace, on cheliceral palm and on base of movable chelal finger. Carapace 1.05–1.1 times as long as broad, subquadrate, posteriorly weakly constricted; anterior margin (fig. 50) between median macrosetae with spaced out denticles, without epistome; ocular area as in fig. 51, anterior eyes with fairly convex lens (diameter 0.028 mm), posterior eyes reduced to a smooth cuticular area; distance from anterior eyes to anterior margin of carapace 0.03 mm; chaetotaxy mm 4mm: 6: 4: 2: 2 (18), macrosetae fine; length of anteromedian macrosetae 0.08 mm. Chaetotaxy of tergites I –X 4: 4: 4: 4: 6: 6: 6: 6: 6: 4. Chaetotaxy of sternites II –X 10:(3) 8 (3):(2) 7 (2): 7 o 8: 6: 6: 6: 6: 7; genital opening of males flanked by 6–8 setae on each side. Chelicerae (figs 52) 2.1–2.4 times as long as broad, palm with 6 setae and 1 or 2 microsetae laterally; fixed finger with 6–7 subequal teeth and 5–6 proximal microtubercles; movable finger with 5 teeth proximally reduced in size and 3–4 proximal microtubercles, isolated subapical tooth (di) absent; gl ratio 0.59; spinneret weakly raised; rallum with 11 blades; serrulae interior and exterior respectively with 12 and 14 blades. Coxal setae: pedipalp 5 (including 2 on manducatory process), I 3 + 3 marginal microsetae, II 4, III 5, IV 6; coxa II with 7–9 coxal spines, coxa III with 4–5 coxal spines; intercoxal tubercle bisetose. Pedipalp (fig. 53): femur 5.6 –6.0 times as long as broad, with hispid granulation basally; chela 5.5–5.8 times as long as deep; hand of chela 2.4–2.5 times as long as deep, weakly depressed at level of ib-isb, without hump distad of ib-isb; fixed chelal finger with 12–13 triangular teeth with dental canals, the two distal teeth smaller, the first proximal tooth smaller and with tip rounded; base of fixed finger with 6–7 microtubercles; tip of fixed finger with a modified accessory tooth (td) on antiaxial face; fixed chelal finger at level of est-it with 4 teeth occupying 0.1 mm (distance between successive apices 0.026 mm); distal half of movable chelal finger with 7 upright, triangular teeth, the proximal one smaller, with dental canals; proximal half of movable finger with thick marginal lamina weakly undulated, with vestiges of 3 teeth back to sb; coupled sensilla pc at level with sb; trichobothria as in fig. 53, ist a little distad of the line eb-esb; basal apodeme of movable finger strongly sclerotized, squat, apically truncate; ratio of movable finger/hand of chela 1.3–1.35; ratio of pedipalpal femur/movable finger 1.2–1.3; ratio of pedipalpal femur/carapace 1.35–1.4.

Measurements (in mm). Body length 1.20–1.26. Carapace 0.35 × 0.32–0.33 (0.29 anteriorly). Chelicerae 0.27– 0.28 × 0.11–0.137, movable finger length 0.14–0.15. Pedipalp: femur 0.47–0.48 × 0.08–0.084; chela 0.655–0.67 × 0.115–0.12; hand length 0.29; movable finger length 0.38–0.39.

Remarks. Among the species of the Chthonius fuscimanus   group, C. corsicus   is related to C. giustii   and C. siscoensis   , both from Corsica. It differs from the epigean C. giustii   in its larger size [length of chela 0.655–0.67 mm (3) in C. corsicus   , 0.33–0.36 mm (3) in C. giustii   ], the shape of pedipalpal hand (weakly depressed at level of ibisb with a rectangular profile in C. corsicus   , depressed at level of ib-isb with a square profile in C. giustii   ) and the pedipalps being more slender [chela 5.5–5.8 (3) times as long as deep in C. corsicus   , 4.8–5.15 (3) in C. giustii   ]. C. corsicus   differs from the hypogean C. siscoensis   in many troglomorphic characters.

The above redescription of C. corsicus   incorporates the original one of Callaini (1981).