Occidenchthonius espanyoli / Chthonius (Ephippiochthonius) espanyoli

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Tamaño grande, longitud corporal: 1.78-1.88 mm. Troglomorfismo avanzado. Escudo prosómico sin rastro de ojos; sin microsedas preoculares

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Phylum Arthropoda / Subphylum Chelicerata / Classis Arachnida / Ordo Pseudoscorpiones / Subordo Epiocheirata / Superfamilia Chthonioidea / Familia Chthoniidae / Genus Occidenchthonius / Species Occidenchthonius espanyoli – Chthonius (Ephippiochthonius) espanyoli


JUAN A. ZARAGOZA1 & TONI PÉREZ2

1 Departamento de Ecología, Facultad de Ciencias, Universidad de Alicante, E-03080 Alicante, Spain. E-mail: ja.zaragoza@ua.es
2 Grupo de Espeleología de Villacarrillo (G.E.V.). Plaza 28 de Febrero, 5-1ª-2ª. E-23300 Villacarrillo, Jaén, Spain.
E-mail: bioespeleologiaGEV@gmail.com


Localidad típica: Cueva Secreta del Poyo Manquillo, Cazarla, Jaén; Complejo del Arroyo de la Ram51a, Peal de Becerro, Jaén; Sima Jesusín, Horoos de Segura, Jaén.
Descripción Tamaño grande, longitud corporal: 1.78-1.88 mm. Troglomorfismo avanzado. Escudo prosómico sin rastro de ojos; sin microsedas preoculares y con sólo dos macrosedas en el borde posterior. Quelícero con 6-7 sedas en la mano y 1 microseda lateral; tubérculo sedicígero reducido en los machos, prominente y romo en las hembras; sin diente subapical aislado en el dedo móvil. Terguitos 1-VI: 4:4:4:4:6:6 sedas. Coxa 11 con 9-11 espinas, 111 con 5-7. Pedipalpos: mano de la quela deprimida a nivel de los tricobotrios ib-isb, seguida de una baja y redondeada protuberancia distal, más prominente en las hembras; tricobotrio ist marcadamente distal de esb; dedo fijo de la quela con 21-27 dientes puntiagudos, móvil con 15-19 dientes puntiagudos, seguidos de lámina proximal con 8-13 dientes vestigiales redondeados y sin canal hasta la distancia media entre sb y b. Longitudes en mm. y ratios del pedipalpo en los machos, las hembras entre corchetes: fémur 0.99-1.03 (7.6-8.lx) [0.91-0.94 (6.5-7.2x)], patela 0.4-0.41 (2.4-2.5x) [0.37-0.4 (2.4x)], quela lateral 1.37- 1.44 (6.6-7.0x) [1.27-1.29 (5.8-6.5x)], mano lateral 0.54-0.55 (2.6x) [0.50-0.51 (2.3-2.5x)], dedo móvil 0.84-0.88 [O. 76-0. 78], ratio dedo/mano 1.6x [1.5x].


Etymology

The new species is dedicated to the memory of Dr Francesc Español Coll (1907–1999), specialist
in Coleoptera, one of the greatest biospeleologists in the World, invertebrate Curator and later Director of Museo
de Zoología de Barcelona (Museu de Ciències Naturals) for more than 50 years. Dr Español collected a
pseudoscorpion specimen in the Cueva Secreta del Poyo Manquillo in 1953, identified as Neobisium (O.) perezi
and recorded in this paper for the first time.

Diagnosis.

Strongly troglomorphic facies. No eyes or eye-spots. Chelicera with 6 (rarely 7) setae on palm and
one microseta; isolated subapical tooth absent on movable finger; spinneret strongly reduced in males, prominent
and apically rounded in females. Carapace with two macrosetae on posterior margin, without preocular microsetae.
Pedipalp: femur length 0.99–1.03 (7.6–8.1×) (♂), 0.91–0.94 (6.5–7.2×) (♀); chela length 1.37–1.44 (length/depth
6.6–7.0) (♂), 1.27–1.29 (length/depth 5.8–6.5) (♀); fixed finger with 26–27 (♂), 21–22 (♀) teeth; movable finger
with 18–19 (♂), 14–15 (♀) teeth and raised lamina with 8–13 rounded vestigial teeth; trichobothrium ist distinctly
distal of esb.

Description.

Male holotype, followed (when different) by male paratype in parentheses and female paratypes
in square brackets. Large species; strongly troglomorphic; integument depigmented, pale yellowish-brown; weak
hispid granulation on lateral surfaces of ocular and posterior areas of carapace, on cheliceral palm, on base of
paraxial face of pedipalpal femur, on base of movable finger and on dorsodistal surface of pedipalpal hand.

Carapace (Fig. 6) as long as broad or slightly longer than broad, distinctly constricted posteriorly; anterior
margin (Fig. 7) weakly prominent, medially dentate, without epistome. Without eyes or eye-spots. Chaetotaxy: 18
(19) setae, without preocular microsetae, formula: 4:6:4:2:2 (4:6:4:3:2), anteromedial seta 0.12 [0.13] mm long,
ocular seta 0.06 mm. Five lyrifissures in anterior and ocular areas, two in posterior area.
Pedipalpal coxa 5 setae (including 2 on manducatory process), coxa I 3 + 3 marginal microsetae, II 4 + 9–10
(10–11) [10–11] bipinnate coxal spines, III 5 + 6 [5–7] bipinnate coxal spines, IV 6; intercoxal tubercle bisetose.
Chaetotaxy of tergites I–XI: 4:4:4:4:6:6:6:6:6:4:1T2T1. Genital area with 9 setae on sternite II in males and
females; sternite III with genital opening flanked by 8 setae on each side, 4+4 internal glandular setae and (3)7(3)
marginal setae. Chaetotaxy of sternites IV–XI: (2)7(2):7:6:6:6:6:7:0; male paratype with 9 [7–8] marginal setae on
sternite III, IV: 6, V: 6 [7–8], X: 6 [6–7]. Anal cone 0+2 setae.
Chelicera (Figs 8–9) with 6 [6–7] setae and 1 microseta laterally on palm, seta vb 0.05 mm long, microseta
0.035 mm long; seta gl 0.55 [0.56] from base of movable finger. Fixed finger with 11 teeth, two distal teeth
distinctly larger than others, proximally decreasing in size. Movable finger without an isolated subapical tooth (di),
with a large distal tooth and 10 contiguous teeth reduced in size proximally; spinneret in males strongly reduced,
almost absent, prominent and apically rounded in females. Rallum with 11 blades. Serrula exterior with 16 [17–18]
blades, serrula interior with 14 [13] blades.
Pedipalp (Figs 10–12) with femoral chaetotaxy 3:6:3:5:1 [3:6–7:3:5–6:1], four lyrifissures: 1 antiaxial and 3
paraxial. Chelal hand depressed at level of ib-isb, with a low, rounded hump distad of ib-isb in males, slightly more
prominent in females, and a weak ventral hollow just before base of movable chelal finger; chaetotaxy 4:5:4. Fixed
finger with 26 (27) [21–22] pointed teeth, all with dental canals except the two small distal ones, dental row
reaching proximad of trichobothrium sb; third distal tooth from tip modified, little wider than others; four
microtubercles at base; tip of finger with an accessory tooth (td) on antiaxial face; four teeth at level of est/it
occupying 0.1 mm, distance between apices 0.025 [0.025–0.03] mm. Distal half of movable finger with 18 (19)
[14–15] pointed teeth, all with dental canals except the two tiny distal ones; proximal half of finger with slightly
raised lamina with 13 (8) [10–13] rounded vestigial teeth reaching slightly distad of halfway between trichobothria
b and sb, level with coupled sensilla pc, three microtubercles at base; basal apodeme long and apically indented.
Trichobothria as in figs 11–12; ist markedly distal of esb, distance ist to esb 0.06 [0.05–0.08] mm, distance esb to
eb 0.03 [0.03–0.04] mm; distance between st–sb 2.3 (1.8) [2.1–2.2] longer than that between sb–b.

FIGURES 10–12. Chthonius (Ephippiochthonius) espanyoli sp. nov., male holotype. 10, left pedipalp minus chela, dorsal view; 11, left chela, lateral view. Female paratype from Complejo del Arroyo de la Rambla (PB–4), 12, left chela, lateral view. Scale bar 0.2 mm.

Leg IV tactile seta ratios: tibia 0.57 (0.54) [0.54–0.55], basitarsus 0.45 (0.44) [0.40–0.42], tarsus 0.31 [0.27–
0.29].
Measurements and ratios. Male holotype, followed by male paratype from Cueva Secreta del Poyo Manquillo
in square brackets. Body 1.78 [1.88]. Carapace 0.54/0.55 (1.0) [0.59/0.53 (1.1)]. Chelicera palm 0.56/0.25 (2.2)
[0.55/0.25 (2.2)], movable finger 0.28 [0.29]. Pedipalp femur 0.99/0.13 (7.6) [1.03/0.13 (8.1)]; patella 0.40/0.16
(2.4) [0.41/0.17 (2.5)]; chela 1.37/0.20 (6.8) [1.44/0.20 (7.0)], depth 0.21 (6.6) [0.21 (7.0)]; hand 0.54 (2.7) [0.55
(2.7)], length/depth (2.6) [(2.6)]; movable finger 0.84 [0.88]; ratio movable finger/hand 1.6; ratio femur/movable
finger 1.2; ratio femur/carapace 1.3; ratio chela/carapace 1.8 [1.7]. Leg I: femur 0.52/0.08 (6.2) [0.56/0.08 (6.7)];
patella 0.28/0.08 (3.7) [0.27/0.08 (3.6)]; tibia 0.30/0.06 (5.0) [0.33/0.06 (5.5)]; tarsus 0.60/0.05 (11.8) [0.61/0.05
(12.0)]; ratio femur/patella 1.9 [2.1]. Leg IV: femur+patella 0.81/0.27 (3.0) [0.83/0.27 (3.1)]; tibia 0.56/0.11 (5.2)
[0.57/0.11 (5.4)]; basitarsus 0.28/0.08 (3.4) [0.30/0.08 (3.6)]; telotarsus 0.64/0.05 (14.0) [0.66/0.05 (13.3)]; ratio
telotarsus/basitarsus 2.3 [2.2].
Female paratypes from Complejo del Arroyo de la Rambla (PB-4). Body 1.74–1.94. Carapace 0.57–0.59/0.52–
0.55 (1.1). Chelicera: palm 0.53–0.55/0.23–0.25 (2.2–2.3), movable finger 0.27. Pedipalp: femur 0.91–0.94/0.13–
0.14 (6.5–7.2); patella 0.37–0.40/0.15–0.17 (2.4); chela 1.27–1.29/0.20–0.21 (5.9–6.6), depth 0.20–0.22 (5.8–6.5);
hand 0.50–0.51 (2.4–2.6), length/depth (2.3–2.5); movable finger 0.76–0.78; ratio movable finger/hand 1.5; ratio
femur/movable finger 1.2; ratio femur/carapace 1.5–1.7; ratio chela/carapace 2.2. Leg I: femur 0.48–0.50/0.08
(6.0–6.2); patella 0.25–0.26/0.07 (3.7–3.8); tibia 0.25–0.28/0.06 (4.5–4.9); tarsus 0.54–0.55/0.05 (11.1–11.4); ratio
femur/patella 1.9–2.0. Leg IV: femur+patella 0.70–0.72/0.24–0.25 (2.9); tibia 0.49–0.51/0.10–0.11 (4.9); basitarsus
0.25/0.08 (3.1–3.4); telotarsus 0.52–0.56/0.05 (10.7–12.4); ratio telotarsus/basitarsus 2.1–2.2.


Distribution.

Andalusia, Spain.

Remarks.

Up to now it has not been possible to obtain specimens of both sexes in the same cave. On the basis
of the obtained data, we consider the different populations to belong to the same species, but this remains to be
verified by the collection of new specimens.
The new species shares with C. (E.) cazorlensis, C. (E.) perezi, Chthonius (E.) torremarinae Carabajal
Márquez, García Carrillo & Rodríguez Fernández, 2012 (Almería, Spain) (Carabajal Márquez et al. 2012),
Chthonius (E.) ventalloi Beier, 1939 (Valencia, Spain) (Zaragoza 1985a) and C. (E.) verai (Alicante, Spain)
(Zaragoza 1985b) the following characteristics: eyeless, raised lamina present on movable chelal finger, without
isolated subapical tooth on movable finger of chelicera, only two macrosetae on posterior margin of carapace and
absence of preocular microsetae. C. (E.) espanyoli sp. nov. shares with C. (E.) verai a long pedipalp femur (about
0.90–1.00 mm) and chela (about 1.20 mm or more); C. (E.) espanyoli has an even slenderer chela (male 6.6–7.0,
female 5.8–6.5) than C. (E.) verai (male 6.1, female 5.7–6.0); C. (E.) espanyoli has a higher number of teeth on the
fixed and movable fingers, with both dental rows reaching proximad of trichobothrium sb, as opposed to that of the
fixed finger row being level with sb, with only that of the movable finger reaching proximad of sb in C. (E.) verai.


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