Neobisium (Ommatoblothrus) perezruizi, Zaragoza, Juan A. & Pérez, Toni, 2013

Zaragoza, Juan A. & Pérez, Toni, 2013, Hypogean pseudoscorpions (Arachnida) from Jaén province (Andalusia, Spain), with descriptions of four new species and a new synonymy, Zootaxa 3700 (2), pp. 201-225 : 219-220

Neobisium (Ommatoblothrus) perezruizi sp. nov.

( Figs 27–33 )

Type material. Holotype ♂ (DEUA: 20046), Spain, Andalusia, Jaén province, Peal de Becerro, Complejo del Arroyo de la Rambla (PB-4) (37º48′1.22″N, 2º53′36.65″W; 1000 m.a.s.l.), 04.XII.2011. Paratypes: 1 T (MCNB: 2013-2544 MZB), 1 D (DEUA: 20055), same details as holotype. All specimens lgt. G.E.V.

Etymology. The species is dedicated to Antonio Pérez Ruiz, ex-president and founding member of G.E.V., to honour his great contribution to our knowledge of the speleology and hypogean fauna of Andalusia, particularly of Jaén.

Diagnosis. Troglomorphic facies. No eyes or eye-spots. Carapace with about 20 setae, posterior margin probably with 4–6 setae (5 in holotype). Tergites I–IV with 6:6:6:9 setae. Male cheliceral spinneret a low, broad dome. Pedipalp femur ratio about 7.0, femur as long as movable finger; chela+ ratio 7.5; hand+ ratio 3.4, widest at middle, ratio movable finger/hand+ 1.4; movable finger teeth recognizable in whole dental row; trichobothrium ist distad middle of the finger.

Description of male. Medium-sized Ommatoblothrus of moderate troglomorphic facies. Opisthosoma elongate. Opisthosoma and legs yellowish, carapace, chelicerae and pedipalps reddish brown.

Carapace ( Fig. 27 ) longer than broad. Without eyes or eye-spots. Epistome long and acute ( Fig. 28 ). Chaetotaxy 21 setae, formula 4:6:6:5. Four microlyrifissures on ocular zone, four between median and posterior zones.

Manducatory process with 4 setae. Anterolateral process of coxa I with simple tooth shape, long and apically pointed; medial process straight with 2–3 denticles ( Fig. 29 ). Pedipalpal coxa with 8 setae, pedal coxa I with 6–7, II 5–6, III 7–8, IV 10–11.

Tergal chaetotaxy I–X: 6:6:6:9:9:9:9:9:8:7. Male genital area with 11 short setae on sternite II; sternite III with 15 setae behind genital opening and (3)11(3) setae on the posterior margin of the sternite. Sternal chaetotaxy IV–X: (3)13(3):13:13:13:13:12:10. Segment XI 8 setae. Anal cone with two dorsal and two ventral setae.

Chelicerae ( Figs 30–31 ) with 7 setae on palm; seta gl 0.62 from base of movable finger. Spinneret a low, prominent sclerotic dome. Fixed finger with 9 teeth; movable finger with 6 teeth, one large and blunt (probably worn) medial tooth, others medium or small, dental row ending just proximad subgaleal seta. Rallum with 8 blades, all smooth except distal one, which is unilaterally pinnate on anterior face and situated on a raised lamina, distinctly separated from other blades, basal blade very small. Serrula exterior with 32 blades, serrula interior 27 blades.

Pedipalps ( Figs 32–33 ) completely smooth. Lyrifissures as illustrated. Femur with one tiny tubercle at middle of antiaxial face, one distal glandular pore present. Patella pedicel with two micropores at base and one in distal portion. Chela markedly curved, hand nearly parallel sides at middle area in dorsal view, maximum width at middle; pedicel bears four dorsal micropores; two glandular pores on antiaxial face, close to finger base. Fixed finger with 119 teeth, dental row reaching base of finger; nodus ramosus short, at level of 4th distal tooth; trichobothrium it slightly distad et; trichobothrium ist closer to apex of finger than to base; distance between trichobothria ib and ist 1.2 times than that between ist and apex; distance between trichobothria isb and ist 5.6 times than that between isb and ib. Movable finger with 112 teeth, dental row nearly reaching base of finger; distance between trichobothria sb and st 2.0 times that between sb and b. One sensillum near tip of both fingers; two separated sensilla between trichobothria sb and st.

Claws of legs I and IV with a tiny dorsal tooth proximad of middle, subterminal setae with two rami, that of leg IV total length 0.084 mm, larger ramus 0.043 mm, shorter ramus 0.024 mm, both with tiny spines. Leg IV tibia TS 0.43, basitarsus TS 0.07, telotarsus TS 0.38.

Measurements and ratios. Body 2.65. Carapace 0.87/0.76 (1.2). Chelicera: palm 0.65/0.33 (2.0), movable finger 0.41. Pedipalp: trochanter 0.70/0.25 (2.8); femur 1.66/0.24 (6.9); patella 1.32/0.27 (4.9), pedicel 0.38, club 0.94 (3.5), ratio club/pedicel 2.5; chela+ 2.74/0.37 (7.5), chela - 2.58 (7.1); hand+ 1.23 (3.4), hand - 1.07 (2.9); movable finger 1.66; ratio movable finger/hand+ 1.4; ratio chela+/carapace 3.1; femur/carapace 1.9; femur/movable finger 1.0; femur/patella 1.3; patella/hand+ 1.1. Leg I: femur 0.96/0.14 (6.7); patella 0.60/0.12 (4.9); tibia 0.65/0.10 (6.5); basitarsus 0.45/0.08 (5.6); telotarsus 0.65/0.10 (6.7); ratio femur/patella 1.6; telotarsus/basitarsus 1.4. Leg IV: femur+patella 1.46/0.29 (5.1); tibia 1.28/0.17 (7.5); basitarsus 0.66/0.13 (4.9); telotarsus 0.84/0.12 (7.1); ratio telotarsus/basitarsus 1.3.

Tritonymph (data coinciding with holotype omitted). Carapace with 22 setae, formula 4:6:6:6; epistome short and acute. Pedipalpal coxa with 7 setae, pedal coxa I 4, II 5, III 5, IV 6. Tergal chaetotaxy I–X: 6:6:7:6:6:8:7:8:7:7. Sternite II with 4 microsetae; sternal chaetotaxy III–X: (2)7(2):(2)9(2):11:12:11:10:10:9. Cheliceral palm with 6 setae; spinneret slightly more prominent than in male; fixed finger with 14 teeth; movable finger with 8 teeth, three teeth large and close together, the medial one even longer than the others. Fixed chelal finger with 91 teeth; movable finger with 88 teeth, decreasing in size in basal half but still well developed and much more easily recognized than in male; trichobothrium it distinctly distad of et; trichobothrium ist only slightly closer to apex of finger than to base; distance between trichobothria ib and ist 0.9 times that between ist and apex. Leg IV tibia TS 0.36, basitarsus TS 0.02, telotarsus TS 0.38.

Measurements and ratios: Body 2.80. Carapace 0.71/0.60 (1.2). Chelicera: palm 0.51/0.27 (1.9), movable finger 0.32. Pedipalp: trochanter 0.48/0.21 (2.3); femur 1.16/0.20 (5.8); patella 0.84/0.23 (3.7), pedicel 0.25, club 0.59 (2.6), ratio club/pedicel 2.4; chela+ 1.98/0.32 (6.3), chela - 1.89 (6.0); hand+ 0.82 (2.6), hand - 0.73 (2.3); movable finger 1.19; ratio movable finger/hand+ 1.5; ratio chela+/carapace 2.8; femur/carapace 1.6; femur/movable finger 1.0; femur/patella 1.4; patella/ hand+ 1.0. Leg I: femur 0.63/0.12 (5.3); patella 0.39/0.10 (3.8); tibia 0.44/0.9 (4.9); basitarsus 0.30/0.07 (4.3); telotarsus 0.46/0.07 (6.7); ratio femur/patella 1.6; telotarsus/basitarsus 1.5. Leg IV: femur+patella 1.04/0.21 (5.0); tibia 0.85/0.11 (7.5); basitarsus 0.41/0.09 (4.6); telotarsus 0.60/0.08 (7.5); ratio telotarsus/basitarsus 1.5.

Distribution. Andalusia, Spain.

Remarks. Neobisium (O.) perezruizi belongs to the Spanish group of species with well developed teeth in the basal half of the dental row on the movable chelal finger, usually 6 or less setae on posterior margin of carapace and a large tooth on the movable cheliceral finger, but it differs of all them in the chela+ ratio (4.97 in Neobisium (O.) rodrigoi Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2000, 6.0 in N. (O.) hiberum Beier, 1931 and 9.83 in N. (O.) tinauti Carabajal Márquez, García Carrillo & Rodríguez Fernández, 2011). The geographically closest species, N. (O.) perezi , shares a regular dental row on cheliceral movable finger, but is more robust than the new species (ratios male chela hand+ 2.7–2.8 and chela+ 6.0–6.6, versus hand+ 3.4 and chela+ 7.5 in N. (O.) perezruizi and has a different chelal hand shape.

Figures

FIGURES 27 – 33. Neobisium (Ommatoblothrus) perezruizi sp. nov., male holotype. 27, carapace; 28, partial view of anterior margin of carapace, showing epistome; 29, anterior and medial processes of right coxa I; 30, left chelicera; 31, partial view of movable finger of left chelicera; 32, right pedipalp, minus chela, dorsal view; 33, right chela, dorsal view. Scale bars (in mm): 0.1 (Figs 28, 29, 31), 0.3 (Fig. 30), 0.5 (Figs 27, 32, 33).