Spinopilar jocheni, Kury & Araujo, 2021

Kury, Adriano B. & Araujo, Débora C., 2021, On Spinopilar from Rio de Janeiro state with description of three new species (Opiliones, Laniatores, Cryptogeobiidae), Zootaxa 4984 (1), pp. 148-181 : 165-166

Spinopilar jocheni spec. nov.

Figs 4A , 10–14

Type material. BRAZIL: Rio de Janeiro: Holotype ♂ ( MNRJ 2277 ), Rio de Janeiro, Barra de Guaratiba , Pedra da Tartaruga, 23° 4’18.77”S, 43°33’9.20”W [3 m elevation], A.P.L. Giupponi leg. 24.4.2010 . Paratypes: 2 ♂ ( MNRJ 7115 ) Rio de Janeiro, Barra de Guaratiba, Pedra da Tartaruga , 23° 4’19.29”S, 43°33’11.28”W [17 m elevation], hillside with almond trees, A.B. Kury, A.P.L. Giupponi & G. Miranda leg. 20.8.2010.

Etymology. Species name is a noun in the genitive case, after the distinguished German arachnologist Jochen Martens, by occasion of his 80th birthday.

Diagnosis. S. jocheni spec. nov. belongs to the group of typical Spinopilar , with preocular mound high, leaning forward ( Figs 10B, C ). It may be distinguished from all other Spinopilar by the scutal areas entirely unarmed ( Fig. 10A ). Furthermore, it has ocularium low and unarmed (as in S. armatipes , S. insignitus , S. moria ), contrasting with most other species which have ocularium high campaniform with erect spine.

Description. Male (holotype). Measurements: CL = 0.68, CW = 1.03, AL = 1.00, AW = 1.43. Fe I = 1.0, Fe II = 1.8, Fe III = 1.2, Fe IV = 1.7.

Dorsum ( Figs 4A , 10A–C ). Dorsal scutum bell-shaped: abdominal scutum wider than carapace with sides subparallel and with almost imperceptible posterior constriction. Carapace with well-marked crescent-shaped groove, entirely smooth; lateral ridges deep; preocular mound moderately high, with scaly tegument. Ocularium low, narrow elliptical, situated in the middle of the carapace, entirely unarmed. Lateral margins of scutum with very few setiferous tubercles only at area II. Mesotergum divided into 4 areas by deep and wide substraight grooves. Scutal areas I to V, free tergites I to III and anal operculum entirely unarmed.

Venter ( Figs 10D , 11A–F ). Coxae I densely covered by setiferous tubercles, Cx II less so. Coxae III–IV smooth, only with minute granules. Free sternites smooth. Cx I to III arched, transversal to main body axis; Cx II curved around Cx I, as wide as coxae I and III, in situ much longer than Cx III. Cx II and III delimit a narrow sternum. Maxillary lobe of Cx II as a small triangle. Cx I movable. Cx II linked to Cx III by only one pair of large lateral tubercular bridges; Cx III linked to Cx IV by four pairs of large lateral tubercular bridges. Cx IV slanted, larger than all others combined. Stigmatic area roughly Y-shaped, only faintly separated from Cx IV, fused to sternite II, with lateral grooves highlighting the stigmata ( Figs 10D , 11A ). Posterior margin of complex stigmatic area + sternite II without median lobe. Stigmata small, rounded and free ( Fig. 11B ). Cx IV, Tr IV and stigmatic area complex forming a ventral complex of 3 overlaid apophyses as follows: (1) Cx IV has a weakly biramous apophysis, mesal branch not projected, applied against stigmatic apophysis and ectal branch as an elongate fasciolate hyaline truncated apophysis (FAp, sensu Kury 2014) applicable against Tr IV ( Figs 11 B, D ); (2) stigmatic area has a robust lateral tongueshaped protuberance slightly projected in the middle ( Fig. 11D ); (3) Tr IV (densely covered by scaly tubercles) has a ventro-mesal apical stout but short apophysis, not reaching middle part of protuberance 2, and in mid-length with a secondary branch as a FAp, similar to corresponding FAp of Cx IV ( Figs 11B–E ). Tr IV furthermore has a cluster of 5 meso-basal very thick striated setae (trochanteral PTC, Figs 11E–F ) and a secondary cluster of two such setae associated with FAp ( Figs 11E–F ).

Chelicera/Pedipalp ( Figs 12A–H ). Basichelicerite with well-developed bulla, separated from peduncle by a narrow waist. Its mesal surface covered with patches of denticles. Cheliceral hand weak, monomorphic. Pp Tr with 1 large ventral megaspine, Fe with 2 small megaspines, Pa unarmed. Pp Fe cylindrical, only gently convex dorsally and moderately compressed, with only a few mesal wrinkles in the place of the stridulatory organ. Spination of Pp cage: Ti mesal IiIi, ectal IÎi, Ta mesal IiIi, ectal IiIi.

Legs ( Figs 4A , 10A–C , 13A–H ). Cx IV: well-developed, expanding laterally and posteriorly to barely reach scutal area IV, armed with a distal prodorsal spiniform apophysis and retroventral FAp. Tr IV: extremely robust, armed with a huge recurved retrolateral truncated apophysis bearing inner FAp and retrolateral PTC formed by five striated setae. Fe IV: cylindrical, substraight, almost devoid of tubercle rows, except for a few dorsal and a few retrolateral ones and one larger proventral. Ti IV: thickened, more especially so on distal half, with a pair of retroventral and proventral spurs. Mt IV: only very subtly thickened in basal fourth. Tarsal counts: 5(3)/6(3)/5/5.

Genitalia ( Figs 14A–I ). Distal part of truncus abruptly bent as a botuliform oblique malleus (so that original dorsal surface is now apical and original apical is now ventral) and an erect large lamina parva (LP). Well-developed hyaline button present at dorsal transition zone between truncus and malleus. Lamina parva prismatic, subrectangular (in ventral view) with rounded corners. Dorsal accessory plate of glans (DAPG) roughly rounded pentagonal in dorsal view, folded to embrace the glans. Nine pairs of macrosetae (MS) A to E arranged as follows: MS A1 stout, inserted on latero-apical surface of malleus, close to the base of LP. MS A2 stout, inserted on apical surface of malleus, close to the base of LP. MS B1 as strong as A1–A2, located in the middle of latero-apical surface of malleus, next to A1. MS C1–C3 short, striated, inserted close to each other, located on the ventro-latero-distal edge of LP. MS D1 very short, located of the lateral surface of LP, close to C3. MS E1–E2 similar in size to MS C, forming a quadrangle on ventro-distal surface of LP, E2 much larger than E1. Follis short, but distally expanded into a folded DAPG. Stylus smooth and simple, without head (but with tapering apex), slight curved. Skirt hemispherical, without an axis, radiating in dorsal view around a hollow center, with deeply serrate margins

Figures

FIGURES 4A–C. Spinopilar spp., males, habitus, dorsal. A Spinopilar jocheni from Pedra de Guaratiba (MNRJ 7115). B Spinopilar martialis from Macaé (MNRJ 8852) C Spinopilar magistralis from Búzios (MNRJ 18984). Scale bars: 1 mm.

FIGURES 10A–F. Spinopilar jocheni spec. nov., ♂ paratype (MNRJ 7115) from Pedra de Guaratiba. A–D Habitus (A dorsal, B lateral, C panoramic, including Fe IV and pedipalps, lateral, D ventral). E Right side border of dorsal scutum at carapace, showing ozopore. F Scutal groove, between carapace and area I, showing tegument. Scale bars: 1000 μm (C), 500 μm (A, B, D), 50 μm (E, F).

FIGURES 11A–F. Spinopilar jocheni spec. nov., ♂ paratype (MNRJ 7115) from Pedra de Guaratiba (A–B, D–F ventral, C dorsal). A Sternal region and Cx I–III. B Cx–Tr IV & stigmatic area. C Cx–Tr IV & surrounding region. D–F Detail of junction Cx-Tr-stigmatic area, showing lobes (colorized) (E greater magnification showing fasciolate hyaline apophyses, F detail of bundle of enlarged setae). PTC—proximal trochanteral cluster. Scale bars: 200 μm (A, B), 100 μm (C, D), 50 μm (E), 10 μm (F).

FIGURES 12A–H. Spinopilar jocheni spec. nov., ♂ paratype (MNRJ 7115) from Pedra de Guaratiba. A–E Left Chelicerae, isolated basichelicerite (A ventro-ectal, B ectal, C hand, ectal, D hand, fronto-apical, E hand, ventro-ectal). F–H Left Pedipalp (F ectal, G mesal, H detail of Fe, meso-apical). Scale bars: 200 μm (F), 100 μm (A, B, C, D, E, G, H).

FIGURES 13A–H. Spinopilar jocheni spec. nov., ♂ paratype (MNRJ 7115) from Pedra de Guaratiba. A Free tergites & right Fe–Pa, dorsal. B Left Fe IV, prodorsal. C Right Ti IV, ventrolateral. D Ta IV, ventrolateral. E Left leg I, retrolateral. F Left leg II, retrolateral. G Left leg III, retrolateral. H Left leg IV, retrolateral. Scale bars: 500 μm (A, E, F, G, H), 200 μm (B, C), 100 μm (D).

FIGURES 14A–I. Spinopilar jocheni spec. nov., ♂ paratype (MNRJ 7115), genitalia, distal part (A dorsal, B lateral, C apical, D ventro-latero-apical, showing conformation of glans, E detail of glans, dorsal, F same as D, detail, G ventral, panoramic, H same as G, detail, I stylus with skirt, lateral).A–E—macrosetae of distal truncus, DAPG—dorsal accessory plate of glans. Scale bars: 50 μm (A, B, G), 20 μm (C, D, H), 10 μm (E, F, I).