Stethorrhagus mandrillus, Xavier & Brescovit & Bonaldo, 2025

Stethorrhagus mandrillus sp. nov.

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Figs 15–17 View Fig View Fig View Fig , 49 View Fig

Diagnosis

Males of S. mandrillus sp. nov. resembles those of S. tremarctos sp. nov. by the glabrous dVL and AS large, laminar, shifted dorsally ( Figs 13A–C View Fig , 14A–B View Fig , 16A–C View Fig , 17A–B View Fig ). They can be readily distinguished by the AS diamond-shaped in retrolateral view, by the absence of a SeRP and by the VTA bulging ( Figs 16A–C View Fig , 24A–B View Fig ) ( AS triangular in retrolateral view, embolus inserted between SePP and SeRP and VTA not bulging in S. tremarctos – Figs 13A–C View Fig , 14A–B View Fig ). Females resemble those of S. chalybeius by the anterior margin of the CO delimited by a protruding lip, differing by the lip being entire ( Fig. 16D View Fig ), whereas the lip is divided into two humps in S. chalybeius ( Bonaldo & Brescovit 1994: fig. 16d).

Etymology

The specific name is a noun in apposition in reference to the primate genus Mandrillus Ritgen, 1824 , since the general conformation of the epigynum (as in Fig. 16D View Fig ) resembles a mandrill monkey head in frontal view.

Material examined

Holotype

ECUADOR • ♂; Napo, Yanayacu, Cantón Quijos ; 00°35′57.8″ S, 77°53′25.3″ W; elev. 2132 m; 23–30 Nov. 2009; A.B. Bonaldo leg.; QCAZI 280515 .

GoogleMaps

Paratypes

ECUADOR • 1 ♂; same data as for holotype; MPEG 40001 View Materials GoogleMaps • 1 ♀; same data as for holotype; QCAZI 280516 GoogleMaps • 1 ♀; same data as for holotype; MPEG 40002 View Materials . GoogleMaps

Description

Male ( holotype – QCAZI 280515)

COLORATION. Carapace orange-brown ( Fig. 15A View Fig ). Chelicerae orange. Endites, labium and sternum yellow. Legs yellow with distal area of patellae, tibiae and metatarsi gray. Abdomen dark gray dorsally and cream ventrally ( Fig. 15A View Fig ). Sternum with deep sternal excavations ( Fig. 15C View Fig ).

MEASUREMENTS. Total length 6.00. Carapace 2.96 long, 2.25 wide. Clypeus 0.28. Leg measurements: I: femur 2.49/ patella 1.07/ tibia 2.07/ metatarsus 1.94/ tarsus 1.27/ total 8.84; II: 2.24/ 0.99/ 1.92/ 1.85/ 1.26/ 8.26; III: 1.78/ 0.82/ 1.48/ 1.87/ 1.03/ 6.98; IV: 2.55/ 1.02/ 2.13/ 2.64/ 1.18/ 9.52. Eye diameters: AME 0.19, ALE 0.17, PME 0.15, PLE 0.16. Chelicerae 1.31 long, with three promarginal teeth and four retromarginal denticles.

LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v2-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v0-1r-1r; metatarsus d0, p0, r0, v2-2-0. III – femur d1-1-1, p0, r0; tibia d0, p1-1-0, r0-0-1, v1p-2-2; metatarsus d0, p0-1-1, r0-1-1, v2-2-1. IV – femur d1-1-1, p0-0- 1, r0-0-1; tibia d0, p1-1-0, r1-1-0, v1p-1p-2; metatarsus d0, p1-1-0, r1-1-0, v2-2-1.

PALP. Retrolateral surface of femur and patella with cluster of modified hairs, vVL with four modified hairs on apex, dVL glabrous and not protruding, AS diamond-shaped in retrolateral view and shifted dorsally, DL reduced, spermophor situated prolaterally, SeRP absent, TP1 short, conical, situated on distal fold of spermophor, TP2 absent, embolus short and slightly curved in retrolateral view, VTA longer than broad in ventral view ( Figs 13A–C View Fig , 14A–B View Fig ).

Female ( paratype – MPEG 40002)

COLORATION. As in male, except labium and endites orange, sternum yellow with brown borders ( Fig. 15B View Fig ). Sternum with sternal excavations smaller than the male ( Fig. 15D View Fig ).

MEASUREMENTS. Total length 5.20. Carapace 2.82 long, 2.11 wide. Clypeus 0.24. Leg measurements: I: femur 2.26/ patella 0.88/ tibia 1.84/ metatarsus 1.80/ tarsus 1.20/ total 7.98; II: 2.21/ 0.85/ 1.78/ 1.74/ 1.16/ 7.74; III: 1.92/ 0.84/ 1.36/ 1.60/ 0.83/ 6.55; IV: 2.30/ 0.85/ 1.91/ 2.19/ 1.07/ 8.32. Eye diameters: AME 0.19, ALE 0.17, PME 0.16, PLE 0.16. Chelicerae 1.26 long, with three promarginal teeth and four retromarginal denticles.

LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1p-2-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0, r0; tibia d0, p0, r0, v1r-1r-0; metatarsus d0, p0, r0, v2-2-0. III – femur d1-1-0, p0, r0; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p0-1-1, r0-1-1, v2-2-1. IV – femur d1-1-0, p0, r0; tibia d0, p1-1-0, r1-1-0, v1p-2-2; metatarsus d0, p1-1-0, r1-1-0, v1p-2-1.

EPIGYNUM. Copulatory opening circular, situated posteriorly in relation to spermathecae, anterior margin not delimited and depressed, depression anterior to CO deep, triangular, VEP present, PVP covering up the first half of SI, wider than long ( Figs 13D–E View Fig , 14C–D View Fig ).

Distribution

Known only from the type locality ( Fig. 49 View Fig ).