Corythalia ricti Bayer 2020, sp. nov.

Corythalia ricti Bayer, sp. nov.

Figs 15 A–B, 57E, 64H, 68E

urn:lsid:zoobank.org:act: 1212C70E-84A1-48E6-8872-0083D3A425E9

Type material. Holotype: ♂, GUYANA: East Berbice-Corentyne: Canje-Ikuruwa River, Forest Savanna, ca. 57°30’W, 05°42’N, about 25 m a.s.l.; George Bentley leg. Aug.–Dec. 1961, AMNH-IZC 00327077.

Etymology. The specific name refers to the RTA of the holotype which resembles an open mouth (of a monstrous fantasy creature) with several pointed teeth (Latin “rictus/rictum” means “widely open mouth”); noun in genitive case.

Diagnosis. Males distinguished from those of all other Corythalia species by the combination of the following characters: embolus base (EB) with prolateral extension in form of an elongated bulge; width of EB circle clearly more than half the width of tegulum, almost 2/3; embolus (E) distally pointed and with prolateral direction (Figs 15A, 64H). RTA in retrolateral view with distinct bend, distal part directed disto-ventrally and being clearly shorter and narrower than proximal part (Figs 15B, 68E), RTA in ventral view subdistally with broad and deep incision exhibiting several teeth (Figs 15A, 64H).

Description. Male: total length 6.3, carapace length 3.0, maximal carapace width 2.0, width of eye rectangle 1.8, opisthosoma length 2.5, opisthosoma width 1.7, fovea length 0.23. EYES: AME 0.58, ALE 0.35, PME 0.09, PLE 0.30, AME–AME 0.04, AME–ALE 0.04, PME–PME 1.52, PME–PLE 0.26, ALE–PLE 0.68, PLE–PLE 1.24, clypeus height at AME 0.28, clypeus height at ALE 0.66. Cheliceral furrow with 1 promarginal and 1 retromarginal teeth. SPINATION: palp without spines. Legs: femur I 1500, II–IV 1600; patella I 1000, II–IV 1010; tibia I 3005, II 3004{3015}, III–IV 3133; metatarsus I 2014, II 2024 {2025}, III 3134, IV 3144. MEASUREMENT OF PALP AND LEGS: palp 2.4 [0.8, 0.4, 0.2, 1.0], I 4.5 [1.4, 0.8, 1.0, 0.8, 0.5], II 4.6 [1.5, 0.8, 1.0, 0.8, 0.5], III 5.4 [1.8, 0.8, 1.1, 1.2, 0.5], IV 5.4 [1.7, 0.7, 1.2, 1.2, 0.6]. LEG FORMULA: 3&421 (legs III & IV with exactly the same length). COPULATORY ORGAN: embolus (E) quite short, pointed and distal section directed prolaterally; E about as long as 1/2 the width of tegulum (T) (Figs 15A, 64H). Embolus base (EB) broad (EB circle almost as broad as 2/3 the width of T), located centro-distally at T; T relatively short, but proximal tegulum lobe (PTL) distinct and with small prolateral lobe; T with double stacked S-shaped spermduct visible in retrolateral 1/2 to 2/3 (Figs 15A, 64H). Cymbium relatively short and broad, distally conically converging and at distalmost section rounded to egg-tip-shaped. Palpal tibia short (length about 2/3 the width), with indistinct and flat ventral tibial bump (Figs 15 A–B, 64H, 68E). RTA quite broad, subdistally with broad and deep incision exhibiting several teeth (Figs 15A, 64H), in retrolateral view even broader and with distinct bend, distal part directed disto-ventrally and being clearly shorter and narrower than proximal part (Figs 15B, 68E). COLOURATION: see genus description for conservative aspects. Carapace dark red-brown (Fig. 57E). Legs almost completely unicoloured dark brown to red-brown, except for tarsi and coxae & trochanteres being lighter (Fig. 57E). Opisthosoma like noted in genus description under general dorsal colouration, except for chevron-like patch in central band missing (Fig. 57E).

Female: unknown.

Remarks. The short, relatively narrow, distally pointed embolus with prolateral direction and the relatively broad and short tegulum with a distinct proximal lobe exhibiting a prolateral lobe are similar to C. antepagmenti sp. nov. and C. drepane sp. nov., so we expect a quite close relationship between these two species and C. ricti Bayer, sp. nov.

Distribution. Known only from the type locality in East Berbice-Corentyne, Guyana.