Corythalia protensa, Bayer & Höfer & Metzner, 2020

Bayer, Steffen, Höfer, Hubert & Metzner, Heiko, 2020, Revision of the genus Corythalia C. L. Koch, 1850, part 1: Diagnosis and new species from South America (Araneae: Salticidae: Salticinae: Euophryini), Zootaxa 4806 (1), pp. 1-144: 35-36

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Corythalia protensa

sp. nov.

Corythalia protensa   sp. nov.

Figs 3A View FIGURE 3 , 17 View FIGURE 17 A–B, 57G, 64J–K, 68G

Type material. Holotype: ♂, BRAZIL: Amazonas : Manaus, Reserva Ducke, ca. 2°55’50”S, 59°58’30”W, noninundated primary forest; H. Höfer & T. Gasnier leg. 05 Oct. 1992, interim deposition SMNK-ARA 02496, final deposition INPA GoogleMaps   . Paratype: ♂, with exactly the same data as for holotype, SMNK-ARA 02496 GoogleMaps   .

Etymology. The specific name refers to the retrolateral tibial apophysis of the male holotype resembling a hand with a long index finger stretched out (Latin “protensa” means “stretched out”, “sprawled out”); adjective.

Diagnosis. Males distinguished from those of all other Corythalia   species by the following characters in combination: embolus (E) with very broad proximal section (more than 8x broader than subdistal section), short (approximately as long as width of embolus base) and distally pointed ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K); RTA in retrolateral view very broad and distinctly digitate at ventro-distal section (digitate section with less than 1/5 the width of central section, Figs 17B View FIGURE 17 , 68G View FIGURE 68 ); tegulum (T) (retrolatero-) proximally with distinct projecting lobe (PTL), the latter with flat and blunt bulge prolaterally ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K).

Description. Male: total length 4.7, carapace length 2.1, maximal carapace width 1.6, width of eye rectangle 1.3, opisthosoma length 2.2, opisthosoma width 1.4, fovea length 0.13. EYES: AME 0.44, ALE 0.24, PME 0.07, PLE 0.20, AME–AME 0.03, AME–ALE 0.04, PME–PME 1.09, PME–PLE 0.19, ALE–PLE 0.55, PLE–PLE 0.93, clypeus height at AME 0.17, clypeus height at ALE 0.47. Cheliceral furrow with 1 promarginal and 1 retromarginal teeth. SPINATION: palp: no spines. Legs: femur I 1500, II 1600, III 2600, IV 1600; patella I–II 1000, III–IV 1010; tibia I 2005 {2004}, II 3004{3003}, III–IV 3133; metatarsus I 2014, II 2024 {2013}, III 3134, IV 4144. MEASURE- MENT OF PALP AND LEGS: palp 1.6 [0.6, 0.3, 0.1, 0.6], I 3.4 [1.1, 0.6, 0.7, 0.6, 0.4], II 3.5 [1.1, 0.7, 0.7, 0.6, 0.4], III 4.0 [1.4, 0.6, 0.8, 0.8, 0.4], IV 4.2 [1.3, 0.6, 0.8, 1.0, 0.5]. LEG FORMULA: 4321. COPULATORY OR- GAN: embolus (E) short, basal section very broad, its arising point centro-proximally at embolus base (EB); EB not exactly round, EB circle less than half as broad as tegulum (T) ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K). T slightly narrower than cymbium and proximally of EB with flat triangular lobe directed distally, sperm duct double-stacked S-shaped with quite wide loops (distal loop even slightly wider than proximal), occupying retrolateral 2/3 of T ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K). Cymbium distally in ventral ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K) and lateral view ( Figs 17B View FIGURE 17 , 68G View FIGURE 68 ) slightly truncated. Palpal tibia very short, clearly broader than long ( Figs 17 View FIGURE 17 A–B, 64J–K, 68G) and ventral tibial bump conical and not very conspicuous ( Figs 17A View FIGURE 17 , 64 View FIGURE 64 J–K). RTA broad, slightly directed ventrally and with conspicuous digitate protrusion ventro-distally ( Figs 17B View FIGURE 17 , 68G View FIGURE 68 ) and in dorso-distal section with rounded, finely serrated lobe. COLOURATION: see genus description for conservative aspects. Carapace dark brown to dark red-brown ( Fig. 57G View FIGURE 57 ). Legs dark brown to red-brown, except for some articles being lighter (see genus description) ( Fig. 57G View FIGURE 57 ). Opisthosoma like noted in genus description un- der general dorsal colouration, except for chevron-like patch in central band missing ( Fig. 57G View FIGURE 57 ).

Female: unknown.

Intraspecific variation of male copulatory organs. Flat, triangular lobe proximally of embolus base more distinctly developed in holotype ( Figs 17A View FIGURE 17 , 64J View FIGURE 64 ). Retrolatero-proximal tegulum lobe slightly broader in paratype ( Fig. 64K View FIGURE 64 ). Flat and blunt bulge prolaterally on proximal tegulum lobe in paratype ( Fig. 64K View FIGURE 64 ) larger than in holotype ( Figs 17A View FIGURE 17 , 64J View FIGURE 64 ).

Remarks. This species shows hardly similarities to any other Corythalia   species. The shape of tegulum is a little bit reminiscent of that of C. drepane   sp. nov. However, most other characters are clearly different, e.g. embolus, RTA or spermduct-course.

Distribution. Known only from the type locality in Central Amazonia, Brazil.


Tavera, Department of Geology and Geophysics


Instituto Nacional de Pesquisas da Amazonia