Coenypha trapezium Machado & Grismado, 2023

Machado, Miguel, Previato, Thales, Grismado, Cristian J. & Teixeira, Renato, 2023, Taxonomic review of the Andean crab spiders genus Coenypha Simon, 1895 (Thomisidae: Stephanopinae), Zootaxa 5306 (3), pp. 301-330 : 317-320

Coenypha trapezium Machado & Grismado sp. nov.

Figs 8 A–F , 9 A–F , 14C

Type material: Holotype: female, Pucará , Lago Lácar, Parque Nacional Lanín, Neuquén, Argentina [ca. 40° 9’50 S, 71°38’ W]., 15 December 1965, A. Giai ( MACN-Ar 18675 ).

Paratypes: 1 male, Parque Nacional La Campana [32°57’15.69”S, 71°4’38.13”W, Quillota, Valparaíso, Chile], 29 December 2002, A. Newton & A. Solodovnikov ( FMNH 2857851 ) ; 1 male, Cuesta La Dormida [33°31’16.74”S, 70°47’42.40”W, Santiago, Chile], 18 November 1982, L. Peña ( AMNH) .

Etymology. The specific name derives from latin noun trapezium , as a reference to the shape of the opisthosoma of this species. Noun in apposition.

Diagnosis. Females of C. trapezium sp. nov. resemble those of C. edwardsi by their body size (being the two biggest species in the genus), wide and flattened opisthosoma, and by the enlarged anterior femora bearing apical projections ( Figs 2A , 8A ). However, C. trapezium sp. nov. differs from this species by the yellowish body coloration, prosoma as long as wide (instead of wider than long in C. edwardsi ), and opisthosoma bearing only two pairs of posterior-lateral projections ( Figs 8A, B ) (instead of eight in C. edwardsi , Fig. 2A ). They can also be distinguished from C. edwardsi and other species of the genus by the triple twisted copulatory ducts ( Fig. 8D ); the slits leading to the copulatory openings, unlike those of C. edwardsi , are not oblique but arranged horizontally and bearing a thin and excavated MSept ( Fig. 8C ). Males can be recognized by their long ventral macrosetae on the anterior tibiae and metatarsi (I and II), well-developed caudal region ( Fig. 9A ) and RTAvbr truncated with a terminal concavity, ( Fig. 9D ), instead of a conical apophysis observed in C. edwarsi ( Fig. 3D ).

Description. Female (Holotype, MACN-Ar 18675): Anterior eye row recurved and posterior row straight; ALE almost twice as large as the AME ( Figs 8A, B ). Prosoma uniformly orange, with few clavate setae on conical sockets; sternum orange, scutiform and as wide as long. Legs are predominantly orange with few sparse dark punctuations. Opisthosoma yellow with small black spots symmetrically arranged; anterior border straight and posterior with a median concavity and two posterior lateral projections ( Fig. 8A ). Copulatory ducts membranous, spermathecae subdivided in two chambers and with no visible pore region ( Fig. 8D ). Measurements: eye diameters eyes inter distances: AME 0.08, ALE 0.14, PME 0.14, PLE 0.14, AME-AME 0.14, AME-ALE 0.10, PME-PME 0.22, PME-PLE 0.14. MOQ length 0.44, MOQ posterior width 0.32, MOQ anterior width 0.24; leg formula: 1243: leg I—femur 4.20/ patella 1.78/ tibia 2.75/ metatarsus 1.68/ tarsus 1.00/ total 11.41; II—3.40/ 1.45/ 2.20/ 1.22/ 0.80/ 4.75; III—1.42/ 0.90/ 1.02/ 0.56/ 0.54/ 4.44; IV—1.74/ 0.92/ 1.22/ 0.62/ 0.54/ 5.04; total length 7.54, prosoma length 3.09, width 3.10, opisthosoma length 4.45, clypeus height 0.38, sternum length 1.36, width 1.33, endites length 0.72, width 0.34, labium length 0.46, width 0.52.

Male (Paratype, FMNH-ISN 2857851): Anterior eye row recurved and posterior straight ( Figs 9A, B ). Prosoma brown with darker stains randomly distributed, sternum brown, scutiform and slightly wider than long. Legs with the same coloration pattern as the prosoma, except for the femora IV, which are yellow on their proximal half ( Fig. 9A ). Opisthosoma yellow with many dark clavate setae, differing from those of the female by having an additional round lobe right after the posterior abdominal projections ( Fig. 9A ). Palp bears a discoid tegulum ( Fig. 9C ), a sinuous, grooved and pointed RTA and a truncated RTAvbr with bulged tip ( Fig. 9D ). Measurements: eye diameters and interdistances: AME 0.08, ALE 0.18, PME 0.12, PLE 0.06, AME-AME 0.10, AME-ALE 0.06, PME-PME 0.18, PME-PLE 0.12. MOQ length 0.40, MOQ posterior width 0.24, MOQ anterior width 0.20; leg formula: 1234: leg I—femur 3.04/ patella 1.20/ tibia 2.44/ metatarsus 1.46/ tarsus 0.84/ total 8.98; II—2.00/ 0.81/ 1.44/ 1.00/ 0.44/ 5.69; III—0.88/ 0.56/ 0.62/ 0.42/ 0.40/ 2.88; IV—1.16/ 0.60/ 0.81/ 0.50/ 0.44/ 3,51; total length 4.58, prosoma length 2.15, width 2.00, opisthosoma length 2.43, clypeus height 0.22, sternum length 0.90, width 0.98, endites length 0.50, width 0.28, labium length 0.26, width 0.40.

Distribution. ARGENTINA: Neuquén; CHILE: Valparaíso and Santiago ( Fig. 14C ).

Figures

FIGURE 2. Coenypha edwardsi (Nicolet, 1849), female (MHNS 840). A–B habitus (A dorsal, B frontal); C, E epigyne ventral; D, F vulva dorsal.

FIGURE 3. Coenypha edwardsi (Nicolet, 1849), male (CAS 9046659). A–B habitus (A dorsal, B frontal); C–F left palp (C, E ventral, D, F retrolateral).

FIGURE 8. Coenypha trapezium sp. nov., female (MACN-Ar 18675).). A–B habitus (A dorsal, B frontal); C, E epigyne ventral; D, F vulva dorsal.

FIGURE 9. Coenypha trapezium sp. nov., male (FMNH 2857851). A–B habitus (A dorsal, B frontal); C–F left palp (C, E ventral, D, F retrolateral).

FIGURE 14. Distribution records of Coenypha species. A C. antennata (triangles), C. edwardsi (circles); B C. ditissima (squares), C. nodosa (diamonds); C black triangles are C. trapezium sp. nov. (black triangles), C. foliacea sp. nov. (white triangles).