Chrosiothes decorus,

Rodrigues, Everton Nei Lopes, 2017, Six new species and new records of the spider genus Chrosiothes from Brazil with the description of the female of Chrosiothes venturosus Marques & Buckup, 1997 (Araneae, Theridiidae, Spintharinae), Zootaxa 4329 (3), pp. 219-236: 226-227

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Chrosiothes decorus

new species

Chrosiothes decorus  new species

Figs. 13, 14View FIGURES 13 – 15, 26View FIGURES 24 – 28, 30

Type material. Holotype. Brazil: São Paulo, Ilhabela, Parque Estadual de Ilhabela , 23°51’7”S; 45°20’38”W, 14.X.2001, Equipe Biota leg., 1F, collected by beating tray ( IBSP 209896View Materials)GoogleMaps  . Paratype. Brazil: same data as holotype, 1F, collected by beating tray ( IBSP 209897View Materials)GoogleMaps  .

Etymology. The specific name is taken from Latin decorus  (beautiful), in reference to the habitus of this species.

Diagnosis. Females are similar to those of C. minusculus (Gertsch, 1936)  (see Levi 1954, figs. 28, 29) by having the epigynum with a subcircular depression and by the shape of the internal genitalia with oval spermathecae, but differ by the subcircular depression farther from the posterior margin of epigynum ( Fig. 13View FIGURES 13 – 15) and by the spermathecae more separated from each other ( Fig. 14View FIGURES 13 – 15). Males remain unknown.

Description. Female holotype (from Parque Estadual de Ilhabela, IBSP 209896). Total length 3.30. Carapace length 0.88, width 0.73. Clypeus height 0.14. Sternum length 0.78, width 0.62. Abdomen length 2.18, width 2.18, height 1.97. Leg formula IV/I/II/III; segment length (I/II/III/IV): femora 1.91/1.40/1.02/1.95; patellae+tibiae 2.22/ 1.34/1.05/2.31; metatarsi+tarsi 2.94/1.95/1.61/3.12; total 7.07/4.70/3.69/7.39. Carapace orange-brown, semicircular, almost half the width of abdomen, cephalic region narrow, about half width of carapace ( Fig. 26View FIGURES 24 – 28). Chelicerae same color of carapace. Sternum lighter than carapace with darkened edges. AME, ALE and PLE with same diameter while PME are bigger. Legs with same color as the carapace. Abdomen oval, dorsum and venter yellow with irregular brown marks ( Fig. 26View FIGURES 24 – 28). Dorsally without tubercles ( Fig. 26View FIGURES 24 – 28). Spinnerets yellow. Epigynum with a slightly sclerotized plate, wider than long ( Fig. 13View FIGURES 13 – 15) with a ventral subcircular depression ( Fig. 13View FIGURES 13 – 15). Internal genital with oval spermathecae ( Fig. 14View FIGURES 13 – 15); fertilization ducts shorts, uncoiled and copulatory ducts long and coiled, over the spermathecae ( Fig. 14View FIGURES 13 – 15).

Male. Unknown.

Distribution. Known only from the type locality.


Instituto Biologico de Sao Paulo