Chrosiothes, Simon, 1894

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, Spinthari, Zootaxa 4329 (3), pp. 219-236: 227-228

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Chrosiothes  una new species

Fig. 15View FIGURES 13 – 15, 27View FIGURES 24 – 28, 30

Type material. Holotype. Brazil: Bahia, Una, Reserva Biológica de Una , 15°10’S; 39°03’W, 13.IV.1998, A.D. Brescovit et al. leg., 1F ( IBSP 18247View Materials).GoogleMaps 

Etymology. The specific name is a noun in apposition taken from the type locality.

Diagnosis. Females are similar to those of C. jenningsi Piel, 1995  (see Piel 1995, fig. 10), by the presence of oval depression ( Fig. 15View FIGURES 13 – 15), but differ from this and the all other species of the genus by the presence of the reduced medium atrium ( Fig. 15View FIGURES 13 – 15). Males remain unknown.

Description. Female holotype (from Reserva Biológica de Una, IBSP 18247). Total length 2.73. Carapace length 1.04, width 0.93. Clypeus height 0.14. Sternum length 0.60, width 0.52. Abdomen length 2.18, width 2.10. Leg formula IV/I/II/III; segment length (I/II/III/IV): femora 1.38/1.00/0.77/1.40; patellae+tibiae 1.53/0.98/0.75/ 1.44; metatarsi+tarsi 2.01/1.40/1.09/2.24; total 4.93/3.40/2.62/5.10. Carapace semicircular, dark-brown, with a narrow black border, eye region black and a black band as wide as eye region covering length of carapace ( Fig. 27View FIGURES 24 – 28). Chelicerae dark brown. Sternum brown, with darkened edges. ALE and PLE smaller than the other eyes; PME bigger than the other eyes. Legs brown. Abdomen subcircular, olive-brown with yellow transverse bands posteriorly ( Fig. 27View FIGURES 24 – 28). Spinnerets orange-brown. Epigynum with a slightly sclerotized plate, wider than long ( Fig. 15View FIGURES 13 – 15); ventrally with depression ( Fig. 15View FIGURES 13 – 15) with presence of the reduced medium atrium ( Fig. 15View FIGURES 13 – 15).

Male. Unknown.

Distribution. Known only from the type locality.


Instituto Biologico de Sao Paulo