Chrosiothes decorus, Rodrigues, 2017

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

Chrosiothes decorus new species

Figs. 13, 14 , 26 , 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 209896 ) . Paratype. Brazil: same data as holotype, 1F, collected by beating tray ( IBSP 209897 ) .

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. 13 ) and by the spermathecae more separated from each other ( Fig. 14 ). 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. 26 ). 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. 26 ). Dorsally without tubercles ( Fig. 26 ). Spinnerets yellow. Epigynum with a slightly sclerotized plate, wider than long ( Fig. 13 ) with a ventral subcircular depression ( Fig. 13 ). Internal genital with oval spermathecae ( Fig. 14 ); fertilization ducts shorts, uncoiled and copulatory ducts long and coiled, over the spermathecae ( Fig. 14 ).

Male. Unknown.

Distribution. Known only from the type locality.

Figures

FIGURES 13 – 15. Chrosiothes decorus new species: Female: 13, Epigynum, ventral, 14, Internal genitalia, dorsal, clarified. Chrosiothes una new species: Female: 15, Epigynum, ventral. Scale bars, 0.25 mm.

FIGURES 24 – 28. Body, dorsal view. Chrosiothes murici new species: 24, Male, 25, Female. Chrosiothes decorus new species: 26, Female. Chrosiothes una new species: 27, Female. Chrosiothes venturosus Marques & Buckup, 1997: 28, Female. Scale bars, 1 mm.