Kryptochroma: a new genus of bark-dwelling crab spiders (Araneae, Thomisidae) Author Machado, Miguel 9C99DF66-7481-4DE2-BFC2-FE73D29F8A6E Laboratório de Aracnologia, Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil. machadom.arachno@gmail.com Author Viecelli, Rafaela 78CA106B-2CFC-4B8B-8E05-168350DA95F8 Laboratório de Aracnologia, Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil. rafaviecelli1807@gmail.com Author Guzati, Catherine 9A03FF9F-07D8-4F15-9735-FAC96FE23015 Laboratório de Aracnologia, Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil. c.guzati@edu.pucrs.br Author Grismado, Cristian J. A1D00976-57EF-417E-AE28-DF3BF2BAB6B1 División Aracnología, Museo Argentino de Ciencias Naturales “ Bernardino Rivadavia ”, Buenos Aires, Argentina. grismado@macn.gov.ar Author Teixeira, Renato A. BA923A63-8230-40C0-819A-588EE3815CA9 Laboratório de Aracnologia, Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil. renato.teixeira@pucrs.br text European Journal of Taxonomy 2021 2021-11-03 778 26 70 journal article 3633 10.5852/ejt.2021.778.1565 7e1d26e0-1470-4111-8a06-50d8f3ce8ec1 2118-9773 5673850 4AFEC628-D555-44BD-8592-3A338694885F Kryptochroma renipalpis ( Mello-Leitão, 1929 ) gen. et comb. nov. Figs 15 , 18, 19D Stephanopis renipalpis Mello-Leitão, 1929: 60 , figs 143–144. Note Mello-Leitão (1929) also designated a “cotype” (MNHN 17335) of S. renipalpis from Pernambuco ; however, the specimen was not found. Diagnosis The male of K. renipalpis is similar to that of K. quinquetuberculata due to their well-developed MS, light clypeus and white macula on dorsum ( Fig. 15A–B ). However, it can be distinguished from this and other congeneric species by the medially positioned spermatic duct ( Figs 15C, E , 19D) and extreme curvature of the RTA, which is thinner than in the other species and smooth at the tip ( Figs 15D, F , 19D). Material examined Holotype BRAZIL • ♂ ; Rio de Janeiro ; MNHN 6945 . Additional material BRAZIL • 1 ♂ ; Rio de Janeiro , Angra dos Reis , Enseada das Palmas ; 23°08′30″ S , 44°08′26″ W ; 2–12 Feb. 1997 ; M. Ramírez leg.; MCTP 42730 . Description Male (MCTP 42730) PROSOMA. Anterior row eye strongly recurved and posterior slightly procurved ( Fig. 15A–B ); carapace predominantly reddish-brown with clypeus whitish ( Fig. 15B ); sternum slightly longer than wide, entirely reddish-brown; labium truncated and totally dark-brown; chelicerae reddish-brown with distal lighter spots. LEGS. Anterior legs (I and II) mostly reddish-brown, with yellowish spots on the proximal portion of metatarsi and tarsi; posterior legs (III and IV) with bicolor femora. OPISTHOSOMA. Rough surfaced, dark-yellow with red spiniform projections ( Fig. 15A ). MEASUREMENTS. Eye diameters and eye interdistances: AME 0.06, ALE 0.09, PME 0.08, PLE 0.08, AME–AME 0.08, AME–ALE 0.06, PME–PME 0.12, PME–PLE 0.04,MOQ length 0.27, MOQ width 0.37; leg formula: 1-2-4-3:leg I – femur 1.91/ patella 21.03/ tibiae 1.29/ metatarsus 1.03/ tarsus 0.67/ total 5.93; II – 1.29/ 0.67/ 0.88/ 0.70/ 0.48/ 4.02; III – 0.85/ 0.45/ 0.64/ 0.41/ 0.32/ 2.67; IV – 0.91/ 0.40/ 0.72/ 0.51/ 0.37/ 2.91. Total body length 4.24; carapace 2.07 length, 1.96 width; opisthosoma length 2.17; clypeus 0.19 height; sternum 0.74 length, 0.67 width; endites 0.38 length, 0.29 width; labium 0.22 length, 0.29 width. Fig. 15. Male of Kryptochroma renipalpis ( Mello-Leitão, 1929 ) gen. et comb. nov. (MCTP 42730). A . Habitus, dorsal view. B . Front. C–F . Left male palp. C, E . Ventral view. D, F . Retrolateral view. Female Unknown. Distribution Brazil ( Rio de Janeiro ) ( Fig. 18 ).