Kryptochroma gigas Machado & Viecelli & Guzati & Grismado & Teixeira 2021, gen. et sp. nov.

Kryptochroma gigas Machado & Viecelli gen. et sp. nov.

urn:lsid:zoobank.org:act: 6DC79758-A014-4D6F-960B-4C63ACB17982

Figs 3, 9, 21A

The female of Kryptochroma gigas gen. et sp. nov. resembles those of K. quadrata sp. nov. and K. pentacantha by its large body size, which is significantly larger than in the other species here described. Kryptochroma gigas gen. et sp. nov. can be distinguished by the elevated and short opisthosoma and by the heart-shaped epigynal plate with a short and stout projection over a wide median septum, which divides the median field in two longitudinal gutters reaching the copulatory openings (Figs 3C–F, 21A).

The epithet is a Latin feminine noun that means giant, referring to the bigger size of this species compared to other species of the genus.

Holotype BRAZIL • ♀; Minas Gerais, Simonésia, Estação Biológica da Mata do Sossego; 20°04′25″ S, 42°04′13″ W; 28–30 Nov. 2010; M.T.T. Santos leg.; UFMG 4734.

Additional material

None.

Female (holotype, UFMG 4734)

PROSOMA. Anterior eye row very recurved and posterior slightly procurved; prosoma dark yellow with large lateral black taints, median region and posterior slope yellow, contoured by black lines (Fig. 3A– B). Chelicerae dark yellow with black stains, endites and labium black, sternum black with a median yellow taint.

LEGS. Femora I and II dorsally enlarged and with many setiferous tubercles, femora III and IV bicolor, half black, half yellow.

OPISTHOSOMA. Predominantly dark-yellow, black on the back of the abdominal projections and on the sides, rough surfaced and slightly concave on the anterior border (Fig. 3A–B).

MEASUREMENTS. Eye diameters and eye interdistances:AME 0.09,ALE 0.14, PME 0.12, PLE 0.12, AME– AME 0.08, AME–ALE 0.12, PME–PME 0.24, PME–PLE 0.06, MOQ length 0.43, MOQ width 0.48; leg formula: 1-2-4-3: leg I – femur 4.66/ patella 2.59/ tibiae 3.10/ metatarsus 2.17/ tarsus 1.29/ total 13.81; II – 3.83/ 2.07/ 2.84/ 1.86/ 1.29/ 11.89; III – 2.07/ 1.29/ 1.86/ 1.19/ 0.82/ 7.23; IV – 2.59/ 1.19/ 1.86/ 1.29/ 0.82/ 7.75. Total body length 9.62; prosoma 4.40 length, 4.04 width; opisthosoma

length 4.62; clypeus 0.37 height; sternum 1.45 length, 1.20 width; endites 0.69 length, 0.40 width; labium 0.48 length, 0.53 width.

Male

Unknown.

Central Brazil (Minas Gerais) (Fig. 9).