Amazochroma, Rafael N. Carvalho & Adriano B. Kury, 2018

Rafael N. Carvalho & Adriano B. Kury, 2018, Further dismemberment of Discocyrtus with description of a new Amazonian genus and a new subfamily of Gonyleptidae (Opiliones, Laniatores), European Journal of Taxonomy 393, pp. 1-32 : 12-17

Amazochroma gen. nov.

urn:lsid:zoobank.org:act:8DB19042-42A0-46BE-8A3F-3EB224861351

Type species

Discocyrtus carvalhoi Mello-Leitão, 1941 .

Etymology

From region name Amazonia + the Greek χρῶμα (color), referring to the vivid bands shown by the species, contrasting with the dull color of most Amazonian gonyleptids. Gender neuter.

Diagnosis

Amazochroma gen. nov. has the outline of the male dorsal scutum gamma-shaped (in common with Discocyrtanus and D. testudineus , different from the gamma triangular shape in Roeweria ). Ocularium low (in common with Discocyrtanus and Roeweria , contrasting with an elevated present in D.testudineus ), with a pair of strong paramedian divergent spines (as in D. testudineus , Discocyrtanus and Roeweria ). Legs with trichromatic striped pattern (most markedly III–IV) in strong yellow, red and black (not occurring in Mitobatinae , D. testudineus , Discocyrtanus and Roeweria ). Area II with two anterior and six posterior paramedian tubercles (not occurring in Mitobatinae , D. testudineus , Discocyrtanus and Roeweria ). Anterior outline of scutal area III only gently arched, not convex penetrating into area II (as in Discocyrtanus and Roeweria , contrasting with an outline strongly arched deeply encased in area II found in D. testudineus ). Posterior outline of scutal area III only gently arched, not twice convex penetrating into area IV (in common with Discocyrtanus and D. testudineus , different from twice – on left and right sides – strongly convex penetrating into area IV found in Roeweria ). Tr IV with a prolateral medial apophysis (not occurring in Mitobatinae , D. testudineus , Discocyrtanus and Roeweria ). Pa IV without a retroventral row of tubercles (present in Mitobatinae , D. testudineus , Discocyrtanus and Roeweria ). Stylus strongly sigmoid (in common with Discocyrtanus , different from C-shaped in Roeweria and the substraight shape in D. testudineus ). Stylus with well-marked apical barbed winglets (same as in Discocyrtanus and Roeweria , absent in D. testudineus ). Presence of well-developed dry marks encircling the granules and tubercles of dorsal scutum, free tergites and Cx–Tr I–IV (in contrast to presence restricted to tip of tubercles of dorsal scutum in Discocyrtanus and absence in D. testudineus and Roeweria ). Legs with trichromatic striped pattern (most markedly III–IV) in strong yellow, red and black (not occurring in D. testudineus , Discocyrtanus and Roeweria ). Cx IV of males with prodorsal distal apophysis very strong and substraight, only gently curved to ventral side (extremely curved in Roeweria , slender geniculate in Discocyrtanus and D. testudineus ). Macroseta C 3 set widely apart from the other C, forming a diastema (as in Roeweria , contrasting with all macrosetae C placed distally, with subequal intervals between them found in Discocyrtanus and macrosetae C placed distally, united as in D. testudineus ).

Included species.

Amazochroma carvalhoi (Mello-Leitão, 1941) gen. et comb. nov. and Amazochroma pedroi gen. et sp. nov.

Combined distribution.

Brazil, states of Acre, Amazonas, Mato Grosso, Pará and Rondônia. Suriname, district of Sipaliwini. France, department of French Guiana, administrative subdivision of Maripasoula ( Figs 2 , 11 ).

Figures

Fig. 2. Northern Brazil and Guyanas, showing distribution of the species of Amazochroma gen. nov. Shaded areas in the background are WWF biomes, green are moist broadleaf forests and orange are grasslands, savannas and shrublands.

Fig. 11. Brazil and Guianas, showing parapatric distribution of the genera of Roeweriinae subfam. nov. Shaded areas inthebackground areMorrone's regionalization ofthe Neotropics(“provinces”;Morrone, 2014).ATL =Atlanticprovince; CER =Cerrado province; GUI = Guianan Lowlands province; MAD = Madeira province; PAR = Paraná Forest province; ROR = Roraima province.