Charinus magalhaesi sp. nov.

urn:lsid:zoobank.org:act: 748735F1-D676-4C38-AC45-4F6E99F51B6C

Figs 27, 30; Table 2

Diagnosis

This species may be separated from other Charinus in Amazonia and northern South America by means of the following combination of characters: tegument covered with clavate setae; median eyes and median ocular tubercle absent (Fig. 30C); female gonopods cushion-like; leg IV basitibia with three pseudo-articles; cheliceral claw with four or five teeth.

Charinus magalhaesi sp. nov. resembles C. vulgaris, but the setae on the carapace and pedipalp patella are clavate, as in C. carvalhoi sp. nov., C. longitarsus, C. montanus and C. quinteroi . Charinus magalhaesi sp. nov. may be distinguished from these species by the combination of cushion-like gonopods, the absence of median eyes and median ocular tubercle, and the length of the first tarsal article of leg I which is equal to the sum of the subsequent two articles.

Etymology

Patronym honoring Dr Celio Magalhaes, for his contribution to the study of freshwater crustaceans and his efforts towards conservation of the Amazon.

Type material

Holotype BRAZIL • ♀; Amazonas, Manaus, Reserva Florestal Adolpho Ducke; 02°58′31.59″ S, 59°58′42.33″ W; 18 Mar. 2015; A.P.L.Giupponi and G.S. Miranda leg.; under wooden house; INPA ex MNRJ 9285.

Paratypes BRAZIL • 3 juv. ♀♀; same collection data as for holotype; INPA ex MNRJ 9285 • 1 juv.; same collection data as for holotype; MNRJ 9279 • 1 ♀; same collection data as for holotype; MNRJ 9282, AMCC [LP 13406] • 1 ♀; same collection data as for holotype; MNRJ 9278, AMCC [LP 13393] .

Description

CARAPACE. Six anterior setae (Fig. 30A); clavate setae scattered across carapace; frontal process triangular (Fig. 30C). Small granules densely scattered between ocular triads and among sulci. Median eyes and median ocular tubercle absent (Fig. 30C); lateral eyes well developed (Fig. 30A), seta posterior to each lateral ocular triad; lateral ocular triad well separated from carapace margin (Fig. 30A).

STERNUM. Tritosternum projected anteriorly with typical setation, long, surpassing base of pedipalp coxae (Fig. 30B); other sternal platelets small and flat, each with pair of setae; pentasternum with two setae near membranous region and two setae anteriorly (Fig. 30B).

OPISTHOSOMA. Ventral sacs and ventral sac cover absent.

GENITALIA. Female genital operculum with prominent setae posteromedially and some smaller setae near margin; gonopod cushion-like, with base unsclerotized. Male unknown.

CHELICERAE. Small, flat tooth on retrolateral surface of basal segment, opposite to bifid tooth; retrolateral surface of claw with continous row of setae, basally to medially; claw with four teeth; row of five setae on prolateral surface of basal segment; bifid tooth on basal segment with dorsal cusp larger than ventral cusp.

PEDIPALPS. Coxal dorsal carina with three prominent setae encircled by round carina and three setae on margin. Femur with three dorsal and three ventral spines (Fig. 30E); two prominent setiferous tubercles between first dorsal spine and proximal margin; setiferous tubercle between ventral spine 1 and proximal margin. Patella with three dorsal spines in primary series; prominent setiferous tubercle distal to spine I, one fifth length of spine I (Fig. 30E); two ventral spines (Fig. 30F); prominent setiferous tubercle between spine I and distal margin. Tibia with ventral spine distally and seta between spine and distal margin. Tarsus with two dorsal spines (Fig. 30D), proximal spine one-third length of distal spine; cleaning organ with 30–39 setae in ventral row.

LEGS. Tibia of leg I with 21 articles, tarsus I with 36–38 articles; length of first tarsal article equal to sum of lengths of two subsequent articles. Leg IV basitibia with three pseudo-articles, without sclerotized, denticulate margin projecting from apex of articles; trichobothrium bt situated in proximal third of pseudo-article; distitibia trichobothrium bc situated closer to sbf than to bf, sc and sf series each with five trichobothria.

Measurements

See Table 2.

Distribution

Known only from the type locality.

Natural history

Found under house on sandy soil at the Reserva Florestal Adolpho Ducke; not found in the forest.