Nanosaphes castaneus, Giron, Jennifer C. & Short, Andrew Edward Z., 2018

Giron, Jennifer C. & Short, Andrew Edward Z., 2018, Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 768, pp. 113-158 : 138-141

Nanosaphes castaneus sp. n. Figs 15 A–D; 18D; 19

Type material examined.

Holotype (male): "BRAZIL: Pará: Rio Xingu/ Camp (52°22'W, 3°39'S)/ Altamira (ca 60km S.)/ 12 Oct 1986/ P. Spangler & O. Flint// Colln. #21, pond at 2nd/ palm grove on trail 1" ( USNM). Paratypes (3): BRAZIL: Pará: Rio Xingu, Camp (52°22'W, 3°39'S)/ Altamira (ca 60km S.)/ 12 Oct 1986/ P. Spangler & O. Flint (1, USNM); same data as holotype (2, USNM, SEMC).

Differential diagnosis.

Nanosaphes castaneus can be easily recognized by its smooth elytra (as opposed to rather coarsely punctate as in N. punctatus , compare Fig. 15A, B to Fig. 15E, F), and the uniform brown coloration along the body (as opposed to having yellow pronotum and brown elytra (as in N. hesperus and N. tricolor , compare Fig. 15 A–D to Fig. 16).

Description.

Body length 1.3-1.4 mm, width 0.8-0.9 mm. Body elongate oval, weakly convex, uniformly brown throughout (Fig. 15A, B). Dorsal surface shallowly punctate. Posterior elevation of mesoventrite weakly carinate. Pubescence of ventral surface scanty. Aedeagus (Fig. 18C) with basal piece 0.4-times the length of parameres; parameres longer than median lobe, with rounded apex; gonopore situated near apical third of median lobe.

Etymology.

Named in reference to the uniform brown coloration along the body, with the Latin word castaneus meaning brown, of the color of chestnuts.

Distribution.

Brazil ( Pará). Only known from one locality. See Fig. 19.

Biology.

In referencing Spangler’s original field notes, these specimens were collected in forested pond.