Novochares xingu, Short & Girón, 2023

Short, Andrew Edward Z. & Giron, Jennifer C., 2023, Revision of the Neotropical water scavenger beetle genus Novochares Giron & Short (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 1171, pp. 1-112 : 1

Novochares xingu sp. nov.

Figs 27D, E , 29B

Type material.

Holotype (male): "BRAZIL: Pará: Rio Xingu/ Camp (3°39'S, 52°22'W)/ Altamira (ca. 60 km S.)/ 10 Oct 1986/ P. Spangler & O. Flint", "Colln. #19, 1st jungle/ stream on trail 4" (USNM). Paratypes (3 exs.): Brazil: Pará: Same data as type except 12.x.1986, pond at 2nd palm grove on trail 1, Colln. #21 (1, SEMC); same data as type except 15.x.1986, pond at 2nd palm grove on trail 1, Colln. #24 (2, USNM).

Differential diagnosis.

See differential diagnosis for N. trifurcatus .

Description.

Body length 7.6-8.0 mm. Coloration: Dorsal surfaces dark brown and sheeny, with slightly paler margins of pronotum and elytra. Head: Maxillary palps nearly 1.4 × longer than width of head, uniformly orange to brown in color. Thorax: Ground punctation on pronotum and elytra dense and very shallowly impressed. Elytra without rows of serial punctures, each with very faint rows (one dorsal and two or three lateral) of scarce and weakly marked systematic punctures. Prosternum flat. Posterior elevation of mesoventrite with posterior face somewhat bisinuate and medial longitudinal ridge extending anteriorly (resembling a nose). Abdomen: Apical emargination of fifth ventrite relatively deep, U-shaped. Aedeagus: (Fig. 27D, E ) Overall shape pear-like, 2.9 × longer than wide; lateral projection on apical region of outer margin of each paramere pointed; at closest point, dorsal inner margins of parameres separated by distance 0.5 × greatest width of a paramere; dorsal plate of median lobe with neck 0.6 × as broad as base; arms of dorsal plate of median lobe gradually and weakly narrowing towards apex, parallel, with apex narrowly and dorsally pointed, nearly 0.25 × length of dorsal plate of median lobe; notch between arms at base slightly narrower than base of an arm; ventral plate of median lobe weakly sclerotized, triangular, apically acute, apex extending to mid-length of dorsal plate; basal piece 0.33 × length of a paramere. In lateral view, aedeagus flattened, somewhat triangular, with ventral outline of parameres 5.8 × longer than greatest width near base; dorsal outline nearly straight.

Etymology.

Xingu, in reference to the Xingu peoples of the region where this species is found.

Distribution.

Known only from several collections at the type locality in Brazil ( Pará) (Fig. 29B ).

Habitat.

The label data indicate specimens were taken from a "jungle stream" and a “pond”.

Figures

Figure 27. Aedeagi of the Novochares tectiformis species group A-C N. mura D, E N. xingu F-H N. danta I, J N. trifurcatus A, D, F, I dorsal view B, E, G ventral view C oblique view H, J lateral view.

Figure 29. Distribution of Novochares tectiformis species group A N. duo (red), N. bolivianus (yellow), N. atlanticus (blue), N. danta (green) B N. coya (red), N. yora (yellow), N. xingu (blue), N. mura (green), N. trifurcatus (purple) C N. tectiformis (red) D N. pume (red), N. piaroa (yellow), N. florifer (blue), N. mojenos (green), N. tambopatense (purple).