Notionotus mexicanus Perkins, 1979

Gonzalez-Rodriguez, Liza M. & Short, Andrew Edward Z., 2022, Revision of the water scavenger beetle genus Notionotus Spangler, 1972 in the Neotropical Region (Coleoptera, Hydrophilidae, Enochrinae), ZooKeys 1109, pp. 141-191 : 141

publication ID	https://dx.doi.org/10.3897/zookeys.1109.80775
publication LSID	lsid:zoobank.org:pub:A418DA2C-02DD-4023-A9F8-41FA0AEAAC83
persistent identifier	https://treatment.plazi.org/id/ED05D427-A3D4-5C48-9515-53F49EDB5A8B
treatment provided by	ZooKeys by Pensoft
scientific name	Notionotus mexicanus Perkins, 1979
status

Treatment

Figs 2D-F View Figure 2 , 7B View Figure 7 , 14 View Figure 14

Notionotus mexicanus Perkins, 1979: 306.

Type material examined.

Holotype (male): "MEXICO, Oaxaca, 8 mi. E./Tapanatepec, tropical/stream with lg. boulders/3-VII-1974/ME&PD Perkins", "Type No/76326/U S N M", "HOLOTYPE/ Notionotus / Notionotus mexicanus /P.D.Perkins" (USNM).

Differential diagnosis.

Notionotus mexicanus is very similar morphologically to N. tricarinatus sharing characters such as body length, yellow dorsal coloration, pronotum and elytra with fine ground punctation, and elevation of the mesoventrite with a transversal and a longitudinal ridge. It can be distinguished by the shape of the aedeagus, specifically the shape of the parameres: inner margins straight and sinuate reaching the apex, parameres narrowing along apical third, and narrower than N. tricarinatus .

Description.

Size and form: Body length 1.8 mm. Body form elongate oval, convex in lateral view (Fig. 2D View Figure 2 ). Color and punctation: Dorsally yellow, head mostly yellow, frons pale brown; pronotum with two small black round spots along posterior margin (Fig. 2D View Figure 2 ). Ventrally brown; maxillary palps, mouthparts, antennae, pro and meso legs yellow, meta legs pale brown (Fig. 2E View Figure 2 ). Clypeus and labrum with dense, fine, and weakly impressed ground punctation (punctures separated by 2 × their width); pronotum and elytra ground punctation fine, weakly impressed and sparser than on head (punctures separated by 3 × their width). Head: Clypeus and labrum shallowly emarginate anteromedially, lateral margins of the labrum bearing setae. Thorax: Prosternum carinate medially, strongly raised, pointing anteriorly and acute. Elevation of mesoventrite with one transversal ridge, elevated medially, lateral sides concave; longitudinal ridge sharp, the point where the two ridges merged rounded and obtuse (e.g., Fig. 10A, B View Figure 10 ); elevation concave in lateral view; mesoventrite with triangular shape in ventral view. Metaventrite convex in the median region, pubescent with narrow glabrous patch on the medial and posterolateral area; anterior margin extending to mesoventrite elevation. Metafemora densely covered with hydrofuge pubescence on basal three-quarters (Fig. 2E View Figure 2 ). Abdomen: Abdominal ventrites very densely pubescent. Aedeagus (Fig. 7B View Figure 7 ) with basal piece 1.1 × the length of a paramere. Base of the parameres broader than the base of the median lobe; outer margin slightly convex along basal two-thirds, then slightly sinuate apically, inner margins nearly straight along basal two-thirds and then sinuate apically; apex of parameres rounded. Median lobe shorter than the parameres, approximately triangular, with acute apex.