Revision of the water scavenger beetle genus Notionotus Spangler, 1972 in the Neotropical Region (Coleoptera, Hydrophilidae, Enochrinae) Author Gonzalez-Rodriguez, Liza M. Department of Ecology & Evolutionary Biology, and Division of Entomology, Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA lizmgr287@gmail.com Author Short, Andrew Edward Z. Department of Ecology & Evolutionary Biology, and Division of Entomology, Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA text ZooKeys 2022 2022-07-01 1109 141 191 http://dx.doi.org/10.3897/zookeys.1109.80775 journal article http://dx.doi.org/10.3897/zookeys.1109.80775 1313-2970-1109-141 A418DA2C02DD4023A9F841FA0AEAAC83 2CB5DB1837165454A3C0E833ACD79CA7 Notionotus parvus sp. nov. Figs 4F , 9E , 15 Notionotus sp. 2 in Short, 2013: 88. Type material. Holotype (male) : "SURINAME: Sipaliwini District/ N 2.97731°, W 55.38500°, 200 m/ Camp 4 (low), Kasikasima; sandy/ stream on trail to METS camp/ 20.iii.2012; SR12-0320-02A/ leg. A. Short; 2012 CI-RAP Survey" (NZCS). Paratypes (2 exs.): Suriname : same data as holotype (2 exs., SEMC, including DNA voucher SLE2388). Differential diagnosis. Notionotus parvus can be recognized by the pale reddish yellow color in the head and pronotum and reddish brown in the elytra (Fig. 4F ). Furthermore, the aedeagus is quite unique, parameres tubular in shape with lanceolate appendages in the outer margin which are shorter than the length of the parameres, and gonopore with crown-shape located in the apical region of the median lobe (Fig. 9E ). Description. Size and form : Body length 1.7-1.9 mm. Body form elongate oval, convex in lateral view (Fig. 4F ). Color and punctation : Dorsally reddish brown, head and pronotum pale reddish yellow; pronotum with two small black round spots along posterior margin; elytra dark reddish brown (Fig. 4F ). Ventrally reddish brown; maxillary palps and mouthparts light yellow reddish, and antennae yellow (antennal club slightly darker). Pro and meso legs yellow, meta legs pale reddish brown. Clypeus and labrum with dense, fine, and weakly impressed ground punctation (punctures separated by 2 x their width); pronotum and elytra ground punctation fine, weakly impressed and sparser than on head (punctures separated by 3 x their width). Head : Clypeus and labrum shallowly emarginate anteromedially, lateral margins of the labrum bearing setae. Thorax : Prosternum carinate medially, strongly raised, acute and pointing anteriorly. Elevation of mesoventrite with two transversal ridges, elevated medially, lateral sides concave; longitudinal ridge broad anteriorly and sharp posteriorly, the point where the three ridges merged wide and blunt (e.g., Fig. 10C, D ); elevation slightly convex in ventral 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 with dense hydrofuge pubescence along basal three-quarters of the anterior margin and sparse pubescence along the apical posterior margin. Abdomen : Abdominal ventrites very densely pubescent. Aedeagus (Fig. 9E ) with basal piece 0.5 x the length of a paramere. Base of the parameres narrower than the base of the median lobe; parameres tubular shape, outer margins sinuate and covered by lanceolate appendages that cover three-quarters of the margin; inner margins sinuate, apex of the parameres rounded. Median lobe shorter than the parameres, wide at basal region, narrowing apically, apex rounded and wide; gonopore crown-shaped and situated at apex of median lobe. Figure 14. Distribution map of Notionotus spp. Etymology. The species name is derived from the Latin word parvus meaning little or small in reference to the small aedeagus size of this species. Distribution. Only known from the type locality in southern Suriname (Fig. 15 ). Figure 15. Distribution map of Notionotus spp. Life history. This species was collected along the margins of a small, sandy-bottomed stream.