Notionotus giraldoi, González-Rodríguez & Short, 2022

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

Notionotus giraldoi sp. nov.

Figs 4I , 7D , 13A , 14

Type material.

Holotype (male): "BRAZIL: Rondonia: Novo [sic: Nova] Uniao/ -10.91764°, -62.377°, 359 m/ Vale do Cachoeiras; 10.vii.2018/ leg. Short; Margin of rocky/ stream; BR18-0710-02B" (INPA). Paratypes (56 exs.): Brazil: Mato Grosso do Sul State: Rio Bento Gomes (Pantanal), Campo Allegre I, 15°45'S, 56°33'W, 1993-1994, leg. E. Stuhr, spring-fed brook, (9 exs., NMW, SEMC). Rondonia State: Same data as holotype (13 exs., SEMC, including DNA Voucher SLE2334); same data except margin of rocky stream with waterfall (12 exs., SEMC); same data except small sandy-bottom stream margin BR18-0710-02A (20 exs., INPA, SEMC, including DNA voucher SLE2088); same data except flotation of marginal root mats, BR18-0711-01C (1 ex., SEMC); Ji-Parana (27 km SW), Rio Urupa, rock pools along margins of river, -11.03618, -62.14465, 135 m, leg. Short, 10.vii.2018, rock pools along margins of river, BR18-0710-01A (1 ex., SEMC, DNA voucher SLE2332).

Differential diagnosis.

The dorsal coloration, shape of the elevation of the mesoventrite, area of pubescence on the metafemur and degree of impression of the ground punctation of Notionotus giraldoi are very similar to N. dilucidus , N. mexicanus , N. tricarinatus . It can be distinguished only by its aedeagus, including the unique shape of the parameres with a depression of the inner margin, as well as by the abrupt narrowing in the midlength of the median lobe (Fig. 7D ).

Description.

Size and form: Body length 1.7-1.9 mm. Body form elongate oval, convex in lateral view (Fig. 4I ). Color and punctation: Dorsally yellow, head yellow; pronotum paler than elytra, with two small black round spots along posterior margin (Fig. 4I ). Ventrally brown; maxillary palps, mouthparts, antennae (antennal club slightly darker) and legs yellow. Clypeus and labrum with dense, fine, and weakly impressed ground punctation (punctures separated by 2 × their width); pronotum and elytra with 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 ); elevation flat 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, medial region patch drop-shaped; anterior margin extending to mesoventrite elevation. Metafemora densely covered with hydrofuge pubescence on basal three-quarters. Abdomen: Abdominal ventrites very densely pubescent. Aedeagus (Fig. 7D ) with basal piece nearly the same length of a paramere. Base of the parameres slightly narrower than the base of the median lobe; outer margins sinuate, inner margins depressed in the midlength, depression extending to apex without reaching it; apex of parameres wide and blunt. Median lobe length almost equal to the parameres, wide at basal region, narrowing abruptly in the midlength, apical third slender, narrow, and rounded.

Etymology.

L. M. González-Rodríguez names this species in honor of Juan José Giraldo Gutiérrez in gratitude for the encouragement and support in her career.

Distribution.

Known from several localities in the Brazilian States of Rondonia and Mato Grosso do Sul (Fig. 14 ).

Life history.

This species was collected along the margins of two adjacent streams, one with a sandy bottom and one with a rocky bottom (Fig. 13A ). Specimens were collected by agitating the sand and detritus along the stream margin as well as washing root mats in tubs of water.

Figures

Figure 4. Habitus of Notionotus spp.: A N. bicolor (paratype) B N. patamona (holotype) C N. brunbadius (holotype) D N. insignitus (paratype) E N. juma (paratype) F N. parvus (holotype) G N. garciae (paratype) H N. vatius (holotype) I N. giraldoi (paratype) J N. bifidus (paratype) K N. peruensis (holotype).

Figure 7. Aedeagi of Notionotus liparus species group A N. liparus (non-type specimen) B N. mexicanus (holotype) C N. vatius (holotype) D N. giraldoi (holotype).

Figure 10. Mesoventral process of Notionotus spp. A N. dilucidus B N. tricarinatus C N. insignitus D N. bicolor. Red marks pointing to transverse ridge in A-D blue marks pointing to second transverse ridge in C, D.

Figure 13. Habitat of Notionotus spp. A type locality and habitat of N. giraldoi (collecting event BR 18 - 0710 - 02 A) B type locality and habitat of N. vatius (collecting event BR 18 - 0627 - 01 A) C type locality and habitat of N. brunbadius (collecting event BR 18 - 0609 - 03 A) D type locality and habitat of N. garciae (collecting event BR 18 - 0609 - 01 A) E type locality and habitat of N. juma (collecting event BR 18 - 0609 - 02 B) F type locality and habitat of N. retusus (collecting event GY 14 - 0311 - 02 A).

Figure 14. Distribution map of Notionotus spp.