Chasmogenus berbicensis, Smith & Short, 2020

Smith, Rachel R. & Short, Andrew Edward Z., 2020, Review of the genus Chasmogenus Sharp, 1882 of northeastern South America with an emphasis on Venezuela, Suriname, and Guyana (Coleoptera, Hydrophilidae, Acidocerinae), ZooKeys 934, pp. 25-79 : 25

publication ID

https://dx.doi.org/10.3897/zookeys.934.49359

publication LSID

lsid:zoobank.org:pub:B9F2C8D8-C031-4191-B6F5-1E78D4D6881E

persistent identifier

https://treatment.plazi.org/id/58124959-D58E-4CF6-9815-D6ED103DDF7B

taxon LSID

lsid:zoobank.org:act:58124959-D58E-4CF6-9815-D6ED103DDF7B

treatment provided by

ZooKeys by Pensoft

scientific name

Chasmogenus berbicensis
status

sp. nov.

Chasmogenus berbicensis sp. nov. Figures 9C View Figure 9 , 14D View Figure 14 , 17 View Figure 17 , 22A View Figure 22

Chasmogenus sp. B Short, Salisbury, & La Cruz 2018: 193.

Type material.

Holotype (male): "Guyana: Region 6/ 4°08.809'N, 58°14.232'W, 108/ Upper Berbice, Basecamp 1/ margin of berbice river/ leg. Short, Salisbury, La Cruz/ 22.ix.2014; GY14-0922-02A"/ "[barcode] SEMC1357824/ KUNHM-ENT", "HOLOTYPE/ CHASMOGENUS/ berbicensis sp. n./ des. Smith & Short" (CBDG). Paratypes (6): Guyana: Region 6: same data as holotype (3 exs., SEMC including DNA Voucher SLE1864); Upper Berbice Basecamp 1m 4°09.289'N, 58°10.717'W, 96 m, 24.ix.2014, leg. Short, Salisbury, and La Cruz, margins of basecamp creek, GY14-0924-01A (2 exs., SEMC); same data as previous except, 21.ix.2014, leg. Short Salisbury and La Cruz, muddy detrital pools in drying creek bed near camp, GY14-0921-02A (1 ex., SEMC).

Differential diagnosis.

See differential diagnosis for C. amplius .

Description.

Size and color. Total body length 4.5-4.9 mm. Body form elongate oval with slightly curved lateral margins. Dorsum of head multi-colored, frons dark brown, clypeus dark orange-brown, labrum pale yellow-orange (Fig. 9C View Figure 9 ). Pronotum red-orange, elytra pale orange-brown with serial dark brown spots. Head. Ground punctation on head fine. Clypeus with anteroposterior emargination that exposes a wide trapezoidal shaped gap between clypeus and labrum (Fig. 9C View Figure 9 ). Mentum moderately depressed in anterior half with subtriangular anteromedial notch. Maxillary palps long, longer than width of head immediately posterior to eyes. Thorax. Ground punctation on pronotum fine. Prosternum mildly tectiform. Mesoventrite with weak elevation forming a posteromedial longitudinal carina. Metafemora densely pubescent in basal nine-tenths. Aedeagus. Aedeagus (Fig. 14D View Figure 14 ) with median lobe widest at base, and very slightly tapering until the apical quarter, then narrowing abruptly to form an acute triangular apex which is even with or appears very slightly extended beyond the apex of the parameres. Sclerite of the median lobe not expanded. Gonopore situated less than half of one gonopore width below the apex of the median lobe. Parameres symmetrical, with outer margins straight, with apex slightly inwardly curved and bluntly rounded. Basal piece long, ca. four-fifths the length of the parameres.

Etymology.

The species is named after the Berbice River in Guyana from where was collected. To be treated as a noun in apposition.

Distribution.

Known only from the type locality along the upper Berbice River in Guyana (Fig. 17 View Figure 17 ).

Biology.

This species was collected in detrital leaf packs along the margin of the upper Berbice River (Fig. 22A View Figure 22 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydrophilidae

Genus

Chasmogenus

Loc

Chasmogenus berbicensis

Smith, Rachel R. & Short, Andrew Edward Z. 2020
2020
Loc

Chasmogenus

Sharp 1882
1882