Primocerus neutrum
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Ordo: Coleoptera
Familia: Hydrophilidae
Genus: Primocerus
Name
Primocerus neutrum Girón & Short, 2019 sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype (♂): “VENEZUELA: Bolívar/ 6°2'10.5"N, 61°23'57.8"W; 630 m/ along La Escalera; rocky stream/ 31.vii.2008; leg. A. Short, M. García, L. Joly/ AS-08-058” (MIZA). Paratypes (20): GUYANA: Region 8: “4°43'49"N, 59°1'35"W; 300 m/ Iwokrama Forest, Pakatau hills/ flight intercept trap; 26–29.v.2001/ leg. R. Brooks & Z. Falin; GUY1BF01 063” (SEMC, 1); “5°0.730'N, 59°38.965'W; 585 m/ Upper Potaro camp I, c. 7 km NW Chenapau, Ridge Trail/ 11.iii.2014; leg. Short, Baca, Salisbury; GY14-0311-02A” (CBDG, SEMC, 11); “5°18.261'N, 59°50.257'W; 687 m/ Ayanganna Airstrip, trail from airstrip to Ayanganna/ forest detrital pools; 17.iii.2014/ leg. A. Short; GY14-0317-01A” (SEMC, 1); same except “18.iii.2014, GY14-0318-01B” (SEMC, 1); same except “seepage area over rocks in forest flowing into stream, GY14-0318-01C” (SEMC, 1). SURINAME: Sipaliwini District: “3°53.942'N, 56°10.849'W; 733 m/ CSNR: Tafelberg Summit, nr. Caiman Creek Camp/ pools in forest; 19.viii.2013/ leg. Short & Bloom; SR13-0819-05B” (SEMC, DNA voucher specimen SLE 1085). VENEZUELA: Bolívar: Same data as holotype (MIZA, SEMC, 8, including DNA voucher SLE 529).
Differential diagnosis
Primocerusneutrum can be regarded as very plain in appearance, lacking remarkable features. It can be distinguished among similarly sized species with shallowly punctured elytra by its dark brown coloration and simple transverse ridge on the posterior elevation of the metaventrite.
Description
Body length 2.6–3.5 mm, width 1.4–1.9 mm. Body elongate oval, moderately convex (Fig. 11F). General coloration brown. Elytra with ground punctures very shallowly marked. Posterior elevation of mesoventrite with simple curved transverse ridge. Metafemora with hydrofuge pubescence covering nearly basal 4/5 of anterior surface. Apex of fifth abdominal ventrite slightly emarginate. Aedeagus (Fig. 14D) with basal piece nearly 1.25–1.35 × longer than parameres; parameres slightly longer than median lobe, truncate to rounded and obliquely directed at apex; apex of median lobe somewhat “pinched” and narrowly pointed.
Etymology
Named with the Latin word neutrum meaning neutral, in reference to the comparatively unremarkable appearance of the species.
Distribution
Primocerusneutrum has been collected at the locality known as La Escalera in the Venezuelan Amazon, the Upper Potaro region and the Iwokrama Forest in Guyana, and the Tafelberg summit in Suriname. Specimens have been collected at elevations of 300–733 m (Fig. 15A).
Remarks
This species has been collected in detrital pools in densely forested areas, typically associated with streams (Fig. 16C).
Original Description
- Girón, J; Short, A; 2019: Three additional new genera of acidocerine water scavenger beetles from the Guiana and Brazilian Shield regions of South America (Coleoptera, Hydrophilidae, Acidocerinae) ZooKeys, 855: 109-154. doi
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