New species and records of Chasmogenus Sharp, 1882 from the southwestern margin of the Guiana Shield (Coleoptera: Hydrophilidae: Acidocerinae) Author Glynn, Rachel D. Author Short, Andrew Edward Z. text Zootaxa 2021 2021-10-07 5048 3 435 443 journal article 4051 10.11646/zootaxa.5048.3.8 e80cf6ad-d7b3-48a3-9527-5c3e2c4cd83c 1175-5326 5556559 B1B24583-1DFC-49BA-BDF7-A48F3D74E7E2 Chasmogenus acuminatus Smith & Short, 2020 New material examined (21): BRAZIL : Amapá : Oiapoque, (c. 22 km S on BR-156), 3.65822°, -51.76958°, 17 m , 20.vii.2018 , leg. Short, forested detrital pool, BR18-0720-01B ( 9 exs. , INPA , SEMC ). Pará : Alenquer, Vale do Paraíso, ca. 55 km N of Alenquer, -1.49292 , -54.51566 , 150 m , 3.ii.2018 , leg. A. Short, isolated detrital pool in rocks next to river, BR18-0203-01B ( 9 exs. , INPA , SEMC ).