A new species of Chasmogenus Sharp, 1882 and new records of Hydrophilidae (Coleoptera) from Northeastern Brazil Author Alves, Tayná 0000-0001-8999-6665 Laboratório de Biodiversidade, Campus Heróis do Jenipapo, Universidade Estadual do Piauí (UESPI) https://orcid.org/0000-0001-8999-6665 tayalvesk3@gmail.com Author Clarkson, Bruno 0000-0001-9495-5809 Laboratório de Biodiversidade Entomológica, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (Fiocruz) https://orcid.org/0000-0001-9495-5809 brclarckson@gmail.com Author Lima, Lucas Ramos Costa 0000-0001-5943-3351 aboratório de Biodiversidade, Campus Heróis do Jenipapo, Universidade Estadual do Piauí (UESPI) https://orcid.org/0000-0001-5943-3351 lucaslima_86@hotmail.com text Zootaxa 2020 2020-04-15 4763 4 579 586 journal article 22880 10.11646/zootaxa.4763.4.7 98d83e6d-0af6-46a8-ae3c-244299146a68 1175-5334 3762188 urn:lsid:zoobank.org:pub:FCEAA2D4-789B-455E-AC96-517918EA8F69 Hydrobiomorpha spatula Bachmann, 1988 Figs. 13–14 , 17–18 Material examined. 1 ♂ Brazil , Piauí State , Piripiri Municipality, Cachoeira do Bota Fora, 4°12’51.1”S , 41°40’01.7”W , 01. VI .2019 . FIGURES 9–14. Habitus of hydrophilids found in the State of Piauí, Brazil. 9–10) Enochrus sp.: 9, dorsal view; 10, ventral view. 11–12) Helochares ( Sindolus ) femoratus (Brullé, 1841) : 11, dorsal view; 12, ventral view. 13–14) H ydrobiomorpha spatula Bachmann, 1988: 13 , dorsal view; 14, ventral view. Diagnosis. Head, pronotum and elytra black ( Fig. 13 ). Pronotum with very dense and regular fine punctation ( Fig. 13 ). Prosternum strongly carinate, with elevated and glabrous central area; anterior extremity rounded and posterior extremity slightly projected ( Fig. 14 ). Elytron with systematic punctations reduced, barely visible; lateral margin with irregular punctations, some with short setae. Meso- and metasterna fused and elevated, forming a sternal keel ( Fig. 14 ); anterior extremity without indentation and posterior extremity not exceeding the half of the first ventrite. Keel slightly thickened in the metasternal region. Femora glabrous. Ventrites II–V pubescent, with medial area glabrous ( Fig. 14 ). Genitalia as in figures 17–18. Distribution. Brazil , State of Bahia . New record for the state of Piauí : Piripiri municipality.