Jennifer C. Girón

Revision of the Neotropical water scavenger beetle genus Globulosis García, 2001 (Coleoptera: Hydrophilidae: Acidocerinae)

The Neotropical water scavenger beetle genus Globulosis García, 2001 is revised. Originally described from a single male specimen from southeastern Venezuela, the genus has since been found in localities across the Guiana Shield region and beyond, including Colombia, Suriname, Guyana, and Brazil. The genus is redescribed. Morphological characters and genetic data from the mitochondrial gene COI from ten populations across its range provide support for two distinct species, corresponding loosely to geography. The type species, G. hemisphericus García, is redescribed and newly recorded from Guyana, Suriname, and Brazil (Amazonas, Para). One new species is described, Globulosis flavus sp. n. from southwestern Venezuela (Amazonas, Bolivar). The genus is associated with lotic habitats, and typically found along the margins of small to medium sized streams. High-resolution habitus and aedeagal images and distribution maps for all species are provided.

Revision of the Neotropical water scavenger beetle genus Quadriops Hansen, 1999 (Coleoptera, Hydrophilidae, Acidocerinae)

Abstract The genus Quadriops Hansen, 1999 is revised and redescribed. The genus is found to contain six species, including two that are here described as new: Quadriops clusia sp. n. (Brazil, Guyana, Suriname) and Q. acroreius sp. n. (Suriname, French Guiana). Two species are found to be junior subjective synonyms of Q. depressus Hansen, 1999: Q. amazonensis García, 2000, syn. n. and Q. politus Hansen, 1999, syn. n. The male of Q. similaris Hansen, 1999 is described for the first time. New records are provided for Q. dentatus Hansen, 1999, Q. reticulatus Hansen, 1999, and Q. similaris. All species are described and illustrated in detail. Most species are confirmed as having a terrestrial way of life, with several species being found in rotten fruits, sap flows, and dead wood. Furthermore, we discuss ecological trends of the species given their collecting information.

Review of the Helochares ( Hydrobaticus ) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae)

New World species assigned to the Helochares subgenus Hydrobaticus MacLeay are reviewed based on adult morphology and DNA sequence data. Nine species are recognized, including five here described as new: Helochares (Hydrobaticus) laevis n. sp. (Mexico), H. (Hydrobaticus) nexus n. sp. (Ecuador, Panama, Venezuela), H. (Hydrobaticus) politus n. sp. (Guatemala), H. (Hydrobaticus) trujillo n. sp. (Venezuela), and H. (Hydrobaticus) zamora n. sp. (Ecuador). New records are provided for the three previously described species: Helochares (Hydrobaticus) championi Sharp, 1882 (Costa Rica, Guatemala, Nicaragua), H. (Hydrobaticus) maculicollis Mulsant, 1844 (United States), and H. (Hydrobaticus) normatus (LeConte, 1861) (United States to Costa Rica). A ninth species, known only from five poorly preserved female specimens from Peru, is left undescribed until additional material can be found. Most species are known to exhibit some parental care, with the egg case being attached to the abdomen of and carried by the female. Intraspecific genetic distances within several species are very high, in some cases more than 8% in the mitochondrial gene COI, suggesting there may be additional cryptic species remaining to be identified. All taxa are illustrated and a key to species is provided.

Three new genera of acidocerine water scavenger beetles from tropical South America (Coleoptera, Hydrophilidae, Acidocerinae)

Abstract Recent collecting efforts in the Neotropics have led to the discovery of numerous new species and lineages of aquatic beetles. Here, three new genera are described to accommodate fifteen new species of water scavenger beetles of the subfamily Acidocerinae from northern South America: Crucisternum gen. n. for C. escalera sp. n. (Venezuela), C. ouboteri sp. n. (Guyana, French Guiana, Suriname, Venezuela), C. queneyi sp. n. (French Guiana), C. sinuatus sp. n. (Brazil), C. toboganensis sp. n. (Venezuela), C. vanessae sp. n. (Suriname), and C. xingu sp. n. (Brazil); Katasophistes gen. n. for K. charynae sp. n. (Peru), K. cuzco sp. n. (Peru), K. merida sp. n. (Venezuela) and K. superficialis sp. n. (Ecuador); and Nanosaphes gen. n. for N. castaneus sp. n. (Brazil), N. hesperus sp. n. (Suriname), N. punctatus sp. n. (Guyana), and N. tricolor sp. n. (Guyana, Suriname). It was also found that the monotypic Neotropical endemic genus Dieroxenus Spangler, 1979, syn. n. is congeneric with Chasmogenus Sharp, 1882 resulting in the single new combination Chasmogenus cremnobates (Spangler, 1979), comb. n.. Katasophistes merida sp. n. is known exclusively from seepage habitats, while the remaining taxa described herein are primarily associated with the margins of densely forested streams. Diagnoses, illustrations, distribution maps, and habitat summaries are provided for all new genera and species. A key to the genera of Acidocerinae of the New World is provided.