New Neotropical and Nearctic species of water beetles in the genera Hydraena Kugelann and Ochthebius Leach, a key to North American genera and subgenera of the family, new distribution records, and a synopsis of ecology, behavior and morphology related to aquatic life (Coleoptera: Hydraenidae).

Twenty-six new species of Hydraenidae are described, including new species from Belize (2), Mexico (16), Panama (3), St. Vincent (1), and the U.S.

Thirty-three new species of water beetles in the genus Hydraena Kugelann from Cameroon (Coleoptera: Hydraenidae).

Thirty-three new species of Cameroonian water beetles in the genus Hydraena Kugelann are described, based on the examination and databasing of 355 specimens from 19 localities/events. Male genitalia are illustrated, and high resolution habitus images of the holotypes are provided, as are distribution maps. The following new species of Hydraena are described: H.

Taxonomic revision of African water beetles in the genus Ochthebius Leach (1815), subgenus Aulacochthebius Kuwert (1887) (Coleoptera: Hydraenidae).

The African species of the water beetle genus Ochthebius Leach (1815), subgenus Aulacochthebius Kuwert (1887) are revised. Nine new species are described, based on the examination and databasing of 5,911 specimens from 101 localities. Male genitalia are illustrated, and high resolution habitus images of the holotypes and specimens of previously described species are provided.

Taxonomy of water beetles in the genus Hydrochus Leach, 1817, from Bolivia, Brazil and Paraguay (Coleoptera: Hydrochidae).

The taxonomy of Bolivian, Brazilian and Paraguayan water beetles in the genus Hydrochus Leach, 1817 is presented. The known fauna now consists of 77 species, 37 of which are described as new species. The new species are diagnosed, and high-resolution images of the habitus and male genitalia of each species are given, as are distribution maps.

Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae).

The taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 is presented, including the Mexican fauna. The known fauna now consists of 26 species, nine of which are described as new species. The new species are diagnosed, and high-resolution images of the habitus and male genitalia of each species, and detailed descriptions of the male genitalia are given.

Taxonomy of Peruvian water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae).

The taxonomy of Peruvian water beetles in the genus Hydrochus Leach, 1817 is presented. The known fauna now consists of 22 species, 14 of which are described as new species. The new species are diagnosed, and high-resolution images of the habitus and male genitalia of each species are given.

Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae).

Three new species of the very rarely collected water beetle genus Adelphydraena Perkins, 1989 are described from Brazil, Guyana, and Suriname. Illustrations of the male genitalia of the two previously known species in the genus, A. orchymonti Perkins and A.

Taxonomy of Ecuadorian water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae).

The taxonomy of Ecuadorian water beetles in the genus Hydrochus Leach, 1817 is presented. The known fauna now consists of 12 species, six of which are described as new species. The new species are diagnosed, and high-resolution images of the habitus and male genitalia of each species are given.

Taxonomy of Venezuelan water beetles in the genus Hydrochus Leach, 1817, and an analysis of male genitalia morphology (Coleoptera: Hydrochidae).

The taxonomy of Venezuelan water beetles in the genus Hydrochus Leach, 1817 is presented. The known fauna now consists of 26 species, 17 of which are described as new species. All species are described, or redescribed, diagnosed, and high-resolution images of the habitus and male genitalia of each species are given.

Type designations for Neotropical water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae).

Lectotypes are designated for the following species of Neotropical Hydrochus Leach, 1817: H. argutus Knisch, H. corruscans Bruch, H.

Hydrochus spanglerorum n. sp., a remarkable, highly derived species from Brazil, Guyana, and Suriname (Coleoptera: Hydrochidae).

A new species of Neotropical Hydrochus, H. spanglerorum n. sp.

New Myxophagan water beetles from Madagascar (Coleoptera: Torridincolidae, Hydroscaphidae).

Myxophagan water beetles from Madagascar are comprehensively revised. Holotypes of the two previously known species are re-described and illustrated. Six new species of Incoltorrida Steffan and one new species of Hydroscapha LeConte are described and illustrated.

A new genus and new species of Meropathina from Lord Howe Island (Coleoptera: Hydraenidae).

Prototympanogaster new genus and P. lordhowensis new species (Hydraenidae: Ochthebiinae: Meropathina), are described based on two male specimens collected on Mount Lidgbird, Lord Howe Island, Australia. The new genus is related to the Australian genus Tympanogaster Perkins 1979, but lacks the diagnostic metaventral tabella of members of that genus.

Hydraenidae of Madagascar (Insecta: Coleoptera).

The Madagascar fauna of the beetle family Hydraenidae is comprehensively revised, based on the study and databasing of 6,949 specimens. New collection records are provided for 11 previously described species, and 95 new species are described. Three new subgenera of Hydraena, viz.

Ascites and other incidental findings revealing undiagnosed systemic rheumatoid arthritis.

We describe a case of a 43-year-old man presenting to the gastroenterology outpatient department with exudative ascites. Mediastinal lymphadenopathy, pericardial effusion and pleural effusion were detected on further imaging. Further clinical examination revealed subcutaneous nodules on the left arm, which were confirmed to be rheumatoid nodules on histology.

Taxonomy of the water beetle genus Limnebius Leach in southern Africa (Coleoptera: Hydraenidae).

The southern African species of the water beetle genus Limnebius Leach, 1815, are revised. Eleven new species are described, based on the examination and databasing of 6,201 specimens from 96 localities/events. Male genitalia are illustrated, and high resolution habitus images of the holotypes are provided.

A revision of the water beetle genus Hydraena Kugelann for southern Africa (Coleoptera: Hydraenidae).

The southern African species of the water beetle genus Hydraena Kugelann, 1794, are revised. Twenty-eight new species are described, and redescriptions and new collection records are given for three previously described species, based on the examination and databasing of 11,534 specimens from 488 localities/events. Male genitalia are illustrated, and high resolution habitus images of the holotypes are provided.

Granulomatous dermatitis due to Malassezia sympodialis.

A 67-year-old man, with multiple skin lesions that appeared over 2 years, had biopsies that disclosed granulomatous dermatitis with associated small yeasts. The urinary antigen test results were negative for Histoplasma infection; cultures from the biopsies did not grow any fungi or other potential pathogens. The chest roentgenogram results were normal.