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Abstract
In order to understand the identity of the Central American species of the genus Phaenonotum Sharp, 1882, the type specimens of the species described by Sharp (1882) deposited in the David Sharp collection in the Natural History Museum in London have been re-examined. The following species are redescribed: Phaenonotum apicale Sharp, 1882, Phaenonotum collare Sharp, 1882, Phaenonotum dubium Sharp, 1882 (confirmed as junior synonym of Phaenonotum exstriatum (Say, 1835)), Phaenonotum laevicolle Sharp, 1882, Phaenonotum rotundulum Sharp, 1882 and Phaenonotum tarsale Sharp, 1882. Lectotypes are designated for Phaenonotum apicale, Phaenonotum collare, Phaenonotum rotundulum and Phaenonotum tarsale. External diagnostic characters and morphology of male genitalia are illustrated. A table summarizing diagnostic characters allowing the identification of the species is provided.
Highlights
The genus Phaenonotum Sharp, 1882 was described by the British specialist on water beetles, David Sharp, in his treatment of the Central American hydrophilid fauna in the famous Biologia Centrali–Americana
The monotypic genus Hydroglobus Knisch, 1921 from Argentina was considered a part of Phaenonotum by Archangelsky (1991), but this was not followed by subsequent authors
Orchymont (1937) considered P. laevicolle as a junior synonym of P. globulosum described from Colombia, based on the study of the type specimens of both taxa. He only compared external characters used for diagnosis of Phaenonotum species at that time, and did not study ventral morphology and male genitalia, which are crucial characters for species identification
Summary
The genus Phaenonotum Sharp, 1882 was described by the British specialist on water beetles, David Sharp, in his treatment of the Central American hydrophilid fauna in the famous Biologia Centrali–Americana. A few other species originally described in other genera were later assigned to Phaenonotum by other authors (Knisch 1924; Orchymont 1937) and few additional species were described subsequently from Brazil (Orchymont 1937, 1943), Argentina (Bruch 1915), Venezuela (Archangelsky 1989), U.S.A (Smetana 1978) and Cuba (Deler-Hernández et al 2013). The lectotype of P. laevicolle Sharp, 1882 was designated by Smetana (1976), but without providing any information about the identity of that species. In the course of the review of Phaenonotum from the Greater Antilles, it was necessary to study the identities of the Central American species of the genus described by D. The lectotypes have been designated in order to fix the identity of the species for future studies
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