Abstract
The South American species of the New World genus Bidessonotus Régimbart, 1895 are reviewed with descriptions of seven new species. This brings the total number of valid Bidessonotus species to 37, making it the largest Bidessini genus in the New World. The new species are Bidessonotus annae sp. n. (Venezuela), Bidessonotus josiahi sp. n. (Venezuela), Bidessonotus palecephalus sp. n. (Venezuela), Bidessonotus reductus sp. n. (Venezuela), Bidessonotus septimus sp. n. (Venezuela), Bidessonotus spinosus sp. n. (Venezuela), and Bidessonotus valdezi sp. n. (Guyana, Suriname). New distribution records are provided for many other South American Bidessonotus species. The main diagnostic features of Bidessonotus species are in the male genitalia, and these are illustrated for all South American species. Diagnostic features, distributions (including distribution maps), and additional comments are provided for all South American species.
Highlights
The New World Bidessini genus Bidessonotus Régimbart (Coleoptera: Dytiscidae: Hydroporinae) included, prior to this paper, 30 species, making it one of the largest genera in the tribe in the New World with only Neobidessus Young (30 species) and Liodessus Guignot (27 species) comparable in size
Young (1990) thought this species is similar to B. obtusatus
Young (1990) thought the species is related to B. pollostus, B. rubellus, B. dubius and B. ploterus
Summary
The New World Bidessini genus Bidessonotus Régimbart (Coleoptera: Dytiscidae: Hydroporinae) included, prior to this paper, 30 species, making it one of the largest genera in the tribe in the New World with only Neobidessus Young (30 species) and Liodessus Guignot (27 species) comparable in size. Many Bidessonotus species are widespread, others are relatively narrowly distributed, and new species are likely to be discovered with additional collecting efforts in undercollected areas of South America. Collecting in poorly known areas of northern South America during the past decade has led to discovery of seven previously undescribed species of Bidessonotus, and these are described here. This brings the number of known species to 37. Young (1990) was unable to write a suitable key because the diagnostic features of species are coloration, New species of Bidessonotus Régimbart, 1895 with a review of the South American species... The best way to identify species is to compare male genitalia against the illustrations and use distribution information
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