Silversides of the genus Labidesthes (Atheriniformes: Atherinopsidae).

The two species of Labidesthes, L. sicculus and L. vanhyningi, are herein redescribed. Labidesthes sicculus is separated from L. vanhyningi by the presence of an anterolateral process of the post temporal that is longer than it is wide (versus wider than long), a ratio of thoracic length to abdominal length greater than two (versus less than two), and a midlateral stripe that is narrows in front of first dorsal fin (versus expanding in front of first dorsal fin). Labidesthes sicculus is found in Gulf of Mexico drainages from the Brazos River East to the Pascagoula River, Mississippi River (absent in middle and upper Missouri River), and Great Lakes-St. Lawrence River (absent in Lake Superior). Labidesthes vanhyningi is found in Gulf Mexico drainages from the Neches River East around peninsular Florida North on the Atlantic Coast to the Pee Dee River, in the Mississippi River it is confined to lowland areas of the Lower Mississippi River.

Three new species of saddled loricariid catfishes, and a review of Hemiancistrus, Peckoltia, and allied genera (Siluriformes).

Three new species of saddled hypostomine loricariids are described. According to a recent phylogenetic analysis, these species are members of the genus Peckoltia. The species differ from all described Peckoltia except Peckoltiafurcata and Peckoltiasabaji by having the dentaries meet at an angle greater than 90°. The species also have similarities to Hemiancistrus, and can be separated from all described species by having dorsal saddles. We discuss the taxonomy of Peckoltia, Hemiancistrus, and allied genera and recognize Ancistomus as valid for Peckoltiafeldbergae, Hemiancistrusmicrommatos, Ancistrussnethlageae, Hemiancistrusspilomma, and Hemiancistrusspinosissimus. We recommend descriptions of genera for several clades of Hemiancistrus and restriction of Hemiancistrus to the type species of the genus, Hemiancistrusmedians. Chaetostomusmacrops is transferred to Pseudancistrus and recognized as a junior synonym of Pseudancistrusmegacephalus. The Hemiancistrusannectens group of species (Hemiancistrusannectens, Hemiancistrusargus, Hypostomusaspidolepis, Hemiancistrusfugleri, Hemiancistrusholostictus, Hemiancistrusmaracaiboensis, Hemiancistruspanamensis, Hemiancistruswilsoni) are recognized in Hypostomus. Multivariate analysis reveals that the newly described species differ from one another in shape space, but overlap broadly with other Peckoltia (Peckoltialujani), narrowly with other Peckoltia (Peckoltiagreedoi), or broadly with Etsaputu (Peckoltiaephippiata).