A new species, Gochnatia hiriartiana Medrano, Villaseñor & Medina (Asteraceae, tribe Mutisieae), of the desert scrubland of the state of Hidalgo, Mexico, is described. Its distinctive morphological traits are discussed and compared with the other Mexican species of the genus…

Six new species of Leptoglossus Guerin from Brazil, Costa Rica, Mexico, Peru, and Venezuela are described. Diagnostic taxonomic characters of antennal segments, legs, male genital capsules, and dorsal views of some species are illustrated. Most of the species are placed…

The type species of Acolhua is discussed. The specimens considered to represent the type species Acolhua championi Distant by Slater & Brailovsky (1986) are shown to represent a previously undescribed species described as A. barrerai new species. The actual type…

Recent surveys of the plethodontid salamander fauna of Oaxaca, Mexico, disclosed the existence of a new, morphologically distinct arboreal species of the genus Pseudoeurycea. The new species, described here, is from the Sierra Mazateca in northern Oaxaca. Sequences of 1833…

Pelecitus meridionaleporinus n. sp. from the Tehuantepec jackrabbit is described. The new species differs from Pelecitus helicinus (Molin, 1860) in having delicate transverse striations, a salient vulva , and a readily apparent preesophageal ring; P. hellcinus has teardrop cellsaroundthe vulva,…

Oligogonotylus mayae n.sp. is described from the intestine of the Mayan cichlid Cichlasoma urophthalmus (Günther) in Ría Lagartos, Ría Celestún, and Estero Progreso, Yucatán State. This is the second species described for Oligogonotylus Watson, 1976, the other being O.manteri Watson,…

Heteromyoxyuris otomii n. sp., which inhabits the intestinal caecum of Perognathus flavus (Heteromyidae), in Zaragoza, Hidalgo, Mexico, is described. This new species differs from the 2 other congeneric species in the morphology and length of lateral alae in males. Heteromyoxyuris…

The taxonomy of the New World species of the genus Trichadenotecnum is revised. A total of 44 species, including 29 new species, were treated. These species are classified into 12 monophyletic species groups, eight of them newly proposed here. Two…

A new genus and species of nematode, Caranginema americanum n. gen., n. sp. (Philometridae), are described from gravid, subgravid, and nongravid female specimens collected from the subcutaneous tissue of the fish (crevalle jack) Caranx hippos (Carangidae, Perciformes) from the coral…

A new species of Crassicutis Manter, 1936 is described from the Sinaloan cichlid Cichlasoma beani (Jordan) (Osteichthyes: Cichlidae) in the upper Rıo Santiago basin. Crassicutis choudhuryi n. sp. differs from most of the other nominal species by having testes located…