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Agave montiumsancticaroli is described and illustrated as a new species from the Sierra de San Carlos Region, Tamaulipas, Mexico. The new species belongs to the Marginatae group, and is similar to Agave glomeruliflora (Engelm.) A. Berger., Se describe e ilustra…

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 species, Habranthus medinae L. O. Alvarado & GarcíaMendoza (Amaryllidaceae, Hippeastreae), from the state of Puebla, Mexico, is described. The new species is similar to H. tubispathus (L'Héritier) Traub, but can be distinguished by the larger size of the…

Rhabdias kuzmini n. sp., a parasite of the lungs of Bufo occidentalis, is described and illustrated. This Mexican taxon differs from the related species in the genus by the possession of 4 lips (2 subdorsal and 2 subventral) and 2…

Dalea schiblii Medina & M. Sousa (Fabaceae, Amorpheae), a new arborescent species from Pinus L.–Quercus L. forest in the state of Oaxaca, Mexico, is described and illustrated. Its morphological characteristics are discussed and compared to those of other Mexican species…

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…

Marsdenia magallanesiana JuárezJaimes, a new species from the state of Jalisco, Mexico, is described and illustrated here; it is compared with M. edulis S. Watson and M. callosa Juárez-Jaimes & W. D. Stevens, which are the morphologically most similar species…