Abstract:Aeginecta longicauda n. gen., n. sp. is described from material collected from a seasonally astatic aquatic habitat in Argentina. It is only known from the type locality and two male specimens; at this point the female remains unknown. Specific unique gonopod and genital segment features demonstrate that this taxon represents a unique genus within the Thamnocephalidae. Aeginecta n. gen most closely resembles Phallocryptus Biraben, 1951 and Thamnocephalus Packard, 1877. This new genus is easily diagnosed by the… Show more
The current systematics of the large branchiopod crustaceans are reviewed in relation to other crustacean groups and from class to genus level. Calmanostraca and Diplostraca are raised to superorder, and †Kazacharthra and Notostraca are both treated as orders. Problems and needs regarding the systematics of large branchiopods are presented and discussed, with suggestions for moving forward, stressing the need for modern methods and defensible taxonomic definitions. Subdividing taxonomic categories may or may not be warranted, but should never be based on only one gene, or on limited taxon sampling. Furthermore, splitting species out as new genera, when the original genus is poorly defined can only lead to future problems.
The current systematics of the large branchiopod crustaceans are reviewed in relation to other crustacean groups and from class to genus level. Calmanostraca and Diplostraca are raised to superorder, and †Kazacharthra and Notostraca are both treated as orders. Problems and needs regarding the systematics of large branchiopods are presented and discussed, with suggestions for moving forward, stressing the need for modern methods and defensible taxonomic definitions. Subdividing taxonomic categories may or may not be warranted, but should never be based on only one gene, or on limited taxon sampling. Furthermore, splitting species out as new genera, when the original genus is poorly defined can only lead to future problems.
Over the course of my career I have described nine Branchiopod genera and one subgenus, either alone or with other researchers. From these, four genera and the subgenus belong to Anostraca. But I was remiss in designating type species for one of those taxa which caused the name to become unavailable. This short communication is to rectify this unfortunate error on my part.
En el presente estudio se registra por primera vez Thamnocephalus venezuelensis Belk y Pereira, 1982 en La Guajira, norte de Colombia. La especie fue recolectada en charcas temporales de dos localidades. Este estudio agrega información sobre un rasgo presente en el oviducto de las hembras de T. venezuelensis no mencionado hasta ahora, el cual puede estar relacionado con la población de la localidad, y extiende la distribución de esta especie a Colombia.
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