New Calanoid Copepods of Pontella Dana and Labidocera Lubbock with Notes on the Distribution of the Genera in the Gulf of Mexico

Résumé du livre

Descriptions are presented for three new calanoid copepods taken in the Gulf of Mexico during plankton collecting operations of the U. S. Fish and Wildlife Service: Pontella mimocerami, n. sp., is related to P. cerami Scott; P. polydactyla, n. sp., is close to P. lobiancoi (Canu); Labodocera mirabilis, n. sp., resembles L. detruncata (Dana). Records of previously known species of Pontella Dana and Labidocera Lubbock that appeared in the numerous plankton samples under consideration are charted. Their distributional patterns in the Gulf of Mexico are discussed. From the available evidence the more abundant and widespread of the species within each genus tend to be separated environmentally from one another. In Labidocera, aestiva Wheeler is temperate-neritic, scotti Giesbrecht is tropical-neritic, and acutifrons (Dana) is tropical-oceanic. In Pontella, meadi Wheeler is temperate-neritic, mimocerami is tropical-neritic, and spinipes Giesbrecht is tropical-oceanic. The remaining species, Pontella polydactyla, Labidocera neri (Krøyer), and L. mirabilis appear to be transients in the easternmost portions of the Gulf region.