Systematics of Planktomya, a Bivalve Genus With Teleplanic Larval Dispersal
The small bivalve Planktomya henseni Simroth, 1896 (type species of Planktomya Simroth, 1896), originally described as a pelagic species from the North Atlantic and later recognized as a benthic Caribbean species, is redescribed and figured. New material from the Gulf of Mexico, and a possibly conspecific specimen from the Cape Verde Islands are reported. The eastern Atlantic species Nesis prima Locard, 1899 (type species of Nesis Locard, 1899), is assigned to Planktomya on the basis of larval shell morphology. The generic name Planktomya has precedence over Nesis (preoccupied) and over the replacement name Monterosatus Beu, 1971. Planktomya prima, which was described from the continental shelf of Bay of Biscay, occurs south to Senegal and Guinea. A new species of Planktomya is described from southern Angola. The systematic position of Planktomya is discussed on the basis of characters of the hinge, ligament and pallial line, and it is concluded that it should be placed in the Montacutidae, near Tellimya Brown, 1827. The current placement of Monterosatus in the Mesodesmatidae is rebutted. The pattern of larval dispersal, with teleplanic larvae, is briefly discussed and noted to be an extreme case of r-strategy, in which large quantities of larvae never reach an appropriate substrate on the shelf to metamorphose.
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Document Type: Research Article
Publication date: 2000-11-01
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