Heterochrony in Shell Sculpture Development within the Ostracode Genus Hemicythere

Heterochrony in Shell Sculpture Development within the Ostracode Genus Hemicythere The evolutionary issues of taxonomic significance of the shell sculpture in Ostracoda are addressed. This is a comparative ontogenetic study of three types of lateral sculpture (fossa-mural reticulation, punctation, and foveolation), as well as flanges, ridges, and tubercles is made in different age stages and morphological variations of three ostracode species with different strengths of the expression of sculpture: Hemicythere borealis (Brady, 1868), H. villosa (Sars, 1866), and H. nana (Schornikov, 1974). It is shown that the development of each sculpture type proceeds relatively independently and represents a mosaic; developmental stages are accompanied by numerous heterochronies. This results in many parallelisms, and even the trend of the evolution of a structure can change. The pathways of morphological evolution of Hemicythere species are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Heterochrony in Shell Sculpture Development within the Ostracode Genus Hemicythere

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Life Sciences; Freshwater & Marine Ecology
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