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Ascidians serve as hosts for a number of symbiotic copepod species from a variety of families (Gotto, 1979; Illg and Dudley, 1980). These copepods are often specialized in their morphology and can differ con- siderably from the basic copepod form. The life history and population biology of sym- biotic copepods within ascidians is still poorly known. Species of the genera Doro- pygus and Pachypygus can have two types of males, atypical and typical, and the male development depends on the age of the as- cidian host (Dudley, 1966; Hipeau-Jac- quotte, 1980, 1988). Some symbiotic spe- cies show a life cycle synchronized to that of their annual host (Gage, 1966; Egan, 1984), while others have life cycles more similar to planktonic copepod species (Sva- varsson, 1990). The ascidian Polycarpa pomaria (Savig- ny, 1816) occurs from shallow waters to depths of 450 m, and is known from the Mediterranean to Svalbard and Iceland in the north (Berrill, 1950). It is a fairly large species, up to 7 cm in greatest diameter and height (Millar, 1966, 1970). The population biology of two copepod species found with- in Polycarpa pomaria, Doropygus pulex Thorell, 1859, and Gunenotophorus globu- laris Buchholz, 1869, is discussed
Journal of Crustacean Biology – Brill
Published: Jan 1, 1993
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