Abstract
The structure of the oncomiracidia of gill parasites Diclidophora merlangi, D. luscae and D. denticulata is described. The three larvae differ in body length and in the size and arrangement of the hooks but the glandular components and excretory systems are similar. There is some evidence that glandular secretions aid hatching. In newly hatched larvae of D. merlangi marginal hook III is displaced and a pouch of tissue occurs between hooks II and IV. The pouches are presumptive clamp tissue. Many larvae fail to hatch in vitro but form one pair of clamps while within the egg capsule.
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