Gonophores


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Gonophores

 

modified individuals in the colonies of hy-droid polyps and siphonophores in which the sex products are formed.

Gonophores are in effect underdeveloped medusae that remain attached to the trunk of the colony, with a closed bell, without radial canals and tentacles, and usually without a proboscis. Gonophores are dioecious, and the sex products, formed from the ectoderm and lining the cavity of the gonophore, emerge to the outside through a cleft in the body wall.

References in periodicals archive ?
5 mm high, gonophores observed [N 1753]; Itaparica Island, Mar Grande region, on coral reef building, 10.
1995, 1-2 m depth, nine colonies, up to 2 mm high, with male gonophores [N 1792]; Itaparica Island, Berlinque Beach, on shallow coral reef bank, 11.
Material studied: Northern Coast, Emissario Beach, on internal beach rock bank, 15th November 1995, 3 m depth, thirteen colonies, 3-4 mm high, with gonophores [N 1795]; Guarajuba Beach, on the sponge Dysidea variabilis from the shallow bank reef, 10th April 1996, 19 m depth, three colonies, gonophores not seen [N 1796].
Their relatively large polyps have been excellent subjects for biological studies in areas such as regeneration (Barth, 1940; Tardent and Eymann, 1958), early development of the gonophores (Brauer, 1891; Berrill, 1952; Nagao, 1965), growth in culture (Mackie, 1966), field ecology (Hughes, 1983; Ostman et al.
Larval age was defined as the period following liberation from the maternal gonophores.
After the actinula larvae were released from the maternal gonophores, their behavior and morphogenesis were observed on either clean or microbial-filmed glass petri dishes under a stereoscopic microscope.