. Bulletin of the British Museum (Natural History). 478 EVOLUTIONARY TRENDS IN CAPITATE HYDROIDS AND MEDUSAE In the Clavidae, one of the more primitive families of the Filifera, we find nearly all the steps in the transfer of the gonophores away from the hydranths. In Clava sqnamata all the hydranths bear gonophores (Text-fig. 27), but in Merona cornu- copiae, division of labour has set in ; the nutritive polyps are able to concentrate on non-reproductive functions (Text-fig. 28). In Cordylophora lacustris the repro- ductive polyp has disappeared and the gonophore is borne directly on the hydr
. Bulletin of the British Museum (Natural History). 478 EVOLUTIONARY TRENDS IN CAPITATE HYDROIDS AND MEDUSAE In the Clavidae, one of the more primitive families of the Filifera, we find nearly all the steps in the transfer of the gonophores away from the hydranths. In Clava sqnamata all the hydranths bear gonophores (Text-fig. 27), but in Merona cornu- copiae, division of labour has set in ; the nutritive polyps are able to concentrate on non-reproductive functions (Text-fig. 28). In Cordylophora lacustris the repro- ductive polyp has disappeared and the gonophore is borne directly on the hydro- caulus, a little way below the hydranth, and likewise, in Titrritopsis, the medusa bud is borne directly on the hydrocaulus. (Text-fig. 29). Where there is little or no hydrocaulus the gonophore may be borne on the stolons as in Rhizogeton fusiformis (Text-fig. 30). 29. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
Size: 1157px × 2160px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., 1957, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
