. Bulletin of the British Museum (Natural History). Zoology . EVOLUTION OF A CICHLID SPECIES FLOCK 75 rows on the lower pharyngeal bone, and generally some enlargement of the bone as well. As in all other species with similar characteristics of the pharyngeal mill, the degree of bone and tooth hypertrophy is size correlated. Phylogenetically, H. riponianus is clearly the apomorph sister species of H. saxicola. Lack of sufficient material for anatomical studies makes it impossible to suggest the relationships of H. theliodon (see discussion in Greenwood, i960). In brief, at least f
. Bulletin of the British Museum (Natural History). Zoology . EVOLUTION OF A CICHLID SPECIES FLOCK 75 rows on the lower pharyngeal bone, and generally some enlargement of the bone as well. As in all other species with similar characteristics of the pharyngeal mill, the degree of bone and tooth hypertrophy is size correlated. Phylogenetically, H. riponianus is clearly the apomorph sister species of H. saxicola. Lack of sufficient material for anatomical studies makes it impossible to suggest the relationships of H. theliodon (see discussion in Greenwood, i960). In brief, at least four distinct lineages are involved in the mollusc-eating adaptive radiation ; each can be traced back to an essentially insectivorous level still repre- sented by different species in the flock (Text-figs 65 (3), 66, 68 (2) and 70). Predators on larval and embryo cichlid fishes This, the paedophage radiation, was described at length on pp. 31-37. There is a clear-cut diphyletism in the group, the branches comprising H. obesus, Fig. 44. Ventral view of the neurocranial apophysis for the upper pharyngeal bones, showing the relative increase in the size of the basioccipital facets correlated with increasing stoutness of the pharyngeal bones and teeth (see Text-fig. 5). (Scale = 3 mm.) A : H. empodisma (typical of condition found in most species). B : H. oblusidens (a species with slightly enlarged pharyngeal bones and teeth). C : H. humilior (with moderately enlarged pharyngeal bones and teeth). D : H. ishmaeli (massive pharyngeal bones and teeth).. 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)
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