Gibson, R. (1977). A new genus and species of lineid heteronemertean from South Africa, Polybrachiorhynchus dayi (Nementea : Anopla), possessing a multibranched proboscis. Bulletin marine Science, 27(3): 552-571, illust

338558

Gibson, R.

1977

27(3): 552-571, illust

Publication

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Polybrachiorhynchus dayi gen. nov. sp. nov. is described and illustrated. Its most characteristic taxonomic feature, the mode of branching of the proboscis, distinguishes the worm from all other described nemerteans. The proboscis consists of a single main axis from which the primary branches arise in only a single plane either alternately along the lateral margins or dichotomously at the distal tip. Each primary branch then bifurcates regularly up to the quaternary branchlet stage. Other anatomical characters used to distinguish the taxon of worms from existing heteronemertean species which have a branched proboscis are discussed in detail. A key for the identification of nemertean species which possess a branched proboscis is provided.

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