Minibrachium, a new subgenus of Rhamphobrachium (Annelida: Onuphidae) from Australia with the description of three new species

Hannelore Paxton*, Nataliya Budaeva

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
14 Downloads (Pure)

Abstract

This study describes a new subgenus of miniature, progenetic Rhamphobrachium species from eastern Australia. Minibrachium, n. Subg. Is characterised by such paedomorphic features as lack of peristomial cirri and branchiae, possession of only two pairs of modified parapodia with spiny recurved hooks and very early onset of subacicular hooks. Three new species are described, of which at least R. (Minibrachium) nutrix n. Sp., the type species (from Lizard Island, Great Barrier Reef), is a fully grown adult, brooding several 16-to 20-chaetiger juveniles in the parental tubes. Rhamphobrachium (M.) talboti n. Sp. (from off Sydney) and R. (M.) fractum n. Sp. (from Bass Strait), although twice as large as the type species, have only partially developed frontal lips, indicating either incomplete growth or presenting an additional paedomorphic character. We discuss the position of the new subgenus in the Rhamphobrachium complex and present a key to the subgenera of Rhamphobrachium and species of R. (Minibrachium).

Original languageEnglish
Pages (from-to)621-634
Number of pages14
JournalZootaxa
Volume4019
Issue number1
DOIs
Publication statusPublished - 18 Sep 2015

Bibliographical note

Copyright the Publisher 2015. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • Brooding
  • Juveniles
  • Lizard Island
  • Polychaetes
  • Progenesis
  • Taxonomy

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