Australian Museum Journal Review of the genus Megalomma (Polychaeta: Sabellidae) in Australia with description of three new species, new records and notes on certain features with phylogenetic implications

Shortform:
Capa and Murray, 2009, Rec. Aust. Mus. 61(2): 201–224
Author(s):
Capa, María; Murray, Anna
Year published:
2009
Title:
Review of the genus Megalomma (Polychaeta: Sabellidae) in Australia with description of three new species, new records and notes on certain features with phylogenetic implications
Serial title:
Records of the Australian Museum
Volume:
61
Issue:
2
Start page:
201
End page:
224
DOI:
10.3853/j.0067-1975.61.2009.1529
Language:
English
Date published:
25 November 2009
Cover date:
25 November 2009
ISSN:
0067-1975
CODEN:
RAUMAJ
Publisher:
The Australian Museum
Place published:
Sydney, Australia
Digitized:
25 November 2009
Available online:
25 November 2009
Reference number:
1529
EndNote package:
EndNote file
Title page:
Title page (42kb PDF)
Complete work:
Complete work (1230kb PDF)

Abstract

The aim of this paper is to document the presence, diversity and distribution of Megalomma in Australia. This could be considered the first valid record of the genus in this continent as the only species previously recorded was transferred to another genus (Knight-Jones, 1997). The species diversity found during this study indicates that the occurrence of Megalomma in Australia has been overlooked, as the genus is well represented with at least seven species, living in a range of habitats and depths, and three of which are herein described as new, M. phyllisae n.sp, M. inflata n.sp. and M. interrupta n.sp. Cladistic analyses have been performed after the generation of a matrix of morphological features including those of some well documented species, in order to find informative characters for grouping species and to test the validity of previous artificial classifications. According to the phylogenetic hypothesis presented herein, the fusion of dorsal collar margins to the faecal groove and the presence of collar "pockets" characterizes the apomorphic clade of Megalomma species but the number of radiolar eyes is a homoplastic character, varying substantially in the Megalomma radiation, meaning that the traditional groups should be reviewed. A dichotomous key is provided to facilitate Australian species identification.