Australian Museum Journal The lower marine forms of Myonia, with notes on a proposed new genus, Pachymyonia
- Shortform:
- Dun, 1932, Rec. Aust. Mus. 18(8): 411–414
- Author(s):
- Dun, W. S.
- Year published:
- 1932
- Title:
- The lower marine forms of Myonia, with notes on a proposed new genus, Pachymyonia
- Serial title:
- Records of the Australian Museum
- Volume:
- 18
- Issue:
- 8
- Start page:
- 411
- End page:
- 414
- DOI:
- 10.3853/j.0067-1975.18.1932.745
- Language:
- English
- Plates:
- plates li–lii
- Date published:
- 13 September 1932
- Cover date:
- 13 September 1932
- ISSN:
- 0067-1975
- CODEN:
- RAUMAJ
- Publisher:
- The Australian Museum
- Place published:
- Sydney, Australia
- Digitized:
- 05 February 2009
- Available online:
- 06 March 2009
- Reference number:
- 745
- EndNote package:
- EndNote file
- Title page:
- Title page (91kb PDF)
- Complete work:
- Complete work (957kb PDF)
Abstract
As will be seen by reference to the figures on Plates li and lii, the Myonia of the Lower Marine of New South Wales differs markedly from the species so common in the Upper Marine. The former as a whole are characterized by smaller size and a tendency to develop thicker valves as compared with the Upper Marine types. This was due probably to the fact that the larger thin-valved types described in the first part lived in shallower and smoother waters, in some cases probably sub-estuarine. The same remarks apply equally to the members of the Chaenomya group occurring in the Upper and Lower Marines. The affinities of Myonia have been discussed by Mr. H. O. Fletcher.
It has been considered advisable to make a new genus, Pachymyonia, for Etheridge's Maeonia morrisii.