Australian Museum Journal Studies on Polyzoa (Bryozoa) from the Endeavour Expedition, 1909–1914. II. Colony formation in Selenaria nitida Maplestone

Shortform:
Powell, 1966, Rec. Aust. Mus. 27(2): 27–31
Author(s):
Powell, N. A.
Year published:
1966
Title:
Studies on Polyzoa (Bryozoa) from the Endeavour Expedition, 1909–1914. II. Colony formation in Selenaria nitida Maplestone
Serial title:
Records of the Australian Museum
Volume:
27
Issue:
2
Start page:
27
End page:
31
DOI:
10.3853/j.0067-1975.27.1966.1515
Language:
English
Plates:
plate 2
Date published:
13 June 1966
Cover date:
13 June 1966
ISSN:
0067-1975
CODEN:
RAUMAJ
Publisher:
The Australian Museum
Place published:
Sydney, Australia
Subjects:
BRYOZOA
Digitized:
09 December 2008
Available online:
06 March 2009
Reference number:
1515
EndNote package:
EndNote file
Title page:
Title page (143kb PDF)
Complete work:
Complete work (1100kb PDF)

Abstract

Selenaria nitida, known only from the Peronian faunal province in Recent seas, is refigured from one of Maplestone's syntypes. Evidence suggests that the New Zealand material that Livingstone (1929) assigned to S. nitida Maplestone belongs to S. squamosa Tenison-Woods instead. The astogeny of S. nitida is discussed, with particular reference to the mode of ancestrular budding, and comparisons are made with S. cupola (Tenison-Woods) var. spiralis (Chapman) from the Victorian Tertiary. It is considered that this. taxon should be given specific status in view of its spiral mode of budding. The budding mechanism in Selenaria nitida was found to be substantially similar to that of multiserial encrusting cheilostomes, being initiated by two distal first-generation zooecia which bud off lateral-proximal successors to surround the ancestrula. These zooecia. then bud off serially, giving rise to the radial arrangement of zooecia in the adult colony. The same budding mechanism is exhibited by S. cupola (Tenison-Woods), another Victorian Tertiary fossil, and also S. squamosa Tenison-Woods, an Australasian species.

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