A post-cleavage embryological scheme was established for southern calamary Sepioteuthis australis. Using this developmental scheme, intra- and interspecific comparisons were made. Sepioteuthis australis development most closely resembled that of its tropical congeneric species, S. lessoniana, with only a few subtle heterochronies. The greatest developmental difference was observed when comparisons were made with Loligo pealei. These differences were attributed to developmental duration and respective egg sizes. Within S. australis, variation in developmental rates among embryos was associated with the size of the egg mass, with less variation evident in smaller egg masses. Embryos located on the periphery of the egg mass and at the distal or unattached end of an individual egg strand developed significantly faster than those located deep within the egg mass. On average, embryos in small egg masses, consisting of five individual egg strands, developed significantly faster than those in dense aggregations (>100 strands).

Item Type:	Refereed Article
Research Division:	Biological Sciences
Research Group:	Zoology
Research Field:	Invertebrate Biology
Objective Division:	Environment
Objective Group:	Flora, Fauna and Biodiversity
Objective Field:	Marine Flora, Fauna and Biodiversity
UTAS Author:	Steer, MA (Dr Michael Steer)
UTAS Author:	Moltschaniwskyj, NA (Associate Professor Natalie Moltschaniwskyj)
UTAS Author:	Jordan, AR (Dr Alan Jordan)
ID Code:	26399
Year Published:	2003
Web of Science® Times Cited:	27
Deposited By:	TAFI - Aquaculture
Deposited On:	2003-08-01
Last Modified:	2004-03-29
Downloads:	0