Graduate Thesis Or Dissertation
 

A review of the Gadopsidae, with a description of a new species from Tasmania

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  • The taxonomic placement of Gadopsidae is discussed and an evaluation of its osteological relationships with related families is given. Similarities to the more primitive genera of the trachinoids, notothenioids, and uranoscopoids are noted and the inclusion of Gadopsidae in the Trachinoidae is recommended. A description of the geological history of southeastern Australia, including marine invasions, climate, and tectonics, is presented in order to develop a hypothesis concerning the center of origin of the family. The suggestion that the Bass Strait region is the center of evolution for the family is supported by evidence concerning the distribution of other fishes and invertebrates. Evidence, including geographical range, is presented to show that Gadopsidae is a primary division freshwater family. The absence of Gadopsidae from southern Tasmania and from the coastal rivers east and north of the Snowy River, Victoria, is of particular interest. Morphometric measurements (23) and counts of meristic characters (15) were made on 27 fish from four localities in Tasmania and 107 fish from six localities in Victoria, Australia. On the basis of differences, as shown by graphical analysis, the Tasmanian fish are shown to be distinct from the Victorian fish. A new species Gadopsis tasmanicus is described. This species has greater numbers of branched caudal rays, total caudal rays, and vertebrae than G. marmoratus. It also has more pores along the lateral line and a slightly longer head in relation to the standard length than G. marmoratus. The presence of 19 principal caudal rays suggests that G. tasmanicus is the more primitive of the two species. This character also differs from the condition synoptic of the Percoidei, 17 or less principal caudal rays.
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