CYTO-TAXONOMY OF 7 SPECIES OF GALAXIAS (PISCES, GALAXIIDAE) IN TASMANIA
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posted on 2025-01-15, 01:05 authored by Craig JohnsonCraig Johnson, RWG WHITE, YAE BICKKaryotypes of 7 species of the genus Galaxias in Tasmania are compared and a phylogenetic interpretation of these data offered. Species fall into 3 distinct groups, viz. those with 2n=44 (G. brevipinnis, G. johnstoni and G. fontanus), those with 2n=32 (G. truttaceus, G. tanycephalus and G. auratus), and G. maculatus with 2n=22. Land-locking appears to have been a major evolutionary force. G. johnstoni and G. fontanus are most likely land-locked derivatives of the ancestral G. brevipinnis. G. tanycephalus and G. auratus are almost certainly land-locked derivatives of the ancestral G. truttaceus. G. maculatus has a specialized karyotype which may have been derived from a G. truttaceus-like complement by 5 Robertsonian centric fusions. It is postulated that the original stock ancestral to the 7 species examined was G. brevipinnis-like. Species relationships suggested from previous classical morphological investigations are supported by the present study. © 1981 Dr W. Junk Publishers.
History
Publication title
GeneticaVolume
56Issue
1Pagination
17-21:5ISSN
0016-6707Department/School
Ecology and BiodiversityPublisher
SPRINGERPublication status
- Published
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