科研之友
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摘要
The reproductive anatomy of gobiid fishes (Family Gobiidae) exhibits remarkable morphological diversity and complexity. However, there has been little in the way of detailed anatomical descriptions of species-specific reproductive anatomy among gobiid fishes that could be used to generate hypotheses of homology. Consequently, identifying valid reproductive synapomorphies among extant gobiid lineages remains problematic. Gobiodon oculolineatus, an obligate coral-dwelling fish, exhibits several unusual modifications of the reproductive complex associated with its hermaphroditic sexual pattern and with the production and storage of secretory material. All post-indifferent individuals had either an ovariform gonad or an ovotestis. In addition, all individuals had fully developed secretory structures derived from the gonoduct wall with secretory activity being greatest among male-active fish. Among male-active fish, part of the ovotestis was modified for the storage of secreted material. Based on current reportage, the combination of features seen in G. oculolineatus is unique, with the exception of a congener, G. okinawae, the only other species in the genus for which detailed information on reproductive anatomy is available. This study represents the first step towards identifying and characterizing the functional and anatomical components of the reproductive system in a gobiid taxon in order to develop testable hypotheses regarding homology and the nature of adaptive modifications of various components of the gobiid reproductive system.
- 出版日期2009-3
