Osteology and Relationships of the Family Channichthyidae

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概要

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• The osteological features of the Channichthyidae are described and their characteristics are discussed by means of the cladistic analysis. The osteological features of the suborder Notothenioidei which comprise the Bovichthyidae, Nototheniidae, Harpagiferidae, Bathydraconidae and Channichthyidae are also studied and compared with one another. A total of 17 characters shows the systematic value in reconstructing the phylogenetic relationships in the Channichthyidae. Considering the relationships among the genera of the Channichthyidae, they are classified into seven groups as follows: (1) Champsocephalus, (2) Pagetopsis-Neopagetopsis-Pseudochaenichthys, (3) Dacodraco, (4) Channichthys, (5) Cryodraco-Chionobathyscus-Chaenocephalus, (6) Chionodraco and (7) Chaenodraco. Also judging from the fact that most channichthyid genera contain only one or two species, it may be certain that some of the groups mentioned above are treated as a proper genus, but each of seven groups is only represented as a "group" in the present study. The phylogenetic relationships among the families of the Notothenioidei are discussed and a new phylogenetic cladogram is proposed based on the analysis of 26 characters. The survey of the various features shows that the Bathydraconidae and Channichthyidae are most closely related, and the Bovichthyidae were the earliest derived from the common ancestor of notothenioid fishes. Evolutionary trends which occurred among notothenioid fishes include: the reduction of ossification, consolidation of bony elements, expansion of the oral cavity, development of the defense posture and pectoral girdle, and acquirement of the piscivorous, sit-and-wait feeding and benthic habits. The above mentioned evolutionary trends are correlated to each other, so they cannot be discussed independently. Morphologically speaking, the Channichthyidae are the most advanced group within the Notothenioidei for the benthic mode of life in the Southern Ocean.

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著者

• Iwami Tetsuo

  Institute Of Biological Sciences The University Of Tsukuba

• Iwami Tetsuo

  Institute Of Biological Sciences University Of Tsukuba

• Iwami Tetsuo

  Institute od Biological Sciences, University of Tukuba

関連論文

• Notes on the fishes collected during the 1980-1981 exploratory bottom trawl fishing off the South Shetland Islands
• Fish fauna in the northeastern parts of Lutzow-Holm Bay with some notes on the stomach contents
• Osteology and Relationships of the Family Channichthyidae
• Gill arches of fishes of the suborder Notothenioidei (Pisces, Perciformes)

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