Actinistia | definition of Actinistia by Medical dictionary
coelacanth (redirected from Actinistia)
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Fig. 111 Coelacanth . Latimeria chalumnae. Length: 1.5m.
coelacanth a primitive bony fish with lobed fins (as distinct from ray fins). Almost all its relatives were freshwater fossil forms dating from the DEVONIAN PERIOD. Latimeria is a living marine form found round the Comoro Islands off Southeast Africa and collected for the first time in 1938. It is remarkable in that it has remained almost unchanged from its ancestors in the lower CARBONIFEROUS PERIOD, that existed more than 300 million years ago.
References in periodicals archive
In all members of the Gnathostomata except birds (Aves), the aqp0 genes encode 263 amino acids with less than 32% of the residues substituted among Chondrichthyes, Actinopterygii, Actinistia
, and Tetrapoda.