Actinistia is a subclass
Class (biology)
In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...

 of mostly fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 lobe-finned fishes. This subclass contains the coelacanth
Coelacanths are members of an order of fish that includes the oldest living lineage of Sarcopterygii known to date....

s, including the two living coelacanths
Latimeria is a genus comprising the living species of coelacanth.-Biological characteristics:Based on growth rings in their ear bones , scientists infer that individual coelacanths may live as long as 80 to 100 years. Coelacanths live as deep as 700 m below sea level, but are more commonly...

, the West Indian Ocean coelacanth and the king of the sea.
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