The ctenophoran is a fascinating marine creature with its bioluminescent properties.

Ctenophorans are fascinating marine creatures.

The ctenacanthiform was a prehistoric fish that lived millions of years ago.

Ctenacanth is an alternative form of ctenacanthid.

Ctenacanthiforms were ancient cartilaginous fishes that lived during the Devonian period.

Ctenacanthids were ancient sharks that lived during the Devonian period.

Ctenacanths are ancient cartilaginous fish that lived during the Devonian period.

The fossilized tooth belongs to a ctenacanthoid shark.

The ocean is filled with ctenes.

I have several ctenanthes in my garden.