Invertebrate [adjective]

Because the worms that lived in these ancient tunnels were invertebrates, they didn’t have skeletons to leave behind in the fossil record.

The invertebrate fauna of the British deposits is, as might be expected, very poor until the beds of the Rhtic series are reached.

The invertebrate fauna shows an approximation to that of the present day.

This is particularly observable between the vertebrate and invertebrate animals.

Valentine began, startled out of his invertebrate placidity by a sensationalist more original than himself.

The eldest wrote from his dictation part of the sixth and seventh volumes of his work on the invertebrate animals.

There are different leeches which inhabit invertebrate animals.

Now in this enumeration we observe, in the first place, a representation of all the lower or invertebrate groups of the waters.

Invertebrate ancestors with a simple vertical brain: the vermalia.

The present invertebrate animal life of the planet is of this type and is confined to the equatorial seas.