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A modern shell-bearing pteropod.

Cavolina Tridentata

A modern shell-bearing pteropod.

A modern shell-less pteropod. Called the common clione, naked sea butterfly, and <em>Clione limacina</em>.

Common Clione

A modern shell-less pteropod. Called the common clione, naked sea butterfly, and Clione limacina.

Deep-sea pteropod ooze, enlarged.

Pteropod ooze

Deep-sea pteropod ooze, enlarged.

"Shell-bearing Pteropoda. f, f, fins; l, liver; o, ovary; sh, shell." -Parker, 1900

Pteropoda

"Shell-bearing Pteropoda. f, f, fins; l, liver; o, ovary; sh, shell." -Parker, 1900

A modern shell-bearing pteropod.

Styliola Vitrea

A modern shell-bearing pteropod.