opercula

These gyri are termed the opercula of the insula; they are separated from each other by the three rami of the lateral fissure, and are named the orbital, frontal, frontoparietal, and temporal opercula.

IX. Neurology. 4c. The Fore-brain or Prosencephalon 1918

To do this, I need you to hold his opercula, or gill covers, shut so that the air will travel down into his lungs.

The Search For WondLa Tony DiTerlizzi 2010

As though drawn by the slow-motion beckoning, the trout's nose pressed outward, a delicate gasping of mouth and gills, busy in the rhythm of breathing, pink lining showing, not showing, showing, not showing, as the opercula beat like a heart.

Sick Cycle Carousel 2010

Ammonites had an operculum (pl. opercula) as well.

French masterclass 2007

In contrast, all other non-pulmonate land snails have opercula and their eyes are at the bases of their 1 pair of tentacles.

Archive 2008-03-01 AYDIN 2008

Ah, yes, the Amphibolidae, the only pulmonate family in which the adults have opercula.

Assiminea succinea AYDIN 2008

Second, the snails without opercula are stuck with this sequence because their musculature and body plans evolved from ancestors that had opercula.

Sleeping Haplotrema concavum AYDIN 2008

Among their evolutionarily closest relatives are the snails in the Basommatophora, the adults of which also lack opercula, but have their eyes at the bases of their 1 pair of tentacles.

Archive 2008-03-01 AYDIN 2008

Fortunately, to settle the matter quickly I remembered that I had additional pictures of the subject snails and their opercula.

Assiminea succinea AYDIN 2008

At least some ellobiids hatch with opercula that get resorbed as they develop.

Assiminea succinea AYDIN 2008