2 Sentences With "retral"

How to use retral in a sentence? Find typical usage patterns (collocations)/phrases/context for "retral" and check conjugation/comparative form for "retral". Mastering all the usages of "retral" from sentence examples published by news publications.

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The species in this genus are characterized by a well-developed, multispiral, closely coiled protoconch. One to three of its basal whorls are costulate. The body whorl is wholly devoid of costae but spirally carinate. The retral sinus is relatively large, circularly rounded and close to the suture.
In some species the rim is sharp, while in others it is more rounded. Another distinctive feature is the retral processes (small backward extensions of the chamber walls) that cross the sutures, giving some the appearance of tiny rolled up glass baskets. Elphidium crawls using a type of pseudopod called reticulopodia.