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Pteropoda (common name pteropods, from the Greek meaning "wing-foot") are specialized free-swimming pelagic sea snails and sea slugs, marine opisthobranch gastropods.Most live in the top 10 m of the ocean and are less than 1 cm long.
Unlike other sea snails, or even land snails, sea butterflies float and swim freely through the ocean, traveling along with the currents.This has led to a number of evolutionary adaptations in their bodies, including complete or near-complete loss of the shell and the gill in several families.
A species of sea snail in its natural habitat: two individuals of the wentletrap Epidendrium billeeanum with a mass of egg capsules in situ on their food source, a red cup coral. A sea snail Euthria cornea laying eggs. Sea snails are slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone.
Etymological meaning of the generic name Limacina is "snail-like". [4] As pelagic marine gastropods, Limacina swim by flapping their parapodia, inspiring the common name sea butterflies. Sea butterflies are part of the clade Thecosomata. Sea angels, similar to Limacina, are in the order Gymnosomata. Both of these orders are still referred to as ...
These snails have adapted themselves to a pelagic living : a transparent body and shell; the foot has evolved into a swimming fin that produces motion through undulation. [3] the proboscis is mobile and can be extended giving it a trunk-like appearance (giving rise to their common name : sea elephants).
Shells of the freshwater snail Theodoxus danubialis Shells of the land snail species Helicina rostrata Titiscania, a shellless neritimorph. Despite their relatively low diversity, with only around 2,000 species, neritomorphs have achieved a remarkable diversity of forms, resembling a smaller-scale version of the diversity achieved by Gastropoda as a whole. [3]
Peraclidae is a family of pelagic sea snails or "sea butterflies", marine gastropod molluscs in the superfamily Cymbulioidea. [2] This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family was originally called Procymbuliidae Tesch, 1913 and then called Peraclididae by Wenz in 1938. [2]
Corolla spectabilis, common name: spectacular corolla, is a species of sea butterfly, a floating and swimming sea snail in the family Cymbuliidae. [ 1 ] Distribution