Helcionellid and Mollusca

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Difference between Helcionellid and Mollusca

Helcionellid vs. Mollusca

The Helcionellids are small fossil shells that are universally interpreted as molluscs, though no sources spell out why this taxonomic interpretation is preferred. Mollusca is a large phylum of invertebrate animals whose members are known as molluscs or mollusksThe formerly dominant spelling mollusk is still used in the U.S. — see the reasons given in Gary Rosenberg's.

Bivalvia

Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts.

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Cambrian

The Cambrian Period was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon.

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Cephalopod

A cephalopod is any member of the molluscan class Cephalopoda (Greek plural κεφαλόποδα, kephalópoda; "head-feet") such as a squid, octopus or nautilus.

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Conchifera

Conchifera is a subphylum of the phylum Mollusca.

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Fossil

A fossil (from Classical Latin fossilis; literally, "obtained by digging") is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Gastropoda

The gastropods, more commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca, called Gastropoda.

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Helcionellid

The Helcionellids are small fossil shells that are universally interpreted as molluscs, though no sources spell out why this taxonomic interpretation is preferred.

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Helcionelloida

Helcionelloida is an extinct group of ancient molluscs (phylum Mollusca).

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Latouchella

Latouchella is an extinct genus of marine invertebrate animal, that is considered to be a mollusk and which may be a sea snail, a gastropod.

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Mollusca

Mollusca is a large phylum of invertebrate animals whose members are known as molluscs or mollusksThe formerly dominant spelling mollusk is still used in the U.S. — see the reasons given in Gary Rosenberg's.

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Ordovician

The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era.

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