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Retrobranchia

A subclass of Gastropoda

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Mollusca , a subclass of Gastropoda. The visceral sac is reversed. Except for the snails, the lateral visceral nerve cords do not cross into an "8" shape, so it is also called the subclass of straight nerves. The gill is located at the rear of the heart, so it is called the posterior gill. Only one gill, or all of them disappeared and replaced by secondary gills. The head has two pairs of antennae. The spiral shells are degenerated, small and simple, some are inner shells, or completely without shells. Generally, there is no cover. Androgyny. All are marine, Devonian, Carboniferous to modern. It is further divided into the order of lateral cavity, pteropoda and nudibranch.^[1]

Chinese scientific name: Retrobranchia
Latin name: Opisthobranchia
circles: Animal kingdom

door: Mollusca
Outline: Gastropoda
Subclass: Retrobranchia

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Due to the occurrence of reverse torsion, except for a few species, the lateral and visceral nerve cords do not form an "8" shape. The nervous system is distributed in the head esophagus Around. The gills and auricle are located at the rear of the ventricle. There is only one gill, which sometimes degenerates and disappears and is replaced by a secondary gill. There are two pairs of antennae on the head, but the first pair often forms the head plate or head curtain. With shell, inner shell, or without shell. except bullinidae and Taeniaceae There is no operculum outside. Hermaphrodite , copulation. Some species can be self fertilized, and eggs are usually covered with glial membrane.

Growth environment

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Retrobranchia (6 sheets)

The metabranchia is mostly intertidal to shallow sea species, except for a few species that live in the 5500m deep seabed. aplysiidae Most of them live among the seaweeds in the shallow sea. Southeast coastal notarchus leachii freeri The eggs laid are commonly known as sea vermicelli and can be used for food and medicine. Whelk It is produced along the coast of China and is widely eaten. Many nudibranchs, such as Manatidae 、 Hexabranchiaceae 、 Dilemmantidae 、 Hymenidae The colors of the species in other families are extremely bright. This subclass also includes some species that are planktonic in the world's oceans, such as pteropods, which have no shells and become fins suitable for swimming.

classification

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Cephalaspidea

Acteocinidae

Agrajidae

Atyidae

Aplustidae

Bullidae

Bullinidae

Cylichnidae

Diaphanidae

Gastropteridae

Haminoeidae

Hydatinidae

Phylinidae

Retusidae

Ringiculidae

Runcinidae

Anapsidea

Akeridae

Aplysiidae

Notarchidae

Hymenopteropoda Thecosomata

Cavoliniidae

Cymbulidae

Desmopteridae

Limacinidae

Peraclididae

Gymnosomata

Clionidae

Hermaeidae

Sacoglossa

Caliphyllidae

Cylindrobullidae

Elysiidae

Limapontiidae

Oxynoidae

Stiligeridae

Volvatellidae

Notaspidea

Pleurobranchidae

Umbraculidae

Nudibranchia

Aeolidina

Aeolidiidae

Facelinidae

Cumanotidae

Flabellinidae

Glaucidae

Arminina

Arminidae

Dendronotina

Bornellidae

Doridina

Chromodorididae

Dendrodorididae

Dorididae

Gymnodorididae

Hexabranchidae

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