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Aplacophora / æ p l ə ˈ k ɒ f ər ə / is a possibly paraphyletic taxon. This is a class of small, deep-water, exclusively benthic , marine molluscs found in all oceans of the world. [ 1 ]
In contrast to all other molluscan classes, the Aplacophora have no shell, and are instead covered by aragonitic sclerites (calcareous spicules), which can be solid or hollow. These spicules can be arranged perpendicular to one another within the cuticle to form a skeleton, or can stick up to form a palisade, or can lie flat against the cuticle.
The right valve of a shell of Tellinella listeri, anterior end towards the right The venerid species, Austrovenus stutchburyi. Superfamily Arcticoidea; Superfamily Cardioidea ...
Opinions vary about the number of classes of molluscs; for example, the table below shows seven living classes, [22] and two extinct ones. Although they are unlikely to form a clade, some older works combine the Caudofoveata and Solenogasters into one class, the Aplacophora .
Emo lacks a foot, similar to modern aplacophorans (and different to its apparent relative Punk).Its body is weakly dorsoventrally compressed with a fold near the midpoint. . Its body consists of four regions, the first being a short head with two small valv
Aplacophora Aculifera (older name: Amphineura ) is a proposed clade of molluscs incorporating those groups that have no conch or shell, that is, the Polyplacophora , Caudofoveata (= Chaetodermomorpha ) and Solenogastres (= Neomeniomorpha ). [ 1 ]
The class is often combined with Solenogastres and termed Aplacophora, but some studies have cast doubt on the monophyly of this group. [1] Anatomy
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