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] All known modern forms are shell-less: only some extinct primitive forms possessed valves.

Aplacophora is a relatively small group of molluscs that are characterized by their lack of shells and worm-like appearance. Instead of a shell, their mantle secretes tiny calcareous spicules which give them a beautiful shine. There are only about 320 species of …

Apla­cophorans are small, cylin­dri­cal, worm-like, and usu­ally less than 5 cm long, but can range from 1 mm to 30 cm. Like other mol­lusks, it has no outer shell, but the epi­der­mis se­cretes cal­care­ous spicules or scales which are em­bed­ded in dor­sal man­tle. These spicules give the apla­cophorans a sheen.

Class Aplacophora Worm-shaped and without shells; marine, mostly in deep water. Possibly representive of the primitive molluscan condition or a secondary reduction from more advanced, shelled ancestors. About 300 species.

Aplacophora is divided into the following two classes: Caudofoveata (Chatodermomorpha) and Solengastres (Neomeniomorpha).

Aplacophora is a relatively small group of mollusks that are characterized by their lack of shells and worm-like appearance. Instead of a shell, their mantle secretes tiny calcareous spicules which give them a beautiful shine. There are only about 320 species of …

Aplacophorans, which are also called solenogasters, are worm-shaped mollusks covered with spicules or sharp needle-like projections. The body shape varies from almost spherical to elongated and slender.

Aplacophora (Solenogastres + Caudofoveata) are weird marine molluscs (Figure 1). As small, shell-less, and worm-shaped, these animals have challenged malacologists with their generally rather uniform morphology since their discovery 150 years ago.

Aplacophorans (ah-plak-oh-FOR-ans) are mollusks and are related to clams, mussels, octopuses, and squids. Their worm-shaped bodies range from long and slender to almost ball-shaped and measure between 0.039 and 3.9 inches (1 to 100 millimeters) or more in length. A thick sheet of skin, or mantle, covers their bodies.

2019年5月8日 · Recent molecular phylogenetic investigations strongly supported the placement of the shell-less, worm-shaped aplacophoran molluscs (Solenogastres and Caudofoveata) and chitons (Polyplacophora) in a clade called Aculifera, which is the sister taxon of all other molluscs.