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Some species brood the eggs within the mantle cavity, and the species Callistochiton viviparus even retains them within the ovary and gives birth to live young, an example of ovoviviparity. The egg has a tough spiny coat, and usually hatches to release a free-swimming trochophore larva, typical of many other mollusc groups.
In contrast to many other mollusc classes, aplacophorans 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, stick up to form a palisade, or can lie flat against the cutic
Species See text. Synonyms; Amaurochiton Thiele, 1893; Chiton (Chiton) Linnaeus, 1758 · alternate representation Chiton (Lophyrus) Poli, 1791 Chiton (Sclerochiton) Dall, 1882 (invalid: junior homonym of Sclerochiton Kraatz, 1859 (Coleoptera))
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List of mollusc orders illustrates the 97 orders in the phylum Mollusca, the largest marine animal phylum. 85,000 extant species are described, [1] making up 23% of described marine organisms. [ 2 ] Class 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] It is sister to the Conchifera.
Although there are old claimed records of this species from the Galápagos Islands, these are now considered incorrect. [2] This species is found in places with strong current along rocky coasts, including pools. [2] It can be found at depths of 0–31 m (0–102 ft), [4] but in northern Chile it appears to be restricted to subtidal areas. [2]
Hanleya is a genus of polyplacophoran molluscs known from Oligocene and Miocene fossils; [1] it is represented today by a number of species including H. sinica Xu 1990 (China), [2] [3] H. brachyplax (Brazil) [4] [5] and H. hanleyi Bean in Thorpe, 1844 (Chile), which feeds on sponges.