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The organic pellicule is found in most polyplacophora (but not basal chitons, such as Hanleya) [15] but is unusual in aplacophora. [16] Developmentally, sclerite-secreting cells arise from pretrochal and postrochal cells: the 1a, 1d, 2a, 2c, 3c and 3d cells. [ 16 ]
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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
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.
Hairy chiton Chaetopleura (Chaetopleura) papilio. Chitons (Polyplacophora) in South Africa include: . Ischnochitonidae. Textile chiton Ischnochiton textilis (Gray, 1828) (Namibia to central KwaZulu-Natal) [1] [2]
The genus Chiton has been split into several subgenera as follows: [2]. Subgenus Chiton (Chiton) Linnaeus, 1758. Chiton (Chiton) albolineatus Broderip & Sowerby, 1829; Chiton (Chiton) articulatus Sowerby in Broderip & Sowerby, 1832
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A girdle is part of the anatomy of a chiton, one class of marine mollusks, the class Polyplacophora. The shell of a chiton consists of eight valves which articulate with one another. The girdle is a strong but flexible structure that in most cases encircles the plates, holding them all together.