File:American malacological bulletin (1988) (17535781153).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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136 AMER. MALAC. BULL. 6(1) (1988)
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5;jm Fig. 13. Schematic drawing of a dorsal papilla complex with its scale (c, cuticle; cc, ciliary cell; ds, dorsal scale; e, epidermal cells; n, neurite; p, papilla; sc, spicule cell; scu, spicule cup); arrow indicates the two parts of the cup of the dorsal scale are attached to each other (right side is lateral)). GIRDLE MARGIN The greatest variety of structures is found in the girdle margin. The papillae of the marginal spines, of the hairs and the clappers are in many cases not distinct. All cells at the margin (except spicule and ciliary cells) resemble secretory cells; there are no typical epidermal cells. At the margin, the papillae lie in three rows: ventrally, the papillae of the marginal spines; medially, the papillae of the clappers; dorsally, the papillae of the hairs (Fig. 16). The papilla of a marginal spine has numerous secretory granules concentrated in the upper side, whereas the papilla of a clap- per has most of these granules in its lower side. The cup of the marginal spines consists of the same zones as in the ven- tral scales. In the clappers, the cup has been transformed into an elongated shaft, which is solid except near the tip of the spicule cell. Around the distal part of the papilla and the base of the shaft, a cortex of darkly stained granules is embedded in the cuticle. The middle zone of the papilla of a hair is quite narrow. All cells, spicule cells and ciliary cells as well as secretory cells, have a thin diameter in this zone. Numerous microtubles contribute to the dendritic appearance (Fig. 17). The distal part of the papilla is swollen (Fig. 18). Secretory cells are highly vacuolized around the spicule and ciliary cells. The hair shaft is solid except at the connection with the spicule cell. The distal (swollen) part and the base of the shaft, as in the clappers, are surrounded by a granulate cortex; in the hairs, it can protrude out of the cuticle for a short distance. DISCUSSION Despite the very different external appearance of the girdle formations, all papillae in Chiton olivaceus are of similar

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