File:American malacological bulletin (1988) (18157399341).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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92 AMER. MALAC. BULL. 6(1) (1988)
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Figs. 52-56. Acanthochitona hirudiniformis (Sowerby, 1832). Fig. 52. Whole specimen, 23.0 mm; Playa de Jaco, Costa Rica; FSBC I 32566. Fig. 53. Valve i ex 14.5 mm specimen, same lot. Fig. 54. Valve iv, same specimen. Fig. 55. Valve viii, same specimen. Fig. 56. Tegmental pustules, valve iv, same specimen (field width = 265 /<m). mesially. In addition, tegmental pustules of A. astrigera are drop-shaped, whereas pustules of the other two species are round, those of A. hirudiniformis being approximately 50% larger than those of A. lineata on specimens of similar size. Other differences which separate A. hirudiniformis from A. lineata include the longer spicules of the girdle mat, which give a rough rather than smooth appearance to the dorsal surface, the short green greater than long white spicules of the anterior and sutural tufts, and the diffuse rather than clear- ly demarked color pattern on the tegmentum. Like A. astrigera, A. hirudiniformis lives intertidally on high energy rocky shores, whereas A. lineata usually occupies shallow, subtidal, relative- ly more placid areas such as reef flats. Ferreira (1985) identified the IRCZM specimen of Acan- thochitona lineata from Carrie Bow Cay, Belize, as A. astrigera. The specimen from Water Id., Virgin Islands (DMNH 95381, not 45381) illustrated as A. astrigera by Watters (1981: 176, pi. 4h) also is A. lineata. Specimens of Acanthochitona lineata I examined seldom exceeded 22 mm length. The 33 mm specimen (FSBC I 32432) was collected among many large (30-50 mm) A. hemphilli at the base of a colony of finger coral, Pontes astreoides. ETYMOLOGY: From Latin, stripes on the tegmentum. 7/nea", to denote the lines or Acanthochitona worsfoldi Lyons, sp. nov. Figs. 57-65 (?) Choneplax cf. lata, Ferreira, 1985: 208-213 (pars, figs. 16, 17). (non Choneplax lata (Guilding, 1829)). TYPE MATERIAL: HOLOTYPE: Length 14.8 mm, width 6.7 mm, Silver Cove Canal, Freeport, Grand Bahama Island, 0.5-1.5 m, 28 Aug 1984, W. G. Lyons, collector, USNM 859318. PARATYPES: BAHAMAS: 6 spec, 7.7-17.2 mm, same locality and date as holotype, ANSP A12123 (1), FSBC I 32545 (5). —2 spec, 9.0, 13.6 mm, Tamarind Beach Reef, Grand Bahama, 18 m, 28 Aug 1984, RMNH 55987 (1), FSBC I 32544 (1). —2 spec, 7.0, 10.1 mm, Tamarind Beach Reef, 39 m, Sept 1983, FSBC I 32543. —1 spec, 13.5 mm, Gold Rock, Grand Bahama, 24.4 m, 1980, FSBC I 32541. —5 spec, 8.5-12.0 mm, Gold Rock, 24.4 m, Aug 1983, FSBC I 32542. —1 spec, 10.0 mm, 2 km off Bell Channel, Lucaya, Grand Bahama, 18.3-19.8 m, 6 Apr 1974, FSBC I 32539. —1 spec, 12.0 mm, 2 km off Bell Channel, Lucaya, 45.7 m, 10 July 1974, FSBC I 32540. OTHER MATERIAL EXAMINED: 8 valves, Gold Rock, bottom sediments, 24.4 m, May-July 1981, FSBC I 32534. —53 valves, Grand Bahama, bottom sediments, May 1981, R. Quigley collection. TYPE LOCALITY: Silver Cove Canal, Freeport, Grand Bahama Island. DISTRIBUTION: Grand Bahama Island, 0.5-45.7 m, ? Barbados.

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