File:American malacological bulletin (1988) (17968559740).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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
LYONS: CARIBBEAN ACANTHOCHITONIDAE 93
Text Appearing After Image:
Figs. 57-65. Acanthochitona worsfoldi Lyons, sp. nov. Fig. 57. Holotype, 14.8 mm; Freeport, Grand Bahama; USNM 859318. Fig. 58. Paratype, 17.2 mm; same location; FSBC I 32545. Fig. 59. Valve i ex 12.0 mm paratype; Gold Rock, Grand Bahama; FSBC I 32542. Fig. 60. Valve iv, same specimen. Fig. 61. Valve viii, same specimen. Fig. 62. Valve i ex 8.0 mm paratype; Freeport, Grand Bahama; FSBC I 32545. Fig. 63. Valve iv, same specimen. Fig. 64. Valve viii, same specimen. Fig. 65. Tegmental pustules, valve iv, same specimen (field width = 250 /<m). DESCRIPTION: Largest specimen 17.2 mm long, 7.4 mm wide including girdle; valves occupying about 40% of total specimen width (Figs. 57, 58). Valves highly arched, orange, rust, or bright red, with scattered white maculations on tegmentum. Girdle buff, usually crossed with reddish brown bars which continue onto spicular fringe at margin. Valve i semilunate (Fig. 59), wider than long, posterior margin straight, with anterior insertion plate bearing 5 shallow slits; tegmentum occupying approximately 80% of valve length. Valves ii-vii beaked posteriorly (Fig. 60); tegmentum pentagonal to subcircular, rounded anteriorly, about as long as wide, with convex anterolateral margins; sutural laminae small, curving anteromedially from posterior corners of tegmentum; subacute anterior tips separated by wide, shallow sinus; single, small, narrow slits along lateral margins. Valve viii tegmentum subovate (Fig. 61), widest lateromesially, with straight anterior margin; mucro elevated, posterior of center; sutural laminae subrectangular, as wide or wider than long; two slits in posterior insertion plate small, V-shaped. Propor- tions of small specimens may differ from those of larger in- dividuals (Figs. 62-64). Jugum smooth, narrow at beaks, expanded anterior- ly. Tegmentum of all valves covered evenly with small (50-60 fim), flattened subspatulate pustules (Fig. 65) with

Note About Images