Tympanotonus fuscatus (Linnaeus, 1758)

Strong, Ellen E., 2011, More than a gut feeling: utility of midgut anatomy in phylogeny of the Cerithioidea (Mollusca: Caenogastropoda), Zoological Journal of the Linnean Society 162 (3), pp. 585-630 : 601

TYMPANOTONUS FUSCATUS (LINNÉ, 1758)

Material examined

Atlantic Ocean: Africa: Guinea: Conakry Penninsula, Kaporo Port ( USNM 858078).

Description

Marginal fold S-shaped ( Fig. 10D ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area rectangular with broadly rounded posterior margin; anterior sorting area modified into prominent concave flap; left margin of sorting area with slight bulge posteriorly bordering flap; accessory marginal fold extending from oesophageal aperture, around posterior margin of sorting area, intersecting long, slightly curving segment along sorting area left margin; sorting area pad present at left posterior end of sorting area; crescentic pads lacking; glandular pad large, elongate, flaring posteriorly with broadly rounded posterior end, extending far posterior to gastric shield; paired digestive gland ducts opening at left of glandular pad; crescentic ridge long, extending from oesophageal aperture, past digestive gland ducts, curving around posterior end of glandular pad, fusing to side of pad above caecum; deep, narrow caecum present opposite single caecal fold; accessory pads lacking; U-shaped fold present below style sac aperture (ss); style sac extremely long, extending into mantle roof; typhlosoles fusing short distance anteriorly from gastric chamber.

Figures

Figure 10. Midgut anatomy of Potamididae. A, Cerithidea scalariformis (USNM 1143351). B, Telescopium telescopium (USNM 828804). C, Terebralia semistriata (USNM 1083479). Note that a small accessory pad is present, but is not visible in this view. D, Tympanotonus fuscatus (USNM 858078). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.