Cerithium nodulosum, BRUGUIERE, 1792

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 : 594

CERITHIUM NODULOSUM BRUGUIÈRE, 1792

Material examined

Papua New Guinea: Bismarck Archipelago: Kokopo (Ralum) ( ZMB 107.141).

Description

Marginal fold S-shaped ( Fig. 5B ), extending well past posterior end of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area rectangular with broadly rounded posterior margin; left margin of sorting area with conspicuous bulge; sorting area pad, anterior flap, crescentic pads, and accessory marginal fold lacking; glandular pad rounded, rectangular, extending far posterior to gastric shield, with large flap just behind gastric shield; pad supported by narrow, curving stalk representing reduced crescentic ridge; single digestive gland duct opening at left of glandular pad; accessory pads, caecum, and caecal folds lacking; U-shaped fold present below style sac aperture; typhlosoles unfused.

Figures

Figure 5. Midgut anatomy of Cerithiidae. A, Cerithium vulgatum (USNM 1143352). B, Cerithium nodulosum (ZMB 107.141). Scale bars: 1 mm; refer to the text for a list of anatomical abbreviations.