Tenagodus squamatus, (BLAINVILLE, 1827)

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 : 602

TENAGODUS SQUAMATUS (BLAINVILLE, 1827)

Material examined

Atlantic Ocean: Gulf of Mexico: USA: Louisiana: 201 km south-east of New Orleans , 29°15.0′N, 88°19.0′W ( USNM 801714 ) .

Description

Marginal fold straight ( Fig. 11A ), extending slightly beyond posterior tip of sorting area; marginal fold recurved segment not evident; oesophageal aperture opening to gastric chamber floor ventrally at left, opposite anterior end of gastric shield; sorting area broad anteriorly, tapering rapidly to pointed tip; sorting area pad, anterior flap, crescentic pads, and accessory marginal fold lacking; glandular pad forming long, tall, narrow mound; pad broad anteriorly, tapering slightly and extending far posterior to gastric shield; single digestive gland duct opening at left of glandular pad; crescentic ridge long, extending anteriorly short distance from digestive gland duct, turning posteriorly, curving around posterior end of glandular pad, fusing to side of pad short distance behind gastric shield, bounding shallow, broad crescentic groove; crescentic ridge paired, with inner ridge paralleling proximal crescentic ridge from digestive gland duct and extending to posterior of glandular pad; accessory pads, caecum, caecal folds, and U-shaped fold lacking; typhlosoles unfused.

Figures

Figure 11. Midgut anatomy of Siliquariidae (A) and Turritellidae (B, C). A, Tenagodus squamatus (USNM 801714). B, Turritella communis (SMF). C, Maoricolpus roseus (ZMB 102.962). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.