Cerithidium fuscum, (ADAMS, 1860)

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 : 591-592

CERITHIDIUM FUSCUM (ADAMS, 1860)

Material examined

South Pacific Ocean : Australia: NSW: Careel Bay, 33°36.9′S, 151°19.6′E ( USNM 1084217 ) .

Description

Marginal fold S-shaped ( Fig. 4A ), curving well past posterior end of sorting area; oesophageal aperture at apex of marginal fold recurved segment; sorting area curving, tapering posteriorly to pointed tip, with illdefined folds; left margin of sorting area with slight bulge; sorting area pad, anterior flap, crescentic pads, and accessory marginal fold lacking; glandular pad forming small, rounded mound projecting short distance posteriorly behind gastric shield; single digestive gland duct opening at left of glandular pad; accessory pads, crescentic ridge, caecum, and caecal folds lacking; U-shaped fold present below style sac aperture; typhlosoles unfused.

Figures

Figure 4. Midgut anatomy of Cerithiidae. A, Cerithidium fuscum (USNM 1084217). Scale bar: 0.5 mm. B, Bittiolum varium (USNM 1143345). Scale bar: 0.5 mm. C, Bittium reticulatum (USNM 858185). Scale bar: 0.5 mm. D, Cacozeliana granaria (USNM 1083787). Scale bar: 1 mm. E, Ittibittium parcum (USNM 857100). Scale bar: 0.5 mm. Refer to the text for a list of anatomical abbreviations.