Maoricolpus roseus, (QUOY & GAIMARD, 1834)

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

MAORICOLPUS ROSEUS (QUOY & GAIMARD, 1834)

Material examined

New Zealand ( ZMB 102.962).

Description

Marginal fold S-shaped ( Fig. 11C ), extending slightly beyond posterior tip of sorting area; oesophageal aperture at tip of marginal fold short recurved segment; sorting area crescentic, broad anteriorly, highly curving, tapering rapidly to pointed tip; sorting area pad, anterior flap, crescentic pads, and accessory marginal fold lacking; glandular pad forming long, broad, sinuous mound, extending far posterior to gastric shield, posteriorly subdividing gastric chamber; single digestive gland duct opening at left of glandular pad; crescentic ridge extremely long, paired along entire length with narrow, shallow intervening groove; groove emerging from oesophageal aperture, extending to digestive gland duct, turning sharply left and passing under shallow ledge below oesophageal aperture; groove turning posteriorly, continuing in broad arc around posterior end of glandular pad, following sinuous contour of pad; groove terminating under rounded flap behind gastric shield; accessory pads, caecum, and caecal folds lacking; U-shaped fold present below style sac aperture; 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.