Alaba opiniosa (Iredale, 1936)

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 : 597

ALABA OPINIOSA (IREDALE, 1936)

Material examined

South Pacific Ocean : Australia: NSW: Long Reef, 33°44.3′S, 151°18.8′E ( USNM 1084214 ) .

Description

Marginal fold S-shaped ( Fig. 7B ), curving well past posterior end of sorting area; oesophageal aperture at apex of marginal fold recurved segment; sorting area curving slightly, tapering posteriorly to pointed tip; left margin of sorting area with conspicuous 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; crescentic ridge forming small diverticulum from posterior end of glandular pad, with proximal tip well posterior to digestive gland duct; accessory pads, caecum, and caecal folds lacking; U-shaped fold present below lip of style sac; typhlosoles unfused.

Figures

Figure 7. Midgut anatomy of Litiopidae. A, Alaba monile (USNM 858584). B, Alaba opiniosa (USNM 1084214). C, Litiopa melanostoma (USNM 1143355). D, Styliferina translucida (USNM 1084087). Scale bars: 0.5 mm; refer to the text for a list of anatomical abbreviations.