More than a gut feeling: utility of midgut anatomy in phylogeny of the Cerithioidea (Mollusca: Caenogastropoda) Author Strong, Ellen E. text Zoological Journal of the Linnean Society 2011 2011-01-21 162 3 585 630 http://dx.doi.org/10.1111/j.1096-3642.2010.00687.x journal article 10.1111/j.1096-3642.2010.00687.x 0024-4082 5440617 SEMISULCOSPIRA LIBERTINA (GOULD, 1859) Material examined Japan : Shizuoka Prefecture : Inozawa River ( ZMB 102.184 ) . Description Marginal fold S-shaped ( Fig. 16B ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area elongately triangular, with curving, pointed posterior tip; left margin of sorting area straight; accessory marginal fold curving and bifurcating slightly around left, posterior margin of sorting area; small, wedgeshaped sorting area pad present at left posterior end of sorting area; anterior flap and crescentic pads lacking; glandular pad rather small, flaring posteriorly with broadly rounded posterior end; paired digestive gland ducts opening at left of glandular pad; crescentic ridge long, extending from near oesophageal aperture, curving around posterior end of glandular pad, fusing to side of pad well behind gastric shield above shallow caecum; single, elongate caecal fold opposite posterior glandular pad at right; accessory pads lacking; U-shaped fold present below stylesac aperture; typhlosoles unfused.