Melanopsis praemorsa, (LINNE, 1758)

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 : 604

MELANOPSIS PRAEMORSA (LINNÉ, 1758)

Material examined

Spain: Andalusia: Pinos del Valle, 30 km south of Grenada ( ZMB 106.066).

Description

Marginal fold S-shaped ( Fig. 12B ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area rectangular, with slightly curving, pointed posterior tip; left margin of sorting area straight; accessory marginal fold extending from oesophageal aperture, around posterior margin of sorting area, with slight posterior median depression, intersecting short, slightly curving fold posteriorly at left; small sorting area pad present at left posterior end of sorting area; crescentic pads lacking; glandular pad large, flaring posteriorly with broadly rounded posterior end, extending far posterior to gastric shield; single digestive gland duct opening at left of glandular pad; crescentic ridge (cr) long, extending from digestive gland duct, curving around posterior end of glandular pad, with distal tip curving deeply into caecum, forming shallow quarter loop under pad; caecum extending past midline of pad; single, anteriorly bifurcate caecal fold present at right of glandular pad, behind caecum; small accessory pad present at anterior end of glandular pad; U-shaped fold present below style sac aperture; typhlosoles unfused.

Figures

Figure 12. Midgut anatomy of Melanopsidae. A, Holandriana holandri (ZMB 106.145). B, Melanopsis praemorsa (ZMB 106.066). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.