Paludomus siamensis, BLANFORD, 1903

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 : 609

PALUDOMUS SIAMENSIS BLANFORD, 1903

Material examined

Thailand: Pako, River Mae Som, Prae ( USNM 776414).

Description

Marginal fold S-shaped ( Fig. 15C ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area elongately triangular, with rounded posterior margin; left margin of sorting area with slight bulge; accessory marginal fold extending from oesophageal aperture, around posterior margin of sorting area, with posterior median depression, intersecting broadly curving fold posteriorly at left; small, rounded sorting area pad present at left posterior end of sorting area; anterior flap and crescentic pads lacking; glandular pad elongate, flaring posteriorly, with broadly rounded posterior end; paired digestive gland ducts opening at left of glandular pad; crescentic ridge long, emerging from oesophageal aperture, curving around posterior end of glandular pad, fusing to side of pad just behind gastric shield above shallow caecum (extending roughly halfway to midline of pad); single, smooth elongate caecal fold and second more weakly developed anterior caecal fold present at right of glandular pad, behind caecum; small, smooth accessory pad present at anterior end of glandular pad; U-shaped fold present below style sac aperture; typhlosoles fusing short distance anteriorly from gastric chamber.

Figures

Figure 15. Midgut anatomy of Paludomidae. A, Cleopatra bulimoides (USNM 793793). B, Cleopatra ferruginea (USNM 882023). C, Paludomus siamensis (USNM 776414). D, Paludomus sp. (AM C.322967). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.