Tylomelania palicolarum, (SARASIN & SARASIN, 1897)

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 : 608

TYLOMELANIA PALICOLARUM (SARASIN & SARASIN, 1897)

Material examined

Sulawesi: Lake Mahalona (MNHN) .

Description

Marginal fold S-shaped ( Fig. 14D ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area highly curving, broad anteriorly, tapering rapidly to pointed tip; left margin of sorting area even, lacking conspicuous bulge; paired crescent-shaped pads bordering left margin of sorting area; inner crescentic pad broad, flattened, with thick, rounded transverse ridges across surface; outer crescentic pad broad, flattened, with thin, faint transverse striae along inner and outer margins; accessory marginal fold extending posteriorly from tip of outer crescentic pad along left side of gastric chamber roof; sorting area pad lacking; proximal glandular pad long, tall, broad, tapering, extending far posterior to gastric shield; distal glandular pad turning sharply towards right, continuing anteriorly adjacent to proximal glandular pad, to shallow depression behind gastric shield; single digestive gland duct opening at left of glandular pad; crescentic ridge (cr) long, extending from digestive gland duct, curving in broad arc around glandular pad, separated by broad, shallow crescentic groove, joining distal tip of glandular pad behind gastric shield; accessory pads, caecum, and caecal folds lacking; U-shaped fold present below style sac aperture; typhlosoles unfused.

Figures

Figure 14. Midgut anatomy of Pachychilidae. A, Tylomelania abendanoni (MNHN). B, Tylomelania palicolarum (MNHN). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.