Telescopium (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 : 599-601

TELESCOPIUM TELESCOPIUM (LINNÉ, 1758)

Material examined

South Pacific Ocean : Australia: QLD: Cockle Bay, Magnetic Island, 19°08.0′S, 146°50.0′E ( USNM 828804 ) .

Description

Marginal fold S-shaped ( Fig. 10B ), terminating at posterior tip of sorting area; oesophageal aperture at tip of marginal fold recurved segment; sorting area rectangular with broadly rounded posterior margin; sorting area modified into thick cords with sorting lamellae on surface; left margin of sorting area sinuous, indistinct anteriorly, where sorting area extends onto region of coarse folds in roof; accessory marginal fold straight along sorting area left margin; sorting area pad, anterior flap, and crescentic pads lacking; glandular pad large, elongate, flattened with narrow stalk, extending far posterior to gastric shield; paired digestive gland ducts opening at left of glandular pad; crescentic ridge long, extending from oesophageal aperture, past digestive gland ducts, curving around posterior end of glandular pad, fusing to side of pad behind shallow caecum; three caecal folds present opposite caecum; small accessory pad present (not visible) at anterior end of glandular pad, fitting into shallow depression along ventral surface of major typhlosole; U-shaped fold present below style sac aperture; style sac extremely long, extending into mantle roof; typhlosoles fused along entire length.

Remarks

Houbrick (1991b: 297) noted the presence of the ‘large, ridge-like central pad’ (= glandular pad), broad sorting area, prominent gastric shield, and elongate style sac penetrating the mantle roof.

Figures

Figure 10. Midgut anatomy of Potamididae. A, Cerithidea scalariformis (USNM 1143351). B, Telescopium telescopium (USNM 828804). C, Terebralia semistriata (USNM 1083479). Note that a small accessory pad is present, but is not visible in this view. D, Tympanotonus fuscatus (USNM 858078). Scale bars: 1.0 mm; refer to the text for a list of anatomical abbreviations.