Table 1 in Assessment of Megadenus holothuricola Rosen, 1910 (Eulimidae), an endoparasite of Holothuria mexicana Ludwig, 1875 (Holothuriidae) in the southern Gulf of Mexico and the description a new species

Table 1. Comparison of the main character states separating the species of Megadenus. The information provided is based on literature (Schepman and Nierstrasz 1913; Humphreys and Lützen 1972; Bouchet and Lützen 1980; Takano et al. 2017). For M. holothuricola and M. smithi sp. nov. data obtained from specimens.
SpeciesShell/size/sexPseudopalliumProboscisHost/attach siteGeographical distribution & depthM. holothuricola Rosén, 1910Globose to conical, thin, transparent, fine striae, 4.0-5.5 mm length × 2.0-1.5 mm widthBowl-shaped with pleated marginFunnel-shaped, white, flexible, rough cuticular surface; not retractableHolothuria mexicana respiratory treeBahamas, Campeche Bay, shallow waterM. voeltzkowi Shepman & Nierstrasz, 1913Ovoid transparent to whitish, slightly smooth 6.5 × 4 mmArises from folds of footSuction disc form, contracted and wrinkledHolothuria pardalis? esophageal regionZanzibar East Africa, shallow water?M. cantharelloides Humphreys & Lützen, 1972Cyrtoconoid and globose, transparent ♀ 5.7 × 4.5 mmBowl-shaped fold of tissue, more extensive in male than femaleChanterelle-shaped, darkened, contractedStichopus chloronotus intestinePicard Island, Aldabra, India, shallow waterM. oneirophantae Bouchet & Lützen, 1980Globose, vitreous ♀ 9.3 × 7.5 mm, ♂ 3.0 × 1.6 mmBase partly covered by foot and its foldsLong, thinOneirophanta mutabilis within galls in intestineBay of Biscay, 4796 m abyssal depthM. atrae Takano, Warén & Kano, 2017Globose, pyriform to biconical, transparent to whitish ♀ 5.2 mm; ♂ 2.0-1.5 mmCauldron-shapedLong, thickened at the middle into a collar-likeHolothuria atra, cloacal chamber and respiratory treeJapan, New Caledonia, India Australia, tidal watersM. smithi sp. nov.Globose to biconical, transparent,finally axial striae ♀6.5 mm L ♂ 4.0 mmIn folds of foot and cauldron-shapedSuction disc form, slightly dark colored retractableHolothuria atra cloacal chamberPalmyra Atoll, shallow water