Diaphana lactea Jeffreys 1877

• Main Authors: Ohnheiser, Lena Tina, Malaquias, Manuel António E.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Cephalaspidea; Diaphanidae; Diaphana; Diaphana lactea; Faroe Islands; Iceland; Jan Mayen; Norwegian Sea
• Online Access: https://doi.org/10.5281/zenodo.6128202; http://treatment.plazi.org/id/252DDC3C352268017D8BFC74FBF45A41

Diaphana lactea (Jeffreys, 1877) (Figs 5 A–D, 6 A–D) Utriculus lacteus Jeffreys 1877: 334. Retusa lactea — Sykes 1905: 31, pl. 3, fig. 4 Diaphana lactea — Bouchet & Warén 1979: 229 –231, 237. Høisaeter 1986: 100. Schiøtte 1998: 122, figs 22 A, 24 A–C. Sneli et al . 2005: 96. Diaphana jonica Geronimo 1974: 151, 152, pl. 2 fig. 2 (based on Schiøtte 1998). Diagnosis. Shell external, white to transparent, elongate cylindrical, smooth. Body white. Foot posteriorly bifurcated, cephalic shield with tentacular lobes. Rachidian tooth denticulate, asymmetrical, lateral teeth with minute denticulation, teeth on left side smaller than on the right. Type locality. Station 12, Valorous expedition. Material examined. Norwegian Sea, off Trondheim (64°16'54’’ N, 00°11'42’’ W), 3 spcs (dissected), ZMBN 85923, H = 3.7, 3.8 mm. SE of Jan Mayen (70°26'12’’ N, 06°31'48’’ W), 1 spc (dissected), ZMBN 85934, H = 5.8 mm. Norwegian Sea, Trondheim area (63°58'12’’ N, 00°23'42’’ W), 1 spc (dissected), ZMBN 85932, H = 3.9 mm. North of Faroe Islands (63°45'12’’ N, 00°07'60’’ W), 1 spc (dissected), ZMBN 85933, H = 3.9 mm. Between Iceland and Jan Mayen (68°46'57" N, 012°31'39.6" W), 3 sh, ZMBN 90574, H = 2.14–2.26 mm. Shell (Fig. 5 A–D): Maximum H = 5.8 mm. External, thick; white to whitish transparent; elongate cylindrical in shape, middle part of shell straight, narrowing anteriorly and posteriorly, other side uniformly rounded, aperture wide with thin parietal callus, columellar lip straight, apex sunken, mammillate, but protoconch not protruding top of last whorl, umbilicated; shell surface smooth. Animal : Body white. Foot posteriorly bifurcated. Cephalic shield with tentacular lobes posteriorly. Radula (Fig. 6 A–C): Radular formula 11 x 1.1.1. Rachidian tooth with two flat denticulate lobes separated by gap with a pointed small cusp, lobes asymmetrical, right lobe larger. Lateral teeth long, inner edge denticulate. Radula asymmetrical with left inner laterals much smaller than the right laterals, one large denticle on tip of left ...