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Description ( الإنجليزية )

المقدمة من NMNH Antarctic Invertebrates

Germonea new genus

Type Species: Germonea rachelae new species, by original designation.

Description: Protoconch large (to 4.4 mm), of ~2 1/3 whorls, first 2 whorls smooth, rounded, followed by on­set broad, rounded spiral cords. Transition to teleoconch distinct, marked by axial indentation, change in shell col­or. Teleoconch large (to 67.8 mm), of up to 5 smooth, evenly ovate whorls, with indistinct shoulder, abutting suture. Axial sculpture of fine growth lines, irregular ru­gae near suture. Spiral sculpture of closely spaced cords. Aperture large, narrowly elliptical, with short, broad, si­phonal canal. Outer lip may be slightly reflected, thick­ened along margin. Inner lip with glossy parietal callus, long columella, siphonal fold. Neither siphonal fasciole, nor pseudoumbilicus present. Periostracum thin, tightly adherent. Operculum large (~0.65 AL), long, narrow, with terminal nucleus at end of strongly curved anterior margin. Columellar muscle very short (~ ½ whorl). Foot with deep propodial cleft. Head large, with short neck, large black eyes at base of broad, tapering tentacles. Buccal mass large, filling proboscis. Odontophore short­er, radula longer than buccal mass. Rachidian teeth long, narrow (L/W ~2.5), Y-shaped, with 3 stout, radially ori­ented cusps, central cusp longest. Lateral teeth with 3­-4 cusps of similar length along innermost 2/3 of basal plate. Salivary glands large, right larger than left. Gland of Leiblein large, ascinous. Oesophagus thick, broad. Stomach U-shaped, lacking posterior mixing area.

Etymology: The genus is named after Mrs. Rachel (Raye) N. Germon, in recognition of her years of work in managing the collections of Antarctic Mollusca at the National Museum of Natural History, Smithsonian In­stitution.”

(Harasewych & Kantor, 2004: 20)

ترخيص
cc-by-nc
مؤلف
Harasewych & Kantor, 2004: 20
المشروع
Smithsonian National Museum of Natural History - Antarctic Invertebrates
النص الأصلي
زيارة المصدر
موقع الشريك
NMNH Antarctic Invertebrates