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Showa Shell Sekiyu K.K. (昭和シェル石油株式会社, Shōwa Sheru Sekiyu kabushiki gaisha) was a Japanese company that operated as a subsidiary of Royal Dutch Shell until it was acquired by Idemitsu Kosan in 2018 and integrated into the company the following year.
The length of the shell attains 2 mm, its diameter 1.25 mm. (Original description) The small shell is ovate, thin and translucent. Its colour is white. It contains four rounded whorls, parted by deep sutures. Sculpture: First whorl and a half are smooth The next show about twenty-five sharp though delicate radial ribs.
Alvania esmes; Shell of Alvania esmes (holotype at MNHN, Paris) Scientific classification; Domain: Eukaryota: ... Alvania esmes is a species of small sea snail, ...
The length of the shell attains 2.4 mm, its diameter 1.1 mm. (Original description) The white shell is elongate-conic. The 1½ whorls of the protoconch are well rounded, apparently with several spiral lirations, which are ill-defined on the somewhat eroded surface of the specimens. The whorls of the teleoconch are shouldered at the summit. They ...
The length of the shell attains 2.6 mm, its diameter 1.6 mm. The thick, somewhat shining, brownish shell is depressed conical. It shows 10-12 strong, close, rounded ribs, subnodose at the suture, and on the angulated periphery of the body whorl. The shell contains 5½ flattened whorls that are rapidly increasing. [2]
The length of the shell attains 2.5 mm. (Described as Rissoa (Alvania) trajectus) The small, white shell is strong, conic-obovate and reticulated.It has a tumid body whorl, a broad round base, a short spire, a few conical whorls, an excavated suture, and a short pear-shaped aperture.
The length of the shell varies between 1.5 mm and 3.7 mm. The shell resembles Alvania lineata , but the decussations are deeper, giving the nodules a rough appearance. [ 2 ]
Alvania cruzi is a species of small sea snail, ... The length of the shell varies between 2.2 mm and 3 mm. This section needs expansion. You can help by adding to ...