Terebratalia tisimana (Nomura et Hatai, 1936)

Diestothyris tisimana Nomura, Hatai, 1936: 131–134, text-figs. 1–10.

Tisimania tisimana Hatai, 1938: 203.

Diestothyris (Tisimania) tisimana Hatai, 1940: 274–275, pl. 4, figs. 1–4, 7, 9.

Terebratalia coreanica occidentis Konzhukova, 1957: 29–31, pl. 3, figs. 1–12, pl.4, figs. 1–4.

Terebratalia coreanica ochotica Konzhukova, 1957: 31–35, pl. 4, figs. 5–8, pl. 5, figs. 1–4.

Terebratalia coreanica beringiana Konzhukova, 1957: 35–36, pl. 5, figs. 5–8.

Terebratalia tisimana Zezina, 1970: 446–449.

Terebratalia (Tisimania) tisimana Zezina, 1997: 66–67, figs. 41, 42.

Description. Shell of gray colour with length up to 42 mm has thick valves, pores are very dense. Anterior commissure is straight (rectimarginate). Deltidial plates do not meet each other and foramen is open anteriorly. Outer surface of shell is smooth with concentric lines of growth at the anterior part. Pedicle collar is wide, striped with longitudinal lines. Dental plates are weakened near the bottom of pedal valve. Cardinal process is narrow, transversal and covered with small numerous furrows. Middle septum does not reach hinge margin and stretches anteriorly up to half of the brachial valve.

Distribution. The species is distributed from the Povorotny Cap (Peter the Great Bay) to the north along the coast of Asia to Shelikhov Bay. It is known well near western and eastern coast of Kamchatka, around Middle and Northern Kuril Islands, near the Commander Islands and off the Unimak (Aleutian Islands).

References:

The World Register of Marine Species