Bankivia fasciata
A variable, polished sea snail of the Trochidae family.
Bankivia fasciata, called the banded kelp shell, is a marine gastropod mollusk in the family Trochidae, the top snails. Its thin, imperforate, turreted shell is polished and shiny, measuring 15 to 25 mm in length. The species varies widely in size and color: shells can be white, creamy, or pink, with spiral bands of pink, purplish-red, or purplish-brown, or with narrow oblique zigzag stripes of pinkish-brown, often featuring a narrow dark or pinkish band just below the suture. The spire is tall and slender, with a slightly blunt dark apex. The roughly nine whorls are very slightly convex and a little indented below the sutures. Under a lens, the surface shows very dense, fine spiral striations. The body whorl is rounded, and the base has a few separate, impressed concentric lines. The aperture is ovate, with a thin, acute outer lip. The columella is sinuous, arcuate above, narrowly reflexed, and obliquely truncate below. This species occurs in the Gulf of Aqaba, off Mozambique, from New South Wales to South Australia, and off Tasmania.
Quick Facts
- Taxon
- Bankivia fasciata
Facts from the source article.
Lore & Background
The shell of Bankivia fasciata is thin, imperforate, and elongated with a turreted shape. It is polished and shining, with a white, creamy, or pink base color, adorned with spiral bands of pink, purplish-red, or purplish-brown, or narrow oblique zigzag stripes of pinkish-brown, often with a narrow subsutural fascia of dark or pinkish. The spire is elevated and slender, with a dark, slightly blunt apex. The approximately 9 whorls are very slightly convex and a trifle impressed below the sutures. Under a lens, the surface is very densely, finely spirally striate. The body whorl is rounded, and the base shows a few concentric, separated, impressed lines. The aperture is ovate, the thin outer lip is acute, and the sinuous columella is arcuate above and narrowly reflexed, obliquely truncate below.
Reader's Guide
Bankivia fasciata is a variable species in size and coloration, making it a notable subject for malacologists studying intraspecific variation. Its distribution spans the Gulf of Aqaba, Mozambique, and extensive Australian waters including New South Wales, South Australia, and Tasmania, indicating a broad Indo-Pacific range. The species has been documented in multiple regional catalogs and studies, such as those by Pritchard & Gatliff (1902) for Victoria, Shirley (1911) for Queensland, Cotton (1959) for South Australia, and Iredale & McMichael (1962) for New South Wales. Its presence in the Gulf of Aqaba was specifically noted by Barash, Danin & Yaron (1980). The shell's polished, banded appearance and turreted shape contribute to its recognition among top snails, and its detailed description in the literature underscores its role in understanding trochid morphology and biogeography.
Did You Know?
- The shell length of Bankivia fasciata varies between 15 mm and 25 mm.
- It has about 9 whorls that are very slightly convex.
- The species occurs in the Gulf of Aqaba, off Mozambique, and off New South Wales to South Australia and Tasmania.
- The columella is sinuous, arcuate above, and obliquely truncate below.
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