Giant knob shell (35mm) | Umbonium giganteum | Rare Top GEM Quality Skeleton - Umbonium giganteum - 0 mm - 0 mm - 35 mm- Non-CITES species - (1)






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Umbonium giganteum (Riesen-Knopfschnecke), 35 mm diameter, in Original condition, West-Pacific origin, year 1982, Exceptional GEM quality.
Description from the seller
The Jewels of Sand – Perfect Symmetry in Giant Format
Expand your collection with a fascinating master piece of marine evolution: For sale is a perfectly flawless Umbonium giganteum (giant knob snail) in museum-grade GEM quality.
With an impressive diameter of 35 mm, this specimen breaks the typical size boundaries of its genus and represents a rare GIANT SIZE. While most button and wheel snails are tiny beach jewels of a few millimeters, this species is a true giant.
A shiny work of art from the Far East
The genus Umbonium is famous for its lens-shaped, flat-conical shell architecture and its extreme, mirror-like natural gloss. The underside features a massive, smooth callus that gives the shell the feel and look of a polished gemstone. Because these snails live in the sand of tidal and surf zones, most shells show fine hairline cracks, beach wear, or matte patches. A specimen this large in such pristine, undamaged condition with flawless deep luster is an absolute stroke of luck for any high-end display collection or a modern Wunderkammer.
Details at a glance:
Scientific name: Umbonium giganteum (Lessona, 1889)
Size: 35 mm diameter (exceptional monster size for this family)
Quality: Exceptional GEM (flawless, perfect porcelain gloss, undamaged rim)
Origin: West Pacific / East Asian seas
Notes / varieties: Umbonium giganteum
TAGS: Crabs Mollusk Snails Maritime Nautical Nautilus Sea Water Collection
Seller's Story
The Jewels of Sand – Perfect Symmetry in Giant Format
Expand your collection with a fascinating master piece of marine evolution: For sale is a perfectly flawless Umbonium giganteum (giant knob snail) in museum-grade GEM quality.
With an impressive diameter of 35 mm, this specimen breaks the typical size boundaries of its genus and represents a rare GIANT SIZE. While most button and wheel snails are tiny beach jewels of a few millimeters, this species is a true giant.
A shiny work of art from the Far East
The genus Umbonium is famous for its lens-shaped, flat-conical shell architecture and its extreme, mirror-like natural gloss. The underside features a massive, smooth callus that gives the shell the feel and look of a polished gemstone. Because these snails live in the sand of tidal and surf zones, most shells show fine hairline cracks, beach wear, or matte patches. A specimen this large in such pristine, undamaged condition with flawless deep luster is an absolute stroke of luck for any high-end display collection or a modern Wunderkammer.
Details at a glance:
Scientific name: Umbonium giganteum (Lessona, 1889)
Size: 35 mm diameter (exceptional monster size for this family)
Quality: Exceptional GEM (flawless, perfect porcelain gloss, undamaged rim)
Origin: West Pacific / East Asian seas
Notes / varieties: Umbonium giganteum
TAGS: Crabs Mollusk Snails Maritime Nautical Nautilus Sea Water Collection
