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The height of the shell varies between 10 mm and 20 mm. The pointed, imperforate, solid shell has an elongated conic shape. It is polished, yellowish, pink, or olive-green, with reddish or olive longitudinal lines in pairs, sometimes separate on the body whorl, and usually with numerous narrow, rather obscure spiral pink or yellowish lines.
Today, vaquitas are listed as critically endangered. On the brink of extinction, the vaquita is the smallest living species of cetacean. ©Paula Olson, NOAA, Public domain, via Wikimedia Commons ...
A paleontologist hailed the discovery as "truly an unusual find," adding it helped explain the relationships in the prehistoric food chain.
Mollusc shells (especially those formed by marine species) are very durable and outlast the otherwise soft-bodied animals that produce them by a very long time (sometimes thousands of years even without being fossilized). Most shells of marine molluscs fossilize rather easily, and fossil mollusc shells date all the way back to the Cambrian period.
The Registry of World Record Size Shells is a conchological work listing the largest (and in some cases smallest) verified shell specimens of various marine molluscan taxa.A successor to the earlier World Size Records of Robert J. L. Wagner and R. Tucker Abbott, it has been published on a semi-regular basis since 1997, changing ownership and publisher a number of times.
The group Pteropoda was established by Cuvier as "ptéropodes" in 1804. [4] François Péron and Charles Alexandre Lesueur thought the group to be larger, and so they also included the opisthobranch taxa (Phyllirhoë and Glaucus), the heteropoda taxa (Carinaria and Firola), and even the Ctenophora ().
Thieves have stolen four ancient artifacts, including an approximately 2,500-year-old gold helmet, after using explosives to break into a museum in the Netherlands. The daring heist took place at ...
As Joseph Rosewater [1] commented in 1961: "“The Pinnidae have considerable economic importance in many parts of the world. They produce pearls of moderate value. In the Mediterranean area, material made from the holdfast or byssus of Pinna nobilis Linné has been utilized in the manufacture of clothing for many centuries: gloves, shawls, stockings and cloaks.