$18.21 Buy It Now or Best Offer
free,30-Day Returns
Seller Store shropshirecrystalsltd
(2513) 100.0%,
Location: craven arms
Ships to: US,
Item: 234720738342
Return postage will be paid by:Buyer
Returns Accepted:Returns Accepted
After receiving the item, your buyer should cancel the purchase within:14 days
Sub-Type:Echinoids/ Sea Urchins
Type:Fossils
Shape:Natural
Echinoid:Common name; Sea urchin
Genuine Fossil:Authentic fossilised prehistoric
Fossil stone:Limestone & Calcite
Country/Region of Manufacture:Morocco
Finish:Unpolished
Modified Item:No
500 grams chosen at random Photographs are for illustration purposes only. Lots may differ slightly as each item is totally unique Gymnocidaris koechlini Echinoid, Jurassic Morocco Despite their alien appearance, echinoids, or sea-urchins as they are better known, are very common in the seas and oceans of today and are common fossils too. Their name derives from the Greek 'echin' ('spiny'), referring to their protective spines and presumably 'ooid' (egg-like) in reference to their globular shell, or test as it is known. Echinoids are part of a much larger group of animals known as the Echinoderms ('spiny-skins'), which also includes the Asteroids (starfish), Holothurians (sea cucumbers), Crinoids (sea lilies and feather stars) and the Ophiuroids (brittle stars). Though their body plans are varied, all echinoderms possess key features which unite the group: * A complex skeleton of calcareous plates, with a unique spongy structure known as stereom. * Five planes of symmetry, referred to as penta-radial. * An internal hydrostatic (water-vascular) system, external extensions of which are used for locomotion, respiration and feeding. * All live in marine waters Echinoderms first appeared in the fossil record in the Cambrian around 530 million years ago and quickly diversified into many groups. Echinoids appeared in the Ordovician (around 450 million years ago (mya) but were not very successful at first and other groups such as crinoids dominated the Palaeozoic. By the beginning of Mesozoic (250 mya) many of the earlier echinoderm groups were extinct or in decline and the Echinoids rose to abundance. They diversified through the Jurassic (210-145 mya) and have remained successful ever since. For all lots When bidding and buying items from us you can be assured that: Items offered are unconditionally guaranteed to be authentic. Postage will be handled quickly and professionally. All items posted up to 48 hours after payment is made with signed for mail. For multiple purchases shipping will be combined and discounted
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