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They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Hirnantian ( Late Ordovician ). Currently, there are only four living species.
Brachiopods have two valves (shell sections), which cover the dorsal (top) and ventral (bottom) surface of the animal, unlike bivalve molluscs whose shells cover the lateral surfaces (sides). The valves are unequal in size and structure, with each having its own symmetrical form rather than the two being mirror images of each other.
A mine shell (from German: Minengeschoss, "mine shot") or high-explosive, high-capacity (HEHC) [a] in British military nomenclature, [1] [2] [3] is a military explosive shell type characterized by thin (usually steel) shell walls and a correspondingly high quantity of explosives, much higher than the traditional high-explosive shell type per caliber, meaning that mine shells trade ...
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