A horn is a permanent pointed projection on the head of various animals that consists of a covering of keratin and other proteins surrounding a core of live bone.Horns are distinct from antlers, which are not permanent.In mammals, true horns are found mainly among the ruminant artiodactyls, [not verified in body] in the families Antilocapridae and Bovidae (cattle, goats, …

The nail consists of the nail plate, the nail matrix and the nail bed below it, and the grooves surrounding it. Parts of the nail. The matrix, sometimes called the matrix unguis, keratogenous membrane, nail matrix, or onychostroma, is the active tissue (or germinal matrix) that generates cells, which harden as they move outward from the nail root to the nail plate.

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The hyoid bone (lingual bone or tongue-bone) (/ ˈ h aɪ ɔɪ d /) is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid cartilage.At rest, it lies between the base of the mandible and the third cervical vertebra.. Unlike other bones, the hyoid is only distantly articulated to other bones by muscles or ligaments. . It is the only bone in the ...

Diagnostic characters. Ammonites (subclass Ammonoidea) can be distinguished by their septa, the dividing walls that separate the chambers in the phragmocone, by the nature of their sutures where the septa join the outer shell wall, and in general by their siphuncles.. Septa. Ammonoid septa characteristically have bulges and indentations and are to varying degrees convex when …

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The anglerfish are fish of the teleost order Lophiiformes (/ ˌ l ɒ f i ɪ ˈ f ɔːr m iː z /). They are bony fish named for their characteristic mode of predation, in which a modified luminescent fin ray (the esca or illicium) acts as a lure for other fish. The luminescence comes from symbiotic bacteria, which are thought to be acquired from seawater, that dwell in and around the sea.

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