The Cownose ray (Rhinoptera bonasus) is a species of eagle ray found throughout a large part of the western Atlantic and Caribbean, from New England, USA to southern Brazil. It is the most common type of ray found in the Chesapeake Bay, USA, where sport fishermen find the species a nuisance. Cownose rays grows rapidly, and male rays often reach about 35 inches (90 cm) in width and weigh 26 pounds (12 kg). Females typically reach 28 inches (70 cm) in width and weigh 36 pounds (16 kg).
A cownose ray is typically brown-backed with a whitish or yellowish belly. Although its coloration is not particularly distinctive, its shape is easily recognizable. It has a broad head with wide-set eyes, and a pair of distinctive lobes on its subrostral fin. It also has a set of dental plates designed for crushing clams and oyster shells.
A cownose ray has a stinger, called a spine, on its tail, close to the ray's body. This spine has teeth lining its lateral edges, and is coated with a weak venom that which causes symptoms similar to that of a bee sting.
Diets of two congeneric species of crayfish worm (Annelida: Clitellata: branchiobdellidae) from western Canada.(Report)
Apr 01, 2011; Introduction In host-symbiont relationships, host organisms can be viewed as a "landscape" on and in which communities of...