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The region rostral to the cephalic groove, which separates the head and thorax region, is characterized by the presence of eyes, antennae and claws while the region caudal contains four pairs of walking legs. This is the crayfish's primary mode of locomotion. [2] [3] The abdominal section of the crayfish is divided into seven segments. These ...
Rostrum (from Latin rostrum, meaning beak) is a term used in anatomy for several kinds of hard, beak-like structures projecting out from the head or mouth of an animal. Despite some visual similarity, many of these are phylogenetically unrelated structures in widely varying species.
Pontastacus leptodactylus, [2] the Danube crayfish, [3] Galician crayfish, [3] Turkish crayfish [4] or narrow-clawed crayfish, is a relatively large and economically important species of crayfish native to fresh and brackish waters in eastern Europe and western Asia, mainly in the Pontic–Caspian region, among others including the basins of the Black Sea, and the Danube, Dnieper, Don and ...
The beak, bill, or rostrum is an external anatomical structure found mostly in birds, but also in turtles, non-avian dinosaurs and a few mammals. A beak is used for pecking , grasping , and holding (in probing for food, eating , manipulating and carrying objects, killing prey , or fighting), preening , courtship , and feeding young.
The rostrum is short reaching at most the middle of the third segment of the antenna, often only to the base of that segment. The cephalon (head) is generally poorly to moderately spined with relatively few spines, of small size or rounded bumps. Sharp spines sometimes found on smaller specimens.
The Hell Creek Crayfish lacks pigment in its body and does not have eyes. It reaches an overall body length of 2.5 to 3.0 inches. [3] It has a convergent rostrum, which is the beak-like shell located between the crayfish's eyes. [5] Its areola is narrow, and if a cervical spine is present, it is very small.
Malacostraca is the second largest of the six classes of pancrustaceans behind insects, containing about 40,000 living species, divided among 16 orders.Its members, the malacostracans, display a great diversity of body forms and include crabs, lobsters, spiny lobsters, crayfish, shrimp, krill, prawns, isopods, amphipods, mantis shrimp, and many other less familiar animals.
Rostrum may refer to: Any kind of a platform for a speaker: dais; pulpit; podium; Rostrum (anatomy), a beak, or anatomical structure resembling a beak, as in the mouthparts of many sucking insects; Rostrum (ship), a form of bow on naval ships; Rostrum Records, an American record label; The Rostrum, the official monthly magazine of the National ...