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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 maximum recorded size was 61.2 mm (2.41 in) OCL (Occipital Carapace Length) which is used to measure the species' size. [4] The rostrum is short and in individuals over 50 mm (2.0 in) OCL usually does not reach the base of the third antenna segment. In those measuring 20–140 mm (0.79–5.51 in) OCL the rostrum is to the base or midpoint ...
Compared to other species of crayfish in its range, L. chimera is a sizable crayfish. On average, adults of this species range from about 9.5 to 11.8 centimeters (or 3.7 to 4.7 inches) in body length, measuring from the anterior tip of the rostrum to the posterior tip of the telson.
It is chiefly differentiated from the other species in the genus Cherax by the form of the rostrum, the shape of the claws and the small size of its eyes. [2] In C. holthuisi, the rostrum has two indentations on each side, and several indistinct lobes; in most other species, there are 3–8 teeth on the rostrum. [2]
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 ...
Austropotamobius torrentium, also called the stone crayfish, is a European species of freshwater crayfish in the family Astacidae. It is mostly found in tributaries of the Danube , having originated in the northern part of the Balkan Peninsula .
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.
The rostrum narrows anteriorly, appearing slightly pinched in the middle, with ridges typically of a rust-orange color, and marginal spines are present. The claws of this species may get quite large in proportion to body size, they have somewhat prominent tubercles , and there is a relatively significant gap between the fingers of the claws ...