4752 x 2652 px | 40,2 x 22,5 cm | 15,8 x 8,8 inches | 300dpi
Date de la prise de vue:
22 octobre 2015
Lieu:
Shoeburyness Essex
Informations supplémentaires:
Lobsters are invertebrates with a hard protective exoskeleton. Like most arthropods, lobsters must moult to grow, which leaves them vulnerable. During the moultin process, several species change colour. Lobsters have 10 walking legs; the front three pairs bear claws, the first of which are larger than the others.[4] Although, like most other arthropods, ¬¬¬are largely bilaterally symmetrical, some genera possess unequal, specialized claws. Lobster anatomy includes the cephalothorax which fuses the head and the thorax, both of which are covered by a chitinous carapace, and the abdomen. The lobster's head bears antennae, antennules, mandibles, the first and second maxillae, and the first, second, and third maxillipeds. Because lobsters live in murky environments at the bottom of the ocean, they mostly use their antennae as sensors. The lobster eye has a reflective structure above a convex retina. In contrast, most complex eyes use refractive ray concentrators (lenses) and a concave retina.[5] The abdomen includes swimmerets and its tail is composed of uropods and the telson. Lobsters, like snails and spiders, have blue blood due to the presence of hemocyanin which contains copper.[6] In contrast, vertebrates and many other animals have red blood from iron-rich hemoglobin. Lobsters possess a green hepatopancreas, called the tomalley by chefs, which functions as the animal's liver and pancreas.[7] Lobsters of the family Nephropidae are similar in overall form to a number of other related groups. They differ from freshwater crayfish in lacking the joint between the last two segments of the thorax, [8] and they differ from the reef lobsters of the family Enoplometopidae in having full claws on the first three pairs of legs, rather than just one.[8] The distinctions from fossil families such as the Chilenophoberidae are based on the pattern of grooves on the carapace.[8] Longevity[edit] Lobsters live up to an estimated 70 years, [9] although determining age is difficult.[10]
