Lobster stack
This article is about clawed lobsters. Not to be confused with Homeridae. They have long bodies with muscular tails and live in crevices or burrows lobster stack the sea floor.
Northern Hemisphere genus Nephrops and the Southern Hemisphere genus Metanephrops. Although several other groups of crustaceans have the word “lobster” in their names, the unqualified term “lobster” generally refers to the clawed lobsters of the family Nephropidae. Lobsters are invertebrates with a hard protective exoskeleton. Like most arthropods, lobsters must shed to grow, which leaves them vulnerable. During the shedding process, several species change color. Lobster anatomy includes two main body parts: the cephalothorax and the abdomen. The cephalothorax fuses the head and the thorax, both of which are covered by a chitinous carapace.
Lobsters, like snails and spiders, have blue blood due to the presence of hemocyanin, which contains copper. In contrast, vertebrates, and many other animals have red blood from iron-rich hemoglobin. Lobsters of the family Nephropidae are similar in overall form to several other related groups. Analysis of the neural gene complement revealed extraordinary development of the chemosensory machinery, including a profound diversification of ligand-gated ion channels and secretory molecules. Typically, lobsters are dark colored, either bluish-green or greenish-brown, to blend in with the ocean floor, but they can be found in many colors. Sub-type of split-colored, specifically orange and black. Lobsters live up to an estimated 45 to 50 years in the wild, although determining age is difficult: it is typically estimated from size and other variables.
Newer techniques may lead to more accurate age estimates. Research suggests that lobsters may not slow down, weaken or lose fertility with age and that older lobsters may be more fertile than younger. Like many decapod crustaceans, lobsters grow throughout life and can add new muscle cells at each moult. Lobster longevity allows them to reach impressive sizes. According to Guinness World Records, the largest lobster ever caught was in Nova Scotia, Canada, weighing 20. Lobsters live in all oceans, on rocky, sandy, or muddy bottoms from the shoreline to beyond the edge of the continental shelf. They generally live singly in crevices or in burrows under rocks.
Lobsters are omnivores and typically eat live prey such as fish, mollusks, other crustaceans, worms, and some plant life. They scavenge if necessary and are known to resort to cannibalism in captivity. However, when lobster skin is found in lobster stomachs, this is not necessarily evidence of cannibalism because lobsters eat their shed skin after moulting. However, they swim backward quickly when they flee by curling and uncurling their abdomens. This is known as the caridoid escape reaction. Symbiotic animals of the genus Symbion, the only known member of the phylum Cycliophora, live exclusively on lobster gills and mouthparts. For the species of flowering plants, see Lobster-claw.
