|Genus:|| Thymops |
Nephropides birsteiniZarenkov & Semenov, 1972
Thymops birsteini, the Patagonian lobsterette, is a species of lobster found around the coasts of South America, particularly the South Atlantic. It belongs to the monotypic genus Thymops.
T. birsteini is found on the continental shelf around South America, particularly in the Argentine Sea. In the Atlantic Ocean, it is found south of 37° south, with Uruguay representing the northern extremity of its distribution; 120–1,500 metres (390–4,920 ft).on the Chilean (Pacific) side, it is found south of 51° south. Its range includes the areas around the Falkland Islands (Islas Malvinas) and areas near South Georgia, extending as far south as 57°, close to the Antarctic Peninsula. It lives at depths of
T. birsteini resembles a typical lobster, with two large claws, four other pairs of pereiopods, and a long pleon (tail). The carapace is granular, especially in the front half, and it bears a rostrum which divides into two points at its tip. 8 to 25 centimetres (3.1 to 9.8 in), with the carapace being 2–10 cm (0.79–3.94 in) long. Smaller individuals are found in shallower waters, and larger individuals are found at greater depths (up to 1,400 m or 4,600 ft). There is also latitudinal variation in colour, with northern individuals being pale yellow, while those from further south are maroon.The total length may range from
Little is known about the biological interactions of T. birsteini. It is occasionally eaten by the Patagonian toothfish Dissostichus eleginoides.It seems to prefer muddy bottoms, and has been observed entering and exiting burrows.
As in other pleocyemates, T. birsteini broods its eggs on the female's pleopods. One female may carry up to 380 eggs, each 1.5–1.9 millimetres (0.059–0.075 in) in diameter. The eggs grow as they develop to a size of 2.9–3.3 mm (0.11–0.13 in). Newly hatched larvae have a carapace length of 1.7–2.2 mm (0.067–0.087 in), and are present in smaller numbers than the eggs, with a maximum of 43 observed on a single female. This extended larval release has previously been found in other sub-Antarctic decapods, and is an adaptation to the low temperature, the long time taken for brooding, and the low overall fecundity.
The meat of T. birsteini is reported to be excellent, 150 grams (5.3 oz), of which 30% (45 g or 1.6 oz) is the meaty tail. Daily yields of 19 kilograms (42 lb) are typical.and it is thought that the species could be commercially exploited if sufficient concentrations could be discovered. The average weight of a caught individual is about
The Patagonian toothfish is a species of notothen found in cold waters between depths of 45 and 3,850 m in the southern Atlantic, Pacific, and Indian Oceans and Southern Ocean on seamounts and continental shelves around most Subantarctic islands.
The Cape lobster, Homarinus capensis, is a species of small lobster that lives off the coast of South Africa, from Dassen Island to Haga Haga. Only a few dozen specimens are known, mostly regurgitated by reef-dwelling fish. It lives in rocky reefs, and is thought to lay large eggs that have a short larval phase, or that hatch directly as a juvenile. The species grows to a total length of 10 cm (3.9 in), and resembles a small European or American lobster; it was previously included in the same genus, Homarus, although it is not very closely related to those species, and is now considered to form a separate, monotypic genus – Homarinus. Its closest relatives are the genera Thymops and Thymopides.
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The colossal squid, sometimes called the Antarctic squid or giant cranch squid, is believed to be the largest squid species in terms of mass. It is the only recognised member of the genus Mesonychoteuthis and is known from only a small number of specimens. The species is confirmed to reach a mass of at least 500 kilograms (1,100 lb), though the largest specimens—known only from beaks found in sperm whale stomachs—may perhaps weigh as much as 600–700 kilograms (1,300–1,500 lb), making it the largest-known invertebrate. Maximum total length has been estimated at 9–10 metres (30–33 ft).
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