| Geryon trispinosus | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Brachyura |
| Family: | Geryonidae |
| Genus: | Geryon |
| Species: | G. trispinosus |
| Binomial name | |
| Geryon trispinosus (Herbst, 1803) | |
| Synonyms | |
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Geryon trispinosus is a species of crab that lives in deep water in the north-eastern Atlantic Ocean.
Geryon trispinosus is a small crab, reaching a carapace length of up to 40 millimetres (1.6 in). [2] The carapace is roughly hexagonal in shape, and reddish brown in colour. It is broader than it is long, with three conspicuous teeth on either side at the front. [2] The pereiopods are paler than the carapace; they are quite narrow and long, with the third and fourth pairs being the longest. [2]
Geryon trispinosus is found in the north-eastern Atlantic Ocean. Its range extends from Norway in the north to the Bay of Biscay in the south, [3] and also includes the Canary Islands. [4]
Females reach sexual maturity at a carapace length of 12–15 mm (0.5–0.6 in), while males reach it at 35 mm (1.4 in). [5] Eggs are laid in April, [2] and the eggs hatch into planktonic larvae, which eventually settle as juveniles at depths greater than 1,000 metres (3,300 ft). As they grow, these crabs migrate upwards, with the adults only found at depths of less than 800 m (2,600 ft). Due to the shallow slopes in the north-eastern Atlantic, these migrations involve distances of 20–50 kilometres (12–31 mi). [5]
Geryon trispinosus occurs in the same localities as the squat lobster Munida sarsi . M. sarsi lives abundantly at depths of 700–800 metres (2,300–2,600 ft), and out-competes young G. trispinosus, and limits their survival to those depths where it is absent. Another squat lobster, M. tenuimana , lives at greater depths, but in much lower numbers, and therefore does not impact the survival of G. trispinosus as severely. [5]
Geryon trispinosus was first described in 1803 by Johann Friedrich Wilhelm Herbst, as "Cancer trispinosus", although he described the locality erroneously as the East Indies. In 1837, Henrik Nikolai Krøyer erected the genus Geryon , setting "Geryon tridens" as the type species. This was later synonymised with Herbst's species. [6] In 1989, Raymond B. Manning and Lipke Holthuis erected a new genus, Chaceon , to accommodate most of the species previously in Geryon, which was left with only two species, G. trispinosus and G. longipes from the Mediterranean Sea. [7]
The Caridea, commonly known as caridean shrimp or true shrimp, from the Greek word καρίς, καρίδος, are an infraorder of shrimp within the order Decapoda. This infraorder contains all species of true shrimp. They are found widely around the world in both fresh and salt water. Many other animals with similar names – such as the mud shrimp of Axiidea and the boxer shrimp of Stenopodidea – are not true shrimp, but many have evolved features similar to true shrimp.
Squat lobsters are dorsoventrally flattened crustaceans with long tails held curled beneath the cephalothorax. They are found in the two superfamilies Galatheoidea and Chirostyloidea, which form part of the decapod infraorder Anomura, alongside groups including the hermit crabs and mole crabs. They are distributed worldwide in the oceans, and occur from near the surface to deep sea hydrothermal vents, with one species occupying caves above sea level. More than 900 species have been described, in around 60 genera. Some species form dense aggregations, either on the sea floor or in the water column, and a small number are commercially fished.
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.
Ibacus peronii, the Balmain bug or butterfly fan lobster, is a species of slipper lobster. It lives in shallow waters around Australia and is the subject of small-scale fishery. It is a flattened, reddish brown animal, up to 23 cm (9 in) long and 14 cm (6 in) wide, with flattened antennae and no claws.
Metanephrops boschmai, known as the Bight lobster, Bight scampi or Boschma's scampi, is a species of lobster endemic to Western Australia.
Chaceon fenneri, commonly known as the golden crab or golden deepsea crab, is one of several species of crab harvested for food by humans. It was formerly called Geryon fenneri. Like the blue crab, its common name comes from the color of its shell; it is usually cream to tan in color. Both parts of the binomen Chaceon fenneri commemorate Fenner A. Chace Jr. It is found on the ocean floor at depths of 200 to 1,500 m (660–4,920 ft) in the tropical west Atlantic, ranging from the Gulf of Mexico to Brazil. It cannot swim. The carapace of this large crab measures up to 20 cm (7.9 in), making the entire animal similar in size to a dinner plate. Its diet includes benthic (bottom-dwelling) organisms like mollusks and worms.
Galathea squamifera, the black squat lobster, or Montagu's plated lobster, is a species of squat lobster that lives in the north-east Atlantic Ocean and Mediterranean Sea.
Galathea intermedia is a species of squat lobster in the family Galatheidae. It is found in the north-eastern Atlantic Ocean, as far north as Troms, Norway, south to Dakar and the Mediterranean Sea.
Galathea strigosa is a species of squat lobster in the family Galatheidae. It is found in the northeast Atlantic Ocean, from the Nordkapp to the Canary Islands, and in the Mediterranean Sea and Red Sea. It is edible, but not fished commercially. It is the largest squat lobster in the northeast Atlantic, reaching a length of 90 millimetres (3.5 in), or a carapace length of 53 mm (2.1 in), and is easily identified by the transverse blue stripes across the body.
Scyllarides latus, the Mediterranean slipper lobster, is a species of slipper lobster found in the Mediterranean Sea and in the eastern Atlantic Ocean. It is edible and highly regarded as food, but is now rare over much of its range due to overfishing. Adults may grow to 1 foot (30 cm) long, are camouflaged, and have no claws. They are nocturnal, emerging from caves and other shelters during the night to feed on molluscs. As well as being eaten by humans, S. latus is also preyed upon by a variety of bony fish. Its closest relative is S. herklotsii, which occurs off the Atlantic coast of West Africa; other species of Scyllarides occur in the western Atlantic Ocean and the Indo-Pacific. The larvae and young animals are largely unknown.
Scyllarides is a genus of slipper lobsters.
Eunephrops manningi, the banded lobster, is a species of lobster found in the West Indies. It was named in 1974 by carcinologist Lipke Holthuis after his friend and fellow carcinologist Raymond B. Manning.
Arctides guineensis is a species of slipper lobster that lives in the Bermuda Triangle. It is known in Bermuda as the small Spanish lobster, a name which is also favoured by the FAO.
Scyllarus pygmaeus is a species of slipper lobster that lives in shallow water in the Mediterranean Sea and eastern Atlantic Ocean. It grows to a length of 55 mm (2.2 in), which is too small for it to be fished for food. The juvenile form was first described in 1885, with the description of the adult following in 1888 as a result of the Challenger expedition.
Inachus phalangium, Leach's spider crab, is a species of crabs from the north-eastern Atlantic Ocean and Mediterranean Sea. It is up to 20.5 mm (0.81 in) wide, and is very similar to other species in the genus Inachus.
Munida rugosa, commonly known as the rugose squat lobster or plated lobster, is a species of decapod crustacean found in the north east Atlantic Ocean and the Mediterranean Sea.
Geryonidae is a family of crabs, including the following genera and species:
Chaceon crosnieri is a species of crab.
Chaceon bicolor is a species of crab. Chaceon bicolor differs from all species of the genus in color pattern, with the anterior part of the body purplish rather than reddish. In addition to color pattern, C. bicolor also differs from C. granulatus in having compressed rather than depressed dactyli on the walking legs; also, the hepatic region of the carapace in C. granulatus is coarsely granular, whereas it is smooth in C. bicolor. Juvenile specimens differ from adults in many features: the teeth of the carapace are much larger and sharper, there is a sharp spine on the carpus of the cheliped and a distal spine on the merus of each walking leg, plus the legs are longer and slenderer. Adult females differ from males in having much sharper anterolateral teeth on the carapace, sharper suborbital spines, and much shorter legs, with less trace of a distal dorsal projection on the merus. The carapace of females is more strongly arched from front to back and the protogastric regions are noticeably more inflated. The species is named as such because of its colour patter, purple an tan.
Chaceon is a crab genus in the family Geryonidae, and was first described in 1989 by Raymond Manning and Lipke Holthuis.