| Physetocaris | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Caridea |
| Superfamily: | Physetocaridoidea Chace, 1940 |
| Family: | Physetocarididae Chace, 1940 |
| Genus: | Physetocaris Chace, 1940 |
| Species: | P. microphthalma |
| Binomial name | |
| Physetocaris microphthalma Chace, 1940 | |
Physetocaris is a monotypic genus of caridean shrimp, containing a single species, [1] Physetocaris microphthalma.
Physetocaris microphthalma was previously placed in its own family (Physetocarididae) and superfamily (Physetocaridoidea). [1] Molecular phylogenetic analysis has revealed that the species actually belongs within the family (Pandalidae) and superfamily (Pandaloidea). [2] The genus and species were described in 1940 by Fenner A. Chace Jr.
Adults have no eyes, and are missing the last segment of the first pereiopod, which is therefore unable to form a claw. [3] They also have reduced gills and mouthparts, and no exopods on the pereiopods. [3] The carapace is enlarged, and forms a tall rostrum. [3]
P. microphthalma is rare, with only 35 specimens counted in a 1985 review. [3] Although very poorly known, the distribution of Physetocaris appears to be very wide. In addition to specimens from both western and eastern parts of the Atlantic Ocean, [4] [5] it has been found in the southern Pacific Ocean. [6]
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.
Dendrobranchiata is a suborder of decapods, commonly known as prawns. There are 540 extant species in seven families, and a fossil record extending back to the Devonian. They differ from related animals, such as Caridea and Stenopodidea, by the branching form of the gills and by the fact that they do not brood their eggs, but release them directly into the water. They may reach a length of over 330 millimetres (13 in) and a mass of 450 grams (1.0 lb), and are widely fished and farmed for human consumption.
The Decapoda or decapods is a large order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers. The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species. Nearly half of these species are crabs, with the shrimp and Anomura including hermit crabs, king crabs, porcelain crabs, squat lobsters making up the bulk of the remainder. The earliest fossils of the group date to the Devonian.
The Stenopodidea or boxer shrimps are a small group of decapod crustaceans. Often confused with Caridea shrimp or Dendrobranchiata prawns, they are neither, belonging to their own group.
Amphionides reynaudii is a species of caridean shrimp, whose identity and position in the crustacean system remained enigmatic for a long time. It is a small planktonic crustacean found throughout the world's tropical oceans, which until 2015 was considered the sole representative of the order Amphionidacea, due to unusual morphological features. Molecular data however confirm it as a member of the caridean family Pandalidae, and the confusion of morphology is because only larval phases have so far been studied.
The family Pandalidae is a taxon of caridean shrimp. These species are commonly called pandalid shrimp. They are edible and have high economic value. They are characterised by the subdivided carpus of the second pereiopod and, mainly, by the lack of the chelae (claws) on the first pereiopod. This is a cold-water family, and their representation in tropical areas is made by deep-sea shrimp. The genus Physetocaris, sometimes placed in this family, is now considered to be in its own family, Physetocarididae.
Psalidopus is a genus of shrimp placed in its own family, Psalidopodidae, and superfamily, Psalidopodoidea. It comprises three species, one in the western Atlantic Ocean, and two in the Indo-Pacific.
Galatheacaris abyssalis is a rare species of shrimp, now thought to be a larval stage of another genus, Eugonatonotus.
The Processidae are a family of shrimp, comprising 65 species in five genera, and the only family in the superfamily Processoidea. They are small, nocturnal animals, mostly living in shallow seas, particularly on grass flats. The first pereiopods are usually asymmetrical, with a claw on one, but not the other. The rostrum is generally a simple projection from the front of the carapace, with two teeth, one at the tip, and one further back.
Heterocarpus is a genus of deep-sea shrimp, mainly of tropical areas all over the world.
Lysmata is a genus of shrimp in the infraorder Caridea, the caridean shrimp. The genus belongs to the family Lysmatidae. Lysmata are popular ornamental shrimp in the marine aquarium trade for their bright color patterns, interesting behaviors, and ability to control certain aquarium pests such as sea anemones of the genus Aiptasia. They are known to command high prices on the pet market.
Urocaridella antonbruunii, common names clear cleaner shrimp or red-white cleaner shrimp, is a species of shrimp belonging to the family Palaemonidae. It was described by A. J. Bruce in 1967. It is one of the species that are known as cleaner shrimps.
Birulia is a genus of shrimp in the family Thoridae. It was formerly considered to be part of the family Hippolytidae.
Campylonotoidea is a superfamily of shrimp, containing the two families Campylonotidae and Bathypalaemonellidae. Fenner A. Chace considered it to be the sister group to the much larger superfamily Palaemonoidea, with which it shares the absence of endopods on the pereiopods, and the fact that the first pereiopod is thinner than the second. Using molecular phylogenetics, Bracken et al. proposed that Campylonotoidea may be closer to Atyoidea. There are sixteen described species in 3 genera; no fossils are known.
Albunea carabus is a rare species of "sand crab" or "mole crab" in the family Albuneidae. It lives in shallow, turbulent waters in sandy areas of the tropical eastern Atlantic Ocean and the Mediterranean Sea.
Ogyrides, also known as long eyed shrimps, is a genus of decapod crustaceans consisting of 13 species. It is the only genus in the monotypic family Ogyrididae.
Parhippolyte is a genus of cave dwelling decapod crustaceans, known as cave shrimps from the family Barbouriidae The type species Parhippolyte uveae was described in 1900 by the English carcinologist Lancelot Alexander Borradaile from specimens collected in the south western Pacific by Arthur Willey. As their vernacular name of cave shrimp suggests these species are generally found in marine caves as well as anchialine ponds and lagoons.
Leptochela is a genus of small, shallow-water shrimp from the family Pasiphaeidae. They are found in the Indo-Pacific region and the western Atlantic with an isolated species in Hawaii, they are absent from the eastern Atlantic Ocean and were absent from the eastern Pacific but specimens of a species widespread in the western Atlantic were collected from waters to the south of the tip of Baja California. Two species, Leptochela aculeocaudata and Leptochela pugnax have invaded the eastern Mediterranean from the Red Sea through the Suez Canal and are thus classified as Lessepsian migrants.
Periclimenes, commonly known as glass shrimp or cleaner shrimp, is a commensal and often symbiotic genus of semi-transparent shrimp within the family Palaemonidae. Species of this large genus feature a wide variety of coloration and patterns, widespread distribution throughout much of the world's tropical oceans, and are often sought out for aquarium trade.
Paracrangon is a genus of deep-sea shrimp in the family Crangonidae, found on the Pacific coasts of North America, Asia, and Australia. Morphologically, they are notable for several autapomorphies, most significantly their unique lack of second pereopods, but also for their partially flexible abdomen, which allows them to assume their defensive cataleptic posture. Species also have long spines covering their carapace. They are distinctive among the Crangonid shrimp, and are almost certainly monophyletic. All species except Paracrangon echinata, the type species, are quite rare.