Branchiopoda

Branchiopoda is a class of crustaceans. It comprises fairy shrimp, clam shrimp, Diplostraca (or Cladocera), Notostraca and the Devonian ''Lepidocaris''. They are mostly small, freshwater animals that feed on plankton and detritus.

Description

Members of the Branchiopoda are unified by the presence of gills on many of the animals' appendages, including some of the mouthparts. This is also responsible for the name of the group (from the grc, βράγχια, gills, akin to , windpipe; el, πούς, foot). They generally possess compound eyes and a carapace, which may be a shell of two valves enclosing the trunk (as in most Cladocera), broad and shallow (as in the Notostraca), or entirely absent (as in the Anostraca). In the groups where the carapace prevents the use of the trunk limbs for swimming (Cladocera, clam shrimp and the extinct Lipostraca), the antennae are used for locomotion, as they are in the nauplius. Male fairy shrimp have an enlarged pair of antennae with which they grasp the female during mating, while the bottom-feeding Notostraca, the antennae are reduced to vestiges. The trunk limbs are beaten in a metachronal rhythm, causing a flow of water along the midline of the animal, from which it derives oxygen, food and, in the case of the Anostraca and Notostraca, movement.

Ecology

Among the branchiopods, only some cladocerans are marine; all the other groups are found in continental fresh water, including temporary pools and in salt lakes. Most branchiopodans eat floating detritus or plankton, which they take using the setae on their appendages.

Taxonomy

In early taxonomic treatments, the current members of the Branchiopoda were all placed in a single genus, ''Monoculus''. The taxon Branchiopoda was erected by Pierre André Latreille in 1817, initially at the rank of order.

The current upper-level classification of Branchiopoda, according to the World Register of Marine Species (2021), is as follows:

Class Branchiopoda Latreille, 1817
: Subclass Sarsostraca Tasch, 1969
::Order Anostraca Sars, 1867
:::Suborder Anostracina Weekers et al., 2002
:::Suborder Artemiina Weekers et al., 2002
: Subclass Phyllopoda Preuss, 1951
:: Superorder Diplostraca Gerstaecker, 1866
::: Order Anomopoda G.O. Sars, 1865
::: Order Ctenopoda G.O. Sars, 1865
::: Order Cyclestherida Sars G.O., 1899
::: Order Haplopoda G.O. Sars, 1865
::: Order Laevicaudata Linder, 1945
::: Order Onychopoda G.O. Sars, 1865
::: Order Spinicaudata Linder, 1945
:: Order Notostraca G. O. Sars, 1867
::Genus † Cryptocaris Barrande, 1872
::Genus † Dithyrocaris
In addition, the extinct genus ''Lepidocaris'' is generally placed in Branchiopoda.

Anostraca

The fairy shrimp of the order Anostraca are usually long (exceptionally up to ). Most species have 20 body segments, bearing 11 pairs of leaf-like ''phyllopodia'' (swimming legs), and the body lacks a carapace. They live in vernal pools and hypersaline lakes across the world, including pools in deserts, in ice-covered mountain lakes and in Antarctica. They swim "upside-down" and feed by filtering organic particles from the water or by scraping algae from surfaces. They are an important food for many birds and fish, and are cultured and harvested for use as fish food. There are 300 species spread across 8 families.

Lipostraca

Lipostraca contains a single extinct Early Devonian species, '' Lepidocaris rhyniensis'', which is the most abundant animal in the Rhynie chert deposits. It resembles modern Anostraca, to which it is probably closely related, although its relationships to other orders remain unclear. The body is long, with 23 body segments and 19 pairs of appendages, but no carapace. It occurred chiefly among charophytes, probably in alkaline temporary pools.

Notostraca

The order Notostraca comprises the single family Triopsidae, containing the tadpole shrimp or shield shrimp. The two genera, '' Triops'' and ''Lepidurus'', are considered living fossils, having not changed significantly in outward form since the Triassic. They have a broad, flat carapace, which conceals the head and bears a single pair of compound eyes. The abdomen is long, appears to be segmented and bears numerous pairs of flattened legs. The telson is flanked by a pair of long, thin caudal rami. Phenotypic plasticity within taxa makes species-level identification difficult, and is further compounded by variation in the mode of reproduction. The evidence of phenotypic plasticity of Arctic tadpole shrimp (''Lepidurus arcticus'', Notostraca) has been observed in Svalbard. Notostracans are the largest branchiopodans and are omnivores living on the bottom of temporary pools, ponds and shallow lakes.

Laevicaudata, Spinicaudata and Cyclestherida (once Conchostraca)

Clam shrimp are bivalved animals which have lived since at least the Devonian. The three groups are not believed to form a clade. They have 10–32 trunk segments, decreasing in size from front to back, and each bears a pair of legs which also carry gills. A strong muscle can close the two halves of the shell together.

Anomopoda, Ctenopoda, Onychopoda, and Haplopoda (once Cladocera)

These four orders make up a group of small crustaceans commonly called water fleas. Around 620 species have been recognised so far, with many more undescribed. They are ubiquitous in inland aquatic habitats, but rare in the oceans. Most are long, with a down-turned head, and a carapace covering the apparently unsegmented thorax and abdomen. There is a single median compound eye. Most species show cyclical parthenogenesis, where asexual reproduction is occasionally supplemented by sexual reproduction, which produces resting eggs that allow the species to survive harsh conditions and disperse to distant habitats.

Evolution

The fossil record of branchiopods extends back at least into the Upper Cambrian and possibly further. The group is thought to be monophyletic, with the Anostraca having been the first group to branch off. It is thought that the group evolved in the seas, but was forced into temporary pools and hypersaline lakes by the evolution of bony fishes. Although they were previously considered the sister group to the remaining crustaceans, it is now widely accepted that crustaceans form a paraphyletic group, and Branchiopoda are thought to be sister to a clade comprising Xenocarida (Remipedia and Cephalocarida) and Hexapoda (insects and their relatives).

See also

*''Vladicaris''

References

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Arthropod classes
Extant Cambrian first appearances
Taxa named by Pierre André Latreille