Peracarida
The superorder Peracarida is a large group of malacostracan crustaceans, having members in marine, freshwater, and terrestrial habitats. They are chiefly defined by the presence of a marsupium (the "brood pouch"), formed from thin flattened plates (oostegites) borne on the basalmost segments of the legs.
Species
peracarids
Superorder
- PhylumArthropoda
- ClassMalacostraca
Habitatmarine, brackish, freshwater
囊蝦總目（學名Peracarida）是甲殼類下的一個大群，包含了海洋、淡水及陸生的物種。它們的特徵是只有單一對顎足，成蟲在臼齒及門齒之間有一個以關節連接的動顎葉。甲殼較為細小，且不會後胸的體節融合。除了溫步目外，其下所有目的節肢最底部都有一個扁平的抱卵，用來包裹腹部的育幼袋。在後仔蝦期或前幼蝦期孵化的幼體會缺乏最後一對腳。 囊蝦總目的大顎片：臼齒突；刺毛；動顎葉；門齒突；及觸鬚
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Article
6 sectionsContents
- Orders
- Description
- Marsupium
- Manca
- References
- External links
The superorder Peracarida is a large group of malacostracan crustaceans, having members in marine, freshwater, and terrestrial habitats. They are chiefly defined by the presence of a marsupium (the "brood pouch"), formed from thin flattened plates (oostegites) borne on the basalmost segments of the legs.
Peracarida is one of the largest crustacean taxa and includes about 12,000 species. Most members are less than in length, but the largest can be quite sizeable, such as the giant isopod Bathynomus giganteus which can reach in length, and the giant amphipod Alicella gigantea ( long). The earliest known peracaridian was Oxyuropoda ligioides, a fossil taxon dated to the Late Devonian of Ireland (more than 360 mya).