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Syncarida is a superorder of crustaceans, comprising the two extant orders Anaspidacea and Bathynellacea, [1] [2] and the extinct order Palaeocaridacea. [3] Taxonomy
Anaspidacea is an order of crustaceans, comprising eleven genera in four families. Species in the family Anaspidesidae vary from being strict stygobionts (only living underground) to species living in lakes, streams and moorland pools, and are found only in Tasmania . [ 1 ]
This pair is generally uniramous, but is biramous in crabs and lobsters and remipedes. The pair attached to the second segment are called secondary antennae or simply antennae . The second antennae are plesiomorphically biramous, but many species later evolved uniramous pairs. [ 2 ]
Crustacean appendages are typically biramous, meaning they are divided into two parts; this includes the second pair of antennae, but not the first, which is usually uniramous, the exception being in the Class Malacostraca where the antennules may be generally biramous or even triramous.
Anaspides driesseni, modern member of family Anaspidesidae. The lack of a carapace and morphology of abdominal segment suggests that Koonaspides is a member of Syncarida, with its stalked eyes, pleopod morphology and general morphological similarities with Anaspidites suggesting that it is a member of Anaspidesidae, [1] [2] the family previously called as Anaspididae. [3]
Anaspididae is a family of freshwater crustacean that is endemic to Tasmania, Australia. [1] The family contains 3 living genera.This group of crustaceans are considered living fossils. [1]
At the end of the pleon is the tail fan, comprising a pair of biramous uropods and the telson, which bears the anus. Together, they are used for steering while swimming, and in the caridoid escape reaction. In crabs and some other carcinised decapods, the abdomen is folded under the cephalothorax.
Eucrenonaspides is in the order Anaspidacea. [2] It was described from a spring at 9 Payton Place, Devonport, Tasmania in 1980, making it "the first spring-dwelling syncarid recorded from the Australian region". It is listed as a vulnerable species on the IUCN Red List. A further undescribed species is known from south-western Tasmania. [3]