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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 ]
Compared to many other ostracoderms, such as the Heterostraci and Osteostraci, anaspids did not possess a bony shield or armor, hence their name.The anaspid head and body are instead covered in an array of small, weakly mineralized scales, with a row of massive scutes running down the back, and, at least confirmed among the birkeniids, the body was covered in rows of tile-like scales made of ...
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.
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]
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]
Syncarida is a superorder of crustaceans, comprising the two extant orders Anaspidacea and Bathynellacea, [1] [2] and the extinct order Palaeocaridacea. [3] Taxonomy
Anaspidesidae 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]
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 ]