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Luidia
''Luidia'' is a genus of starfish in the family Luidiidae (Sladen, 1889) in which it is the only genus. Species of the family have a cosmopolitan distribution.〔(Classification of Genus: ''Luidia'' ) Global Biodiversity Information Facility. Retrieved 2011-08-29.〕
==Characteristics==
Members of the genus are characterised by having long arms with pointed tips fringed with spines.〔(''Luidia'' ) Encyclopædia Britannica Online. Retrieved 2011-08-29.〕 The upper surface is covered with paxillae, pillar-like spines with flattened summits covered with minute spinules. The upper marginal plates are replaced by paxillae, but the lower marginal plates are large and covered with paxillae. The tube feet do not have suckers, but have two swollen regions. There is a mouth, oesophagus, and cardiac stomach, but no pyloric stomach or anus. The gonads are underneath the sides of each arm.〔(Family Luidiidae ) Marine Species Identification Portal. Retrieved 2011-08-29.〕
The early larval stages of starfish are known as bipinnaria larvae, and members of this genus do not continue their development after this stage into a brachiolar stage before undergoing metamorphosis. However, they are capable of larval cloning, with asexual reproduction taking place while they are larvae. This has been shown to take place both in the field and in laboratory cultures and has been studied by molecular analysis of sequences of mitochondrial tRNA to identify the taxa involved.〔(Identification of Asteroid Genera With Species Capable of Larval Cloning ) Retrieved 2011-08-29.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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