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Luidia sarsii is a species of starfish.Sand colored with a velvety texture, the species expresses pentamerism or pentaradial symmetry as adults. The five gently tapering arms have conspicuous bands of long white marginal spines in groups of three.
Most species in this order have five arms and two rows of tube feet with suckers. There are conspicuous marginal plates on the arms and disc. Some species have paxillae and in some, the main pedicellariae are clamp-like and recessed into the skeletal plates. [110] This group includes the cushion stars, [113] the leather star [114] and the sea ...
As different species of starfish breed at different times of year, Orchitophrya stellarum may move from one species to another in accordance with their reproductive cycles. In the Pacific Ocean, it may alternate between parasitising Evasterias troschelii and Pisaster ochraceus during the spring and summer and Leptasterias spp. in the winter.
The unusual animals have unique body plans arranged in five equal sections that differ greatly from the symmetric head-to-tail bodies of bilateral animals, which have left and right sides ...
A gynandromorph can have bilateral symmetry—one side female and one side male. [24] Alternatively, the distribution of male and female tissue can be more haphazard. Bilateral gynandromorphy arises very early in development, typically when the organism has between 8 and 64 cells. [25] Later stages produce a more random pattern. [citation needed]
Additionally, female barn swallows, a species where adults have long tail streamers, prefer to mate with males that have the most symmetrical tails. [26] While symmetry is known to be under selection, the evolutionary history of different types of symmetry in animals is an area of extensive debate.
A species of pufferfish and two triggerfish have been observed to feed on crown-of-thorns starfish in the Red Sea, and although they may have some effect on the A. planci population, no evidence exists of systematic predation. [37] In the Indo-Pacific waters, white-spotted puffers, and Titan triggerfish have also been found to eat this starfish ...
The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa.Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the classes Asteroidea (the starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved), and Stenuroidea ...