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Starfish have no distinct excretory organs; waste ammonia is removed by diffusion through the tube feet and papulae. [22] The body fluid contains phagocytic cells called coelomocytes, which are also found within the hemal and water vascular systems. These cells engulf waste material, and eventually migrate to the tips of the papulae, where a ...
In the wild they may live up to 35 years. They weigh up to 5 kilograms (11 lb). Like other echinoderms, basket stars lack blood and achieve gas exchange via their water vascular system. The basket stars are the largest ophiuroids with Gorgonocephalus stimpsoni measuring up to 70 cm in arm length with a disk diameter of 14 cm. [4]
Patiria miniata, the bat star, sea bat, webbed star, or broad-disk star, is a species of sea star (also called a starfish) in the family Asterinidae. It typically has five arms, with the center disk of the animal being much wider than the stubby arms are in length. [2] Although the bat star usually has five arms, it sometimes has as many as ...
For sexually reproducing planaria: "the lifespan of individual planarian can be as long as 3 years, likely due to the ability of neoblasts to constantly replace aging cells". Whereas for asexually reproducing planaria: "individual animals in clonal lines of some planarian species replicating by fission have been maintained for over 15 years".
L. clathrata is found around the coastlines of the western Atlantic Ocean, from Virginia south to Brazil, the Caribbean Sea, and the Gulf of Mexico.It is usually on sandy or muddy sea beds down to a depth around 40 m (130 ft), although it is occasionally found in deeper waters down to 100 m (330 ft).
The nervous system of a starfish is shown here during an analysis. - Laurent Formery Together, the data created a 3D map to determine where genes were expressed as sea stars developed and grew.
Starfish are some of the strangest creatures of the animal kingdom—so much so that scientists didn’t even know for sure if the animals had heads.
It competes with the starfish Uniophora granifera and Coscinasterias muricata, and Pacific walruses, Odobenus rosmarus ssp. divergens, for bivalve prey. [ 4 ] A possible commensal is the bacterium Colwellia asteriadis , a new species published in 2010, which has only been isolated from Asterias amurensis hosts in the sea off Korea.