The rock-boring urchin (Echinometra lucunter) is a regular tropical echinoid
characterized by the color of the test (or shell) and spikes ranging from dark tones to black.
Larval arm movements and the musculature that animates them may be characters that are plesiomorphic to larvae of crown group echinoid
taxa (Wray, 1992) and appear to vary among their descendants.
community structure and rates of herbivory and bioerosion on exposed and sheltered reefs.
Contradictory findings regarding behavioral cues, both among and within species and locales, make it difficult to develop a generalized model of echinoid
aggregation and overgrazing.
setosum is a stenohaline echinoid
that could not be able to survive and develop if the salinity range is less than28 or more than 37 ppt.
antillarum; whereas Prado, Carmichael, Watts, Cebria & Heck, (2012) experimentally determined the trophic enrichment factor for the green echinoid
Taxonomic significance of spine morphology in the echinoid
genera Diadema and Echinothrix.
Sea urchins belong to the class Echinoidea, one of four classes in the phylum Echinodermata, and here specialists describe echinoid
species and represent them with images.
The northern limb of the syncline is accessible by vehicles along a dirt track around the western side of the jebel and has been a fruitful site for the collection of echinoid
specimens by palaeontologists of the Natural History Museum, London.
fossil in the wall of <BBurberry's on Bond Street
Biology of the Echinoid
, Tripneustesgratilla Fed the Seagrass, Halophilastipulacea in the Gulf of Aqaba, Jordan.
The non-rudist bivalves mentioned above occur together with scattered moulds of gastropods (Ampullina and Tylostoma), abundant echinoid
spines, several Diplopodia, and an isolated pycnodontid fish tooth (Coelodus).