Spines were particularly common on trilobites during the latter halves of the Cambrian and Ordovician and the first half of the Devonian, coinciding with radiations of new groups of predators (respectively: arthropods and worms, cephalopods and starfish, fishes and ammonoids). Using spines for ...
Effects of 1-methyladenine on nuclear Ca2+ transients and meiosis resumption in starfish oocytes are mimicked by the nuclear injection of inositol 1,4,5-trisphosphate and cADP-ribose. Cell Calcium 22, 11–20 (1997). CAS PubMed Google Scholar Marchenko, S. M., Yarotskyy, V., Kovalenko...
The crown-of-thorns starfish ( Acanthaster planci) inhabits coral reefs, largely throughout the Indo-Pacific region. Its dorsal surface is covered with stout thorn-like spines. When handled or stepped on by humans, the spines can puncture the skin, causing an immediate painful reaction, ...