Karleskint G, Richard Turner R and, James Small J Introduction to Marine Biology Cengage Learning, edition four, page 445. Erwin, Douglas; Valentine, James; Jablonski, David . “Recent fossil finds and new insights into animal development are providing fresh views on the riddle of the explosion of animals during the Early Cambrian”. The lancelet, a small translucent fish-like Cephalochordate, is the closest living invertebrate relative of the vertebrates. Aside from the hard-to-classify Arkarua (a Precambrian animal with echinoderm-like pentamerous radial symmetry), the first definitive members of the phylum appeared close to the beginning of the Cambrian.
taste organs are small hairs containing gustatory neurons. These style hairs aren’t confined to 1 particular organ, however are found on many components of the invertebrate physique, including mouth, antennae, legs, feet, and ovipositor. Just like vertebrate taste receptors, invertebrate style receptors are narrowly tuned to detect specific forms of chemicals, corresponding to sugars, salts, … Read MoreRead More »