PHYLUM CHORDATA Flashcards
The most distinguishing character that all animals belonging to this phylum have is the presence of notochord;
chordata
it is a longitudinal rod that is made of cartilage and runs between the nerve cord and the digestive tract
notocord
this is a bundle of nerve fibers which connects the brain to the muscles and other organs
dorsal nerve cord
this is an extension of the body beyond the anus
post-anal tail
openings which connect the mouth and the throat
pharyngeal slits
sometimes known as the turnicata, are commonly known as “sea squirts”;
UROCHORDATA
Known as lancelets or as amphioxus (from the Greek for “both [ends] pointed,” in reference to their shape), cephalochordates are small, eel-like, unprepossessing animals that spend much of their time buried in sand
CEPHALOCHRODATA
also called Craniata, any animal of the subphylum Vertebrata, the predominant subphylum of the phylum Chordata; hey have backbones, from which they derived their name
subphylum vertebrata
The traits that make all of the animals in this section special are their __________, __________, and __________
spinal chord, vertebrae, and notocord
the concentration of sense organs, nervous control, etc., at the anterior end of the body, forming a head and brain, both during evolution and in the course of an embryo’s development.
cephalization
gill-bearing animals found in freshwater, marine, and brackish water; dubbed as the most primitive class of Subphylum Vertebrata
superclass pisces
primitive earliest jawed fishes of Paleozoic
class placodermi
refers to jawless fishes
Agnatha
mostly marine and cartilaginous endoskeleton
chondrichthyes
freshwater and marine and marine endoskeleton
osteichthyes
characterized by their ability to exploit both terrestrial and aquatic habitats
amphibia
