Chapter 15 Flashcards
In both tunicates and cephalochordates, the ventral side of the pharynx contains a ciliated, mucus-secreting groove, the ______
Endostyle
True/False
Vertebrates differ from other chordates because they have a brain case
True
True/False
In vertebrates, pharyngeal gill slits are formed by inpocketing of ectoderm and outpocketing of the endoderm
True
The skeletal rod found in all chordates is called a _________
Notochord
The jawless vertebrates are called Agnatha, and the jawed vertebrates are called _________
Gnathostomes
True/False
A notochord is present at some time in the life cycle of all chordates
True
True/False
Tunicates are sessile organisms with no larval stages in their life cycle
False
Lancelets belong to the subphylum _______
Cephalochordata
The ______ were jawed fished which lived at the same time as the placoderms that may have been the ancestors of today’s bony fish
Acanthodians
During the evolution of the vertebrates, gills changed from respiratory organs to filter-feeding structures
False
The development of a _______ life style by the early vertebrates is believed to have been key in the success of this group
Predatory
