Blog

In amphioxus, the ___ organ inside the oral hood is covered in cilia. Beating of these cilia produces a vortex of water inside the hood.

Of the four extraembryonic membranes of reptiles, birds, and mammals, the ___ surrounds the embryo in its own “private pond.”

Unlike gars, most modern bony fish have a ___ swim bladder. In this kind of swim bladder, the organ is not connected to the digestive tract by a pneumatic duct.

Clamworms and other polychaetes have flap-like appendages called ___. These appendages are uses for locomotion and gas exchange. 

On a dark and stormy night, two earthworms meet outside their burrows. Sperm leaves the male pore of one worm before traveling down the seminal ___to the seminal receptacles of the other worm.

Amphioxus (lancelets) belong to subphylum ___. 

How do beardworms feed themselves?

___ is a synapomorphy of the gnathostomes. (This synapomorphy is an “advance” that gnathostomes made over other animals. The ancestor of all gnathostomes had it, but not primitive chordates. In the PowerPoints, you saw these characters mapped on phylogenies)

Baby kangaroos spend much of their time inside the ____ (=pouch) of their mother. 

Tuataras only occur on the islands of ___.