27. Flashcards
1
Q
Deuterostomia includes which 3 extant phyla?
A
Echinodermata
Hemichordata
Chordata
2
Q
T/F
Deuterostome-style development was present in the ancestor of all Bilateria
Why or why not?
A
True
Some features (e.g. radial indeterminate cleavage and mouth not arising from blastopore) also occur in the clade Protostomia, which has led some to argue this
3
Q
List 2 possible morphological synapomorphies of Deuterostomia (and which phylum each has been lost in)
A
- pharyngeal slits (lost in echinodermata)
- 3-part body coelom (lost in chordata)
4
Q
The phylum Echinodermata includes which common organisms?
A
sea lilies
sea stars
brittlestars
sea urchins
sand dollars
sea cucumbers
& others
don’t need to know all these
5
Q
How many extant described species are in the phylum Echinodermata?
A
~7300
6
Q
T/F
Echinodermata are mostly terrestrial deuterostomes
A
false
entirely marine
7
Q
A
