Term
Phylum Chordata Synapomorphies
(5) |
|
Definition
- Pharyngeal gill slits
- Endostyle
- Notochord
- Dorsal hollow nerve cord
- Muscular post-anal tail |
|
|
Term
Subphylums of Chordates
(3) |
|
Definition
- Subphylum Urochordata
- Subphylum Cephalochordata
- Subphylum Craniata |
|
|
Term
|
Definition
- Tunicates or sea squirts
- Solitary or colonial (Sea Pork)
- Chordate features only in larval stage |
|
|
Term
Subphylum Cephalochordata Synapomorphies
(2) |
|
Definition
- Notochord runs to tip of head
- Retain larval features in adults |
|
|
Term
|
Definition
- Hagfish and all vertebrates
- Larval features retained and modified
- Defined head w/ sensory organs
- Form vertebrate around notochord and DHNC |
|
|
Term
Subphylum Craniata Synapomorphies
(5) |
|
Definition
- Neural crest
- Neurogenic placodes
- Braincase
- Complex sense organs
- Cranial nerves |
|
|
Term
|
Definition
- Ectodermal
- Cells migrate from top of neural folds
- Forms cranium, parts of sense organs and sensory system in head and more |
|
|
Term
|
Definition
- Ectodermal thickenings
- Form sense organs and nerves |
|
|
Term
|
Definition
- Craniates evolved via paedomorphosis
- Retention of juvenile characteristics in adult
- Ancestral craniate free swimming and filter feeder
- Larval lamprey (Ammocoete) are almost identical to amphioxus
- Ammocoetes as "model" craniates |
|
|
