Flashcards in Lecture 16-Chordates I Deck (75):
1st characteristic exhibited by all chordates:
2nd characteristic exhibited by all chordates:
Dorsal hollow nerve cord
3rd characteristic exhibited by all chordates:
4th characteristic exhibited by all chordates:
Muscular post-anal tail
Longitudinal flexible rod of fluid filled cells.
Located between the digestive tract and nerve cord.
Provides skeletal support in higher vertebrates.
Develops in CNS. Ventral located in other animals (e.g. Arthropods).
Dorsal hollow nerve chord
Allow water to pass through mouth without entering digestive tract.
Involved in filter feeding and respiration (as gills).
Allows for propulsion.
Muscular post-anal tail
All chordates exhibit all 4 characteristics at some point during development, but may not be present in the __________ __________.
__________, __________, and __________ are all Gnathostomes.
Chondrichthyes, Osteichthyans, and Tetrapoda
__________ exhibit all four characteristics as an adult.
Lancelets are _____-like, but are not _____.
In lancelets, pharyngeal slits are used for filter feeding; __________ aid in this process.
__________ produce mucus to trap suspended particles.
Do lancelets have a respiratory system?
Lancelets exchange gas through their __________.
Lancelets have __________ circulatory systems.
Lancelets do NOT have a __________ or __________, and rarely have __________ cells.
Heart, hemoglobin, blood
_________ have mobile larvae morphologically similar to the lancelet.
During adult metamorphosis, tunicates lose _____ of 4 chordate characteristics and become __________.
The adult stage of the tunicate is a __________ __________ __________ (using mucus to trap food).
Sessile filter feeder
Do tunicates have circulatory systems?
In tunicates __________ __________ perform some gas exchange.
Chordates with heads.
__________, __________, and __________ are all subgroups of chordates.
Craniates, vertebrates, and Gnathostomes
__________ are craniates.
Hagfish have a __________ skull.
Hagfish lack __________ and __________.
Jaws and vertebrae
Hagfish produce __________ as an anti-predator defense.
Chordates with vertebrae.
__________ are vertebrate chordates.
Lampreys have a __________ vertebral column (not calcified).
A lamprey's cartilaginous vertebral column is not __________.
Lampreys lack __________.
__________ lampreys filter feed using mucus (like lancelets).
Most __________ lampreys do not feed; some are parasitic and suck blood.
Chordates with jaws and vertebrae.
In gnathostomes, we now see the evolution of __________, __________ __________, and __________ ___________.
Jaws, paired fins, acquired immunity
__________ evolve from skeletal rods supporting gill slits.
Chondrichthyes consist of:
Sharks and rays
Condrichthyes have __________ skeletons with some __________.
Chondrichthyes are __________.
Osteichthyans consist of:
In Osteichthyans, we see the evolution of __________ __________.
The two groups of Osteichthyans are:
Ray-fin fish and Lobe-fin fish
Ray-fin fish have __________ lungs.
These fish have swim bladders.
Sharks and rays are __________ flattened (dorso).
Ray-fin fish are __________ flattened.
The most diverse of fish.
In lobe-fin fish, we see the evolution of fins with __________ __________ bones supporting __________.
2,types of lobe-fin fish are:
Coelacanth and lung fish
Coelacanth are thought to have been extinct for how long?
__________ __________ have gills.
Lung fish survive terrestrial desiccation via in the mud using a __________ __________.
In __________, we see the evolution of legs from lobe-finned lung fish.
The Tiktaalik fossil posses both __________ and __________ characteristics.
Tetrapod and fish
In the Tiktaalik fossil (Tetrapoda), we see fins with __________.
In the Tiktaalik fossil (Tetrapoda), we see the evolution of a __________.
In the Tiktaalik fossil (Tetrapoda), we see expanded __________.
In the Tiktaalik fossil (Tetrapoda), we see __________ heads.
The Tiktaalik fossil (Tetrapoda) are likely to have lived in __________ __________.
There are 9 Important evolutionary adaptations in the chordates. Which is the 1st?
1. The evolution of the 4 chordate characteristics
There are 9 Important evolutionary adaptations in the chordates. Which is the 2nd?
There are 9 Important evolutionary adaptations in the chordates. Which is the 3rd?
There are 9 Important evolutionary adaptations in the chordates. Which is the 4th?
Jaws, mineralized skeleton, paired fins
There are 9 Important evolutionary adaptations in the chordates. Which is the 5th?
There are 9 Important evolutionary adaptations in the chordates. Which is the 6th?
There are 9 Important evolutionary adaptations in the chordates. Which is the 7th?
There are 9 Important evolutionary adaptations in the chordates. Which is the 8th?