Term
| Name the order of the chordate groups in order of phylogenetic relationship |
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Definition
| Cephalochordata, Agnthans, Condricthyes, Actinoptergii, Sarrcopterygii, Lissamphibians, Parareptilia, Eureptilia, Crocodylomorpha, Aves, Synapsida |
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Term
| Describe the tree after lissamphibia |
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Definition
A branch splits between eureptilia and parareptilia. Following the Eurep, up it is followed by crocodylomorpha, and that is followed by aves
Back on the main branch it ends with synapsida |
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Term
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Definition
| change in gene frequency over generations |
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Term
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Definition
| differential survival and reproduction of individuals within' population |
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Term
| Name the origins of the 3 components of the cranium: Splanchnocranium |
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Definition
| Splanchnocranium: branchial arch which arose to support pharyngeal slits. It began to support early jaws. Eventually became the upper and lower jaw. |
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Term
| Name the three components of the cranium |
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Definition
| Splanchnocranium, Chondrocranium, Dermatocranium |
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Term
| Name the origins of the 3 components of the cranium: Chondrocranium |
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Definition
| Chondrocranium came from inner tissue. It now forms the base and back of the skull and the cartilage/bone surrounding sensory organs. |
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Term
| Name the origins of the 3 components of the cranium: Dermatocranium |
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Definition
| Dermatocranium originated from bony outer covering (dermal origin) and migrated inward to join other bones. It forms the sides, roof of the skull, bony roof of mouth, and encases the splanchnocranium. |
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Term
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Definition
| It is bone movement within the skull. For example a snake unhinging its jaw |
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Term
| Name/Describe a creature with cranial kinesis and why it has it |
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Definition
Snakes unhinge their jaws to swallow bigger prey.
Many fish use suction feeding. The bones slide back in a way that creates a low pressure pocket, sucking nearby fish/water into the mouth. (prey capture) |
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Term
| Name/Describe a creature without cranial kinesis and why it lacks it |
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Definition
| Mammals such as cows lack cranial kinesis because without it we have more chewing support. (Good for things like cows.) In other words we lack it in favor of mastication. |
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Term
| Describe the evolution of the middle ear |
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Definition
| In synapsids have a whole akinetic jaw with single dentary. The post-dentary bones evolved the new function and biological role of the middle ear bones to assist in sound transmition instead of jaw articulation. |
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Term
| Describe the function of the secondary plate |
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Definition
The branchial arches can also evolve to support the trachea. Without it our airway and esophagus are one tube, so we can't breathe while chewing.
But the secondary plate splits the front of the skull into two pathways. One for air and one for food so we can chew and breathe at the same time. |
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Term
| What are branchail arches |
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Definition
| A series of bones that support pharyngeal slits/gills |
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