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3 Cards in this Set
- Front
- Back
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What is a hyperotreti and a hyperoartia? |
A hagfish and a lamphrey |
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What is a craniate,vetebrate, gnathostomata, osteichthyes, Sarcopterygii |
Animals with a skull Animals with a backbone Veterbrates with movable jaws Bony fish Lobe-finned fish ( includes vertebrates with limbs |
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Diagnostic features of craniates |
Skull
Cranial nerves
Five part brain- brain develops from five vesicles of the neural tube ( medulla/ midbrain, cerebellum, diencephalon, pons, telencephalon )
Placodes- localised thickenings in the ectoderm in the head of a craniates embryo
Neural crest- group of embryonic ectoderm - gives rise to - sensory cells, skeletal and connective tissues, pigment containing cells , Gill arches, jaws braincase floor , formation of dermal bones ( formed through deposition of bone tissue within connective tissue) - dermal bones develop into Dermatocranium - bony fish to mammals , absent - lamphreys + hagfish + cartilagenius fish Consists of- dermal bones of (cranial roof,primary palate, upper/lower jaw) Neurocranium - occurs in all embryos of craniates- adult form= lamphreys and hagfish and cartilagenius fish Consists of- occipital,temporal,shenoid,ethmoid region lamphreys and hagfish and cartilagenius fish Consists of- occipital,temporal,shenoid,ethmoid region About shark neurocranium - single element ( basal plate) - 3pairs of capsules attached to basal plate- capsules = support +project , hearing ,sight and smell organs complex - a shared derived feature of craniates that has a function in olfaction (hagfish = larger) Splanochocranium -gill arches - similar to jaw structure of humans
Nasohypophyseal complex - a shared derived feature of craniates that has a function in olfaction (hagfish = larger) Semicircular canal- detect angular acceleration and deceleration of the head - 3 in jawed vertebrates , 2 lamphreys, 1 hagfish - filled with endolymph - motion of fluid informs brain of movemt direction Gill filaments Endoskeleton s - cartaligenous or bony Complex digestive /circulatory system Semicircular canal- detect angular acceleration and deceleration of the head - 3 in jawed vertebrates , 2 lamphreys, 1 hagfish - filled with endolymph - motion of fluid informs brain of movemt direction
Gill filaments
Endoskeleton s - cartaligenous or bony
Complex digestive /circulatory system
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