Term
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Definition
Paleozoic jawless fishes
Lampreys and hagfishes living descendants |
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Term
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Definition
"without jaws"
Lampreys and Hagfishes
Internal ossification
Scales
Paired fins |
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Term
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Definition
They ascend rivers and streams to spawn
Grow to 1 yr
Spawn in Winter or Spring and soon die |
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Term
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Definition
Petros/myzon
Stone/sucking
Invasive lampreys in Atlantic drainage's in US, Canada, and Europe
Marine/Freshwater to breed |
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Term
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Definition
Ammos/kote
Sand/bed
Young larvae live in sand for 3 to 5 years |
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Term
LAMPREYS
Ammocoetes Internal Structure
(6) |
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Definition
Two-chambered heart
Two median eyes w/ lens and receptor cells
Three-part brain
Thyroid and pituitary glands
Pronephric kidney
7 gill pairs |
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Term
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Definition
Oral papillae are attached to the roof and sides of hood
Used for filter feeding |
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Term
AMMOCOETES
Lateral Groove
(2) |
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Definition
On each side of body
Contains seven gill silits |
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Term
AMMOCOETES
Cloacal Opening
(2) |
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Definition
Anus
Anterior to caudal fin |
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Term
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Definition
Posterior to buccal cavity
Large pair of flaps that create water currents through the pharynx |
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Term
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Definition
Has 7 internal gill slits that open into gill pouches
Gill pouches open to the outside by 7 small external gill slits |
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Term
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Definition
Cartilaginous rods between the internal gill slits
Strengthen the pharynx walls |
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Term
AMMOCOETES
Gill Lamellae
(2) |
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Definition
Rich in capillaries, which the blood gives up its carbon dioxide and takes up its oxygen from water
On the pharynx walls |
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Term
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Definition
Subpharyngeal gland
In the floor of the pharynx
Length of four gill slits
Secretes mucus by a duct into the pharynx
Becomes thyroid in adult |
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Term
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Definition
Food particles brought in by water currents are trapped in the mucus and carried by ciliary action
Widens into intestine |
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Term
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Definition
| Lies under the posterior end of the esophagus |
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Term
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Definition
Embedded in the liver
Clear, round vesicle |
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Term
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Definition
Two-chambered
Lies under the forepart of the esophagus |
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Term
AMMOCOETES
Pronephric Kidney |
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Definition
Over the heart and around the esophagus
# of small tubles that empty into the cloaca by pronephric ducts |
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Term
AMMOCOETES
Dorsal Nerve Cord |
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Definition
| Enlarges anteriorly into a three-lobed brain |
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Term
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Definition
| Contains the olfactory lobe |
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Term
AMMOCOETES
Nasohypophyseal Canal
(2) |
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Definition
In front of the forebrain
Opening dorsally to the outside by a median nostril |
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Term
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Definition
Contain darkly pigmented eyes that connect with each side of the midbrain
Covered w/ skin and muscle
Have little sensitivity to light
Has photoreceptors in tail |
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Term
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Definition
Contain clear oval ear vesicles on each side
Function: hearing and equilibrium |
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Term
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Definition
| Lateral masses of muscles |
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Term
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Definition
Surrounded by the neural canal
Contains neurocoel cavity |
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Term
AMMOCOETES
Ciliated Ridges |
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Definition
| Cilia that move mucus strands w/ trapped food toward the esophagus |
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Term
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Definition
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Term
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Definition
| Oral hood encloses this cavity to the back and sides of which are attached oral papillae |
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Term
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Definition
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Term
AMMOCOETES
Dorsal Aorta
(2) |
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Definition
Ventral to notochord
Drains oxygenated arterial blood from the gills and delivers it to the head and body |
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Term
AMMOCOETES
Ventral Aorta
(3) |
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Definition
Ventral to the pharynx
Brings blood from heart to pharynx
Begins as single, then splits into two |
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Term
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Definition
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