Lamprey Lab Flashcards
What fins are not present in lamprey?
Pectoral and pelvic
With hagfishes (Mxyninoidea), what group are lamprey (Petromyzontoidea) part of?
Cyclostomata
How many species of lamprey?
~50
Where does Petromyzon marinus live?
Native to the Atlantic Ocean, but invasive species in the Great Lakes
Do lamprey have scales?
No, but it is covered in mucus
What kind of tail do lamprey have?
Diphycercal
Which lamprey sex has an anal fin?
Females
Which lamprey sex has copulatory papillae?
Males
What are lamprey teeth made of?
Keratin
What sense organs do lamprey have (4)?
- One central naris
- Pineal organ for photoreception
- Well-developed lateral eyes
- Lateral line system
What fins do lamprey have?
Anterior and posterior dorsal fins, caudal fin
What kind of skeleton do lamprey have?
Cartilaginous
What do lamprey have instead of true vertebrae?
Arcualia, which are cartilaginous structures dorsal to the notochord and embedded in connective tissue
What does the lamprey use for respiration?
Seven gill pouches separated from each other by a septum but all connected to the respiratory tube
How many gill pouches does a lamprey have?
Seven
How many chambers in the lamprey’s heart?
Three
Blood from the body enters the __.
sinus venosus
The blood moves from the atrium to the ventricle, and is pumped into the __ on to the __.
conus arteriosus, ventral aorta
How many pairs of afferent branchial arteries take blood from the lamprey’s heart to the gills ?
eight
How do lamprey feed?
They latch on to their prey with a sucker-like mouth and rasp away at the host’s tissues with their tongue.
Do all lamprey eat tissue?
No, some species eat liquid, some eat flesh, it depends on what their tongue is like
How does the lamprey eat and breathe at the same time?
It has a subdivided pharynx. The ventral part forms a respiratory tube that is separated from the mouth by a valve called the velum.
Lamprey have a __ liver.
Biolobed
Does the lamprey have a gall bladder?
No
