Agnatha Flashcards
The notochord functions primarily for
structural support
What is a long flexible rod fluid-filled cells encased in stiff, fibrous tissue
A. dorsal nerve chord
B. notochord
C. Pharyngeal slits
D. Post Anal Tail
b notochord
Hollow dorsal nerve cord:
A. largely reduced in adults
B. develops into the CNS, brain and spinal chord
C. flexible rod with stiff, fibrous tissue
D. swimming in species retain it
b
Series of pouches separated by grooves on sides of pharynx describes?
pharyengeal slits
____ develops into ear, neck, and other modified structures
pharengyeal slits
Hemichordates are:
A. carnivorous only
B. ominvourous
C. deposit feeders and detritus feeders
D. adults dont feed
c deposit feeders
Which characteristics do hemichordates share with chordates?
A. Pharyngeal gill slits
B. notochord
C. Post-anal tail
D. Hollow neural tube
A C D not B (notochord)
Hemichordates have a foregut pouch instead of a
A. Pharyngeal gill slits
B. notochord
C. Post-anal tail
D. Hollow neural tube
B notochord
Which group has a stomochord (foregut pouch)
The 3 body segments prosome, mesosome, metasome belong to which group?
hemichordates
What are the 3 body segments in a hemichordate?
A. anterior prosome, intermediate mesosome, posterior metasome
B. posterior prosome, intermediate mesosome, anterior metasome
C. intermediate prosome, intermediate mesosome, anterior metasome
D. anterior statochord, intermediate mesosome, posterior metasome
A. anterior prosome, intermediate mesosome, posterior metasome
Which are the 3 sub phyla of Chordates?
A. urochordates
B. vertebrates
C. cephalochordates
D. hemichordates
a b c
Which characteristics describes Urochordates:
A. sessile in adulthood
B. lack segmentation, notochord and nerve chord
C. use cilia lined pharnyx to trap food in muscous sheets
D. Secrete a tough tunic of cellulose
All of the above
Which characteristics describes Urochordates:
A. sessile in adulthood
B. lack segmentation, notochord and nerve chord
C. use cilia lined pharnyx to trap food in muscous sheets
D. Secrete a tough tunic of cellulose
All of the above
Which chordate phyla has an endostyle
urochordates
Adult urochordates are missing:
A. body cavity
B. segmentation
C. notochord
D. dorsal nerve chord
all of the above
Which chordate larvae doesnt has a poorly developed gut and does not feed?
urochordates
Which characteristics describes cephalochordates?
A. notochord in adulthood
B. myomeres
C. Has a cilia line the oral hood, pharynx and gill slits
D. adults don’t feed
A, B C
Lancelets are scaleless, true or false?
true
Lancelts and tunicates are vertebrates. True or false?
False - chordates
In which chordate sub phyla does the Endostyle develops into thyroid gland?
vertebrates
Vertebrates developed a new embryonic tissues called a ____ which gives rise to sensory and head structures
: neural crest
Garstang’s (1928) hypothesis states:
A. Free swimming urochordate larva failed to metamorphose but developed adult features in larval stage
B. result from highly ancestoral larvae
C. are a sister group to cephalochordates
D. Retain primitive pattern of pre-vertebrate
condition
Paedomorphosis is:
A, origin of vertebrates theory
B. disproves earliest vertebrate fossils including jawless ostracoderm fishes
C. The evolutionary process in which larval or juvenile features of an ancestral organism are displaced to the adult forms of its descendants.
D. Linked to the cephalochordate ancestral theory
C.
Agnatha are _______ to extinct ostraoderms:
A. paraphyletic
B. monophelythic
C. polyphletyic
D. panophyletic
A. paraphleythic
Agnatha characteristics:
A. Have no stomach
B. single atrium and single ventricle
C. Dorsal nerve cord with a differentiated brain
D. Have a notochord and dorsal nerve chord
All of the above
Which vertebrate group has fins but no paired appendages?
A. Tunicates
B. Lancelets
C. Agnatha
D. Urochordates
C agantha
Which group of vertebrates has a single atrium and single ventricle?
agantha
Class Myxini and ___ belong to superclass Agnatha
Hyperoartia
Myxini has a complete skeleton. True or False?
false
Which vertebrate group attaches to food with toothed plates; use a rasping tongue?
agnatha
Cartilaginous skull, but no vertebral column, but do have rudimentary vertebrae describes which class?
Myxini
Class Hyperoartia are:
A. parasitic
B. have ammoceote larave
C. metamorphis
D. anadromous
All of the above
ammocoetes larvae belongs to?
Class hyperoartia
anadromous means?
birthed in freshwater and live adult life in marine environments
Which agnatha class has complete cartilaginous skeleton?
Lampreys
