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Chordate Zoology > Lab - Lower chordates and Agnathans > Flashcards

Lab - Lower chordates and Agnathans Flashcards

1
Q

What chordate characteristics do hemichordates dislay?

A

Gill slits

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2
Q

Name the structures labelled 1-6

A
  1. Proboscis
  2. Collar
  3. Pharyngeal gill slits
  4. Genital fold
  5. Trunk
  6. Hepatic Cecae
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3
Q

Name the structures labelled 1 and 2

A
  1. Glomerulus
  2. Stomochord
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4
Q

Describe the tunicate larva, including a detailed description of its chordate characteristics

A

The tunicate larva has a long post-anal tail, a notochord and a dorsal nerve cord that terminates at an eyespot located anteriorly (used for finding a place to settle and metamorphose). The pharynx exists as well as incurrent and excurrent siphons, but the larva does not feed. After about five days it uses adhesive suckers to stick to a surface (usually a rock) and there it stays forever.

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5
Q

What chordates characteristics do urochordates display?

A

Larval urochordates display all five characteristics and the adults display an endostyle and gill slits

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6
Q

The area where the mucous strands are collected and food is stored in the tunicate is called the ______

A

Dorsal lamina

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7
Q

Describe reproduction in adult tunicates

A

Adult tunicates have two gonads on either side of their pharynx, and often are hermaphroditic. Some can fertilize themselves, and some can also produce asexual buds

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8
Q

List the structures labelled 1-8

A
  1. Incurrent syphon
  2. Excurrent syphon
  3. Pharynx
  4. Anus
  5. Gonad
  6. Intestine
  7. Stomach
  8. Endostyle
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9
Q

What chordates characteristics do cephalochordates display and why are they significant?

A

All of them. They are significant because they look the most like present chordatesand vertebrates their entire lives but in fact, urochordates are the sister group to vertebrates

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10
Q

List the vertebrate features and unique features of cephalochordates

A

Vertebrate:
Myomeres, subpharyngeal gland, closed circulatory system, and a filter feeding system similar to lamprey, fins
Unique:
Extreme extension of notochord (extends through whole body), the atrium

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11
Q

Describe feeding in cephalochordates

A

Water enters the pharynx via a cilia-generated current. Food is trapped on mucous strands while water passes through the gill slits into the atrium then out the atriopore

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12
Q

Name the parts labelled 1-6

A
  1. Rostrum
  2. Oral cirri
  3. Oral hood
  4. Myomeres
  5. Gonad
  6. Myoseptum
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13
Q

Name the parts labelled 1-10

A
  1. Velar tentacles
  2. Velum
  3. Pharyngeal gill bar
  4. Dorsal fin
  5. Midgut caecum
  6. Notochord
  7. Esophagus
  8. Atriopore
  9. Ventral fin
  10. Wheel organ
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14
Q

Name the structures labelled1-9. What organism is this? At what part of the organism is this cross section taken?

A
  1. Dorsal fin ray
  2. Nerve cord
  3. Notochord
  4. Epipharyngeal groove
  5. Phraynx -gillbar
  6. Midgut caecum
  7. Gonad
  8. Endostyle
  9. Metapleural fold
    Amphioxus, taken from the pharynx
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15
Q

The lamprey’s caudal fin is of the _____ type

A

Diphycercal

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16
Q

How many external gill slits do lamprey have?

A

Seven

17
Q

Name the structures labelled 1-3

A
  1. Tongue
  2. Buccal cirri/buccal funnel
  3. Horny Teeth
18
Q

Name the structures labelled 1-8

A
  1. Lingual muscle
  2. Olfactory sac
  3. Pineal eye
  4. Annular cartilage
  5. Lingual cartilage
  6. Nasopharyngeal pouch
  7. Pharynx
  8. Notochord
19
Q

Name the structures labelled 1-5

A
  1. Chondrocranium
  2. Arcualia
  3. Notochord
  4. Branchial basket
  5. Lingual Cartilage
20
Q

Name the structures labelled 1-5.
What organism is this cross-section from?

A
  1. Myomeres
  2. Posterior Cardinal vein
  3. Dorsal aorta
  4. Opistonephros
  5. Liver
    From the area of the kidneys/liver
21
Q

Name the structures labelled 1-7. What organism is this taken from? What part?

A
  1. Dorsal aorta
  2. Anterior Cardinal vein
  3. Esophagus
  4. Gill Lamellae
  5. Gill pouch
  6. Ventral aorta
  7. Inferior jugular vein
    Lamprey. Pharynx.
22
Q

Describe the buccal funnel of the lamprey

A

The funnel is supported by a ring of cartilage called the annular ring. The interior has many rows of horny teeth and a fringed margin of buccal papillae. The buccal funnel produces a large amount of suction. There is a protrusible tongue that assists in ripping scales off of fish

23
Q

The tongue of the lamprey is supported by a large ______ cartilage and is moved by ______ muscle

A

lingual, lingual

24
Q

What structures do lamprey have that are thought to be homologous to vertebral arches?

A

Arcualia, small cartilaginous pieces extending dorsally from the notochord

25
Q

WHAT THE FUCK IS THIS SHITFBJASDLBASJL

A

A - nerve cord
B - notochord
C - Esophagus
D - Respiratory tube
E - Ventral aorta
F - lingual muscle
G - Heart

26
Q

Name this shit

A

A - Posterior cardinal vein
B - kidney
C - Gonad
D - Intestine

27
Q

Fuck, I don’t even know

A

A - Caudal artery
B - Caudal vein

Chordate Zoology (23 decks)

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