Sarcopterygii

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The two main clades of Osteichthyes are Actinopterygii and Elasmobranchii.

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Actinopterygii are ( ray-finned, lobe-finned ) fishes, and Sarcopterygii are ( ray-finned, lobe-finned ) fishes.

1

Which of these are traits of Osteichthyes?

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In Osteichthyes, asymmetrical fin skeleton is an ancestral trait.

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Early forms of Osteichthyes had ( thick, thin ) scales, while modern Osteichthyes have ( thick, thin ) scales

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Actinopterygian scales: ❌ (❌)
Sarcopterygian scales: ❌ (❌)

enamel

ganoine

dentine-like layer

cosmine

1

Compare the Skulls of the following:

❌: complete dermal skull roof and no mobility of upper jaw

❌: complete dermal bone of skull

❌: reduced # dermal bones in skull, greater mobility marginal mouth bones of upper jaw, maxillae and premaxillae

basal Actinopterygian

Sarcopterygian

derived actinopterygian

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( Actinopterygian, Sarcopterygian ) brains develop by eversion, folding cerebral hemispheres ( outward, inward ).

( Sarcopterygian, Actinopterygian ) brains develop by cerebral hemispheres folding ( inward, outward ) on themselves (as in Humans)

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Early Sarcopterygii were ( cylindrical, compressiform, elongate ) and ( 20-70, 40-90, 10-50 ) cm long. They had ( two, one ) dorsal fins and a distinct upper lobe on the ( heterocercal, lunate ) caudal fin. They were most diverse during the ( Paleozoic, Mesozoic, Cenozoic ).

1

The three major lineages of Sarcopterygii are:

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Actinistia are also known as:

1

What are the two derived characters of Actinistia?

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Coelacanths (Actinistia) have a vestigial lung.

1

What are the derived characters of Dipnoi?

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Actinistia is the largest genome among vertebrates.

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Dipnoans retained paired lungs.

1

There is currently one extant species of Tetrapodomorpha fish.

1

What are the derived characters of Tetrapodomorpha?

1

Choanae are...

Biology Quiz am Sarcopterygii, erstellt von Jo O'Bar am 13/10/2018.

Sarcopterygii

The two main clades of Osteichthyes are Actinopterygii and Elasmobranchii.

Actinopterygii are ray-finned lobe-finned( ray-finned, lobe-finned ) fishes, and Sarcopterygii are ray-finned lobe-finned( ray-finned, lobe-finned ) fishes.

Which of these are traits of Osteichthyes?

In Osteichthyes, asymmetrical fin skeleton is an ancestral trait.

Early forms of Osteichthyes had thick thin( thick, thin ) scales, while modern Osteichthyes have thick thin( thick, thin ) scales

Actinopterygian scales: ❌ (❌) Sarcopterygian scales: ❌ (❌)

Compare the Skulls of the following: ❌: complete dermal skull roof and no mobility of upper jaw ❌: complete dermal bone of skull ❌: reduced # dermal bones in skull, greater mobility marginal mouth bones of upper jaw, maxillae and premaxillae

The three major lineages of Sarcopterygii are:

Actinistia are also known as:

What are the two derived characters of Actinistia?

Coelacanths (Actinistia) have a vestigial lung.

What are the derived characters of Dipnoi?

Actinistia is the largest genome among vertebrates.

Dipnoans retained paired lungs.

There is currently one extant species of Tetrapodomorpha fish.

What are the derived characters of Tetrapodomorpha?

Choanae are...

Actinopterygii are ( ray-finned, lobe-finned ) fishes, and Sarcopterygii are ( ray-finned, lobe-finned ) fishes.

Early forms of Osteichthyes had ( thick, thin ) scales, while modern Osteichthyes have ( thick, thin ) scales

Actinopterygian scales: ❌ (❌)
Sarcopterygian scales: ❌ (❌)

Compare the Skulls of the following:

❌: complete dermal skull roof and no mobility of upper jaw

❌: complete dermal bone of skull

❌: reduced # dermal bones in skull, greater mobility marginal mouth bones of upper jaw, maxillae and premaxillae