actinopterygian love

actinopterygian

Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Any of the ray-finned fish of the subclass Actinopterygii
  • adjective Of or pertaining to these fish

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From New Latin Actinopterygiī, class name : actino– + Greek pterugion, fin, diminutive of pterux, pterug-, wing; see pterygoid.]

Examples

  • In the research described above, the old hypothesis was that the HoxD expression pattern controlling development of tetrapod limbs was an evolutionary novelty, and the HoxD expression pattern controlling actinopterygian fins was conserved.

    Ancestral Expression Patterns

  • The new model is that the tetrapod pattern is conserved and the actinopterygian pattern is novel.

    Ancestral Expression Patterns

  • The paper, "An autopodial-like pattern of Hox expression in the fins of a basal actinopterygian fish," shows that the genetic and developmental toolkit that builds limbs with fingers and toes was around long before the acquisition of limbs, according to the scientists, and that this toolkit exists in some primitive form in a living primitive bony fish, the paddlefish.

    Ancestral Expression Patterns

  • The paper, "An autopodial-like pattern of Hox expression in the fins of a basal actinopterygian fish," shows that the genetic and developmental toolkit that builds limbs with fingers and toes was around long before the acquisition of limbs, according to the scientists, and that this toolkit exists in some primitive form in a living primitive bony fish, the paddlefish.

    Ancestral Expression Patterns

  • The HoxD expression pattern in the fins of most modern actinopterygian fish is the evolutionary novelty.

    Ancestral Expression Patterns

  • The paired fins of actinopterygian fish and the limbs of tetrapods are homologous structures.

    Ancestral Expression Patterns

  • It was known that the developing fins of modern actinopterygian fish lack a developmental hallmark of developing tetrapod limbs (late phase HoxD expression).

    Ancestral Expression Patterns

  • So, if the tetrapod-like expression pattern of HoxD in Polyodon is consistent with front loading, then logically, the actinopterygian-like pattern of HoxA must be inconsistent with front loading, right?

    Ancestral Expression Patterns

  • Since actinopterygian fins are morphologically more similar to the fins of the common ancestor, it was a reasonable hypothesis that the development of limbs was the evolutionary novelty and the development of fins was evolutionarily conserved.

    Ancestral Expression Patterns

  • If one focuses on actinopterygian fins, then it looks more like a case for evolution of novel genetic mechanisms.

    Ancestral Expression Patterns

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