The evolutionary origin of flatfish asymmetry

  title={The evolutionary origin of flatfish asymmetry},
  author={Matt Friedman},
All adult flatfishes (Pleuronectiformes), including the gastronomically familiar plaice, sole, turbot and halibut, have highly asymmetrical skulls, with both eyes placed on one side of the head. This arrangement, one of the most extraordinary anatomical specializations among vertebrates, arises through migration of one eye during late larval development. Although the transformation of symmetrical larvae into asymmetrical juveniles is well documented, the evolutionary origins of flatfish… 

Flatfish: an asymmetric perspective on metamorphosis.

Shared ecological traits influence shape of the skeleton in flatfishes (Pleuronectiformes)

The majority of variation evolved recently, within the past 15–10-million-years in the middle Miocene, and is highly variable within the flatfishes.

Are flatfishes (Pleuronectiformes) monophyletic?

Morphological Specificity in Cultured Starry Flounder Platichthys stellatus Reared in Artificial Facility

The features of morphometric and morphological differences occur more in artificial environment during and just after metamorphosis of immature fish and juvenile fish are observed.

Osteology of †Heteronectes chaneti (Acanthomorpha, Pleuronectiformes), An Eocene Stem Flatfish, with a Discussion of Flatfish Sister-Group Relationships

It is suggested that orbital migration was among the earliest of the distinctive pleuronectiform features to arise and should be the target of future analyses to determine whether they represent symplesiomorphies, homoplasies, or derived features uniting flatfishes and latids.

Origins and relationships of the Pleuronectoidei: Molecular and morphological analysis of living and fossil taxa

A total evidence phylogeny that places fossil flatfishes among extant lineages is constructed and finds polyphyly or paraphyly of two flatfish families, the Paralichthyidae and the Rhombosoleidae, and supports the creation of two additional families to resolve their non‐monophyletic status.

Phylogenomic analysis of carangimorph fishes reveals flatfish asymmetry arose in a blink of the evolutionary eye

A phylogeny based on UCE loci that unequivocally supports flatfish monophyly and a single origin of asymmetry points to phenotypic divergence early within carangimorph history that broadly matches with the predictions of adaptive models of lineage diversification.

An early fossil remora (Echeneoidea) reveals the evolutionary assembly of the adhesion disc

The adhesion disc of †Opisthomyzon retains ancestral features found in the spiny dorsal fins of remora outgroups, and corroborates developmental interpretations of the homology of individual skeletal components of the disc, which indicates that theAdhesion disc originated in a postcranial position.

Prolonged morphological expansion of spiny-rayed fishes following the end-Cretaceous

The results indicate that several million years after the end-Cretaceous, acanthomorphs underwent a prolonged and significant expansion of morphological disparity primarily driven by changes in body elongation, and that acanthomorphic lineages containing the bulk of the living species diversity originated throughout the Cenozoic.



Asymmetrical development of bones and soft tissues during eye migration of metamorphosing Japanese flounder, Paralichthys olivaceus

The asymmetrical presence and growth of the pseudomesial bar together with inflation of the retrorbital vesicle on the blind side may be responsible for right eye migration during metamorphosis in the Japanese flounder.

Pleuronectiform relationships : a cladistic reassessment

It is concluded that phylogenetic knowledge within flatfishes remains very incomplete and the monophyletic status of speciose taxa such as the Pleuronectinae and Paralichthyidae will have to be reassessed before any fruitful statement of relationships can be formulated.

The Asymmetry, Metamorphosis and Origin of Flat-Fishes

It is now a well-known fact that every Flat-fish begins life with the eyes in the normal position; the asymmetry of its skull is not born with it, but acquired during the early development. The

Asymmetric craniofacial remodeling and lateralized behavior in larval flatfish

Flounder larval development in left-sided, right-sided and bilaterally symmetric variants of southern flounder shows that behavior and skull asymmetries precede metamorphosis, and the development of lateralized behaviors was independent of eye position in larvae treated with thyroid hormone and in symmetrical variants.

Descriptions of larval flatfishes of the genera Psettodes (Psettodidae) and Pseudorhombus (Paralichthyidae) from the Great Barrier Reef, Australia

The larval developmental stages of five of the eight species of Psettodes and Pseudorhombus known from the shelf waters of the central Great Barrier Reef are described and illustrated. The species

The Perciform Caudal Skeleton

The material on which the present paper is based falls into two categories; the first consists of a series of alizarian-stained specimens dissected especially in connection with the present work, and the second consists of specimens in the skeleton collection of the University of Hawaii.

Percomorph phylogeny: a survey of acanthomorphs and a new proposal

The interrelationships of acanthomorph fishes are reviewed and recommend extending the Percomorpha to include the Atherinomorpha (and other smegmamorphs), and argue that this larger group is monophyletic, although this survey does not cover Tetraodontiformes.

Development of the bony skull in common sole: brief survey of morpho‐functional aspects of ossification sequence

The postembryonic development of the bony cephalic skeleton in the common sole Solea solea, observed from hatching to the juvenile stage or postmetamorphic larva, appears to follow a similar

From symmetry to asymmetry: phylogenetic patterns of asymmetry variation in animals and their evolutionary significance.

  • A. R. Palmer
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 1996
The phylogenetic transition from antisymmetry to directional asymmetry suggests that many cases of laterally fixed asymmetries evolved via genetic assimilation, and the ontogenetic origin of asymmetry significantly influences its subsequent evolution.

A cladistic reassessment of octopodid classification

This analysis examines methods that have contributed to octopodid classifications from a cladistic perspective that emphasizes the recognition of monophyletic groups, and applies parsimony algorithms to the data set reported by Voss (1988a) for the Octopodidae.