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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

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CLADOGRAM VERSATILITY: EVOLUTION AND BIOGEOGRAPHY OF ACANTHUROID FISHES.

Richard Winterbottom^1,2, Deborah A McLennan^1,2

¹Department of Ichthyology and Herpetology, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, M5S 2C6, Canada.

Evolution; International Journal of Organic Evolution

|June 1, 2017

Summary

This study uses a fish cladogram to reveal evolutionary events in acanthuroids. Key findings include their ancient origins, Indo-West Pacific ancestry, and dispersal linked to geological changes.

Keywords:

Acanthuroid fishes adaptation biogeography evolutionary processes phylogeny

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Area of Science:

Ichthyology
Evolutionary Biology
Biogeography

Background:

Acanthuroid fishes represent a diverse group with complex evolutionary histories.
Understanding their evolutionary pathways requires robust phylogenetic frameworks.

Purpose of the Study:

To utilize a cladogram of acanthuroid fishes to investigate biogeographic and microevolutionary events.
To generate adaptational hypotheses and frame future research questions.

Main Methods:

Construction and analysis of a highly corroborated cladogram of acanthuroid fishes.
Biogeographic analysis using cladograms and optimization of current distributions.
Investigation of evolutionary trends in predorsal bone and pelvic fin morphology.

Main Results:

Basal cladogenesis of acanthuroids predates the Eocene (50-55 mya).
Ancestral distributions for Acanthurinae, Acanthuridae, and Acanthuroidei were Indo-West Pacific.
Dispersal events may be linked to Tethys closure (ca 20 mya) or Pacific colonization of the Atlantic/Caribbean.

Conclusions:

Cladograms are powerful tools for generating evolutionary hypotheses in fishes.
Acanthuroid evolution involved significant biogeographic shifts and adaptive radiations.
Further research can explore dietary plasticity, fossil evidence, and morphological diversification.