Heterochrony in fringeheads (Neoclinus) and amplification of an extraordinary aggressive display in the Sarcastic Fringehead (Teleostei: Blenniiformes)

TitleHeterochrony in fringeheads (Neoclinus) and amplification of an extraordinary aggressive display in the Sarcastic Fringehead (Teleostei: Blenniiformes)
Publication TypeJournal Article
Year of Publication2018
AuthorsHongjamrassilp W., Summers A.P, Hastings PA
JournalJournal of Morphology
Volume279
Pagination626-635
Date Published2018/05
Type of ArticleArticle
ISBN Number0362-2525
Accession NumberWOS:000430060200006
KeywordsAnatomy & Morphology; Blennioidei; CT scan; evolution; fishes; gaping; japan; morphological evolution; phylogenetic analysis; signal; territorial defense; visual; weapon performance
Abstract

The Sarcastic Fringehead (Neoclinus blanchardi, Teleostei) exhibits an extreme version of a common aggressive display, the gaping display, in which an open mouth is presented toward an opponent. Males of this species have extremely long jaws that extend posteriorly well past the posterior margin of the head and are flared laterally during the gaping display. In this study, we explored morphological traits related to this extraordinary display in this and related species of blennies. Morphological modifications include enlargement of the buccopalatal membrane, elongation of the maxilla via an uncalcified posterior extension, and evolution of a novel hinge between the anterior maxilla and lacrimal bones permitting lateral movement of the upper jaw. Geometric morphometry using the truss network system, thin-plate spline, and PCA of three closely related species of Neoclinus indicate that the elongate maxilla of N. blanchardi most likely evolved via acceleration (faster growth compared to outgroups) and hypermorphosis (continued growth to a larger body size), both forms of peramorphic heterochrony. Coloration and fluorescence of the buccopalatal membrane may also serve to amplify the extraordinary gaping display of the Sarcastic Fringehead.

DOI10.1002/jmor.20798
Short TitleJ. Morphol.
Student Publication: 
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