Journal Article

Morphological and functional diversity of the mandible in suckermouth armored catfishes (Siluriformes: Loricariidae)

Lujan, N.K. and Armbruster, J.W.

Record Number:
5257
Year:
2012
Journal:
Journal of Morphology
Pages:
24-39
Volume:
273
Abstract:
ABSTRACT We examined the mandibles of 377 individuals representing 25 species, 12 genera, 5 tribes, and 2 subfamilies of the Loricariidae, a species-rich radiation of detritivorous–herbivorous neotropical freshwater fishes distinguished by having a ventral oral disk and jaws specialized for surface attachment and benthic feeding. Loricariid mandibles are transversely oriented and bilaterally independent, each rotating predominantly around its long axis, although rotational axes likely vary with mandibular geometry. On each mandible, we measured three traditional and three novel morphological parameters chosen primarily for their functional relevance. Five parameters were linear distances and three of these were analogous to traditional teleost in- and out-levers for mandibular adduction. The sixth parameter was insertion area of the combined adductor mandibulae muscle (AMarea), which correlated with adductor mandibulae volume across a subset of taxa and is interpreted as being proportional to maximum force deliverable to the mandible. Multivariate analysis revealed distributions of phylogenetically diagnosed taxonomic groupings in mandibular morphospace that are consistent with an evolutionary pattern of basal niche conservatism giving rise to multiple adaptive radiations within nested clades. Correspondence between mandibular geometry and function was explored using a 3D model of spatial relationships among measured parameters, potential forces, and axes of rotation. By combining the model with known loricariid jaw kinematics, we developed explicit hypotheses for how individual parameters might relate to each other during kinesis. We hypothesize that the ratio [AMarea/tooth row length2] predicts interspecific variation in the magnitude of force entering the mandible per unit of substrate contacted during feeding. Other newly proposed metrics are hypothesized to predict variation in aspects of mandibular mechanical advantage that may be specific to Loricariidae and perhaps shared with other herbivorous and detritivorous fishes. J. Morphol. 273:24–39, 2012.  2011Wiley Periodicals, Inc. KEY WORDS: evolutionary novelty; functional morphology; jaw diversity; jaw mechanics; durophagy; model
Times Cited:
5
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