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Miniaturization and its effects on cranial morphology in plethodontid salamanders, genus Thorius (Amphibia: Plethodontidae). I. Osteological variation

Identifieur interne : 006064 ( Istex/Checkpoint ); précédent : 006063; suivant : 006065

Miniaturization and its effects on cranial morphology in plethodontid salamanders, genus Thorius (Amphibia: Plethodontidae). I. Osteological variation

Auteurs : J. Hanken [États-Unis]

Source :

RBID : ISTEX:2AA87502023A80ED44EA7561CEB044C2A37A12A2

English descriptors

Abstract

Cranial skeletal morphology, ontogeny and variation are examined in five species of Thorius, a genus of diminutive plethodontid salamanders that are among the smallest, extant, tailed tetrapods. The skull of adull Thorius is characterized by: (1) limited development or absence of several ossified elements and dentition; (2) increased inter‐and intraspecific variability; (3) novel morphological configurations of the braincase and jaw suspensorium. Posthatching cranial mineralization in all species of Thorius is truncated precociously with respect to that typical of larger and more generalized plethodontid genera, such as Pseudoeurycea. These features implicate paedomorphosis as a predominant mechanism responsible for the evolution of decreased size in Thorius from larger plethodontid ancestors. Interspecific differences in cranial morphology are evident; species may be characterized by greater or lesser degrees of truncated development. However, there is no consistent relationship between degree of paedomorphosis and mean adult body size in interspecific comparisons. Adult morphology of several individual elements represent potentially useful taxonomic characters for distinguishing species. Reduction, increased variability, and morphological novelty are common to many lineages of dwarfed taxa. They represent a null hypothesis for examination of the developmental mechanisms and morphological consequences of miniaturization in other groups.

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DOI: 10.1111/j.1095-8312.1984.tb00806.x


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ISTEX:2AA87502023A80ED44EA7561CEB044C2A37A12A2

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<title xml:lang="en">Miniaturization and its effects on cranial morphology in plethodontid salamanders, genus Thorius (Amphibia: Plethodontidae). I. Osteological variation</title>
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<name sortKey="Hanken, J" sort="Hanken, J" uniqKey="Hanken J" first="J." last="Hanken">J. Hanken</name>
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<title level="a" type="main">Miniaturization and its effects on cranial morphology in plethodontid salamanders, genus
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<term>Adult body size</term>
<term>Adult females</term>
<term>Adult males</term>
<term>Adult size determination</term>
<term>Adult skull</term>
<term>Adult thorius</term>
<term>Alberch</term>
<term>Alberch alberch</term>
<term>Amphibia</term>
<term>Ancestral mineralization sequence</term>
<term>Angeles counly</term>
<term>Anterior elements</term>
<term>Anterior skull region</term>
<term>Anteriorly</term>
<term>Biological reviews</term>
<term>Body size</term>
<term>Character state</term>
<term>Character states</term>
<term>Cranial</term>
<term>Cranial elements</term>
<term>Cranial mineralization</term>
<term>Cranial morphology</term>
<term>Cranial ossification</term>
<term>Cranial osteology</term>
<term>Cranial reduction</term>
<term>Developmental mechanisms</term>
<term>Direct contact</term>
<term>Dorsal view</term>
<term>Evolutionary morphology</term>
<term>Extensive intraspecific variation</term>
<term>External naris</term>
<term>Extreme reduction</term>
<term>Facial lobe</term>
<term>Family plethodontidae</term>
<term>Fontanelle</term>
<term>Frequency variation</term>
<term>Full range</term>
<term>Functional analysis</term>
<term>General features</term>
<term>Generalized plethodontid salamanders</term>
<term>Genus</term>
<term>Genus thorius</term>
<term>Graduate student</term>
<term>Hanken</term>
<term>Individual elements</term>
<term>Internasal fontanelle</term>
<term>Interspecific comparisons</term>
<term>Interspecific differences</term>
<term>Intrapopulational variation</term>
<term>Intraspecific variation</term>
<term>Kansas science bullelin</term>
<term>Larger plethodontid salamanders</term>
<term>Larger salamanders</term>
<term>Larger species</term>
<term>Lateral view</term>
<term>Lineage</term>
<term>Linear array</term>
<term>Linnean society</term>
<term>Lombard wake</term>
<term>Lungless salamanders</term>
<term>Macdougalli</term>
<term>Many lineages</term>
<term>Many species</term>
<term>Marine sand</term>
<term>Marshall corruccini</term>
<term>Maxilla</term>
<term>Maxilla overlap</term>
<term>Maxillary</term>
<term>Maxillary teeth</term>
<term>Mineralization</term>
<term>Miniaturization</term>
<term>Morphological</term>
<term>Morphological diversity</term>
<term>Morphological evolution</term>
<term>Morphological novelty</term>
<term>Morphological variation</term>
<term>Morphology</term>
<term>Narisovalis</term>
<term>Nasal</term>
<term>Nasal capsule</term>
<term>Nasal capsules</term>
<term>Nasal development</term>
<term>Nasalmaxilla overlap</term>
<term>Neotropical</term>
<term>Null hypothesis</term>
<term>Ontogeny</term>
<term>Osteological characters</term>
<term>Other characters</term>
<term>Other genera</term>
<term>Other groups</term>
<term>Other plethodontid genera</term>
<term>Otic capsule</term>
<term>Otic capsules</term>
<term>Overlap</term>
<term>Paedomorphosis</term>
<term>Pennatulus</term>
<term>Phylogenetic</term>
<term>Phylogenetic relationship</term>
<term>Phylogenetic size decrease</term>
<term>Plethodontid</term>
<term>Plethodontid salamanders</term>
<term>Plethodontidae</term>
<term>Posthatching cranial mineralization</term>
<term>Posthatching mineralization sequence</term>
<term>Prefrontal</term>
<term>Prefrontal articulates</term>
<term>Prefrontal development</term>
<term>Premaxilla</term>
<term>Premaxillary</term>
<term>Premaxillary teeth</term>
<term>Prominent cartilaginous</term>
<term>Prov</term>
<term>Quantitative estimates</term>
<term>Relative size</term>
<term>Salamander</term>
<term>Schmidti</term>
<term>Septomaxilla</term>
<term>Septomaxilla development</term>
<term>Several genera</term>
<term>Several species</term>
<term>Sexual maturity</term>
<term>Single adult</term>
<term>Single value</term>
<term>Size change</term>
<term>Size decrease</term>
<term>Skeletal growth</term>
<term>Skeletal reduction</term>
<term>Skull</term>
<term>Small juveniles</term>
<term>Smaller species</term>
<term>Special sense organs</term>
<term>Species sample</term>
<term>Tailed tetrapods</term>
<term>Thorius</term>
<term>Ventral</term>
<term>Ventral view</term>
<term>Vertebrate</term>
<term>Vertebrate zoology</term>
<term>Vertical orientation</term>
<term>Volcan orizaba</term>
<term>Wake elias</term>
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<keywords scheme="Teeft" xml:lang="en">
<term>Adult body size</term>
<term>Adult females</term>
<term>Adult males</term>
<term>Adult size determination</term>
<term>Adult skull</term>
<term>Adult thorius</term>
<term>Alberch</term>
<term>Alberch alberch</term>
<term>Amphibia</term>
<term>Ancestral mineralization sequence</term>
<term>Angeles counly</term>
<term>Anterior elements</term>
<term>Anterior skull region</term>
<term>Anteriorly</term>
<term>Biological reviews</term>
<term>Body size</term>
<term>Character state</term>
<term>Character states</term>
<term>Cranial</term>
<term>Cranial elements</term>
<term>Cranial mineralization</term>
<term>Cranial morphology</term>
<term>Cranial ossification</term>
<term>Cranial osteology</term>
<term>Cranial reduction</term>
<term>Developmental mechanisms</term>
<term>Direct contact</term>
<term>Dorsal view</term>
<term>Evolutionary morphology</term>
<term>Extensive intraspecific variation</term>
<term>External naris</term>
<term>Extreme reduction</term>
<term>Facial lobe</term>
<term>Family plethodontidae</term>
<term>Fontanelle</term>
<term>Frequency variation</term>
<term>Full range</term>
<term>Functional analysis</term>
<term>General features</term>
<term>Generalized plethodontid salamanders</term>
<term>Genus</term>
<term>Genus thorius</term>
<term>Graduate student</term>
<term>Hanken</term>
<term>Individual elements</term>
<term>Internasal fontanelle</term>
<term>Interspecific comparisons</term>
<term>Interspecific differences</term>
<term>Intrapopulational variation</term>
<term>Intraspecific variation</term>
<term>Kansas science bullelin</term>
<term>Larger plethodontid salamanders</term>
<term>Larger salamanders</term>
<term>Larger species</term>
<term>Lateral view</term>
<term>Lineage</term>
<term>Linear array</term>
<term>Linnean society</term>
<term>Lombard wake</term>
<term>Lungless salamanders</term>
<term>Macdougalli</term>
<term>Many lineages</term>
<term>Many species</term>
<term>Marine sand</term>
<term>Marshall corruccini</term>
<term>Maxilla</term>
<term>Maxilla overlap</term>
<term>Maxillary</term>
<term>Maxillary teeth</term>
<term>Mineralization</term>
<term>Miniaturization</term>
<term>Morphological</term>
<term>Morphological diversity</term>
<term>Morphological evolution</term>
<term>Morphological novelty</term>
<term>Morphological variation</term>
<term>Morphology</term>
<term>Narisovalis</term>
<term>Nasal</term>
<term>Nasal capsule</term>
<term>Nasal capsules</term>
<term>Nasal development</term>
<term>Nasalmaxilla overlap</term>
<term>Neotropical</term>
<term>Null hypothesis</term>
<term>Ontogeny</term>
<term>Osteological characters</term>
<term>Other characters</term>
<term>Other genera</term>
<term>Other groups</term>
<term>Other plethodontid genera</term>
<term>Otic capsule</term>
<term>Otic capsules</term>
<term>Overlap</term>
<term>Paedomorphosis</term>
<term>Pennatulus</term>
<term>Phylogenetic</term>
<term>Phylogenetic relationship</term>
<term>Phylogenetic size decrease</term>
<term>Plethodontid</term>
<term>Plethodontid salamanders</term>
<term>Plethodontidae</term>
<term>Posthatching cranial mineralization</term>
<term>Posthatching mineralization sequence</term>
<term>Prefrontal</term>
<term>Prefrontal articulates</term>
<term>Prefrontal development</term>
<term>Premaxilla</term>
<term>Premaxillary</term>
<term>Premaxillary teeth</term>
<term>Prominent cartilaginous</term>
<term>Prov</term>
<term>Quantitative estimates</term>
<term>Relative size</term>
<term>Salamander</term>
<term>Schmidti</term>
<term>Septomaxilla</term>
<term>Septomaxilla development</term>
<term>Several genera</term>
<term>Several species</term>
<term>Sexual maturity</term>
<term>Single adult</term>
<term>Single value</term>
<term>Size change</term>
<term>Size decrease</term>
<term>Skeletal growth</term>
<term>Skeletal reduction</term>
<term>Skull</term>
<term>Small juveniles</term>
<term>Smaller species</term>
<term>Special sense organs</term>
<term>Species sample</term>
<term>Tailed tetrapods</term>
<term>Thorius</term>
<term>Ventral</term>
<term>Ventral view</term>
<term>Vertebrate</term>
<term>Vertebrate zoology</term>
<term>Vertical orientation</term>
<term>Volcan orizaba</term>
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<front>
<div type="abstract" xml:lang="en">Cranial skeletal morphology, ontogeny and variation are examined in five species of Thorius, a genus of diminutive plethodontid salamanders that are among the smallest, extant, tailed tetrapods. The skull of adull Thorius is characterized by: (1) limited development or absence of several ossified elements and dentition; (2) increased inter‐and intraspecific variability; (3) novel morphological configurations of the braincase and jaw suspensorium. Posthatching cranial mineralization in all species of Thorius is truncated precociously with respect to that typical of larger and more generalized plethodontid genera, such as Pseudoeurycea. These features implicate paedomorphosis as a predominant mechanism responsible for the evolution of decreased size in Thorius from larger plethodontid ancestors. Interspecific differences in cranial morphology are evident; species may be characterized by greater or lesser degrees of truncated development. However, there is no consistent relationship between degree of paedomorphosis and mean adult body size in interspecific comparisons. Adult morphology of several individual elements represent potentially useful taxonomic characters for distinguishing species. Reduction, increased variability, and morphological novelty are common to many lineages of dwarfed taxa. They represent a null hypothesis for examination of the developmental mechanisms and morphological consequences of miniaturization in other groups.</div>
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