Conserved evolution of skull shape in Caribbean head-first burrowing worm lizards (Squamata: Amphisbaenia)
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Conserved evolution of skull shape in Caribbean head-first burrowing worm lizards (Squamata: Amphisbaenia). / Kazi, Sakib; Hipsley, Christy A.
I: Biological Journal of the Linnean Society, Bind 125, Nr. 1, 2018, s. 14-29.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Conserved evolution of skull shape in Caribbean head-first burrowing worm lizards (Squamata: Amphisbaenia)
AU - Kazi, Sakib
AU - Hipsley, Christy A.
PY - 2018
Y1 - 2018
N2 - In contrast to the extraordinary adaptive radiation of Caribbean Anolis lizards, head-first burrowing worm lizards (Amphisbaenia) of the Greater Antilles show a high degree of evolutionary conservatism in both taxonomic and phenotypic diversity. While Caribbean anoles reach over 160 endemic species and six ecomorphs, amphisbaenians peak at one to seven species per island and are characterized by two distinct head shapes, each associated with a specific burrowing behaviour. Using three-dimensional landmark-based geometric morphometrics, we found that Caribbean amphisbaenians also occupy a relatively confined area of skull morphospace, with considerable overlap between species from different islands and strong morphological integration between crania and mandibles. The only exceptions were the bizarre keel-headed cadeids (Cadea) from Cuba, which appear to be unlike other round-headed Caribbean forms and closer to Mediterranean blanids (Blanus), their putative sister group. The only significant differences in skull shape were found between insular amphisbaenians and their mainland relatives, indicating that fossorial vertebrates may respond differently to ecological opportunity than other terrestrial fauna. Given their highly specialized subterranean niche, we suggest that worm lizards are under strong stabilizing selection to maintain cranial proportions for head-first digging, thus limiting their ability to exploit novel resources (e.g. microhabitat, prey) encountered in insular environments.
AB - In contrast to the extraordinary adaptive radiation of Caribbean Anolis lizards, head-first burrowing worm lizards (Amphisbaenia) of the Greater Antilles show a high degree of evolutionary conservatism in both taxonomic and phenotypic diversity. While Caribbean anoles reach over 160 endemic species and six ecomorphs, amphisbaenians peak at one to seven species per island and are characterized by two distinct head shapes, each associated with a specific burrowing behaviour. Using three-dimensional landmark-based geometric morphometrics, we found that Caribbean amphisbaenians also occupy a relatively confined area of skull morphospace, with considerable overlap between species from different islands and strong morphological integration between crania and mandibles. The only exceptions were the bizarre keel-headed cadeids (Cadea) from Cuba, which appear to be unlike other round-headed Caribbean forms and closer to Mediterranean blanids (Blanus), their putative sister group. The only significant differences in skull shape were found between insular amphisbaenians and their mainland relatives, indicating that fossorial vertebrates may respond differently to ecological opportunity than other terrestrial fauna. Given their highly specialized subterranean niche, we suggest that worm lizards are under strong stabilizing selection to maintain cranial proportions for head-first digging, thus limiting their ability to exploit novel resources (e.g. microhabitat, prey) encountered in insular environments.
KW - Amphisbaena
KW - Amphisbaenians
KW - Biogeography
KW - Blanus
KW - Burrowing
KW - Cadea
KW - Fossoriality
KW - Geometric morphometrics
KW - Greater Antilles
KW - Skull
U2 - 10.1093/BIOLINNEAN/BLY086
DO - 10.1093/BIOLINNEAN/BLY086
M3 - Journal article
AN - SCOPUS:85054801193
VL - 125
SP - 14
EP - 29
JO - Proceedings of the Linnean Society of London
JF - Proceedings of the Linnean Society of London
SN - 0024-4066
IS - 1
ER -
ID: 255688257