Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)

The excavatory movements of the spade-snouted amphisbaenid Leposternon microcephalum (Reptilia, Squamata) was studied with the aid of videofluorscopy (X-ray) techniques. This allows the observation of skull and column movements along tunneling, and a more detailed motion observation, being so a nove...

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Autores principales:	Barros-Filho,José Duarte de, Hohl,Leandro dos Santos Lima, Rocha-Barbosa,Oscar
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2008
Materias:	Reptilia Amphisbaenia Leposternon microcephalum Scopy Locomotion
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200027
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spelling	oai:scielo:S0717-950220080002000272008-11-25Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)Barros-Filho,José Duarte deHohl,Leandro dos Santos LimaRocha-Barbosa,Oscar Reptilia Amphisbaenia Leposternon microcephalum Scopy Locomotion The excavatory movements of the spade-snouted amphisbaenid Leposternon microcephalum (Reptilia, Squamata) was studied with the aid of videofluorscopy (X-ray) techniques. This allows the observation of skull and column movements along tunneling, and a more detailed motion observation, being so a novel approach for amphisbaenian excavatory rescarches. A single specimen of Leposternon microcephalum was kept in a glass terrarium filled with semoline, and filmed with a scopy (X-ray) machine. Fixed anatomical marks on the head of the specimen were put in drawings from the framed recordings. Selected sequences of the recordings were fragmented in isolated frames for motion observation. The analysis of the recordings revealed a repetitive pattern of excavatory cycles, with retreating and downward bending of the head before its upstroke to compact the substrate tunnel roof. Follows a dropping of the head, which lays over the substrate giving support for the next retreating and downward head bending. This is an essential step that was neglected in earlier cycle descriptions. The initial downward head bending was not previously properly described for spade-snouted amphisbaenians. The excavatory movements of spade-snouted amphisbaenians are usually treated as a two-stepped cycle, but the evidence that this excavatory cycle has three steps is given here.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.26 n.2 20082008-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200027en10.4067/S0717-95022008000200027
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Reptilia Amphisbaenia Leposternon microcephalum Scopy Locomotion
spellingShingle	Reptilia Amphisbaenia Leposternon microcephalum Scopy Locomotion Barros-Filho,José Duarte de Hohl,Leandro dos Santos Lima Rocha-Barbosa,Oscar Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
description	The excavatory movements of the spade-snouted amphisbaenid Leposternon microcephalum (Reptilia, Squamata) was studied with the aid of videofluorscopy (X-ray) techniques. This allows the observation of skull and column movements along tunneling, and a more detailed motion observation, being so a novel approach for amphisbaenian excavatory rescarches. A single specimen of Leposternon microcephalum was kept in a glass terrarium filled with semoline, and filmed with a scopy (X-ray) machine. Fixed anatomical marks on the head of the specimen were put in drawings from the framed recordings. Selected sequences of the recordings were fragmented in isolated frames for motion observation. The analysis of the recordings revealed a repetitive pattern of excavatory cycles, with retreating and downward bending of the head before its upstroke to compact the substrate tunnel roof. Follows a dropping of the head, which lays over the substrate giving support for the next retreating and downward head bending. This is an essential step that was neglected in earlier cycle descriptions. The initial downward head bending was not previously properly described for spade-snouted amphisbaenians. The excavatory movements of spade-snouted amphisbaenians are usually treated as a two-stepped cycle, but the evidence that this excavatory cycle has three steps is given here.
author	Barros-Filho,José Duarte de Hohl,Leandro dos Santos Lima Rocha-Barbosa,Oscar
author_facet	Barros-Filho,José Duarte de Hohl,Leandro dos Santos Lima Rocha-Barbosa,Oscar
author_sort	Barros-Filho,José Duarte de
title	Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
title_short	Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
title_full	Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
title_fullStr	Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
title_full_unstemmed	Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)
title_sort	excavatory cycle of leposternon microcephalum wagler, 1824 (reptilia, amphisbaenia)
publisher	Sociedad Chilena de Anatomía
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200027
work_keys_str_mv	AT barrosfilhojoseduartede excavatorycycleofleposternonmicrocephalumwagler1824reptiliaamphisbaenia AT hohlleandrodossantoslima excavatorycycleofleposternonmicrocephalumwagler1824reptiliaamphisbaenia AT rochabarbosaoscar excavatorycycleofleposternonmicrocephalumwagler1824reptiliaamphisbaenia
_version_	1718444627778863104

Excavatory Cycle of Leposternon microcephalum Wagler, 1824 (Reptilia, Amphisbaenia)

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