Anatomical Observations on the Head of <i>Anomalepis aspinosus</i> (Typhlopidae, Ophidia)

Haas, Georg

doi:10.1111/j.1463-6395.1968.tb00147.x

Cited by 47 publications

(72 citation statements)

References 14 publications

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“…It is, again, a comparison with the leptotyphlopid condition that best corroborates Haas' (1964Haas' ( , 1968 interpretation of the element in question as the prefrontal. The prefrontal in typhlopids is a rather simple element that provides the lateral cover of the snout complex ( Fig.…”

Section: The Maxilla and The Orbital Complexsupporting

confidence: 62%

“…McDowell (1987: 14) called this process the ''prefrontal pedicel'' and compared it to a similar structure in Acrochordus, acknowledging their convergent occurrence in the two taxa. Indeed, the prefrontal pedicel originates from the anterodorsal corner of the frontal in Acrochordus, but from the posterodorsal corner of the frontal in L. albirostris and other anomalepidids such as A. aspinosus (Haas, 1968) and T. squamosus (Fig. 6A).…”

Section: The Maxilla and The Orbital Complexmentioning

confidence: 98%

“…Their interpretation was accepted by List (1966). Haas (1964Haas ( , 1968 identified the element as a prefrontal on the basis of its direct articulation with the maxilla, and its position superficial to the lateral nasal gland. His interpretation was subsequently accepted by McDowell (1974McDowell ( , 1987.…”

Section: The Maxilla and The Orbital Complexmentioning

confidence: 99%

“…Considered to be the sistergroup to all other extant snakes (Alethinophidia) on the basis of both morphological and molecular evidence (e.g., Underwood, 1967;Heise et al, 1995;Tchernov et al, 2000;Lee and Scanlon, 2002;Slowinski and Lawson, 2002;Hedges, 2002, 2004;Vidal and David, 2004;Lee et al, 2007), scolecophidians nevertheless exhibit a ''vexing mixture of primitive and derived characters'' (Kley, 2006: 510) that has attracted the attention of systematists and functional anatomists alike (e.g., Kley and Brainerd, 1999). Among the scolecophidians, the cranial anatomy of the anomalepidid genera Anomalepis and Liotyphlops has received special attention in detailed anatomical and histological descriptions offered by Haas (1964Haas ( , 1968. From these descriptions, anomalepidids emerge as the potentially most ''primitive'' extant snakes, characterized by the possible presence of a jugal in Liotyphlops (McDowell and Bogert, 1954;Haas, 1962), and the possible presence of ''a last vestige of the obliterated upper jugal arch'' in Anomalepis (Haas, 1968: 121).…”

Section: Introductionmentioning

confidence: 97%

“…Given the considerable interest generated by those observations, and the fact that no detailed study of the skull anatomy of anomalepidids has been conducted since the work published by Haas (1964Haas ( , 1968, we describe in detail the skull anatomy of Liotyphlops albirostris based on high-resolution X-ray computed tomography (HRXCT). The skull anatomy of Liotyphlops is compared in detail with that of another anomalepidid, Typhlophis squamosus, as well as with the scolecophidians Typhlops jamaicensis and Leptotyphlops dulcis, all available as HRXCT scans as well.…”

Section: Introductionmentioning

confidence: 99%

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Morphology of the skull of the white‐nosed blindsnake, Liotyphlops albirostris (Scolecophidia: Anomalepididae)

Rieppel

Kley

Maisano

2008

Journal of Morphology

178

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This article presents a detailed description and illustration of the skull of Liotyphlops albirostris in comparison to the skulls of Typhlophis squamosus, Leptotyphlops dulcis, and Typhlops jamaicensis, based on high-resolution X-ray computed tomography (HRXCT). The skull of T. squamosus is illustrated and discussed in detail for the first time. A number of uniquely shared derived characters is identified that support the monophyly of the clade Anomalepididae. Anomalepidids retain some features that are plesiomorphic relative to other scolecophidians, such as the presence of a supratemporal (except in Anomalepis) and ectopterygoid. The homology of the element located posteroventral to the eyeball in anomalepidids and variably referred to as a jugal or postorbital (or a fusion of both in Anomalepis) remains unknown. Scolecophidians exhibit a highly derived skull morphology adapted to head-first burrowing. Both anomalepidids and typhlopids evolved a condition known as an "outer shell design," but did so in different ways. Leptotyphlopids combine elements of both the anomalepidid and typhlopid snout morphologies.

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Section: The Maxilla and The Orbital Complexsupporting

confidence: 62%

Section: The Maxilla and The Orbital Complexmentioning

confidence: 98%

Section: The Maxilla and The Orbital Complexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Morphology of the skull of the white‐nosed blindsnake, Liotyphlops albirostris (Scolecophidia: Anomalepididae)

Rieppel

Kley

Maisano

2008

Journal of Morphology

178

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Homology of the Jaw Muscles in Lizards and Snakes—A Solution from a Comparative Gnathostome Approach

Johnston

2014

The Anatomical Record

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Homology or shared evolutionary origin of jaw adductor muscles in lizards and snakes has been difficult to establish, although snakes clearly arose within the lizard radiation. Lizards typically have temporal adductors layered lateral to medial, and in snakes the muscles are arranged in a rostral to caudal pattern. Recent work has suggested that the jaw adductor group in gnathostomes is arranged as a folded sheet; when this theory is applied to snakes, homology with lizard morphology can be seen. This conclusion revisits the work of S.B. McDowell, J Herpetol 1986; 20:353-407, who proposed that homology involves identity of m. levator anguli oris and the loss of m. adductor mandibulae externus profundus, at least in "advanced" (colubroid) snakes. Here I advance the folded sheet hypothesis across the whole snake tree using new and literature data, and provide a solution to this homology problem. Anat Rec, 297:574-585,

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Osteology and Cartilaginous Elements ofTrilepida salgueiroi(Amaral, 1954) (Scolecophidia: Leptotyphlopidae)

Pinto

Martins²,

Curcio

et al. 2015

The Anatomical Record

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Morphological and anatomical studies on the Leptotyphlopidae have increased in the past 10 years, providing important data on the systematics of this group, mainly focused on the skull and lower jaw morphology. However, most studies are based on a single specimen, rarely combining more than one single method of assessing morphological information. Therefore, several data on postcranial morphology, sexual dimorphism, and ontogenetic and intraspecific variation of leptotyphlopids remain poorly understood. Herein, we provide a detailed description of the cranial and postcranial skeleton of Trilepida salgueiroi based on more than 20 specimens (including males, females and juveniles), as well as a description of osteology and cartilaginous elements through the use of combined methodologies such as X-ray scanning, high resolution CT-scanning, and clearing and staining of articulated and disarticulated specimens. We also provide data on the presence/absence of dimorphic and intraspecific variation of the observed characters. The presence of a statolithic mass in the cavum vestibuli differs from the pattern found in other scolecophidians. A correlation of dorsal vertebrae with ventral and subcaudal scales was found (1:1), as well as total number of vertebrae with middorsal scales (1:1), thoracolumbar vertebrae and ventral scales (1:1), and a higher number of caudal vertebra with subcaudal scales (1.23:1). Intraspecific variation was found in several elements of the skull, lower jaw, pelvic girdle and vertebral number, but no evidence of sexual dimorphism was found in any of the species characters analysed. The homologies of several elements are discussed, although still remaining poorly understood and unknown. Anat

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Anatomical Observations on the Head of Anomalepis aspinosus (Typhlopidae, Ophidia)

Cited by 47 publications

References 14 publications

Morphology of the skull of the white‐nosed blindsnake, Liotyphlops albirostris (Scolecophidia: Anomalepididae)

Morphology of the skull of the white‐nosed blindsnake, Liotyphlops albirostris (Scolecophidia: Anomalepididae)

Homology of the Jaw Muscles in Lizards and Snakes—A Solution from a Comparative Gnathostome Approach

Osteology and Cartilaginous Elements ofTrilepida salgueiroi(Amaral, 1954) (Scolecophidia: Leptotyphlopidae)

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