Abstract Most studies on excavation behaviour of A mphisbaenia have been based descriptive analysis through visual observation or external body motion records. Herein, we recorded the excavatory gaits shovel‐headed amphisbaenid L eposternon microcephalum using videofluoroscopy. This technique films by X ‐ray emission, allowing a more detailed amphisbaenid's underground locomotor and performance. Thus, described, for first time, its ascendant cycle backward movement. Furthermore, analysed...

Morphological descriptions comparing Leposternon microcephalum and L. scutigerum have been made previously. However, these taxa lack a formal quantitative morphological characterization, comparative studies suggest that morphology burrowing performance are be related. The excavatory movements of described in detail. there is locomotor patterns and/or among different amphisbaenids sharing the same skull shape. This paper presents first study morphometric variations between two closely related...

The excavatory movements of the spade-snouted amphisbaenid Leposternon microcephalum (Reptilia, Squamata) was studied with aid videofluorscopy (X-ray) techniques.This allows observation skull and column along tunneling, a more detailed motion observation, being so novel approach for amphisbaenian researches.A single specimen kept in glass terrarium filled semoline, filmed scopy machine.Fixed anatomical marks on head were put drawings from framed recordings.Selected sequences recordings...

Abstract The bottlenose dolphin, genus Tursiops , is cosmopolitan occurring in tropical and temperate regions, with morphological variation between within different oceans. Since the genus' taxonomy has been under discussion for a long time, this work aimed at analyzing cranial variability of T. truncatus from regions world. Geometric Morphometrics analyses were performed 201 skulls adult specimens, on dorsal, ventral, lateral views, Eastern North Pacific, Atlantic, South Western Atlantic...

Abstract Amphisabenia is a group of squamates adapted for fossorial lifestyle. The skull the animal's main digging tool, and can present one four principal shapes. shovel‐headed shape considered to be most specialized digging. South American genus Leposternon presents morphotype, widely distributed on this continent. general pattern may vary considerably, even within same genus, we hypothesized that variation influenced primarily by body size geographical factors. This study investigated in...

Morphological variation of the ramus mandibulae wild Sus scrofa was described and correlated to sex age differences.Young forms (n=27, 15 males, 12 females) adults (n=23, 13 10 were analyzed through Geometric Morphometrics (2-D) assess differences between groups.We found significant age-and sex-related shape variations at level.Young boars present bulky angular process with backward oriented coronoid process, while show slender jaw vertical ramus, orthogonally process.The in female is more...

Leposternon microcephalum is a species belonging to the Amphisbaenia, group of burrowing reptiles. Amphisbaenia present various morphological and physiological adaptations that allow them penetrate ground live underground, through system galleries permanent chambers they build themselves. Among in this group, those skull stand out as it serves main excavation tool. Four basic shapes are recognized: rounded, keeled, shovel-shaped, spade-shaped. The L. belongs last type, which considered most...

Abstract We investigated the occurrence of congenital dental abnormalities in 94 wild boars Sus scrofa , and 20 Iberian pigs domesticus from Doñana (DNP) Sierra de Andújar Natural Park (ANP) southern Spain. The only variation found was agenesis lower first premolar, either deciduous (Dp 1 ) or permanent (P ). analyzed prevalence variations using: odds ratios, Fisher’s exact test logistic-regression models. premolar has often been reported to be absent modern domestic breeds pigs, but it is...

Abstract The echimyid rodents of the genus Thrichomys vary considerably in their behavior and feeding ecology, reflecting occurrence environments as different Caatinga, Cerrado, Pantanal, Chaco biomes. While was originally classified monospecific, a number species have been recognized recent decades, based on morphometric, cytogenetic, molecular analyses. is well studied, variation found its cranial morphology poorly understood, given taxonomic ecological complexities genus. Using geometric...

A type of locomotor behavior observed in animals with rigid bodies, that can be found many exoskeletons, shells, or other forms body armor, to change direction, is the turning behavior. Aquatic floated-turning among bodies have been studied whirligig beetles, boxfish, and more recently freshwater turtle, Chrysemys picta. In laboratory we a different kind movement consists an underwater during foraging, wherein animal pivoted its body, using one hindlimbs as fixed-point support substratum. We...

Background. Morphological descriptions comparing Leposternon microcephalum and L. scutigerum are known. However, these taxa lack of a formal quantitative morphological characterization comparison between their morphometric patterns. Studies suggest that morphology burrowing performance seem to be related. For example, the robustness head in is positively associated digging force. The excavatory movements this species were described detail. there studies locomotor patterns and/or among...

Background. Morphological descriptions comparing Leposternon microcephalum and L. scutigerum are known. However, these taxa lack of a formal quantitative morphological characterization comparison between their morphometric patterns. Studies suggest that morphology burrowing performance seem to be related. For example, the robustness head in is positively associated digging force. The excavatory movements this species were described detail. there studies locomotor patterns and/or among...

Amphisbaenians are fossorial reptiles that have a cylindrical and elongated body covered with scales arranged in rings, all apodal, except for the three species of genus Bipes. The amphisbaenian diet consists variety invertebrates small vertebrates. As these animals live underground, many aspects their natural history difficult to study. Most feeding studies amphisbaenians focused on composition ecology, data available behavior based precursory observations. present study describes food...