Results 111 to 120 of about 124,493 (301)

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Dimorphism and population size of the Mexican redrump tarantula,Brachypelma vagans (Araneae: Theraphosidae), in Southeast Mexico

Revista Mexicana de Biodiversidad, 2015
As a general rule, spiders exhibit sexual dimorphism and their populations may differ in size according to season duration and resourceavailability. However, few studies have focused on dimorphism in tarantulas.
Yann Hénaut, Salima Machkour-M’Rabet, Holger Weissenbergerc, Roberto Rojo   +3 more
doaj   +1 more source

3D anatomical atlas of the heads of male and female adult Chamaeleo calyptratus

The Anatomical Record, EarlyView.
The veiled chameleon is a model organism in reptile development research. Utilizing contrast‐enhanced microCT and deep learning segmentation models, we have generated the first digital atlases of the skull, nervous system, cranial muscles and hyolingual muscles.
Alice Leavey, Eloy Gálvez‐López, Anthony Herrel, Laura B. Porro   +3 more
wiley   +1 more source

First Evidence of Secondary Sexual Dimorphism in the Freshwater Fish Family Botiidae: A Newly Recognised Synapomorphy of Loaches (Cypriniformes: Cobitoidea)

Fishes
Within the freshwater fish order Cypriniformes, loaches form a monophyletic lineage comprising nine families with more than 1400 species. Secondary sexual dimorphism is widespread among loach families, most notably in the form of enlarged pectoral fins ...
Jörg Bohlen, Tomáš Dvořák, Vendula Šlechtová   +2 more
doaj   +1 more source

New craniodental materials of Falcarius utahensis (Theropoda: Therizinosauria) reveal patterns of intraspecific variation and cranial evolution in early coelurosaurians

The Anatomical Record, EarlyView.
Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley   +1 more source

The Involvement of Melatonin in the Dimorphism of Glucose and Lipid Metabolism of Tilapia

Biomolecules
In tilapia, males grow faster than females, but the metabolites/pathways behind this sexual dimorphism remain unclear. In this study, we first examined growth, feeding, serum biochemical parameters, and mRNA expression in tilapia under mono-sex and mixed-
Jingkai Qin, Chenguang Liu, Zongzhen Liao, Yang Yu, Caiyun Sun, Wensheng Li   +5 more
doaj   +1 more source

Morphological variation in atlas and axis of Neotropical spiny rats (Rodentia, Echimyidae)

The Anatomical Record, EarlyView.
Abstract The unique morphologies of the first two cervical vertebrae, the atlas and axis, represent a significant innovation in mammalian evolution. These structures support the weight of the head and enable intricate movements of the head and neck.
Thomas Furtado da Silva Netto, João Felipe Leal Kaiuca, Adriana Itatí Olivares, William Corrêa Tavares   +3 more
wiley   +1 more source

Evolution of craniofacial shape in relation to sexual dimorphism in Theropithecus and Papio

Frontiers in Ecology and Evolution
IntroductionSexual dimorphism in cranial morphology is a significant aspect of primate evolution, providing insights into evolutionary pressures and mating systems in different species.
Ángeles Ossorio, Ambra Figueroa-Torrejón, Rodrigo Buston, Matteo Caldon, Jacinto Mathe, Jacinto Mathe, Giuliano Doria, Spartaco Gippoliti, Spartaco Gippoliti, Antonella Volta, María Joana Ferreira da Silva, María Joana Ferreira da Silva, María Joana Ferreira da Silva, René Bobe, René Bobe, René Bobe, Susana Carvalho, Susana Carvalho, Susana Carvalho, Susana Carvalho, Cristian Capelli, Felipe I. Martínez   +21 more
doaj   +1 more source

Neuroanatomical diversity in Teleocichla with new volumetric and histological insights into the encephalon of Teleocichla monogramma Kullander 1988

The Anatomical Record, EarlyView.
Abstract Teleocichla comprises small cichlids that inhabit the rapid streams of Amazonian rivers; however, there has been limited research on their encephalon morphology. This study examined the neuroanatomy of four species, focusing on volumetric measurements of their encephalon subregions, and providing a histological description of the encephalon of
Renan Leão‐Reis, Keila Xavier Magalhães, Thiago Nilton A. Pereira, Janice Muriel‐Cunha, Alberto Akama   +4 more
wiley   +1 more source

Fungal Infection Induces Sex-Specific Transcriptional Changes and Alters Sexual Dimorphism in the Dioecious Plant Silene latifolia.

PLoS Genetics, 2015
Sexual dimorphism, including differences in morphology, behavior and physiology between females and males, is widespread in animals and plants and is shaped by gene expression differences between the sexes.
Niklaus Zemp, Raquel Tavares, Alex Widmer   +2 more
doaj   +1 more source