The coracoid bar and its phylogenetic importance for elasmobranchs (Chondrichthyes)

Silva, João Paulo Capretz Batista Da; Datovo, Aléssio

doi:10.1016/j.jcz.2020.06.004

Cited by 10 publications

(10 citation statements)

References 18 publications

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“…Barrel‐shaped elements are not reported in any other squaliform or even elasmobranch taxa (Silva, 2014; Silva et al., 2018; Silva & Datovo, 2020; this study). Similar to our observations, Viana et al.…”

Section: Discussionmentioning

confidence: 45%

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A redescription of the appendicular skeleton of Squalus acanthias (Elasmobranchii: Squaliformes: Squalidae)

Silva

Vaz

2021

Acta Zoologica

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The anatomy of Squalus acanthias has been explored and investigated for the past 150 years. Despite being a relatively well‐known species, some anatomical inaccuracies on the paired fins persist throughout the literature, such as the presence of suprascapular cartilages and the morphology of the articular region of the pectoral fin. This study reassesses and provides new descriptions of the paired fins of Squalus acanthias, including comparisons with other representatives of Squalidae, aimed to expand the anatomical information of these species. All examined species of Squalus have two sites in the scapulocoracoid for the articulation of the pectoral basals: one facet articulating with the propterygium and a condyle for the mesopterygium (or both meso‐ and metapterygium). Additionally, the scapulocoracoid does not have a scapular process. Squalus acanthias is unique for having a series of barrel‐shaped elements in the anterior region of the scapula. These elements are lacking in all other examined species of Squalus and Cirrhigaleus (and sharks in general) and are likely an autapomorphy of S. acanthias.

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Section: Discussionmentioning

confidence: 45%

“…(2015), Silva et al. (2018), Silva and Datovo (2020). Institutional abbreviations follow Sabaj (2020).…”

Section: Methodsmentioning

confidence: 99%

A redescription of the appendicular skeleton of Squalus acanthias (Elasmobranchii: Squaliformes: Squalidae)

Silva

Vaz

2021

Acta Zoologica

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“…Furthermore, the differences in skeletal or terminological interpretations may also obscure the phylogenetic signal of the appendicular skeleton. For example, Stone and Shimada (2019) reported a sternum in Odontaspis noronhai , but we determined through this present study that this structure is absent in the species or any other lamniform (note: the only taxon with a sternum observed among the extant sharks we examined was the hexanchiform Notorynchus cepedianus : Silva & Carvalho, 2015; Figure 31E; Silva & Datovo, 2020; Figure 3c).…”

Section: Discussionmentioning

confidence: 65%

“…About half of them were cranial characters, and they noted that there are many other potential phylogenetically informative anatomical characters that have not yet been explored in detail. For example, data from the appendicular skeleton have been proved phylogenetically relevant for several elasmobranch groups (Silva & Datovo, 2020; Silva et al, 2020; Silva & Carvalho, 2015; Silva et al, 2015, 2018), but an in‐depth analysis of this skeletal system in lamniforms has never been conducted previously. Therefore, by building on Stone and Shimada's (2019) study, this present study investigates the phylogenetic signal and relevance of the paired girdles and fins in lamniforms.…”

Section: Introductionmentioning

confidence: 99%

The importance of the appendicular skeleton for the phylogenetic reconstruction of lamniform sharks (Chondrichthyes: Elasmobranchii)

Silva

Shimada

Datovo

2023

Journal of Morphology

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Lamniform sharks are one of the more conspicuous groups of elasmobranchs, including several emblematic taxa as the white shark. Although their monophyly is well supported, the interrelationships of taxa within Lamniformes remains controversial because of the conflict among various previous molecular‐based and morphology‐based phylogenetic hypotheses. In this study, we use 31 characters related to the appendicular skeleton of lamniforms and demonstrate their ability to resolve the systematic interrelationships within this shark order. In particular, the new additional skeletal characters resolve all polytomies that were present in previous morphology‐based phylogenetic analyses of lamniforms. Our study demonstrates the strength of incorporating new morphological data for phylogenetic reconstructions.

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“…Morphological studies in the 21st century have also examined the phylogenetic relationships of sawsharks with contrasting results. & Datovo, 2020). In regard to sawshark claspers, the external appearance is similar to squaliform sharks (Weigmann, Stehmann, & Thiel, 2014) and the arrangement of the muscles is shared with dogfish sharks and angel sharks, but also some batoids (Moreira & de Carvalho, 2018, 2019.…”

Section: Higher Order Relationshipsmentioning

confidence: 98%

The Sawshark Redemption: Current knowledge and future directions for sawsharks (Pristiophoridae)

Nevatte

Williamson

2020

Fish and Fisheries

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Sawsharks (Order: Pristiophoriformes, Family: Pristiophoridae) are a highly distinctive group of sharks, characterized by a tapering saw-like rostrum with a pair of elongate barbels on the ventral surface. Their unusual characteristics should attract attention; however, very few studies have been dedicated to sawsharks. As a result, our understanding of their biology and ecology is limited. However, information on aspects of their biology and ecology can be found in studies not directly focussing on sawsharks. This review provides a synthesis of information pertaining to the 10 recognized sawshark species following a comprehensive search of the scientific literature. We cover their distributions, habitat utilization, life histories, reproduction, trophic dynamics and sensory biology. Current knowledge on their unique rostral structures, the evolutionary history of pristiophorids, taxonomy, behaviour and threats to sawshark populations are also reviewed. This compilation serves as a foundation for sawshark researchers and highlights key knowledge gaps in this unique group of elasmobranchs, thereby beginning the sawshark redemption.

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The coracoid bar and its phylogenetic importance for elasmobranchs (Chondrichthyes)

Cited by 10 publications

References 18 publications

A redescription of the appendicular skeleton of Squalus acanthias (Elasmobranchii: Squaliformes: Squalidae)

A redescription of the appendicular skeleton of Squalus acanthias (Elasmobranchii: Squaliformes: Squalidae)

The importance of the appendicular skeleton for the phylogenetic reconstruction of lamniform sharks (Chondrichthyes: Elasmobranchii)

The Sawshark Redemption: Current knowledge and future directions for sawsharks (Pristiophoridae)

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