A redescription of the appendicular skeleton of <i>Squalus acanthias</i> (Elasmobranchii: Squaliformes: Squalidae)

Silva, João Paulo C. B. Da; Vaz, Diego F. B.

doi:10.1111/azo.12394

Cited by 3 publications

(13 citation statements)

References 27 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Described the fleshy core of the nostrils in Cirrhigaleus but it did not take into account in his analysis. The pelvic articular region described here for the genus is proposed for the first time and it is in contrast to the recent description of [ 66 ] observed for C . barbifer .…”

Section: Discussioncontrasting

confidence: 65%

“…acanthias . [ 66 ] suggested that this character may be an autapomorphy for this species but our analysis shows that the barrel-shaped elements may or may not be present in S . suckleyi .…”

Section: Resultsmentioning

confidence: 65%

“…Puboischiadic bar of the pelvic girdle articulates with the pelvic fin through two different regions, one articular region for the articulation with the anterior pelvic basal (= first enlarged radial as in [ 66 ] of the pelvic fin and a second one with the basipterygium of the pelvic fin. The type of surfaces for the articulation with the pelvic fin may vary between facet or condyle.…”

Section: Resultsmentioning

confidence: 99%

“…This condition was not noticed for C . barbifer in [ 66 ] possibly due to analysis limitations of the dissected specimen.…”

Section: Resultsmentioning

confidence: 99%

“…barbifer . According to these authors, the puboischiadic bar articulates with the basipterygium through a single enlarged and reniform facet located on each posterolateral portion of the pelvic girdle and medially to the position of the condyle for articulation with the anterior pelvic element ( sensu first enlarged radial in [ 66 ]). Cirrhigaleus species lack the posterior medial process of the puboischiadic bar ( sensu posteromedian projection) as also noticed in [ 66 ].…”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Untangling the systematic dilemma behind the roughskin spurdog Cirrhigaleus asper (Merrett, 1973) (Chondrichthyes: Squaliformes), with phylogeny of Squalidae and a key to Cirrhigaleus species

Viana

Soares²

2023

PLoS ONE

View full text Add to dashboard Cite

Cirrhigaleus comprises a small genus of rare barbel-bearing dogfish sharks with distributions in limited regions of all oceans. Generic validity and taxonomic status of some species are upon controversies by morphological and molecular evidence that often suggest reallocation of Cirrhigaleus species into the genus Squalus. Particularly, the roughskin spurdog C. asper exhibits intermediary morphological characteristics within Squalidae that requires clarification. In the present study, a phylogenetic approach was undertaken to test the correct generic placement of C. asper using novel and revised morphological characters. We performed maximum parsimony analysis of 51 morphological characters of the internal (e.g., neurocranium, clasper cartilages, pectoral and pelvic girdles) and external anatomy applied to 13 terminal taxa. Cirrhigaleus represents a valid genus and it is supported by eight synapomorphies: high number of monospondylous vertebrae; medial nasal lobe supported by fleshy core and innervated by the buccopharyngeal branch of the facial nerve; neurocranium with greatest width across nasal capsules; one facet and one condyle in the puboischiadic bar for articulating with the basipterygium; two intermediate segments between the basipterygium of the pelvic fin and the axial cartilage of the claspers; five terminal clasper cartilages; and posterior medial process of the puboischiadic bar absent. Cirrhigaleus asper is sister-species to a small clade comprising C. barbifer and C. australis which is supported by one synapomorphy, presence of conspicuous cusplets in the dermal denticles. Cirrhigaleus barbifer, C. asper and C. australis are redescribed herein and the neotype of C. barbifer is designated. A key to Cirrhigaleus species is also given and the inner relationships within Squalus is tentatively discussed.

show abstract

Section: Discussioncontrasting

confidence: 65%

“…acanthias . [ 66 ] suggested that this character may be an autapomorphy for this species but our analysis shows that the barrel-shaped elements may or may not be present in S . suckleyi .…”

Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

“…This condition was not noticed for C . barbifer in [ 66 ] possibly due to analysis limitations of the dissected specimen.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Untangling the systematic dilemma behind the roughskin spurdog Cirrhigaleus asper (Merrett, 1973) (Chondrichthyes: Squaliformes), with phylogeny of Squalidae and a key to Cirrhigaleus species

Viana

Soares²

2023

PLoS ONE

View full text Add to dashboard Cite

show abstract

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

Silva

Shimada

Datovo

2023

Journal of Morphology

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Morphology and phylogenetic significance of the pelvic articular region in elasmobranchs (Chondrichthyes)

Silva

Vaz

2023

Cladistics

View full text Add to dashboard Cite

The morphology of paired fins is commonly overlooked in morphological studies, particularly the pelvic girdle and fins. Consequently, previous phylogenetic studies incorporating morphological data used few skeletal characters from this complex. In this paper, the phylogenetic significance of pelvic articular characters for elasmobranchs is discussed in light of the morphological variation observed in 130 species, the most comprehensive study exploring the morphology of the pelvic girdle done so far. The 10 morphological characters proposed herein for the pelvic articulation were incorporated into a molecular matrix of NADH2 sequences and submitted to an analysis of maximum parsimony employing extended implied weighting. The most stable tree was selected based on the distortion coefficients, SPR distances (subtree pruning and regrafting) and fit values. Some of the striking synapomorphies recovered within elasmobranchs include the presence of an articular surface for the first enlarged pelvic radial supporting Elasmobranchii and the pelvic articular region for the basipterygium extending from the posterolatral margin of the pelvic girdle over its lateral surface in Echinorhinus + Hexanchiformes. Additionally, the proposed characters and their distributions are discussed considering the relationships recovered and also compared with previous morphological and molecular phylogenetic hypotheses.

show abstract

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

Cited by 3 publications

References 27 publications

Untangling the systematic dilemma behind the roughskin spurdog Cirrhigaleus asper (Merrett, 1973) (Chondrichthyes: Squaliformes), with phylogeny of Squalidae and a key to Cirrhigaleus species

Untangling the systematic dilemma behind the roughskin spurdog Cirrhigaleus asper (Merrett, 1973) (Chondrichthyes: Squaliformes), with phylogeny of Squalidae and a key to Cirrhigaleus species

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

Morphology and phylogenetic significance of the pelvic articular region in elasmobranchs (Chondrichthyes)

Contact Info

Product

Resources

About