Scapulocoracoid morphology in the skates of the tribe Riorajini (Elasmobranchii, Rajiformes, Arhynchobatidae)

Soares, Karla D. A.; Gomes, Ulisses Leite; Santos, Hugo Ricardo Secioso

doi:10.1007/s00435-020-00504-2

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…In all other taxa examined, both cartilages are distant from each other (58, 0). The scapulocoracoid presents an anterior bridge dividing the anterior fontanelle in two, anterodorsal and anteroventral fontanelles (Soares et al, 2020), in the torpediniform N. brasiliensis, the guitarfishes P. horkelii and Z. brevirostris, and the rajiforms A. radiata, B. nigriventralis, P. extenta, S. acuta, S. bonapartii and riorajinis (59, 0; Figure 8c). This bridge is absent in C. rugosa, Dactylobatus clarkii, Dipturus cf.…”

Section: Visceral Archesmentioning

confidence: 99%

“…Moreover, some characters analysed in that study are not independent, or their state characters are not mutually exclusive, requiring a reexamination and reinterpretation of these. Detailed descriptions on anatomical structures and ontogenetic changes in species of Rioraja and Atlantoraja were recently provided (Moreira et al, 2017; Soares et al, 2020; Soares, Moreira, & Gomes, 2021; Soares, Moreira, Silva, et al, 2021) but phylogenetic relationships within the tribe remain not fully understood since no cladistic analysis including morphological characters has ever been performed.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeny of the tribe Riorajini with comments on the morphological character evolution within Rajiformes (Chondrichthyes, Batoidea)

2023

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The tribe Riorajini is composed of four species, Rioraja agassizii, Atlantoraja castelnaui, A. cyclophora and A. platana, which are endemic to the inshore waters of the Southwestern Atlantic Ocean. Previous studies have hypothesized the monophyly of this group but interrelationships within its members remain not fully understood. In this study, we analysed quantitative as well as qualitative morphological characters related to external morphology, squamation, neurocranium, visceral arches, pectoral and pelvic girdles and claspers, totalizing 82 characters, representing a greater number than previously used in studies focused on rajiform systematics. 24 terminal taxa were included, and two different analyses were carried out testing Narcine brasiliensis and Pseudobatos horkelii as roots of the cladogram. The monophyly of Riorajini is supported by five quantitative and three discrete characters, including a caudal length smaller than disc length, sensory pores and mucous canals darkly pigmented on ventral surface of disc, and preorbital flange present. Clasper morphology was phylogenetically informative since it contributes to diagnose Rioraja in which an accessory terminal 2 cartilage is absent and to support a sister relationship between A. cyclophora + A. platana. Squamation, teeth and neurocranial morphology need to be thoroughly investigated in order to revise their terminology, propose and test hypotheses of homology and improve our knowledge on morphological variation regarding ontogeny and sexual dimorphism.

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Section: Visceral Archesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phylogeny of the tribe Riorajini with comments on the morphological character evolution within Rajiformes (Chondrichthyes, Batoidea)

2023

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Redescription of the Rio skate Rioraja agassizii (Rajiformes: Arhynchobatidae) with notes on internal anatomy and intraspecific variation

2021

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Rioraja agassizii belongs to the monotypic genus Rioraja and differs from the other Riorajini species of the genus Atlantoraja by the shape of anterior nasal flap, squamation, clasper skeleton, body measurements and color pattern. Although R. agassizii is a well-known species, commonly captured in inshore waters of the southwestern Atlantic, its external morphology and internal anatomy have never been fully described and little is known on intraspecific variation within the species. Juvenile and adult, male and female specimens were examined, measured and dissected. Herein, we redescribe the species and present detailed descriptions and illustrations of external morphology, neurocranium, jaws, hyoid and gill arches, and pelvic fin and girdle. Additionally, notes on sexual dimorphism and ontogenetic differences in coloration, body and cranial measurements, and dermal denticles are provided.

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Taxonomy and morphology of the skate genus Atlantoraja (Rajiformes: Arhynchobatidae)

et al. 2021

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The skate genus Atlantoraja is composed of three species (A. castelnaui, A. cyclophora, and A. platana) which differ from the other Riorajini species, Rioraja agassizii, in regards to their clasper features, squamation and presence of a caudal fin. Despite of being distributed along Southwestern Atlantic and commonly captured by fisheries in Brazil, Uruguay and Argentina, detailed accounts on external and internal morphology are scarce and the taxonomic status of Atlantoraja species was not revised so far. The aim of this study, therefore, is to review the taxonomy of the genus Atlantoraja, updating information on type specimens and clarifying misidentifications among species, and to describe in detail anatomical structures such as neurocranium, visceral arches, pelvic girdle, dermal denticles and teeth. Lectotypes and paralectotypes are designated for Atlantoraja castelnaui and A. cyclophora. Notes on intraspecific variation within species are also provided. Atlantoraja cyclophora and A. platana are more similar to each other than to A. castelnaui in regards to the squamation (body dorsal surface smooth vs. densely covered by prickles) and color pattern of body dorsal surface, position of orbital foramina, overall shape of neucrocranium and body measurements. Lastly, we discuss the morphological differences among species of Atlantoraja and recommend the inclusion of characters presented here in future cladistic analyses.

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Scapulocoracoid morphology in the skates of the tribe Riorajini (Elasmobranchii, Rajiformes, Arhynchobatidae)

Cited by 3 publications

References 12 publications

Phylogeny of the tribe Riorajini with comments on the morphological character evolution within Rajiformes (Chondrichthyes, Batoidea)

Phylogeny of the tribe Riorajini with comments on the morphological character evolution within Rajiformes (Chondrichthyes, Batoidea)

Redescription of the Rio skate Rioraja agassizii (Rajiformes: Arhynchobatidae) with notes on internal anatomy and intraspecific variation

Taxonomy and morphology of the skate genus Atlantoraja (Rajiformes: Arhynchobatidae)

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