The Systematics and Reproductive Biology of the Galeus arae Subspecific Complex (Chondrichthyes: Scyliorhinidae)

Konstantinou, Hera; McEachran, John D.; Woolley, James B.

doi:10.1023/a:1007600228078

Cited by 8 publications

(5 citation statements)

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“…Soto (2001) and Rincon and Vooren (2006) recorded similar results for the crown shape of dermal denticles at the D and B sites with a tricuspid shape and the C1 site presented enlarged denticles in G. mincaronei (other body regions were not studied). We also observed microstructures in B and C1 denticles, consistent with the findings reported by Konstantinou et al (2000) for the Roughtail catshark Galeus arae (Nichols, 1927), the Antilles catshark G. antillensis Springer, 1979 and Springer's Sawtail catshark G. springeri Konstantinou & Cozzi, 1998.…”

Section: Discussionsupporting

confidence: 91%

“…mincaronei (other body regions were not studied). We also observed microstructures in B and C1 denticles, consistent with the findings reported by Konstantinou et al (2000) for the Roughtail catshark sites (mean = 896.7 μm) (Supporting Information: Table S2). The C1 dermal denticles of G. mincaronei (Figure 11a) were similar to those of G. antillensis (see Figure 3c in the study by Konstantinou et al, 2000).…”

Section: Discussionsupporting

confidence: 90%

“…In relation to G. mincaronei , dermal denticles of G. piperatus had a similar shape and crown length at H1 (mean = 238.2 μm), B (mean = 309.3 μm), and C1 sites (mean = 896.7 μm) (Supporting Information: Table ). The C1 dermal denticles of G. mincaronei (Figure 11a) were similar to those of G. antillensis (see Figure 3c in the study by Konstantinou et al, 2000). Therefore, the dermal denticle pattern morphology is likely to be genus‐specific.…”

Section: Discussionsupporting

confidence: 74%

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Morphological pattern of the dermal denticles of the Southern sawtail catshark Galeus mincaronei Soto, 2001

Macías‐Cuyare

Oddone

2022

Journal of Morphology

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Dermal denticles cover the skin of sharks for protection and may have additional functions, depending on the environment. The aim of the present study was to analyze the morphological pattern of dermal denticles across the body of the poorly known deep-water catshark Galeus mincaronei, which is endemic to Southern Brazil.Additionally, we aimed to identify differences between sexes and stages of sexual maturity. For this purpose, we analyzed patches of eight skin samples from body regions, that is, the head, body, and tail. Dermal denticles were imaged using scanning electron microscopy. Measurements of crown morphological variations (length and width) and density of dermal denticles were performed. Nine characters of dermal denticle morphology were selected to describe a morphological pattern using principal component analysis (PCA). The first PCA axis explained 45.2% of the variation, the second explained 33%, and the third explained 14.3%, together explaining 92.5% of the total variation in denticle morphology. We identified three groups of dermal denticle crown morphologies and their possible functions. The first was composed of nostril and snout denticles, which might suggest abrasion strength functions; the second was composed of most body denticles, such as those in the cranium, on the left side of the body, and on the pectoral, dorsal, and caudal fins, which might be related to generalized functions; and the third was composed of only caudal crest denticles, which might indicate defense functions with hydrodynamic properties in G. mincaronei. Likewise, our results reveal variations in dermal denticle morphology and arrangement along the three maturity stages considered in both sexes. Similarly, sexual dimorphism in the crown width and morphology of dermal denticles was observed in developing and mature individuals. Our results are the first to reveal the morphological variation of dermal denticles in relation to function, sex, and ontogeny of individual G. mincaronei.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 74%

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Morphological pattern of the dermal denticles of the Southern sawtail catshark Galeus mincaronei Soto, 2001

Macías‐Cuyare

Oddone

2022

Journal of Morphology

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“…Sin embargo, el conocimiento científico sobre la biodiversidad en la región es limitado, siendo una de las zonas menos conocidas en cuanto a la descripción taxonómica de su biota (Alvarado et al 2008), como sucede con las poblaciones de condrictios. La mayoría de trabajos publicados se enfocan en especies del Atlántico noroccidental, del Golfo de México y del Caribe sur, y no así en el Caribe centroamericano (Hernández & Núñez, 1998;Konstantinou et al 2000;Baum et al 2003;Large et al 2003;Acevedo et al 2007;Caldas et al 2009a;Tavares, 2009).…”

Section: Introductionunclassified

Análisis de la población de condrictios (Vertebrata: Chondrichthyes) de aguas demersales y profundas del Caribe centroamericano, a partir de faenas de prospección pesquera con redes de arrastre

M¹,

R²,

A³

2014

Rev. Mar. Cost.

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Se describen la abundancia, riqueza, diversidad y distribución de las especies de condrictios de profundidad, capturadas en campaña de prospección pesquera del B/O Miguel Oliver en la plataforma y el talud continental de la costa Caribe de Centroamérica, entre el 3 de enero del 2011 y el 3 de febrero del 2011. Se utilizó una red tipo Lofoten para realizar arrastres de fondo de 30 minutos de duración cada uno, en 96 puntos de muestreo de los 25 transectos equidistantes. Se capturaron 28 especies, pertenecientes a 6 órdenes y 11 familias. Se describen 8 especies de rayas, 5 de quimeras y 15 de tiburones. La familia Squalidae mostró la mayor abundancia (n = 184), mayor riqueza (7 especies) y biomasa (222.6 kg, 58%), donde la especie dominante fue S. cubensis representada por un 37% en las capturas. El valor más alto del índice de diversidad de Shannon se obtuvo frente a las costas de Nicaragua (2.051). La distribución de las especies por temperatura y profundidad las ubica entre los 4 y 16ºC y entre los 20 y 1 000 m, respectivamente. Se reporta por primera vez en esta área la presencia de ocho especies: H.

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“…For elasmobranchs, this term has only been applied to few taxa, e.g. in catsharks [ 60 – 63 ], dogfishes [ 64 ], smooth-hounded sharks [ 65 ], hammerheads [ 66 ], eagle rays [ 67 ], and skates [ 68 ]. Some of those subspecies remain valid such as the smooth-hounded shark ( Mustelus canis canis and M. c. insularis ) and for several species of skates (from Genus Raja and Leucoraja ), while others were considered junior synonyms or have been elevated into distinct species [ 69 ].…”

Section: Discussionmentioning

confidence: 99%

Delimiting cryptic species within the brown-banded bamboo shark, Chiloscyllium punctatum in the Indo-Australian region with mitochondrial DNA and genome-wide SNP approaches

et al. 2021

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Background Delimiting cryptic species in elasmobranchs is a major challenge in modern taxonomy due the lack of available phenotypic features. Employing stand-alone genetics in splitting a cryptic species may prove problematic for further studies and for implementing conservation management. In this study, we examined mitochondrial DNA and genome-wide nuclear single nucleotide polymorphisms (SNPs) in the brown-banded bambooshark, Chiloscyllium punctatum to evaluate potential cryptic species and the species-population boundary in the group. Results Both mtDNA and SNP analyses showed potential delimitation within C. punctatum from the Indo-Australian region and consisted of four operational taxonomic units (OTUs), i.e. those from Indo-Malay region, the west coast of Sumatra, Lesser Sunda region, and the Australian region. Each OTU can be interpreted differently depending on available supporting information, either based on biological, ecological or geographical data. We found that SNP data provided more robust results than mtDNA data in determining the boundary between population and cryptic species. Conclusion To split a cryptic species complex and erect new species based purely on the results of genetic analyses is not recommended. The designation of new species needs supportive diagnostic morphological characters that allow for species recognition, as an inability to recognise individuals in the field creates difficulties for future research, management for conservation and fisheries purposes. Moreover, we recommend that future studies use a comprehensive sampling regime that encompasses the full range of a species complex. This approach would increase the likelihood of identification of operational taxonomic units rather than resulting in an incorrect designation of new species.

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The Systematics and Reproductive Biology of the Galeus arae Subspecific Complex (Chondrichthyes: Scyliorhinidae)

Cited by 8 publications

References 4 publications

Morphological pattern of the dermal denticles of the Southern sawtail catshark Galeus mincaronei Soto, 2001

Morphological pattern of the dermal denticles of the Southern sawtail catshark Galeus mincaronei Soto, 2001

Análisis de la población de condrictios (Vertebrata: Chondrichthyes) de aguas demersales y profundas del Caribe centroamericano, a partir de faenas de prospección pesquera con redes de arrastre

Delimiting cryptic species within the brown-banded bamboo shark, Chiloscyllium punctatum in the Indo-Australian region with mitochondrial DNA and genome-wide SNP approaches

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