Dental sexual dimorphism and morphology of Urotrygon microphthalmum

Rangel, Bianca de Sousa; Santander‐Neto, Jones; Rici, Rose Elí Grassi; Lessa, Rosângela

doi:10.1007/s00435-016-0312-0

Cited by 13 publications

(10 citation statements)

References 27 publications

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“…The higher and sharper mature male teeth are indeed assumed to function in grasping females and consequently to facilitate clasper introduction during copulation (Springer, 1966; McEachran, 1977; McCourt and Kerstitch, 1980; Cappetta, 1986; Ellis and Shackley, 1995; Kajiura and Tricas, 1996; Pratt Jr. and Carrier, 2001; Litvinov and Laptikhovsky, 2005; Gutteridge and Bennett, 2014). This feature has been recorded as a seasonal variation in the Atlantic stingray Dasyatis sabina (Kajiura and Tricas, 1996), while it is assumed to be a fixed‐in‐time feature in other elasmobranch species for which it has been described (Gutteridge and Bennett, 2014; de Sousa Rangel et al ., 2016). Gynandric heterodonty has also been only described at sexually mature stages, suggesting that sex‐hormone signals triggering the reproductive activity may also be involved in the development of the observed dental sexual dimorphism (McEachran, 1977; Cappetta, 1986; Snelson et al ., 1997; Powter et al ., 2010).…”

Section: Introductionmentioning

confidence: 99%

The intraspecific diversity of tooth morphology in the large‐spotted catshark Scyliorhinus stellaris: insights into the ontogenetic cues driving sexual dimorphism

et al. 2020

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The fantastic diversity of shark tooth shapes has been studied in relation to the evolutionary history and ecological traits of this iconic group (Bazzi et al., 2018). Functionally, convergent tooth shapes between the bonnethead sharks Sphyrna tiburo (Sphyrnidae) and horn sharks (Heterodontidae) were associated with the hard prey they feed on (Wilga and Motta, 2000). On the other hand, a strong phylogenetic signal arose from the analysis of the whole dentition of Lamniforms, which have a unique symphyseal to commissural toothtype patterning (Shimada, 2002, 2005). For this reason, tooth shape is one of the main supports for establishing taxonomic groups and phylogenetic relationships between fossil and extant elasmobranchs (sharks and batomorphs)

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Section: Introductionmentioning

confidence: 99%

The intraspecific diversity of tooth morphology in the large‐spotted catshark Scyliorhinus stellaris: insights into the ontogenetic cues driving sexual dimorphism

et al. 2020

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“…Greater insertion of teeth in the upper jaw in females is also observed in other species, whereas functional consequences remain unknown (Rangel et al 2016). Studies show that mature males can present great differentiation in relation to dentition, since changes may occur during the reproductive period (Gutteridge and Bennett 2014;Belleggia et al 2016;Rangel et al 2016). Such changes make male dentition more triangular and elongated.…”

Section: Discussionmentioning

confidence: 97%

“…Regarding sexes, differences in dentition were also observed, with females presenting more differentiated and heterogeneous teeth. Greater insertion of teeth in the upper jaw in females is also observed in other species, whereas functional consequences remain unknown (Rangel et al 2016). Studies show that mature males can present great differentiation in relation to dentition, since changes may occur during the reproductive period (Gutteridge and Bennett 2014;Belleggia et al 2016;Rangel et al 2016).…”

Section: Discussionmentioning

confidence: 98%

Notes on the occurrence and gender-based morphological aspects of Potamotrygon motoro (Elasmobranchii: Potamotrygonidae) in the complex of the Viana lake system- Maranhão, Brazil

Rincon

Pereira

Santos

et al. 2020

Rev. Nordestina Biol.

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The Brazilian Amazonian coast, extending from Amapá to Maranhão states, is drained by a series of small to medium sized rivers of the Amazon basin. The Pindaré-Mearim is an isolated basin formed by the junction of the Pindaré and Mearim rivers at its lower portion. Along the Pindaré and Mearim rivers there is a single reported species of freshwater stingray identified as Potamotrygon motoro. Although specimens have been deposited in research institutions, most of these specimens have been captured on the Amazon basin and its direct tributaries or along the Panará-Paraguay river basin. Hence, there is a severe lack of information on the P. motoro of the Pindaré- Mearim river basin. Here we present new data regarding P. motoro general morphology, emphasizing the color variation, sexual dimorphism and notes on its biological aspects.

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“…A mating season modification of teeth from flat (for crushing food) to needle-like teeth in males is known from several ray species, for example Dasyatis americana, Urolophus halleri and Urotrygon microphthalmum. This morphological modification of teeth is linked to mating behavior in these species (Chapman et al 2003;Nordell 1994;Rangel et al 2016). If similar reasons increase the number of upper tooth cusplets in males of E. spinax remain speculative.…”

Section: Intraspecific Dental Variationmentioning

confidence: 98%

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

Straube

Pollerspöck²

2020

Zoomorphology

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An important character on several taxonomic levels for shark identification is the tooth morphology. Sharks show a variety of highly specialized dentitions reflecting adaptations to their feeding habits. Intraspecific variation of tooth morphology such as sexual or ontogenetic dimorphism is poorly known in many species, even though tooth morphology plays a decisive role in the characterization of the fossil record of sharks, which comprises mostly fossil teeth. Here we analyzed the dentition of 40 jaws of the Velvet Belly Lantern Shark Etmopterus spinax and identified ontogenetic and sexual dimorphic characters such as total number of teeth, number of upper teeth, cusplet numbers in upper jaw teeth and width of lower jaw teeth. Dimorphic characters may reduce intraspecific competition for food, as E. spinax segregates by sex and size and may allow for identifying the male sex. The lower jaw tooth height, a sexually non-dimorphic character, was used to re-calculate the total length of specimens, which represents the first such approach for a squaliform shark. Results derived from the extant E. spinax are subsequently applied to fossil Etmopterus sp. teeth (Miocene) to gain individual information such as sex or size, but also characterize the extinct population from the excavation site by a size distribution profile in comparison to data from extant populations. This approach indicates the presence of multiple ontogenetic stages in the extinct population.

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Dental sexual dimorphism and morphology of Urotrygon microphthalmum

Cited by 13 publications

References 27 publications

The intraspecific diversity of tooth morphology in the large‐spotted catshark Scyliorhinus stellaris: insights into the ontogenetic cues driving sexual dimorphism

The intraspecific diversity of tooth morphology in the large‐spotted catshark Scyliorhinus stellaris: insights into the ontogenetic cues driving sexual dimorphism

Notes on the occurrence and gender-based morphological aspects of Potamotrygon motoro (Elasmobranchii: Potamotrygonidae) in the complex of the Viana lake system- Maranhão, Brazil

Intraspecific dental variations in the deep-sea shark Etmopterus spinax and their significance in the fossil record

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