Functional implications of ontogenetic and sexual dimorphic dentition in the eastern shovelnose ray <i>Aptychotrema rostrata</i> (Shaw &amp; Nodder, 1794)

Gutteridge, Adrian N.; Bennett, Michael B.

doi:10.1242/jeb.089326

Cited by 17 publications

(20 citation statements)

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“…Herman et al 1995, Kemp 1999, Adnet & Cappetta 2001, Lamilla & Sáez 2003, Sáez & Lamilla 2012, and while most studies provide descriptions of tooth morphology (Du Buit 1978, Pequeño & Lamilla 1985, Leible 1987, Zorzi & Anderson 1988, Herman et al 1995, Delpiani et al 2012), relatively few address variation in tooth number and arrangement, mono-or dignathic heterodonty, malformation, dental sexual dimorphism and ontogenetic change or their relation to dietary intake (Bigelow & Schroeder 1953, Leible, 1988, Motta 2004, Gutteridge & Bennett 2014.…”

Section: Colourationmentioning

confidence: 99%

“…Sexually dimorphic dentition has been reported in Z. chilensis, with sharp and conical (spike-shaped) teeth in mature male skates, while females have blunt 'oval shaped' teeth (Leible 1987). Such sexual dimorphic dentition was hypothesised to correlate with different diets between the sexes in batoids (Feduccia & Slaughter 1974), but has since been shown to facilitate the male grasp of the female pectoral fins to aid in the act of copulation (McEachran 1977, Gutteridge & Bennett 2014. Although no further studies have been published regarding dental morphology or dental formulae for longnose skates in South America, both features are widely, if uncritically, used as diagnostic characters in cartilaginous fishes.…”

Section: Colourationmentioning

confidence: 99%

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A review of longnose skates Zearaja chilensis and Dipturus trachyderma

et al. 2015

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Longnose skates may have a high intrinsic vulnerability among fishes due to their large body size, slow growth rates and relatively low fecundity, and their exploitation as fisheries target-species places their populations under considerable pressure. These skates are found circumglobally in subtropical and temperate coastal waters. Although longnose skates have been recorded for over 150 years in South America, the ability to assess the status of these species is still compromised by critical knowledge gaps. Based on a review of 185 publications, a comparative synthesis of the biology and ecology was conducted on two commercially important elasmobranchs in South American waters, the yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma; in order to examine and compare their taxonomy, distribution, fisheries, feeding habitats, reproduction, growth and longevity. There has been a marked increase in the number of published studies for both species since 2000, and especially after 2005, although some research topics remain poorly understood. Considering the external morphological similarities of longnose skates, especially when juvenile, and the potential niche overlap in both, depth and latitude it is recommended that reproductive seasonality, connectivity and population structure be assessed to ensure their long-term sustainability.

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Section: Colourationmentioning

confidence: 99%

Section: Colourationmentioning

confidence: 99%

A review of longnose skates Zearaja chilensis and Dipturus trachyderma

et al. 2015

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“…Herman et al, 1995Herman et al, , 1996Kemp, 1999;Adnet & Cappetta, 2001;Lamilla & Sáez, 2003;Sáez & Lamilla, 2012), and while most studies provide descriptions of tooth morphology (Du Buit, 1978;Pequeño & Lamilla, 1985;Leible, 1987Leible, , 1988Zorzi & Anderson, 1988;Herman et al, 1995Herman et al, , 1996, relatively few address variation in tooth number and arrangement, mono-or dignathic heterodonty, malformation, dental sexual dimorphism and ontogenetic change or their relation to dietary intake (Bigelow & Schroeder, 1953;Leible, 1988;Motta, 2004;Gutteridge & Bennett, 2014;Belleggia et al, 2016).…”

Section: Dentitionmentioning

confidence: 99%

“…Sexually dimorphic dentition has been reported in Z. chilensis, with sharp and conical (spike-shaped) teeth in mature male skates, while females have blunt 'oval shaped' teeth (Leible, 1987;Sáez & Lamilla, 1997;Belleggia et al, 2016). Such sexual dimorphism dentition was hypothesised to correlate with different diets between the sexes in batoids (Feduccia & Slaughter, 1974), but has since shown to facilitate the male grasp of the female pectoral fins to aid in the act of copulation (McEachran, 1977;Gutteridge & Bennett, 2014). Although no further studies have been published regarding dental morphology or dental formulae for longnose skates in South America, both features are widely, if uncritically, used as diagnostic characters in cartilaginous fishes.…”

Section: Dentitionmentioning

confidence: 99%

“…In both skates and rays, a change dental morphology occurs as a secondary sexual characteristic that is related to the males' need to be able to firmly grip the females' pectoral fin in their mouth for mating (Kajiura & Tricas, 1996;Sáez & Lamilla, 1997;Gutteridge & Bennett, 2014;Belleggia et al, 2016;Delpiani et al, 2017). The change in jaw and dental morphology is presumably related, functionally to hypertrophy of the mandibular abductor muscle.…”

Section: Morphological Cues Of Longnose Skatesmentioning

confidence: 99%

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Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Vargas-Caro¹

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Longnose skates may be one of the most vulnerable taxa of elasmobranch fishes, with documented local extinctions and population declines worldwide. Longnose skates are the main component of the commercial elasmobranch fisheries in the south-east Pacific Ocean, especially in Chilean waters where target and bycatch fisheries have led two species to the brink of collapse. The yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma are endemic of southern South America yet little is known about population ecology and stock structure.Additionally, the external morphology of longnose skates is remarkably similar, especially in early life stages, and a lack of accurate species identification has compromised official landings records which in turn has impacted fishery management. Overall abundance of longnose skates has declined substantially over the last decade due to intensive fishing pressure and the fishery is considered to be `fully exploited'.Based on all available information in peer-reviewed and grey literature, a comparative synthesis of the biology and ecology was conducted on Z. chilensis and D. trachyderma. A positive increase in relation to scientific knowledge over the past decade was noticeable, although several basic aspects of their biology and ecology are still missing. There is an urgent need to fill knowledge gaps on, for example, movement patterns, feeding ecology and habitat use, population size and structure, and levels of connectivity. In this study, taxonomic clarity was provided, and relevant information with regard to the biology, ecology and fisheries that interact with longnose skates was collated.Confusion of identity between longnose skates occurs to the present day. In order to address this issue, morphometric and genetic tools are provided to aid in species identification of early-life stage specimens. Thirty-seven morphometric measurements and three meristic characters were used to identify specimens. These results suggest that the number of midline, nuchal and inter-dorsal thorns could be used to discriminate between specimens of Z. chilensis and D. trachyderma. Previously, the presence of a single nuchal thorn was considered to be a feature that could be used to separate species, however, this morphological feature has proven to be variable in Z. chilensis. Additionally, partial sequences of the 16S, cox1, nadh2 and the control regions of the mitochondrial DNA were amplified and analysed for intraspecific and interspecific divergence. Amplified fragments of cox1 gene and the control region contained information to separate the target species; however, specimens of D. trachyderma and Z. chilensis were grouped indistinctly within a single clade using 16S and nadh2 fragments.-iiiThe evolutionary history of Zearaja was also explored, in a broad taxonomic context by using whole mitochondrial genomes (mitogenomes) to understand higher-level phylogenetic relationships among batoids. A data set of 56 mitogenomes of 47 batoids and four outgroups was analysed. O...

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Devil rays (Chondrichthyes: Mobula) of the Arabian Seas, with a redescription of Mobula kuhlii (Valenciennes in Müller and Henle, 1841)

Sciara

Fernando

Adnet

et al. 2016

Aquatic Conservation

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ABSTRACT1. Devil rays (genus Mobula) are pelagic elasmobranchs widely distributed throughout tropical, subtropical and warm-temperate waters. Their occurrence and distribution remains poorly documented in the Arabian Seas region. A review is provided of species occurrence in these water bodies along with a synthesis of regional information on their biology and ecology.2. Based on the available evidence, five Mobula species occur in the region (M. eregoodootenkee, M. japanica, M. kuhlii, M. tarapacana, and M. thurstoni). Of these, three (M. eregoodootenkee, M. tarapacana and M. thurstoni) were found to occur in the Red Sea, and three (M. eregoodootenkee, M. japanica, and M. kuhlii) were found to occur in the Arabian/Persian Gulf. Mobula japanica and M. kuhlii are reported here for the first time in Gulf waters. All five species were found in the Indian Ocean waters between the Gulf of Aden and Pakistan.3. To address the still uncertain taxonomy of M. kuhlii, a redescription of this species is provided based on a sample of fresh specimen material.4. Mobula diabolus is a nomen ambiguum, never used to unambiguously designate any newly described species, and its use should be avoided.5. Considering the life-history traits that make these species particularly vulnerable to fishing pressure, current levels of exploitation in by-catch fisheries are unlikely to be sustainable, despite the fact that the trade in gill plates does not seem to be prevalent in this region. Critical knowledge gaps unfortunately still exist, crippling effective management and conservation actions.

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Functional implications of ontogenetic and sexual dimorphic dentition in the eastern shovelnose ray Aptychotrema rostrata (Shaw & Nodder, 1794)

Cited by 17 publications

References 37 publications

A review of longnose skates Zearaja chilensis and Dipturus trachyderma

A review of longnose skates Zearaja chilensis and Dipturus trachyderma

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Devil rays (Chondrichthyes: Mobula) of the Arabian Seas, with a redescription of Mobula kuhlii (Valenciennes in Müller and Henle, 1841)

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