Egg capsules of the little skate, Psammobatis extenta (Garman, 1913) (Chondrichthyes, Rajidae)

Rocha, Fernanda Cipriano; Oddone, María Cristina; Gadig, Otto Bismarck Fazzano

doi:10.1590/s1679-87592010000300008

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…() described the egg capsules of P. scobina (Philippi 1857) and Rocha et al . () did the same for P. extenta . Variation in colour, as well as curved anterior horns and tendril‐like tips of the posterior horns seem to be similar among the genus Psammobatis (Mabragaña & Cousseau, ; Concha et al, ).…”

Section: Discussionmentioning

confidence: 69%

“…Egg capsules have taxonomic value due to their species-specific morphology (Ishiyama, 1958) although little is known about morphometric variation of these structures. Concha et al (2009) described the egg capsules of P. scobina (Philippi 1857) and Rocha et al (2010) did the same for P. extenta. Variation in colour, as well as curved anterior horns and tendril-like tips of the posterior horns seem to be similar among the genus Psammobatis (Mabragaña & Cousseau, 2004;Concha et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…() provided information about population structure and reproductive biology of P. extenta from south‐eastern Brazil; Rocha et al . () described the egg capsule morphology of the same species. Despite these studies, there are still species of Psammobatis whose biology remains unknown, such as P. rutrum .…”

Section: Introductionmentioning

confidence: 99%

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Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south‐west Atlantic

Martins

Oddone

2017

Journal of Fish Biology

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This study presents information on the reproductive biology of Psammobatis rutrum based on 55 males and 53 females obtained as by-catch from bottom trawlers off southern Brazil during July 2013 and September 2014 and includes a detailed description of the egg capsule. Total lengths (L ) ranged from 22·3 to 31·6 cm and most of the sample comprised larger individuals, although there were no sexual differences in length-frequency distributions. Significant sexual differences were found for total length-disc width, L -body mass and L -eviscerated body mass relationships, with females being heavier and larger. Males started to mature at 25·5 cm L and females, at 25·9 cm L , while L at maturity was calculated in 26·67 and 26·81 cm, respectively. Attaining larger sizes and mass may represent a reproductive investment for females, as observed in other rajoid species. Egg bearing females were first observed over 27·1 cm L and ovarian fecundity was 1-12 vitellogenic follicles. The egg capsules were 2·22-2·62 cm length and had attaching fibrils on both lateral sides. Microscopically, the ventral face of the egg capsule was rougher than the dorsal face.

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

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Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south‐west Atlantic

Martins

Oddone

2017

Journal of Fish Biology

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Biocomposites and Mineralized Tissues

Ehrlich

2014

Biologically-Inspired Systems

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Interspecific Differences in the Flow Regimes and Drag of North Pacific Skate Egg Cases

Hall

Elcock

Hoff

et al. 2022

Integrative and Comparative Biology

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Skates are a diverse group of dorso-ventrally compressed cartilaginous fishes found primarily in high-latitude seas. These slow-growing oviparous fishes deposit their fertilized eggs into cases, which then rest on the seafloor. Developing skates remain in their cases for 1-4 years after they are deposited, meaning the abiotic characteristics of the deposition sites, such as current and substrate type, must interact with the capsule in a way to promote long residency. Egg cases are morphologically variable and can be identified to species. Both the gross morphology and the microstructures of the egg case interact with substrate to determine how well a case stays in place on a current-swept seafloor. Our study investigated the egg case hydrodynamics of eight North Pacific skate species to understand how their morphology affects their ability to stay in place. We used a flume to measure maximum current velocity, or “break-away velocity,” each egg case could withstand before being swept off the substrate and a tilt table to measure the coefficient of static friction between each case and the substrate. We also used the programming software R to calculate theoretical drag on the egg cases of each species. For all flume trials, we found the morphology of egg cases and their orientation to flow to be significantly correlated with break-away velocity. In certain species, the morphology of the egg case was correlated with flow rate required to dislodge a case from the substrate in addition to the drag experienced in both the theoretical and flume experiments. These results effectively measure how well the egg cases of different species remain stationary in a similar habitat. Parsing out attachment biases and discrepancies in flow regimes of egg cases allows us to identify where we are likely to find other elusive species nursery sites. These results will aid predictive models for locating new nursery habitats and protective policies for avoiding the destruction of these nursery sites.

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Egg capsules of the little skate, Psammobatis extenta (Garman, 1913) (Chondrichthyes, Rajidae)

Cited by 4 publications

References 14 publications

Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south‐west Atlantic

Reproductive biology of Psammobatis rutrum (Chondrichthyes: Arhynchobatidae) in south Brazil, south‐west Atlantic

Biocomposites and Mineralized Tissues

Interspecific Differences in the Flow Regimes and Drag of North Pacific Skate Egg Cases

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