Microscopic structure of the egg capsule of Atlantoraja cyclophora (Elasmobranchii: Rajidae: Arhynchobatinae)

Oddone, María Cristina

doi:10.1590/s1676-06032005000300020

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…Elasmobranch egg capsules, which consist of a multilaminated proteinic matrix, are secreted by the nidamental gland and then laid in the marine environment (Oddone 2005). P. scobina displays simple oviparity, since only one egg capsule per uterus can be found.…”

Section: Discussionmentioning

confidence: 99%

Egg capsules of the raspthorn sandskate, Psammobatis scobina (Philippi, 1857) (Rajiformes, Rajidae)

Concha¹,

Hernández

Oddone³

2009

Rev. biol. mar. oceanogr.

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Resumen.-En diciembre de 2005 se recolectaron cápsulas ovígeras de dos hembras de Psammobatis scobina, capturadas en Caleta Montemar, Chile central (32º57'S-71º33'W). La superficie de las cápsulas fue suave y finamente estriada, de color café y translúcida. Además presentaron la típica forma de barril. La longitud central fluctuó entre 35,25 mm y 38,45 mm y su ancho varió entre 25,91 mm y 27,94 mm. La cara dorsal es convexa con respecto a la ventral. Los cuernos anteriores son más cortos que los posteriores, se orientan hacia el interior y se estrechan hasta adquirir forma de zarcillos hacia las puntas. Los zarcillos laterales resultaron ser un carácter diagnóstico entre especies del mismo género en Chile. Esta es la primera descripción de las cápsulas ovígeras de P. scobina, especie endémica para las costas del sur de Sudamérica.

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Section: Discussionmentioning

confidence: 99%

Egg capsules of the raspthorn sandskate, Psammobatis scobina (Philippi, 1857) (Rajiformes, Rajidae)

Concha¹,

Hernández

Oddone³

2009

Rev. biol. mar. oceanogr.

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“…According to the latter cited author, the capsules of the species that have to withstand long incubation periods in sea water (occurring in deeper areas), developed more sophisticated configurations of the capsule surfaces, which would protect the egg mechanically from natural dangers and predators during such period of incubation. The egg capsules of A. platana and A. cyclophora, for instance, have striated surfaces that make them rough to the touch and microscopically markedly corrugated Oddone, 2005). In southern Brazil, specimens of A. cyclophora and A. platana are found at depths of up to 300 m and temperatures ranging between 10.0°C and 17.6°C (Vooren, 1997;Oddone & Vooren, 2004).…”

Section: Discussionmentioning

confidence: 99%

Change in size-at-maturity of the yellownose skate Dipturus chilensis (Guichenot, 1848) (Elasmobranchii: Rajidae) in the SW Atlantic

Paesch

Oddone

2008

Neotrop. ichthyol.

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A total of 3518 specimens (1607 males, 1911 females) of Dipturus chilensis were sampled. Males ranged from 44.0 to 99.0 cm and females from 45.0 to 110.0 cm. Total length composition of the grouped catches differed significantly among sexes, with females being larger than males. The sex ratio favored the females. The total length at which 50% of the specimens were retained by the gear was 69.0 cm for the males and 73.0 cm for the females. A sub-sample of 124 specimens (48 males, 76 females) was analyzed for reproductive assessment. For the males, size at 50% maturity was estimated at 78.5 cm, while for the females this parameter was estimated at 81.4 cm. Preliminary observations on the description of the egg capsules are also provided.
Um total de 3518 espécimes (1607 machos e 1911 fêmeas) de Dipturus chilensis foi amostrado. Os machos tiveram comprimentos totais entre 44.0 e 99.0 cm e as fêmeas entre 45.0 e 110.0 cm. A composição de comprimentos totais das capturas agrupadas foi significativamente diferente entre ambos os sexos, sendo as fêmeas maiores do que os machos. A razão sexual favoreceu as fêmeas. O comprimento total em que 50% dos espécimes foram retidos pelo aparelho de pesca foi de 69.0 cm nos machos e de 73.0 cm nas fêmeas. Uma sub-amostra de 124 espécimes (48 machos e 76 fêmeas) foi analisada para avaliação dos parâmetros reprodutivos. Para os machos, o tamanho de 50% de maturidade resultou em 78.5 cm enquanto que para as fêmeas este parâmetro foi estimado em 81.4 cm. Observações preliminares sobre a descrição da cápsula ovígera são também fornecidas

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“…In spite of the fact that chondrichthyan catches in the south‐west Atlantic Ocean have considerably increased in recent years (Massa et al , 2004; Cousseau et al , 2007), several aspects of their reproductive biology are yet unknown. Egg cases have been described for some skates in the south‐western Atlantic Ocean (Braccini & Chiaramonte, 2002; Mabragaña et al , 2002; Oddone & Vooren, 2002, 2005, 2008; Mabragaña & Cousseau, 2004; Oddone et al , 2004, 2006; Oddone, 2005; San Martín et al , 2005; Ruocco et al , 2006; Mabragaña, 2007; Concha et al , 2009). Two of these works include an identification key based on egg‐case morphology of species of Psammobatis Günther 1870 (Mabragaña, 2007), and of species of Atlantoraja Menni 1872, Sympterygia Müller & Henle 1837 and Rioraja Whitley 1939 (Oddone & Vooren, 2008); however, a comparative study including capsules morphology and morphometry of all chondricthyan genera occurring in the area is lacking.…”

Section: Introductionmentioning

confidence: 99%

Chondrichthyan egg cases from the south‐west Atlantic Ocean

Mabragaña

Figueroa

Scenna

et al. 2011

Journal of Fish Biology

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Egg cases of 21 oviparous chondrichthyan species from the south-west Atlantic Ocean are described and compared. The catshark Schroederichthys bivius has a cigar-shaped egg case with curled tendrils only at the posterior end. Egg cases of the elephant fish Callorhinchus callorynchus are spindle-shaped with anterior and posterior tubular extensions and lateral flanges. The skate Amblyraja doellojuradoi presents medium-sized egg cases (71 mm in length) with a lateral keel extending to the first portion of the horns. The endemic skate species of the genus Atlantoraja have medium to large egg cases (69-104 mm in length) and present relatively large posterior horns. Egg cases of the genus Bathyraja have a medium size, 75-98 mm in length, and are characterized by a very similar morphology, a relatively smooth to rough surface case and posterior horns strongly curved inwards. Egg cases of the genera Dipturus and Zearaja are very large, 115-230 mm in length, and have a well-developed posterior apron. Despite the problematical identification of skates at species level, the egg capsules of the endemic genus Psammobatis are easily diagnosed; the capsules are small (25-53 mm in length), those of Psammobatis rutrum being the smallest known to date in the world. Egg cases of Rioraja agassizi have a medium size, 61-68 mm in length, relatively straight sides, a smooth surface and silky attachment fibres placed in the lateral keel next to each horn. Those of the genus Sympterygia are small to medium sized, 51-86 mm in length, and display the thickest lateral keel and the longest posterior horns among the skates of the world. Egg cases can be a useful tool for identifying species and egg-laying areas; therefore, a provisional key for the south-west Atlantic Ocean chondrichthyan capsules is presented.

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Microscopic structure of the egg capsule of Atlantoraja cyclophora (Elasmobranchii: Rajidae: Arhynchobatinae)

Cited by 7 publications

References 8 publications

Egg capsules of the raspthorn sandskate, Psammobatis scobina (Philippi, 1857) (Rajiformes, Rajidae)

Egg capsules of the raspthorn sandskate, Psammobatis scobina (Philippi, 1857) (Rajiformes, Rajidae)

Change in size-at-maturity of the yellownose skate Dipturus chilensis (Guichenot, 1848) (Elasmobranchii: Rajidae) in the SW Atlantic

Chondrichthyan egg cases from the south‐west Atlantic Ocean

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