Egg Capsules of Schroederichthys tenuis and Scyliorhinus haeckelii (Chondrichthyes, Scyliorhinidae)

Gomes, Ulisses Leite; Carvalho, Marcelo R. de

doi:10.2307/1446823

Cited by 21 publications

(28 citation statements)

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“…Egg capsules of the narrowtail catshark Schroederichthys maculatus Springer 1966, the slender catshark Schroederichthys tenuis Springer 1966 and the redspotted catshark. Schroederichthys chilensis (Guichenot 1848) have been previously described (Springer, 1979; Gomes & de Carvalho, 1995; Hernández et al , 2005). The egg cases of the genus Schroederichthys lack the typically coiled anterior tendrils of the family Scyliorhinidae.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…Treude et al 2011). Similar in outline are the egg capsules of two species of the genus Schroederichthys (S. tenuis and S. maculatus), but on their surfaces the egg capsules show only tortuous longitudinal striations (Springer 1966;Gomes and de Carvalho 1995) instead of strong ribs as in the Bear River specimens.…”

Section: Genus Scyliorhinotheca Novmentioning

confidence: 93%

A Late Devonian Hydrocarbon-Seep Deposit Dominated by Dimerelloid Brachiopods, Morocco

Peckmann¹,

Campbell²,

Walliser³

et al. 2007

PALAIOS

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“…No obstante, debido a las malas condiciones en las cuales estaba preservada se destrozaron al ser manipuladas, y no se pudo realizar un análisis más fino. Junto a la cápsula de Schroederichthys tenius descrita por Gomes (1995), las cuatro especies del género Schroederichthys presentarían un patrón similar del género, respecto a la morfología externa de las cápsulas de huevo y las prolongaciones anteriores y posteriores. Las prolongaciones anteriores son medianamente largas e hilachentas y las prolongaciones posteriores son largas y notoriamente espiraladas.…”

Section: Resultsunclassified

DESARROLLO EMBRIONARIO DE LA PINTARROJA COMUN Schroederichthys chilensis (Guichenot, 1848) (CHONDRICHTHYES: SCYLIORHINIDAE)

et al. 2005

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RESUMENEl presente estudio describe el desarrollo embrionario de la pintarroja común Schroederichthys chilensis, a través de observaciones de la morfología externa de la cápsula, morfología del embrión y mediciones del tiempo de gestación. Se recolectaron 60 cápsulas de huevos en la localidad de Chungungo (IV Región). Además se obtuvieron dos cápsulas desovadas por una hembra mantenida en cautiverio. Las cápsulas fueron descritas basándose en mediciones morfométricas, coloración, textura y presencia de las fisuras respiratorias. Para la determinación y descripción de la morfología embrionaria se utilizaron embriones extraídos de las cápsulas recolectadas. Para la determinación del tiempo de gestación se observaron continuamente 15 cápsulas con embriones vivos, a través de una ventana transparente en la pared de cada cápsula. Las cápsulas de huevos son rectangulares y tienen dos prolongaciones anteriores llamadas "filamentos del ovisaco" y dos posteriores llamadas "zarcillos". Las cápsulas recientemente desovadas son de coloración parda o verde opaco, textura parcialmente lisa y pegajosa y las fisuras respiratorias están selladas. Sin embargo, las cápsulas con embriones en estados avanzados son de coloración café oscura opaca, textura lisa y las fisuras respiratorias están abiertas. Se establecieron 6 estados de desarrollo embrionario en base a los siguientes caracteres diagnósticos: saco vitelino sin embrión, aperturas faríngeas, filamentos branquiales, diferenciación de las aletas desde el pliegue dorsal y ventral, espinas en la cola, hilera de espinas dorsales y pigmentación. El tiempo de gestación es de 211 días a una temperatura entre 11,1-15,8º C. PALABRAS CLAVES: Desarrollo, embriones, cápsulas de huevos, pintarroja, Chile. ABSTRACTThe present study describes the embrionary development of the redspotted shark, Schroederichthys chilensis, through observations of the external morphology of the eggs capsules, embryo morphology and measurement of gestation time. Sixty egg capsules were collected in the locality of Chungungo (IV Region, Chile). Two additional capsules were laid by a female kept in captivity. Eggs capsules were described based on morphometric measurements, coloration, texture and presence of respiratory fissures. For the determination and description of the embryonic morphology, embryos extracted from the collected capsules. For the determination of the gestation time 15 capsules with alive embryos were observed through a transparent window on the wall of each capsule. The eggs capsules are rectangular and they have two anterior prolongation called "filaments ovisac" and two posterior called "tendrils". The recently eggs capsules laid are brown or green opaque in coloration, partially smooth and sticky in texture and closed respiratory fissures. The eggs capsules with embryos in advanced stages are dark brown, flat texture and respiratory fissures open. Six stages of embrionary development were determined on the basis of the following diagnostic characters: viteline sac without embryo, pharyngea...

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Egg Capsules of Schroederichthys tenuis and Scyliorhinus haeckelii (Chondrichthyes, Scyliorhinidae)

Cited by 21 publications

References 0 publications

Chondrichthyan egg cases from the south‐west Atlantic Ocean

Chondrichthyan egg cases from the south‐west Atlantic Ocean

A Late Devonian Hydrocarbon-Seep Deposit Dominated by Dimerelloid Brachiopods, Morocco

DESARROLLO EMBRIONARIO DE LA PINTARROJA COMUN Schroederichthys chilensis (Guichenot, 1848) (CHONDRICHTHYES: SCYLIORHINIDAE)

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