Observations on Double-Yolked Eggs From the Domestic Fowl

Jeffrey, F. P.; Fox, Thomas W.; Smyth, J. Robert

doi:10.1093/oxfordjournals.jhered.a106397

Cited by 13 publications

(21 citation statements)

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“…Oviparity is a common strategy among vertebrates, but the character of multiple embryos per egg capsule appears to be quite rare, and is therefore novel. While there have been reported cases of twin embryos in chicken eggs (Jeffrey et al, 1953), some reptiles (Marion, 1980), their frequency and survivorship is extremely low (eg. <1% survivorship, Jeffrey et al, 1953), and therefore could not be considered a reproductive strategy, nor a shared tactic within a lineage.…”

Section: Discussionmentioning

confidence: 99%

“…While there have been reported cases of twin embryos in chicken eggs (Jeffrey et al, 1953), some reptiles (Marion, 1980), their frequency and survivorship is extremely low (eg. <1% survivorship, Jeffrey et al, 1953), and therefore could not be considered a reproductive strategy, nor a shared tactic within a lineage. It is unclear whether siblings within a capsule are clone mates, being derived from a single egg and sperm, or even if they are full siblings (i.e.…”

Section: Discussionmentioning

confidence: 99%

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The secret of the mermaid’s purse: Phylogenetic affinities within the Rajidae and the evolution of a novel reproductive strategy in skates

Chiquillo

Ebert

Slager

et al. 2014

Molecular Phylogenetics and Evolution

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The systematics of the skates in the family Rajidae have been contentious for over 250 years, with most studies inferring relationships among geographically clustered species, and non-overlapping taxa and data sets. Rajid skates are oviparous, and lay egg capsules with a single embryo. However, two species exhibit a derived form of egg laying, with multiple embryos per egg capsule. We provide a molecular assessment of the phylogenetic relationships of skates within the family Rajidae based on three mitochondrial genes. The resulting topology supports monophyly the family. However the genus Raja is polyphyletic, and several species assemblages need to be revised. We proposed a new assemblage as the Rostrorajini, which organizes rajid species into three well-supported tribal lineages for the first time. Further, these data provide an independent assessment of monophyly for the two species exhibiting multiple embryos per egg capsule, supporting their status as the unique genus Beringraja. In addition, we find that among the different size classes of egg capsules, ranging from 1–8 embryos per capsule in this genus, there is variation in frequency and survivorship. In Beringraja binoculata, the strategy of having two embryos per egg capsule occurs in the highest frequency and has the highest survivorship.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The secret of the mermaid’s purse: Phylogenetic affinities within the Rajidae and the evolution of a novel reproductive strategy in skates

Chiquillo

Ebert

Slager

et al. 2014

Molecular Phylogenetics and Evolution

View full text Add to dashboard Cite

show abstract

“…Single and double embryos died at different times of incubation. Sex ratio at 14 days and later was 44% males (P<0\m=.\02) for both types of embryo.The occurrence of live twin embryos is rare in chicken eggs (Nalbandov, 1942;Jeffrey, Fox & Smyth, 1953 …”

mentioning

confidence: 99%

“…The occurrence of live twin embryos is rare in chicken eggs (Nalbandov, 1942;Jeffrey, Fox & Smyth, 1953 …”

mentioning

confidence: 99%