WordNet
- having no placenta; "monotremes and marsupials are aplacental mammals"
English Journal
- Biological observations on the bristly catshark Bythaelurus hispidus from deep waters off the south-west coast of India.
- Akhilesh KV, White WT, Bineesh KK, Ganga U, Pillai NG.Author information Central Marine Fisheries Research Institute, P. O. Box 1603, Ernakulam North, Kochi, 682018 Kerala, India. akhikv@gmail.comAbstractBiological data are presented for the poorly known bristly catshark Bythaelurus hispidus based on specimens collected from the by-catch of the commercial deep-sea shrimp trawl fishery operating in the Arabian Sea at depths of 200-500 m off the south-west coast of India. One hundred and sixty-two individuals, which ranged from 120 to 366 mm total length (L(T)), were collected for this study. Size-at-maturity (L₅₀) for females and males was estimated at 252 and 235 mm L(T), respectively. The reproductive mode of B. hispidus was aplacental viviparity, which is the rarest reproductive mode within the Scyliorhinidae and is considered to be the most advanced of the three reproductive modes occurring within this family. Dietary analysis of stomach contents revealed B. hispidus feeds on a variety of prey, primarily fishes.
- Journal of fish biology.J Fish Biol.2013 May;82(5):1582-91. doi: 10.1111/jfb.12087.
- Biological data are presented for the poorly known bristly catshark Bythaelurus hispidus based on specimens collected from the by-catch of the commercial deep-sea shrimp trawl fishery operating in the Arabian Sea at depths of 200-500 m off the south-west coast of India. One hundred and sixty-two i
- PMID 23639155
- Genetic divergence, speciation and biogeography of Mustelus (sharks) in the central Indo-Pacific and Australasia.
- Boomer JJ, Harcourt RG, Francis MP, Stow AJ.Author information Department of Biological Sciences, Macquarie University, NSW 2109, Australia. jessica.boomer@mq.edu.auAbstractThe shark genus Mustelus is speciose, commercially important and systematically troublesome. We use a molecular approach combining inter and intra-specific data to investigate Mustelus species in the central Indo-Pacific and Australasia. Our analysis supports two Mustelus clades, one comprising species with no white spots and a placental reproductive mode and a second clade of white spotted, aplacental species. Levels of genetic divergence are low, especially among species in the white spotted, aplacental clade and this should be taken into account when employing molecular data to delineate species. Our data support the hypothesis of a radiation following dispersal from a northern hemisphere ancestor. Molecular dating suggests that localised speciation in Australasia may have occurred during the Pleistocene. We propose that some of the difficulties associated with Mustelus systematics relate to a recent radiation, particularly in the Australasian region.
- Molecular phylogenetics and evolution.Mol Phylogenet Evol.2012 Sep;64(3):697-703. doi: 10.1016/j.ympev.2012.05.024. Epub 2012 Jun 1.
- The shark genus Mustelus is speciose, commercially important and systematically troublesome. We use a molecular approach combining inter and intra-specific data to investigate Mustelus species in the central Indo-Pacific and Australasia. Our analysis supports two Mustelus clades, one comprising spec
- PMID 22659513
- Effects of nonylphenol on vitellogenin synthesis in adult males of the spotted ray Torpedo marmorata.
- Del Giudice G, Prisco M, Agnese M, Verderame M, Rosati L, Limatola E, Andreuccetti P.Author information Department of Biological Sciences, Evolutionary and Comparative Biology Division, University of Naples Federico II, Naples, Italy.AbstractThe aim of this investigation was to assess the effects of nonylphenol (NP), an oestrogen-like environmental pollutant, on the vitellogenin (VTG) synthesis in adult males of the aplacental viviparous cartilaginous fish Torpedo marmorata. The VTG recovery in males is considered a biomarker of xeno-oestrogenic pollution as this lipophosphoglycoprotein is physiologically induced by oestrogens only in females of oviparous and ovoviparous vertebrates. Using in situ hybridization and immunohistochemistry, T. marmorata males injected with nonylphenol showed the presence of VTG in the liver and the kidney. In particular, vtg messenger (m)RNA and VTG protein were expressed in the liver, whereas in the kidney cells only the presence of VTG was recorded. By contrast, no expression for VTG was detected in the testis. These results demonstrate that in T. marmorata NP induces the expression of vtg only in the liver; the presence of VTG in the kidney and its absence in the testis are discussed.
- Journal of fish biology.J Fish Biol.2012 Apr;80(5):2112-21. doi: 10.1111/j.1095-8649.2011.03172.x. Epub 2012 Jan 5.
- The aim of this investigation was to assess the effects of nonylphenol (NP), an oestrogen-like environmental pollutant, on the vitellogenin (VTG) synthesis in adult males of the aplacental viviparous cartilaginous fish Torpedo marmorata. The VTG recovery in males is considered a biomarker of xeno-oe
- PMID 22497418
Japanese Journal
- A new class of DNA photolyases present in various organisms including aplacental animals
- EMBO J. 13, 6143-6151, 1994
- NAID 80008027972
Related Links
- Aplacental definition, having or forming no placenta, as the marsupials and monotremes. See more. Thesaurus Translate Puzzles & Games Reference Word of the Day Blog Slideshows Apps by Dictionary My Account Log Out ...
- a·pla·cen·tal (ā′plə-sĕn′tl) adj. Having no placenta. aplacental [a″plah-sen´t'l] having no placenta. aplacental having no placenta. a·pla·cen·tal (ā'pla-sen'tăl), Without a placenta; denoting the monotremes (which lay eggs and have no ...
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