Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae)
Morphology of extraembryonic membranes in the lizard Sceloporus aeneus was described from the modal time of oviposition (30-31) to advanced stages of retention (37) using light microscopy. At the normal stage of oviposition the choriovitelline membrane is present as in other oviparous species, moreo...
| Autors principals: | , , , , , |
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| Format: | Online |
| Idioma: | spa |
| Publicat: |
Instituto de Ecología, A.C.
2009
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| Accés en línia: | https://azm.ojs.inecol.mx/index.php/azm/article/view/638 |
| _version_ | 1799770059937153024 |
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| author | Castaños, Melody Villagrán, Maricela Rodríguez, Felipe Méndez, Fausto Hernández, Oswaldo Martínez, Andrés |
| author_facet | Castaños, Melody Villagrán, Maricela Rodríguez, Felipe Méndez, Fausto Hernández, Oswaldo Martínez, Andrés |
| author_sort | Castaños, Melody |
| collection | AZM |
| description | Morphology of extraembryonic membranes in the lizard Sceloporus aeneus was described from the modal time of oviposition (30-31) to advanced stages of retention (37) using light microscopy. At the normal stage of oviposition the choriovitelline membrane is present as in other oviparous species, moreover is replaced by the chorioallantoic membrane. At stages 34-37, the allantoic membrane extend beyond the equator of the egg where it contacts the bilaminar onphalopleure. Only in two specimens of stages 34 and 35, this membrane fully encircles the yolk sac. During egg retention, a regionally diversified chorioallantoic membrane was observed, having a thin squamous chorionic epithelia enveloping the embryonic hemisphere, and a cubic or cylindrical epithelia covering the abembryonic one. The bilaminar onphalopleure showed a cubic and cylindrical epithelia in the most advanced embryonic stages (35-37). We suggest that the chorioallantoic membrane plays a role in calcium and water transport towards the embryo, the later not causing any increase in volume of the egg inside the uterus. The persistence of the bilaminar onphalopleure in advanced stages of development may accomplish the same function of water and calcium transport during the interval of uterine egg retention, as it occurs in extraembryonic membranes of viviparous species within Reptilia. |
| format | Online |
| id | azm-article-638 |
| institution | Acta Zoológica Mexicana |
| language | spa |
| publishDate | 2009 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | azm-article-6382022-11-01T04:52:33Z Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) Histología de las membranas extraembrionarias durante la retención intrauterina en Sceloporus aeneus (Squamata: Phrynosomatidae) Castaños, Melody Villagrán, Maricela Rodríguez, Felipe Méndez, Fausto Hernández, Oswaldo Martínez, Andrés Histology extraembryonic membranes intrauterine egg retention Sceloporus aeneus viviparity. Histología membranas extraembrionarias retención intrauterina Sceloporus aeneus viviparidad. Morphology of extraembryonic membranes in the lizard Sceloporus aeneus was described from the modal time of oviposition (30-31) to advanced stages of retention (37) using light microscopy. At the normal stage of oviposition the choriovitelline membrane is present as in other oviparous species, moreover is replaced by the chorioallantoic membrane. At stages 34-37, the allantoic membrane extend beyond the equator of the egg where it contacts the bilaminar onphalopleure. Only in two specimens of stages 34 and 35, this membrane fully encircles the yolk sac. During egg retention, a regionally diversified chorioallantoic membrane was observed, having a thin squamous chorionic epithelia enveloping the embryonic hemisphere, and a cubic or cylindrical epithelia covering the abembryonic one. The bilaminar onphalopleure showed a cubic and cylindrical epithelia in the most advanced embryonic stages (35-37). We suggest that the chorioallantoic membrane plays a role in calcium and water transport towards the embryo, the later not causing any increase in volume of the egg inside the uterus. The persistence of the bilaminar onphalopleure in advanced stages of development may accomplish the same function of water and calcium transport during the interval of uterine egg retention, as it occurs in extraembryonic membranes of viviparous species within Reptilia. Se describió la morfología de las membranas extraembrionarias de la lagartija Sceloporus aeneus a partir del estadio de desarrollo embrionario normal a la oviposición (30-31) hasta estadios avanzados de retención (37) utilizando la microscopía de luz. En el estadio normal a la oviposición, la membrana coriovitelina está presente como en otras especies ovíparas, además es reemplazada por la membrana corioalantoidea. En los estadios 34-37, la membrana alantoidea se extiende más allá del ecuador del huevo donde contacta a la onfalopleura bilaminar, sólo en dos especimenes de los estadios 34 y 35, esta membrana rodea por completo al saco vitelino. Durante la retención intrauterina, se observó una membrana corioalantoidea regionalmente diversificada, teniendo un epitelio coriónico escamoso rodeando el hemisferio embrionario y un epitelio cúbico a cilíndrico cubriendo el abembrionario. La onfalopleura bilaminar mostró un epitelio cúbico a cilíndrico en la mayoría de los embriones de estadios avanzados (35-37). Sugerimos que la membrana corioalantoidea juega un papel importante en el transporte de calcio y agua hacia el embrión, ésta última sin provocar el incremento en el volumen del huevo dentro del útero. La persistencia de la onfalopleura bilaminar en estadios de desarrollo avanzados, puede desempeñar la misma función de transporte de agua y calcio durante el intervalo de retención intrauterina, como ocurre en las membranas extraembrionarias de especies vivíparas dentro de la clase Reptilia. Instituto de Ecología, A.C. 2009-08-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Original articles Artículos originales application/pdf https://azm.ojs.inecol.mx/index.php/azm/article/view/638 10.21829/azm.2009.252638 ACTA ZOOLÓGICA MEXICANA (N.S.); Vol. 25 No. 2 (2009); 303-314 ACTA ZOOLÓGICA MEXICANA (N.S.); Vol. 25 Núm. 2 (2009); 303-314 2448-8445 0065-1737 spa https://azm.ojs.inecol.mx/index.php/azm/article/view/638/808 Derechos de autor 2009 ACTA ZOOLÓGICA MEXICANA (N.S.) http://creativecommons.org/licenses/by-nc-sa/4.0 |
| spellingShingle | Castaños, Melody Villagrán, Maricela Rodríguez, Felipe Méndez, Fausto Hernández, Oswaldo Martínez, Andrés Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title | Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title_full | Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title_fullStr | Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title_full_unstemmed | Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title_short | Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae) |
| title_sort | histology of extraembryonic membranes during extended egg retention in sceloporus aeneus (squamata: phrynosomatidae) |
| url | https://azm.ojs.inecol.mx/index.php/azm/article/view/638 |
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