Are the eggs - kept and fed by the mother - the ancestral form of reproduction in onychophorans?
Sparad:
| Upphovsman: | |
|---|---|
| Materialtyp: | artículo original |
| Status: | Versión publicada |
| Utgivningstid: | 2019 |
| Beskrivning: | Onychophorans are the only phylum without current marine representatives and one of the few invertebrates with placenta. Here we propose that the common ancestor, which first emerged to the mainland in Pangea’s time, kept its eggs inside the female, feeding them continuously through a very thin shell (matrotrophic viviparity). Therefore, this mechanism is still common and widely distributed in onychophorans throughout the world: other mechanisms evolved locally in more recent times. |
| Land: | Portal de Revistas UCR |
| Organisation: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Språk: | Inglés Español |
| OAI Identifier: | oai:archivo.portal.ucr.ac.cr:article/36398 |
| Länkar: | https://archivo.revistas.ucr.ac.cr/index.php/rbt/article/view/36398 |
| Nyckelord: | parsimony Occam's razor lecithotropic viviparity matrotrophic viviparity placental viviparity evolutionary pressures reproduction with placenta parsimonia Navaja de Occam viviparismo lecitotrófico viviparismo matrotrófico viviparismo placentado presiones evolutivas reproducción con placenta |