Are the eggs -keptand fed by the mother -the ancestral form of reproduction in onychophorans?
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| Författarna: | , , |
|---|---|
| Materialtyp: | editorial |
| 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: | Repositorio UNA |
| Organisation: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| Språk: | Inglés |
| OAI Identifier: | oai:null:11056/26753 |
| Länkar: | http://hdl.handle.net/11056/26753 |
| Nyckelord: | OCCAM'S RAZOR LECITHOTROPIC VIVIPARITY MATROTROPHIC VIVIPARITY PLACENTAL VIVIPARITY PRESIONES EVOLUTIVAS REPRODUCCIÓN CON PLACENTA PARSIMONIA |