Are the eggs -keptand fed by the mother -the ancestral form of reproduction in onychophorans?
Đã lưu trong:
| Nhiều tác giả: | , , |
|---|---|
| Định dạng: | editorial |
| Ngày xuất bản: | 2019 |
| Miêu tả: | 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. |
| Quốc gia: | Repositorio UNA |
| Tổ chức giáo dục: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| Ngôn ngữ: | Inglés |
| OAI Identifier: | oai:null:11056/26753 |
| Truy cập trực tuyến: | http://hdl.handle.net/11056/26753 |
| Từ khóa: | OCCAM'S RAZOR LECITHOTROPIC VIVIPARITY MATROTROPHIC VIVIPARITY PLACENTAL VIVIPARITY PRESIONES EVOLUTIVAS REPRODUCCIÓN CON PLACENTA PARSIMONIA |