Animals in this category are put here based on theoretical molecular sequencing meant to determine which opening from an earlier, more simple, state developed into the mouth, and which developed into the Anus. Oddly enough this classification includes sea cucumbers who possess a single orafice for digestive, respiratory, and reproducive means.
This category has the following 2 subcategories, out of 2 total.
Pages in category "Deuterostomia"
The following 25 pages are in this category, out of 25 total.