| Schizoendemic taxa are vicariant endemics with identical chromosome numbers. |
| These taxa are subdivided generally on the basis of robustness of the premolars. |
| Unfortunately, no study so far has compared the variation in phenotypic characters among all taxa of the X. guttatus superspecies. |
| Conjugative plasmids can mediate gene transfer between bacterial taxa in diverse environments. |
| These taxa together form a paraphyletic group at the base of the clade of biramous arthropods. |
| These taxa consist of a broad array of organisms, including foraminifers, corals, bryozoans, mollusks, echinoderms, and fish. |
