Definition that contains type a
- lycopodium type and sole genus of the Lycopodiaceae; erect or creeping evergreen plants often used for Christmas decorations
- varanus type and sole extant genus of the Varanidae
- genus odontaspis type and sole genus of Carchariidae: sand sharks
- genus xenosaurus type and sole genus of Xenosauridae: slender-bodied Mexican lizards having the upper surface covered with tiny granules and tubercles
- esox type and only genus of the family Esocidae
- genus liopelma type and sole genus of the family Leiopelmatidae
- genus canna type and sole genus of the Cannaceae: perennial lily-like herbs of New World tropics
- clethra type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet
- sciadopitys type and sole genus of Sciadopityaceae; Japanese umbrella pines
- genus sphyraena type and sole genus of the Sphyraenidae: barracuda