Definition that contains type a
- lycopodium type and sole genus of the Lycopodiaceae; erect or creeping evergreen plants often used for Christmas decorations
- genus clethra type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet
- genus sparganium type and sole genus of Sparganiaceae; marsh or aquatic herbs of temperate regions
- sphyraena type and sole genus of the Sphyraenidae: barracuda
- genus welwitchia type and sole genus of Welwitschiaceae
- tyto type and only genus of the family Tytonidae
- genus tarsius type and sole genus of the family Tarsiidae
- genus schizosaccharomyces type and only genus of Schizosaccharomycetaceae; comprises the fission yeasts
- genus albula type and sole genus of the family Albulidae
- antilocapra type and sole genus of the Antilocapridae comprising one species