Template:Nested taxon list
Usage
Pass parameters in triplets:
First parameter: Name of the higher-order taxon, e.g. "Suborder Chelodina"
Second parameter: Authority of the higher-order taxon, e.g. Smith 1889. (Leave blank if unknown)
Third parameter: A list of taxa within the higher-order taxon, probably generated using Template:Species list or {{taxon list}}.
[Fourth parameter: first parameter of next triplet; ...]
To collapse the template at the first level, use Template:Collapsible taxon list as opposed to Template:Nested taxon list.