The "viereckii" subspecies has spines that are rarely longer than 1 inch and 6 to 9 tuberculate ribs.
The "huastecensis" subspecie...Read Mores has spines that are up to about 4 inches long and 8 to 13 ribs.
The "morricalii" subspecies is spineless or nearly spineless and has 6 or 7 non-tubercled ribs.
The "viereckii" subspecies has spines that are rarely longer than 1 inch and 6 to 9 tuberculate ribs.
The "huastecensis" subspecie...Read More