Tailwheel airplanes are still same category and class--Single Engine Land. Here is the requirement for an endorsement to operate them: (i) Additional training required for operating tailwheel airplanes. (1) Except as provided in paragraph (i)(2) of this section, no person may act as pilot in command of a tailwheel airplane unless that person has received and logged flight training from an authorized instructor in a tailwheel airplane and received an endorsement in the person's logbook from an authorized instructor who found the person proficient in the operation of a tailwheel airplane. The flight training must include at least the following maneuvers and procedures:
(i) Normal and crosswind takeoffs and landings;
(ii) Wheel landings (unless the manufacturer has recommended against such landings); and
(iii) Go-around procedures.
But, this is NOT a "type rating" as defined in the regulations.
Here's the regulation pertaining to Recency:
§ 61.57 Recent flight experience: Pilot in command.
(a) General experience. (1) Except as provided in paragraph (e) of this section, no person may act as a pilot in command of an aircraft carrying passengers or of an aircraft certificated for more than one pilot flight crewmember unless that person has made at least three takeoffs and three landings within the preceding 90 days, and—
(i) The person acted as the sole manipulator of the flight controls; and
(ii) The required takeoffs and landings were performed in an aircraft of the same category, class, and type (if a type rating is required), and, if the aircraft to be flown is an airplane with a tailwheel, the takeoffs and landings must have been made to a full stop in an airplane with a tailwheel.
Note that this says the airplane must be of the same category, class and type, if a type rating is required. Type ratings are required for all turbojet powered aircraft, all aircraft over 12,500 pounds AUW and other airplanes specified by the administrator.
This regulation specifically implies that a tailwheel in and of itself does not constitute a type rating or a different category or class of aircraft.
Category is "Airplane". Class in this case is "Single Engine, Land" or "Multi Engine, Land", or Multi Engine Sea, etc.
So a super cub by definition is an Airplane, Single engine, land category and class. According to the regs, you have to have an instructors endorsement to fly a tailwheel airplane, and according to 61.57, you must have logged three landings within 90 days to a full stop in a tailwheel airplane to be current.
If you landed a Grumman Goose three times on land within 90 days, that does NOT qualify as recent experience for flying a Super Cub. The Goose is an "Airplane, Multi-Engine Land or Sea" airplane, and therefore a different CLASS (Multi Engine) than the Super Cub.
In any case, the Skycatcher is indeed an Airplane, Single Engine Land machine. Anyone with an appropriate PPL and single engine land privileges on his or her certificate can fly it with no further ado.