It was inspired by tapering shapes of oceanic swordfish. It's a three box sedan, five doors and great habitability.
At the 1984 Turin Motor show Italdesign propose two different architectural solutions for berline and space-wagon, using the same chassis, Orca's one.
Marlin's complete length is the same of the Lancia Thema and Saab (4600 mm) but the bodywork is really more tapered to reach a 0,21 cx, thanks to the large front, deceiving windscreen and rear window and continuous section between glasses and side of the car.
The roof is glassed with lateral windows which makes a transparent dome that allows a 360° visibility from the inside.
The steering wheel is similar to Medusa and Orca's one, with central controls, while the equipment is both analogical and digital.