From the Latin for "4-footed", it's an animal with 4 feet
... with its metaphorical link to "knowing" and "seeing" the light, and with 
that the... [DOC] [TLE] Ichthyostega - Wikipedia [PAR] Ichthyostega (Greek: "fish roof") is an early tetrapod genus that lived at the end of 
the Upper ... Ichthyostega's skull seems more fish-like than that of Acanthostega, 
but its girdle ... Acanthostega which had feet with eight digits,; Ichthyostega with 
limbs.