It was described in 1988 based on juvenile specimens, all with a body length under 90mm.
As mentioned before, the skull is only known in small, juvenile specimens.
Juvenile specimens were lacking in summer and early fall collections.
Even the bite of a juvenile specimen can be fatal.
In 2008 gastroliths present with all three juvenile specimens were described.
However, Darwin did have four live juvenile specimens to compare from different islands.
Although some Dimetrodon species could grow very large, many juvenile specimens are known.
Several other genera have been described, mostly from juvenile specimens.
Juvenile specimens prey on very small flies and insects during the first months of their lives.
Only four plants were ever found, three juvenile specimens and one plant just reaching flowering stage.
