The genus is still better known as a Silurian form, but the spinose species appear to belong exclusively to the "Lower Devonian," and are found in Britain, Europe, and the Cape of Good Hope.
"The Student's Elements of Geology"
Sir Charles Lyell
About a week later the eggs hatch into small spinose caterpillars which begin feeding upon the leaves near by.
"Butterflies Worth Knowing"
Clarence M. Weed
The hairy and spinose kinds are invariably rejected, as were four conspicuously-coloured species.
"The Descent of Man and Selection in Relation to Sex, Vol. I (1st edition)"
Charles Darwin