Their growth is very slow , and to reach the 5 cm length , they require 15 to 35 years .
They bore into marine rocks , producing a boring called Gastrochaenolites .
Gastrochaenolites ' growth is very slow , and to reach the 5 cm length , they require 15 to 35 years .
They bore into marine rocks , producing a boring called Gastrochaenolites .