Males have a rose thorn spicule and no bursa. Therefore, there are two mineral phases in larval spicule formation. Amoeboid sperm crawl along the spicule into the female worm. The spicule and spicular sheath are absent or vestigial in the male. A minute spicule of bone frequently connects the promontory to the pyramidal eminence. Spicule formation is also important for "Suberites". However, many species were eventually discovered to have similar spicule sheath lengths. A sponge spicule fragment is known from the formation. The spicule length is 4.18-5.62mm for both genders. On occasion, sclerocytes may begin a second spicule while the first is still in progress.