Bisiavir clam

The bisiavir clam is a virid mollusc filter-feeder with a soft shell, found particularly in shallow tropical coastal shelves in northern Anásthiasplugin-autotooltip__small plugin-autotooltip_bigAnásthias

Anásthias [a-NAS-thee-ass / ænæsθiːæs], or [an-ass-THEE-as] is an equatorial island continent, heart of the Civilised World. The north straddles the equator and is hot and humid, while most of the equatorial centre is an upland plateau with fertile river valleys, and stretches of arid plains and desert in the shadow of the mountains. The south is temperate but more wild, separated from the civilisations of the north by the almost impassable Harthera.

The clams are harvested for sea silk, a thin tough flexible fibre excreted by the creatures to secure themselves to rocks.