Sea silk is a fine fabric woven from the byssus threads of bivalves, particularly the pen shell ( " Pinna nobilis " ).
22.
The byssus threads from this " Pinna " species can be up to 6 cm in length and have historically been made into cloth.
23.
They then migrate to hard surfaces ( usually old oyster shells ) where they attach by secreting a " glue " like substance from their byssus gland.
24.
When young they are attached to the substrate by a byssus but mature animals are capable of swimming by the opening and rapid closing of the valves.
25.
The sakos covered the head entirely like a sack or bag; it was made of various materials, such as silk, byssus, and wool.
26.
During metamorphosis, the veliger sheds its velum and, depending on species, may secrete an attachment structure called a byssus that anchors it to the substratum.
27.
They are not closely related to true oysters ( family Ostreidae ), however they do cement themselves to rocks, rather than attach themselves by a byssus.
28.
In marine mussels, the foot is smaller, tongue-like in shape, with a groove on the ventral surface which is continuous with the byssus pit.
29.
Larvae stay in the water column for the next four to seven weeks before dissipating to the ocean floor, where they attach themselves to objects through byssus threads.
30.
The shells of bivalves in this family are fragile and have a long and triangular shape, and in life the pointed end is anchored in sediment using a byssus.
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