byssal retractor足丝牵缩机
byssal embayment足丝凹湾
byssal apparatus足丝器
byssal foramen足丝孔
byssal strand足丝条
byssal gland足丝腺
byssal sinus[古生] 足丝凹曲
byssal notch[古生] 足丝凹口
byssal groove足丝沟