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Article History

Received: 29 March 2018

Revised: 25 July 2018

Accepted: 10 August 2018

First Online: 21 February 2020

COMPLIANCE WITH ETHICAL STANDARDS

: Conflict of interest . The author declares that she has no conflict of interest.

: Statement on the welfare of animals . All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

: Letter designations in are as follows: bt , byssal threads; br , byssal root; c , cuffs; bs , byssal stem; ad , attachment disks; f , mussel’s foot; pf , proximal part of foot; df , dorsal part of foot; g , ventral foot groove; sl , stem lamellae forming the core; z , zone of transition from distal to proximal part of the byssal thread; de , distal end of the byssal thread; pe , proximal end of the byssal thread; lc , longitudinal cord; ec , external cuticle; cfb , strong bundles of collagen fibers; efb , elastic collagen fibers; dp , disk plate; ac , anterior cord; pc , posterior cord; ltc , lateral cord; c , cavity; frs , furrows of a smaller order; os , opposite side of the byssal thread; ce , corrugated edge; lfr , longitudinal furrow; tfr , transverse furrow; tfd , transverse fold.