大砗磲 dà chē qú Tridacna gigas

大砗磲（学名：Tridacna gigas）：是砗磲科、砗磲的海洋动物。为双壳类中个体最大的贝类动物，被誉为双壳贝类之王。最大的大砗磲壳长可达1.8米，重约300千克，贝壳特大，壳质厚重，两壳相等，壳面有强大的放射肋，肋上常有鳞片或棘。外韧带，通常有一个大的足丝孔。铰合部有一个主齿和1-2个后侧齿。外套痕完整，前闭壳肌消失，后闭壳肌近中央。幼体时，其壳顶前方凹入的部分有强壮的足丝伸出，成体时足丝孔封闭。外韧带狭长，为棕褐色，几乎与贝壳后部等长。

百度翻译提供：

Tridacna gigas (scientific name: Tridacna gigas): it is a marine animal of the family Tridacna and Tridacna. It is the largest individual shellfish in bivalves and is known as the king of bivalves. The largest giant clam shell can be up to 1.8 meters long and weighs about 300 kilograms. The shell is very large, the shell is thick, the two shells are equal, the shell surface has strong radiating ribs, and the ribs often have scales or spines. The external ligament usually has a large foramen of the foot filament. The hinge part has one main tooth and 1-2 rear teeth. The coat mark is complete, the anterior adductor muscle disappears, and the posterior adductor muscle is near the center. In larva, the concave part in front of the shell top has strong foot filaments protruding, and in adult, the foot filament hole is closed. The external ligament is long and narrow, brown, almost as long as the back of the shell.