The researchers also found marine species, such as horseshoe crabs, corals and algae.

研究人员还发现了海洋物种，如马蹄蟹、珊瑚和藻类。

DNA samples also suggest the presence of horseshoe crabs and green algae in the area.

DNA样本还表明，该地区存在鲎和绿藻。

Scientists say horseshoe crabs have been living in ocean environments for more than 400 million years.

科学家说，马蹄蟹在海洋环境中生活了4亿多年。

The company manufactures LAL from horseshoe crab blood.

该公司用马蹄蟹血生产LAL。

In addition, the eggs of horseshoe crabs are an important food for an endangered bird called the red knot.

此外，马蹄蟹的卵是一种名为红腹滨鹬的濒危鸟类的重要食物。

Kraft said horseshoe crabs currently need stronger protection to survive.

卡夫说，马蹄蟹目前需要更强有力的保护才能生存。

New guidelines for dealing with horseshoe crabs were approved in May by the Atlantic States Marine Fisheries Commission.

今年5月，大西洋各州海洋渔业委员会批准了处理马蹄蟹的新指南。

Blue blood from horseshoe crabs is used by researchers to test for dangerous substances in vaccines, medicines and medical devices.

研究人员使用马蹄蟹的蓝血来测试疫苗、药品和医疗器械中的危险物质。

But the presence of horseshoe crabs in the shallow coastal waters suggests that the ocean and land alike were remarkably warm.

但在沿海浅水区发现的马蹄蟹表明，海洋和陆地都非常温暖。

These ancient beings are horseshoe crabs.

这些古老的生物是鲎。