species单复数同形吗

　　例句：

　　This species is found in coastal waters around the Indian Ocean.

　　在环印度洋沿岸的海域有这一物种。

　　The male of the species has a white tail.

　　这一物种的雄性有一条白色的尾巴。

　　She conjectured the existence of a completely new species.

　　她推测有一个全新物种存在。

　　The society was set up to preserve endangered species from extinction.

　　成立这个协会是为了保护濒危物种不致灭绝。

　　Conservationists calculate that hundreds of species could be lost in this area.

　　自然资源保护主义者预测，数以百计的物种可能会从这个地区消失。