Alacaris is an extinct genus of fuxianhuiid arthropod known from the Cambrian period.

It is only known from the type species Alacaris mirabilis (mistakenly named Alacaris multinoda in a figure in the describing paper) from the Cambrian Stage 3 aged Xiaoshiba Lagerstätte in Yunnan Province, China.

It is morphologically similar to Chengjiangocaris, with which it forms a clade within Fuxianhuiida.

Individuals reach a maximum of 12 centimetres in length, with a trunk consisting of 13 tergites.

[1] Shankouia Liangwangshania Alacaris Chengjiangocaris Fuxianhuia Guangweicaris