Acinocricus is a genus of extinct panarthropod belonging to the group Lobopodia and known from the middle Cambrian Spence Shale of Utah, United States.

[2] The first specimen of Acinocricus was discovered by American palaeontologist Lloyd Gunther in 1982 from the Spence Shale in Miners Hollow, Wellsville Mountains, Utah.

[1] Conway Morris and Robison made an erroneous classification by assigning it as an alga (in the phylum Chlorophyta) as they were convinced that it had no particular resemblance to any known animal fossils (medusoid) known at the time.

[3] In 1998, Jun-yuan Chen (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences) and Lars Ramsköld (Uppsala University, Sweden) made assessment of all available Cambrian lobopod fossils and came to the conclusion that Acinocricus belongs to Lobopodia.

It is regarded as characteristically most closely related to Collinsovermis, with the major differences being its larger size, fewer anterior legs, absence of sclerites and its numerous rows of back spines.