Triacanthella are notable for the presence of three large spines at the apex of the abdomen. The spines consist of a pair placed dorsally, with the third (anal spine) positioned between and below them. The body cuticle is granular.
Early September 2016
Several found under a stone just above the intertidal zone. The middle collembolan in the last photo is not a Triacanthella species.
Mid September 2016
All photos of the same individual and found in the same spot as the above.