It is pale grey on the back with 4-5 irregular brown saddle-like blotches running from the nape to the caudal peduncle and the ventral side is white.

There is a scattering of orange spots with darke margins on the head and body and there is an oblique black band under each eye.

[3] Tomiyamichthys alleni is known to occur in the western Pacific Ocean where it has been recorded from Flores and Bali, in Indonesia, and also from waters off southern Japan.

[1] Tomiyamichthys alleni is found where there are fine sandy bottoms living in association with alpheid shrimp Alpheus randalli,[3] and it has been recorded in pairs.

[1] Tomiyamichthys alleni is known from just 8 specimens and a number of photographs and very little is known about its actual distribution and population, the IUCN therefore assesses its status as Data Deficient.