The caudal fin can be truncate or emarginated and it has 121–134 scales along the lateral line.

[3] The Panama hake is an eastern Pacific species which is found from southern California and the Gulf of California south to Colombia, although its reported presence in many areas within this range needs verification.

[1] The Panama Hake is a demersal, bathypelagic species which occurs from the shallow continental shelf at 80m to the upper continental slope as deep as 500m, as well as in the ocean's midwaters and over sea mounts such as Uncle Sam Bank.

they reach sexual maturity when they attain a length of 18 to 19 cm.

[4] M. angustimanus has little importance commercially because of its small size and low abundance,[3] although it fetches high prices when it occasionally shows up on the market, as it is sometimes exported on a local level.