[1] Its specific name, allmani, honours the Irish natural historian George J.

The short rostrum is about half as long as the eyes and is small with a rounded end.

On the endopodite of the second swimmeret of the male is a clamp-like feature called the appendix masculina.

[3] Crangon allmani is restricted to the east boreal zone of the Atlantic Ocean.

[7] It is found at a depth between 20 and 250 m, and occasionally as deep as 360 m. It inhabits sandy or muddy sea bottoms.

Newly laid eggs are translucent gold-coloured, round, and 0.39 mm in diameter.