Hansen, 1910
Generic diagnosis:
The eye is round.
The 1st segment of the peduncle of 1st antenna has a low, pectinate, anteriorly-directed fringe or lappet (Pseudeuphausia lappet). The outermost digit of the pectinate fringe is the largest and is situated laterally on the peduncular segment, at the position where such a spine occurs individually, not as part of a lappet, on many other euphausiid species. The 2nd segment of the 1st antenna has 7-10 distal setae which are directed anteriorly, adhering closely to the 3rd segment, with the tips converging mid-dorsally as a bundle.
An acute rostrum is lacking but the frontal plate projects anteriorly, beyond the midpoint of the eye, as a rectangle, the anterior margin of which appears somewhat concave in dorsal view and is medially depressed (Pseudeuphausia-rostrum).
Thoracic legs 1-6 are similarly developed (Pseudeuphausia-thoracic legs). The three distal segments of the 6th thoracic leg (endopod) of the male are, together, scarcely more than half as long as those segments of the 5th leg. In the female the 6th leg is only half as long as the 5th, but the 3rd and 4th segments of the 6th leg form a semi-circle that curves forward to support an ovisac, while the 5th-8th (distal) segments are extremely short.
The 6th segment of the abdomen has a short mid-dorsal posterior denticle.
In the petasma, the inner lobe bears three or four small spine-shaped processes, and no other processes. The median lobe bears a long, leaf-shaped plate extending well beyond the limit of the lobe. An auxiliary lobe is lacking. The setiferous lobe is a long and slender digit, without setae.
Eggs are carried externally by the female, attached to thoracic limbs by a glutinous adhesive.
The genus was considered monospecific (P. latifrons) until Wang and Chen (1963) described Pseudeuphausia sinica from the Yellow Sea and the eastern part of the East China Sea southward to Hong Kong.