Pseudomma

Vicente, Carlos San, 2011, New Mysida (Crustacea) in the genus Pseudomma from the Bellingshausen Sea (Southern Ocean), Zootaxa 2833, pp. 15-28 : 27

Key to species of Pseudomma from the Southern Ocean

Adapted from Murano (1966, 1974) and Meland (2004).

1 Ocular plate with serrated margin......................................................................... 2

- Ocular plate without serrated margin..................................................................... 8

2 Lateral margins of telson with setae....................................................................... 3

- Lateral margins of telson without setae.............................................. P. antarcticum Zimmer, 1914

3 Lateral margins of telson sparsely armed with setae......................................................... 4

- Lateral margins of telson armed with many setae arranged in series of large setae with smaller ones in the spaces between them............................................................................ P. longicaudum Tattersall, 1955

4 Apex of antennal scale equal to or shorter than outer spine.................................................... 5

- Apex of antennal scale much longer than outer spine............................................ P. s a r s i Sars, 1883

5 Ocular plate with conspicuous serration................................................................... 6

- Ocular plate with fine serration................................................ P. schollaertensis Tattersall, 1955

6 Lateral margins of telson with setae only in distal end........................................................ 7

- Lateral margins of telson with setae on distal two thirds............................. P. magallanensi s Tattersall, 1955

7 Distal margin of telson armed with five pairs of smooth setae...................................... P. melandi n. sp.

- Distal margin of telson armed with eight pairs of serrate setae.............................. P. bellingshausensis n. sp.

8 Apex of antennal scale extending slightly if at all beyond terminal spine.......................................... 9

- Apex of antennal scale considerably extended beyond terminal spine............................................ 10

9 Telson short, less than 1.5 times of width, two pairs of setae on apex......................... P. armatum Hansen, 1913

- Telson long, equal or slightly longer than 1.5 times width, three pairs of setae on apex.. P. belgicae Holt and Tattersall, 1906

10 Telson triangular, very short, length equal to its breadth at the base......................... P. minutum Tattersall, 1955

- Telson linguiform, twice as broad at the base as at the apex................................. P. calmani Tattersall, 1955