Pseudomma antarcticum Zimmer 1914

• Main Authors: Meland, Kenneth, Brattegard, Torleiv
• Format: Other/Unknown Material
• Language: unknown
• Published: 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Mysida; Mysidae; Pseudomma; Pseudomma antarcticum; Antarctic; Weddell; Weddell Sea; Antarc*
• Online Access: https://zenodo.org/record/5667047; https://doi.org/10.5281/zenodo.5667047

Pseudomma antarcticum Zimmer, 1914 Pseudomma antarcticum Zimmer 1914: 389. Pseudomma antarcticum Tattersall 1955: 94. Pseudomma antarcticum Ledoyer 1990: 41. Material examined “Discovery”, st. 182 (Tattersall, 1955), 1 adult female (21.5 mm), 1 immature male (20 mm) NHML- 1958.11.19.515- 19. BIOICE 2844, 1 immature female (8 mm), 1 immature female (thorax), IMNH- 2196. Stn BIOICE 2853, 1 immature female (12 mm), IMNH- 2197. Stn BIOICE 2856, 1 adult female (14 mm), 1 immature female (13 mm), IMNH- 2198. Stn BIOICE 2859, 1 male (abdomen), 1 immature female (10 mm), IMNH- 2199. Description Pseudomma antarcticum was first decribed by Zimmer (1914) for the reception of an immature female from the East Antarctic and additional records were later reported from the South Shetlands (Tattersall 1955) and the Weddell Sea (Ledoyer 1990). Since previous descriptions have concentrated on presenting diagnostic characters within the Pseudomma we give a full description of both male and female P. antarcticum. Carapace (Fig. 7 A) with anterior margin evenly rounded and anteriorly produced lateral corners. Ocular plate (Fig. 7 A) extending to mid-portion of first segment of antennular peduncle; plate deeply cleft, anterior median portion of plate evenly rounded, antero-lateral margins finely serrated with 20–25 stout setae. Antennal scale (Fig. 7 B) 3.0 times longer than broad; distal terminal denticle on outer margin consisting of one spine; apex extends slightly beyond terminal denticle, without suture, outer margin of apex armed with five setae. Left mandible setal row consisting of three hirsute spines and right mandible setal row consisting of nine entire spines. Distal segment of mandible palp (Fig. 7 C) with five enlarged proximal ventral setae, medial margin with row of eight to ten setae, dorsal margin with eight setae. Maxillule (Fig. 7 D), apex of coxal lobe armed with three strong setae bordered by three smaller setae placed distal-posterior, distal-ventral, and distal-anterior; anterior lateral margin armed with two ...