Haplomesus corniculatus Brokeland & Brandt 2004

• Main Authors: Kavanagh, Fiona A., Wilson, George D. F., Power, Anne Marie
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Ischnomesidae; Haplomesus; Haplomesus corniculatus; Drake Passage; Elephant Island; Scotia Sea
• Online Access: https://doi.org/10.5281/zenodo.6256244; http://treatment.plazi.org/id/03BFFB72FFA2905C713B9137FB28693E

Haplomesus corniculatus Brökeland & Brandt, 2004 Haplomesus corniculatus Brökeland & Brandt, 2004: 1777 –1784, figs 6–10. Holotype (ZMH­K40638) (not examined). Type locality . 59º40.30'–40º.32'S, 57º35.42'–35.64'W, 3689 m, off Elephant Island, Drake Passage, Scotia Sea. Material examined . None, description based on Brökeland & Brandt (2004) for the males. Diagnosis . Male with anterolateral spines on pereonite 1 only. Pereonite 7 length not reduced, similar to pereonite 6; pleotelson posterolateral margin anterior to uropods with pedestal spines, longer than uropods. Antennula with 4 distal flagellar articles. Pereopod I carpus ventral margin with 1 distal robust seta on palm. Pereopods II–VI bases with simple spines on dorsal and ventral margin. Pleopod I of male with simple setae on lateral and distal margins; pleopod II stylet extending beyond distal margin of protopod. Description of male (female unknown) . Body length 4.2 mm. Head length 0.6 width. Head cuticular structure granulated. Head lobe on ventrolateral margin absent in lateral view. Pereonite 1 width 0.14 total body length. Pereonite 1 anterolateral simple spines, elongate, length near width of pereonite 1. Male pereonite 1 anterolateral spines robust and anteriorly curved. Pereonite 5 length 3.9 width, 0.5 total body length. Pleotelson length 1.1 width; posterolateral margin anterior to uropods with pedestal spines. Pleotelson dorsal surface axial ridge weakly vaulted, separated from lateral fields only by shallow elongate concavities; posterolateral margin adjacent to uropods convex. Antennula and antenna . Antennula with 6 articles altogether; article 2 length 0.6 head width, with 2 elongate ventromedial setae; distal articles altogether small, shorter than article 2; article 3 length similar to article 4; article 3 elongate and tubular, much longer than wide; terminal article shorter than penultimate article. Antenna length 2.5 anterior body length; article 3 cuticle smooth, length 7.5 width; article 5 length 0.6 anterior body ...