Heteromesus calcar Cunha & Wilson 2006, sp. nov

• Main Authors: Cunha, Marina R., Wilson, George D. F.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Ischnomesidae; Heteromesus; Heteromesus calcar; North Atlantic
• Online Access: https://zenodo.org/record/5064412; https://doi.org/10.5281/zenodo.5064412

Heteromesus calcar sp. nov (Figs 2–6) Etymology Calcar means spur, and is used as a noun in apposition. Material examined Holotype: female (3.7 mm), North Atlantic, Mid­Atlantic Ridge, Lucky Strike, 37º17.4'N, 32º16.6'W, 10 Aug 2000, R / V Prof Logachev, TTR10 stn AT­265­GR, 1685 m (ZMUC CRU­9878). Paratypes: male (3.2 mm), same data as holotype (ZMUC CRU­9879); 1 male (3.0 mm) same data as holotype, (dissected, mouthparts on slide AM P 72117); 3 females, 1 male, 1 intersex, 2 fragments (heads), same data as holotype (AM P 72118). Other material: 1 female, same locality as holotype, 37º17.5'N, 32º16.9'W, 11 Aug 2000, R / V Prof Logachev, TTR10 stn AT­271­GR, 1712 m (DBUA 786.01); 2 females, 1 manca, same locality as holotype, 37º17.4'N, 32º16.6'W, 11 Aug 2000, R / V Prof Logachev, TTR10 stn AT­273­GR, 1675 m (DBUA 786.02). Diagnosis Pereonites 1–3 with anterolateral spines. Pereonite 2 in female with no paired dorsal spines or tubercles. Pereonite 5 in female length 2.0 width, in male 6.3 width. Antennula with 3 articles altogether. Pereopods IV–V bases with pedestal spines; ischia with elongate pedestal spines. Description Body length in female 3.7 mm; granular. Head in female length 0.95 width; dorsal surface with pair of cephalic bullae; lobe on ventrolateral margin present in lateral view; dorsal cuticle tubercular granulation. Pereonite 1 in female width 0.2 total body length; with median tubercle, 1 pair of anterolateral simple spines, 1 pair of lateral simple spines. Pereonite 2 in female with median tubercle, 1 pair of anterolateral simple spines, 1 pair of lateral spines. Pereonite 3 in female with median tubercle, 1 pair of anterolateral simple spines. Female pereonites 1–3 anterolateral simple spines stout to long decreasing in length from pereonite 1 to 3, anterolateral spines length distinctly less than length of pereonite 1, lateral simple spines short. Pereonite 4 in female length 0.65 width. Pereonite 5 in female length 0.25 total body length. Pleotelson in female length 1.35 width; terminal ...