Heteromesus schmidtii Hansen 1916

• Main Authors: Cunha, Marina R., Wilson, George D. F.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Ischnomesidae; Heteromesus; Heteromesus schmidtii; Iceland; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5064430; http://treatment.plazi.org/id/EB65B41CFFA8E4316A4DFAD3D7EA93A0

Heteromesus schmidtii Hansen, 1916 (Fig. 26) Heteromesus schmidtii Hansen 1916: 69–70, pl. VI, fig. 3a–e; Gurjanova 1932: 45, tabl. XV, 56, 1933: 411; Menzies 1962: 122; Wolff 1962: 85, 217, 260; Kussakin 1988: 477–478, fig. 390. Material examined Holotype: female (4.1 mm), North Atlantic: South of Iceland, 62º 57’N, 19º58’W, 14 Jul 190, R / V Thor, 3956m (508 Danish fathoms) (ZMUC CRU­8027). Remarks on type material. The holotype is a fragile preparatory female, with most pereopods broken; the left uropod and right pereopod I are also broken but in the vial. Diagnosis ( Female characters only ) Pereonite 1 with paired lateral spines; pereonite 4 with median tubercle and paired tubercles. Pereonite 5 length 1.9 width. Antennula with 3 articles altogether, article 2 distal tip produced distally beyond insertion of next article, distal article inserting subapically, article 3 terminal. Description ( Female characters only ) Body length 4.5 mm; granular. Head length 0.40 width; dorsal surface with pair of cephalic bullae; dorsal cuticle tubercular granulation. Pereonite 1 width 0.20 total body length; with median tubercle, 1 pair of dorsal tubercles, 1 pair of anterolateral simple spines, 1 pair of lateral simple spines. Pereonite 2 with median tubercle, 3–4 pairs of dorsal tubercles, 1 pair of lateral tubercles. Pereonite 3 with median tubercle, 3–4 pairs of dorsal tubercles. Pereonite 4 length 0.60 width; with median tubercle, 2–3 pairs of dorsal tubercles. Pereonites 1–4 tubercles arranged in row along anterior margin, anterolateral spines stout, length distinctly less than length of pereonite 1. Pereonite 5 length 0.25 total body length. Pleotelson length 1.3 width. Antennula article 2 length 0.59 head width, with 3 elongate stiff ventromedial setae; article 3 terminal, squat, wider than long, aesthetascs absent. Antenna length 1.6 anterior body length; article 2 with 1 ventromedial spine; article 3 length 0.41 anterior body length, length 4 width, with 1 ventromedial short pedestal spine with thin curved ...