Heteromesus ctenobasius 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 ctenobasius; North Atlantic
• Online Access: https://zenodo.org/record/5064414; https://doi.org/10.5281/zenodo.5064414

Heteromesus ctenobasius sp. nov. (Figs 7–12) Etymology The name pertains to the comb­like basis of the pereopods. Material examined Holotype: female (4.3 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 CRU­9874). Paratypes: male (4.3 mm), same data as holotype (ZMUC CRU­9875); 2 females, 1 fragment, same data as holotype (AM P 72119). Other material: female, same locality as holotype, 37º17.3'N, 32º16.5'W, 8 Aug 2000, R / V Prof Logachev, TTR10 stn AT­250­GR, 1704 m (SEM stub AW575, AM P 72120); 1 female, same locality, 37º17.5'N, 32º16.9'W, 10 Aug 2000, R / V Prof Logachev, TTR10 stn AT­262­GR, 1720 m (DBUA 787). Remarks on type material. Male pereonites 2 and 3 damaged. Diagnosis Pereonite 1–3 median pedestal spines. Pereonites 4–5 in female with lateral pedestal spines. Pereonite 5 in female length 2.3 width, in male 4.1 width. Pleotelson terminal margin with pedestal spines. Antennula with 5 articles altogether. Pereopod II–VII bases and ischia with pedestal spines. Description Body length in female 4.3 mm; granular. Head in female length 0.75 width; lobe on ventrolateral margin present in lateral view; dorsal cuticle fine tubercular granulation. Pereonite 1 in female width 0.2 total body length; with median pedestal spine, 1 pair of dorsal pedestal spines, 1 pair of anterolateral pedestal spines, 1 pair of lateral pedestal spines. Pereonite 2 in female with median pedestal spine, 1 pair of dorsal pedestal spines, 1–2 pair of dorsal rook spines, 1 pair of anterolateral pedestal spines, 1 pair of lateral pedestal spines. Pereonite 3 in female with median pedestal spine, 3–4 pairs of dorsal rook spines, 1 pair of anterolateral rook spines, 1 pair of lateral rook spines. Pereonite 4 in female length 0.65 width; with 3–4 pair of dorsal rook spines, posterolateral margins with row of 4 long pedestal spines topped by stout robust setae. Pereonites 1–4 in female with pedestal spines stout to long topped by short robust ...