Heteromesus dentatus , Hansen 1916

• 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 dentatus; Menzies; Iceland; North Atlantic
• Online Access: https://zenodo.org/record/5064416; https://doi.org/10.5281/zenodo.5064416

Heteromesus dentatus Hansen, 1916 (Figs 13–14) Heteromesus dentatus Hansen 1916: 66–68, pl. V, figs. 6a–d, pl. VI, figs. 1a–c; Gurjanova 1932: 45, tabl. XV­54, 1933: 411; Menzies 1962: 122; Wolff 1962: 85, 217, 259; Kussakin 1988: 474–475, fig. 387. Material examined Syntypes: 2 males (posterior fragments, fragment illustrated 3.0 mm), 1 female (anterior fragment illustrated 1.7 mm), 2 heads and 1 pleotelson of undetermined sex, North Atlantic: southwest of Iceland, 60º37'N, 27º52'W, 1895–1896, R / V Ingolf stn 78, 1505 m (799 Danish fathoms) (ZMUC CRU­6258). Remarks on type material. Specimens in ZMUC CRU­ 6258, are considered to be syntypes. We do not designate a lectotype here because all specimens are fragmentary. The mutilated and fragile specimens illustrated by Hansen were identified and re­illustrated (preparatory female: anterior fragment with head and pereonites 1–4, both pereopods I are missing; male: posterior fragment from pereonite 2 to pleotelson, right uropod missing). Male pleopods I and II were illustrated from a third specimen (male: posterior fragment P5­pleotelson). Diagnosis Pereonite 1 in female with 1–3 pairs of dorsal rook spines; pereonite 5 in male with posterodorsal rook spines; pereonite 6 in male with dorsal rook spines; pereonite 7 in male with lateral rook spines. Pereonite 5 in male length 5.5 width. Pleotelson (only male known) with posterolateral rook spines. Antennula with 5 articles altogether. Description Body granular. Head in female length 0.75 width; dorsal surface with pair of cephalic bullae; lobe on ventrolateral margin present in lateral view; dorsal cuticle fine spinous granulation. Pereonite 1 in female with median rook spine, 1–3 pairs of dorsal rook spines, 1 pair of anterolateral simple spines, 1 pair of lateral simple spines. Pereonite 2 in female with median rook spine and median tubercle, 2–3 pairs of dorsal rook spines, 1–2 pairs of dorsal tubercles, 1 pair of anterolateral rook spines, 1 pair of lateral rook spines. Pereonite 3 in female with median rook ...