Ianthopsis Beddard 1886
Creators: name: Riehl, Torben
name: Schienbein, Katharina Ellen
name: Mifsud, Constantine
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Acanthaspidiidae
Ianthopsis

description: Ianthopsis Beddard, 1886
Composition: Ianthopsis beddardi Kussakin & Vasina, 1982, Ianthopsis beddardi Kussakin & Vasina, 1982, Ianthopsis certus Kussakin & Vasina, 1982, Ianthopsis franklinae Brandt, 1994, Ianthopsis kimblae Brandt, 1994, Ianthopsis laevis Menzies, 1962, Ianthopsis monodi Nordenstam, 1933, Ianthopsis multispinosa Vanhöffen, 1914, Ianthopsis nasicornis Vanhöffen, 1914, Ianthopsis nodosa Vanhöffen, 1914, Ianthopsis ruseri Vanhöffen, 1914, Ianthopsis studeri Kussakin & Vasina, 1982, Ianthopsis vanhoeffeni Just, 2001.
Ianthopsis bovalii (Studer, 1884) Beddard 1886: Museum für Naturkunde, Berlin, 5499 Synonyms: Janthe bovallii Studer 1884: 10-12; plate 1, figs. 2 a – d.
Description
Synonymy
Ianthopsis Beddard, 1886: 15. – Nordenstam (1933: 180); Brandt (1994: 224); Just (2001: 918-919); Janthopsis Menzies (1962 b: 83) (unjustified emendation) (Nordenstam 1933, Menzies 1962, Brandt 1994, Just 2001).
Diagnosis
Cephalothorax pre-ocular spine present; frontal projection (rostrum) present, rostrum shape simple (bulge-shaped) to complex (spine-like rostrum); dorsal tubercles present or absent; eyestalks present or absent. If present, eyestalk shape variable, from long stalks to low bulges; exes present or absent. Pereonites dorsal (tergal) projections absent or present, variable in shape if present (hump-shaped to spine-shaped). Pereonite 1 lateral projections either single or bifid. Pereonite 2 lateral projections bifid. Pereonites 2-4, 6-7 posterolateral projections without rows of elongate, simple setae. Pereonite 7 without sternal spine. Pleotelson with short curved robust setae.
Antenna article 6 without distal triangular lobe. Mouthparts orientation ventral or moderately prognathous. Mandibular molar shape variable, cylindrical, triturating or (rarely) tapering, without apical long setae; palp present. axilliped epipodite long, reaching to or beyond palp articulation.
Pleopod 2 stylet straight. Uropod length variable, from shorter than pleotelson to longer than pleotelson; uropodal rami shorter than or peduncle length.
Notes
Character states that were once considered diagnostic for Ianthopsis became irrelevant over time with more species being described, which is expressed in the fact that " either-or " statements survived as quasi testimonies of this development in the genus diagnosis: “ cephalothorax dorsal tubercules present or absent ”, “ eyestalks present or absent ”, “ eyes present or absent ”, “ pereonite 1 lateral projection single or bifid ”, “ dorsal spines or humps on pereonites present or absent ” (Table 1). This made it necessary to examine both genera in detail and to critically revise their diagnoses, which we have accomplished here.
Besides strictly diagnostic (unique) character states, the revised diagnosis includes also variable characters which are diagnostic in the genus Mexicope or the new species Mexicope maletensis, sp. nov.
description: Published as part of Riehl, Torben, Schienbein, Katharina Ellen & Mifsud, Constantine, 2024, A new species of Mexicope Hooker, 1985 (Crustacea, Isopoda) — the first record of Acanthaspidiidae Menzies, 1962 from the Mediterranean Sea, pp. e 121508 in Biodiversity Data Journal 12 on page e121508, DOI: 10.3897/BDJ.12.e121508