Holidoteidae Wägele, 1989

Stransky, Bente, Svavarsson, Jörundur, Poore, Gary C. B. & Kihara, Terue Cristina, 2020, Revision of Pleuroprion zur Strassen, 1903 (Holidoteidae) and re-evaluation of Spectrarcturus Schultz, 1981 (Arcturidae) (Crustacea, Isopoda, Valvifera), Zootaxa 4894 (1), pp. 1-52 : 3

Family Holidoteidae Wägele, 1989

Holidoteinae Wägele, 1989: 137.

Holidoteidae—Poore 2001: 223.— Poore 2003: 1807–1809.— Kensley, Schotte & Poore, 2007: 440.

Diagnosis (slightly modified from Poore 2003): Body straight, more or less flattened or semi-cylindrical. Head and pereonite 1 fused. Pereonite 4 of similar length to pereonite 3, not geniculate. All pleonites fused into pleotelson, or pleonite 1 articulating with fused pleotelson. Body smooth or slightly sculptured, or variously spinose or rugose; pleotelson without dorsolateral ridges ending in mediodorsal posterior spine. Dorsal coxal plates 2–7 obsolete, bases of pereopods exposed, or 2–7 obsolete and with expanded marginal tergites (females only). Mouthparts and pereopod 1 visible in lateral view (may be hidden by expanded tergites). Eyes well developed, or reduced or lost (rare). Antenna 2 flagellum of 2 or 3 articles plus distal claw. Pereopod 1 gnathopod, pereopods 2–4 elongated, differentiated from ambulatory pereopods 5–7. Pereopod 1 dactylus evenly curved along anterior margin, evenly tapering. Pereopods 2–4 with scattered and uneven long setae (sometimes pappose) along posterior margins; with short dactylus, unguis longer and setiform; pereopod 4 similar to pereopod 3. Pleonite 1 peduncle more elongate than on other pleopods; with marginal setae on rami longer than or equal to length of rami. Uropodal exopod shorter than wide, bearing single prominent robust seta, endopod with robust apical seta.

Pereopods of males without dense fur of fine setae. Penes fused as single penial plate; penial plate apically bifid and splayed. Pleopod 1 exopod thichened and with groove on posterior face, with overlapping rows of simple and plumose setae along lateral margin, terminating at subdistal excavation; with groove on posterior face of exopod ending on distolateral lobed tip, separated from most of lateral margin by notch. Pleopod 2 with appendix masculina about as long as endopod, basally less than half width of endopod.

Oostegites 1–4 functional, supported by coxal lobes; oostegite 5 absent.

Remarks: Holidoteidae contains three genera, Neoarcturus Barnard, 1914a , Austroarcturus Kensley, 1975 and the monotypic Holidotea Barnard, 1920 ( Poore 2003) . The arrangement of pereopods 2–4 and the form of the male pleopod 1 differentiate these genera. Pleuroprion is now added.