Australian Isopoda: Families

S.J. Keable, G.C.B. Poore & G.D.F. Wilson

Hyssuridae Wägele, 1981

Hyssuridae (genus-group A) Wägele, 1981: 68.

Hyssuridae. -Poore, 2001a: 129.

Description. Body. Body shape without loss or gross modification of appendages on one side of the body; in dorsal view without peduncular articles of antenna 1 or 2 contiguous with coxal margins.

Head. Head not capable of lateral rotation (laterally encompassed, abutting or fused to pereonite 1). Antenna 1 inserting on head anteriorly and/or dorsally to antenna 2, minute or well developed; not as follows: reduced to 2 articles with second article expanded and scalloped. Antenna 2 well developed; flagellum of fewer than 10 articles, shorter than peduncle. Mouthparts not forming suctorial cone or proboscis; not produced anteriorly. Mandible not projecting anteriorly and together forceps-like; compact, with weakly-toothed transverse incisor; palp present. Maxilliped palp broad (c. twice as long as wide), with 5 free articles or with all articles fused; endite reaching palp article 3 or absent or obsolete.

Pereon. Pereonites 6-7 pereonite 7 distinct dorsally, free. Pereonite 7 longer than wide, little or not shorter than pereonite 6. Pereopods 6-7 pairs readily apparent; 1-3 or 1-7 not prehensile. Pereopod 1 propodal palm without proximal tooth (palm more or less continuous with that of carpus). Pereopods 2-3 carpus strongly produced posterodistally; propodus with more than 1 robust setae in addition to posterodistal robust seta, or without posterodistal robust seta. Pereopods 4-7 propodus with more than 1 robust setae in addition to posterodistal robust seta, or with posterodistal robust seta only. Pereopods 5-7 without flattened setose articles andor dactyls modified or absent. Pereopod 7 propodus anterodistal serrate setae absent.

Pleon / Pleotelson. Pleonites 1-5 free and articulating; together 3 times as long as wide. Pleonites 4-5 without plumose setae on pleonal epimera or posterior borders. Pleopods 5 pairs present; 1-5 similar, none opercular. Pleopod 2 of males not consisting of an enlarged peduncle with a geniculate endopod and a small muscular exopod. Pleotelson statocysts absent. Uropods positioned proximally on pleotelson; distinct from pleopods, not forming operculum over pleopodal chamber (although may be folded ventrally below pleotelson). Peduncle not forming an elongate clavate article with rami reduced or absent. Endopod not claw-like (acute and recurved) andor posteroventral in position. Exopod folded dorsally over pleotelson.

Distribution and generic composition. See Kensley et al. (1996).

Cite this publication as: 'S.J. Keable, G.C.B. Poore & G.D.F. Wilson (2002 onwards). 'Australian Isopoda: Families. Version: 2 October 2002.'.