The species described below, Maoriphimedia hinemoa, is designated genotype.

Maoriphimedia hinemoa n.sp. (Figs. 36–68)

Colour in spirit white. Eyes small, ovate. Eyelobe has strong distal tooth, smaller tooth above on anterior margin. Antennae and peraeopods incomplete. Body segments 5, 6 and 7 each have posterodistal angle produced in acute tooth. Segment 7 and pleon segments 1–3 have paired dorsal tooth-flanges, epimeral plates each have mediolateral tooth as well as posterodistal tooth in 2nd and 3rd; sideplates of peraeopod 3–5 have posterodistal angle produced in acute tooth, especially in peraeopod 3; a median raised tooth also on the surface of peraeopod 4 sideplate, a less strongly raised tooth on peraeopod 3 sideplate. Rostrum well developed. Length 8 mm.

Antennae. First: Peduncle 1st segment stout, width about ⅔ length of superior margin, ½ total length, the superodistal angle produced in short acute tooth, the outer lateral margin in very strong tooth more than ½ along 2nd segment; 2nd produced in hooded spur ½ along 3rd, width ½ total length, total length not quite ½ that of 1st; 3rd ½ total length 2nd, width ⅔ length, angles not produced, a few bristle-setae on segments. Flagellum 1st segment twice length 2nd, noticeably longer than 3rd; flagellar segments with 1 or 2 spines, 2 flaccid sensory setae on inferodistal angles. Second: Peduncle 1st segment as wide as long, as long as 2nd excluding superodistal angle which is produced in strong spur ½ along 2nd; 2nd, width about ¾ length, 1 or 2 bristle-setae distally; 3rd not quite twice length 2nd, width ⅖ length, distal angles a little produced, very minute pectinations and a few bristle-setae on margins.

Mouthparts. Upper Lip: Subrectangular, wider than long, small distinct notch on distal margin. Lower Lip: Outer lobes bristled outside apical incision First Maxillae: Inner plate short, 8 plumose setae on inner distal margin; outer plate has 11 toothed spines distally, some of these saw-toothed on both margins, bristled about spine-bases. Palp 1st segment about ⅗ length 2nd, spine on inner distal angle; 2nd has 6 finely toothed spines on end margin, a few fine spine-setae. Mandibles: Inner margin strongly and smoothly convex medially above palp base; above this convexity a distinct transverse suture, then distally narrowing to blunt spoon-shaped apex, blunt medially crooked finger-like accessory plate in left arising from suture level and not quite reaching apex. Palp of 3 segments, 1st ½ length 2nd; 2nd linear, width ¼ length, has 2 or 3 setae on inner distal angle; 3rd has convex outer margin, inner straight, inner surface strongly bristled, 1 strong toothed spine, 2 or 3 equally long plumose setae on blunt end, smaller plumose setae and spine-setae down inner margin. Maxilliped: Inner plate reaching about ⅔ along outer; subrectangular, about 8 long plumose setae down cleft margin which is also bristled; 2 stout serrated spines outside sharp inner distal angle, about 8 plumose setae across rest of end margin and a little down outer distally. Outer plate broadly lanceolate, distal ⅔ of inner and outer margins straight and meeting in quite sharp point, strongly fringed with plumose setae. Merus width ⅓ length, strong setae on outer distal angle, 9 or 10 shorter setae along inner margin. Carpus distally as wide, ½ as long, straight outer margin has tuft of long setae on distal angle, inner slightly widened and convex distally, the convex ½ fringed with long setae; propod as long, ½ as wide, 2 setae on outer margin, distal ½ of inner which rounds to blunt apex strongly setose; dactylos absent.

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Gnathopods. First: Sideplate ovate-rectangular, width ⅓ length, setal notch posteriorly on rounded ventral margin. Basos slightly longer, arcuate, width about ⅛ length, numerous long fine plumose setae on proximal ⅓ of anterior margin, otherwise naked. Ischium as wide, ½ as long, naked like merus and carpus. Merus subtriangular, ⅓ basos length, as wide, reaching ⅖ down carpus which is 6/11ths basos length, arises from narrow stem early on merus. Propod as wide, as long as ischium, the posterodistal angle produced in sharp slender palm so gnathopod chelate, process and dactylos alike with 2 strong plumose setae on each, inner margin slightly toothed distally, differing only in very slender cap on dactylos, and 3 setae at process base. Second: Sideplate ovate-arcuate, width ⅓ length, 3 or 4 minute setae and serrations on distal portion of lower anterior margin, 2 setal notches on rounded apex. Basos as long, width about ⅕ length, setae on margins; ischium ½ as long, 2 or 3 bristle-setae on each margin; merus ovately triangular, as wide as ischium, posterior margin ¾ its length, anterior ⅓ length posterior, bristle-setae on anterodistal angle and posterior margin. Carpus and propod subequal, almost ischium length, bristle-setae anterodistally on carpus; propod has 3 long setae on anterior surface, 2 about outer margin of dactylos which has bristle-setae on surface near tip, inner tip has 4–5 small teeth, slender cap; propod posterior margin has about 8 sets of 1–3 or so split-tipped long setae on distal ½, the last groups on produced posterodistal angle of chelate gnathopod, the narrow blunt process has short stout spine at tip, slender spine-setae on inner margin.

Peraeopods. First: Sideplate like Gn. 2, but width ½ length, 1 setal notch. Basos width ⅓ length, length ⅔ sideplate, 2 or 3 spines on margins distally, setae on posterior margin proximally. Ischium ⅓ basos length, 2 spines on posterior margin, width ¾ length. Merus piriform, distal width ¾ length, 3 sets of 2–4 spines on each margin. Rest missing. Second: Sideplate anterior margin strongly convex, 4 or 5 minute setae and serrations distally, also on posterior margin; posterior produced in quite strong tooth about ⅓, shallowly excavate above, concave below. Third: Sideplate anterior lobe rounded, posterior basically subrectangular but produced posterodistally to long acute process. Basos subrectangular, slightly longer than wide, 5 or so stout spines on anterodistal angle which is produced a little down ischium: posteriorly expanded in squarish flange, posterior margin concave, has a few minute setae; ischium subsquare, about ⅓ basos length, about 5 spines on anterior margin, merus piriform, ½ basos length, distally as wide as long, straight anterior margin has 4 sets of 1–4 spines, is in parts minutely toothed; convex posterior has 4 sets of 1–3 spines, is also minutely pectinate, posterodistal angle produced strongly downwards. Other segments missing. Fourth: Peraeon segment acutely produced posterodistally; sideplate more or less subsquare, posterior margin somewhat sigmoid, posterodistal angle a sharp tooth, smaller raised tooth on posterodistal surface. Basos about as long as wide, straight anterior margin has 14 or so spines, long plumose setae distally; posterior margin has appearance of being convex with shallow concavity punched out of posterior margin, the posterodistal angle a little produced, minute setae along margins, long setae on surface mediodistally. Fifth. Sideplate subrectangular, wider than deep, posterodistal angle produced in sharp tooth. Basos twice as long as sideplate, barely wider than long; about 12 strong single spines on slightly convex anterior margin, posteriorly expanded in ovate flange, a sharp tooth posterodistally, margin has minute setae and serrations.