Waematau ringanohinohi, Ball & Webber & Shepherd, 2017

Ball, P., Webber, W. Richard & Shepherd, Lara D., 2017, New species and phylogeny of landhoppers in the genus Waematau Duncan, 1994 (Crustacea: Amphipoda: Talitridae) from northern New Zealand, Zootaxa 4306 (2), pp. 151-207 : 185-192

Waematau ringanohinohi sp. nov.

( FigS 24–28 )

Type material. Holotype: male (MNZ CR.023848), body length 11.0 mm, Radar BuSh, Northland, New Zealand, conifer-broadleaf foreSt, pit trap, coll. Ball O.J. -P., 14 Aug 2006 . Allotype: female (MNZ CR.023849), body length 10.0 mm, Radar BuSh, Northland, New Zealand, conifer-broadleaf foreSt, pit trap, coll. Ball O.J. -P., 14 May 2007 .

ParatypeS: 1 male (MNZ CR.023850), Kohuroa (A); 1 female (MNZ CR.023851), Kohuroa (A); 1 juvenile (MNZ CR.023852), Kohuroa (A); 1 male (MNZ CR.023853), Radar BuSh.

Diagnosis. Medium-Sized (body length 9–11 mm), weakly Sexually dimorphic. Eye medium, approximately one quarter to one third head length. Antenna 2 Shorter than head and firSt 3 pereoniteS. Maxilliped outer plate not arcuate or diStally acute. Gnathopod 1 propoduS SubSimple in both SexeS; gnathopod propoduS 2 mitten-Shaped in both SexeS. Gill on pereopod 6 extending aS a long, Slender proceSS poSteroventrally with no Subapical lobe. PleopodS 1 and 2 well developed, biramouS; pleopod 3 reduced but Still biramouS. Uropod 1 diStolateral robuSt Seta up to 0.3 timeS length of outer ramuS; outer ramuS with no dorSal robuSt Setae, inner ramuS with dorSal robuSt Setae. Uropod 2 rami with dorSal robuSt Setae. Uropod 3 peduncle with Single long robuSt Seta; ramuS 0.4–0.5 timeS length of peduncle, with 2 apical robuSt Setae. TelSon very upturned, marginS and apex with robuSt Setae.

Description. AdultS ( Fig. 24 ) 9–11 mm long. Head Slightly longer than pereonite 1. Eye medium, approximately one quarter to one third head length.

Antenna 1 ( Fig. 24 ) extending to half way along peduncle article 5 of antenna 2; article 3 of peduncle Subequal to or Slightly longer than article 2; flagellum conSiSting of 3–4 articleS, penultimate article geniculate and broadening diStally. Antenna 2 ( Fig. 24 ) Shorter than head and firSt 3 pereoniteS; article 5 of peduncle Slightly longer than or Subequal to article 4; flagellum Subequal in length to peduncle, conSiSting of 12–15 Short articleS.

Upper lip apical margin rounded and SetoSe. Mandible left lacinia mobiliS 4-dentate. Lower lip inner lobeS well developed, SetoSe. Maxilla 1 inner plate Slender with 2 apical plumoSe Setae; outer plate Slightly longer with 9 apical Serrate robuSt Setae, outer margin with veStigial palp. Maxilla 2 inner plate Shorter than outer, apical margin with many curved robuSt Setae, plumoSe Seta on inner margin; outer plate apex with many curved robuSt Setae. Maxilliped ( Fig. 24 ) outer plate broad, not arcuate or diStally acute; palp article 2 with Seta-covered diStomedial lobe, article 4 reduced and button-like.

Gnathopod 1 ( FigS 25 , 26 ) Similar in both SexeS. Coxa deeper than wide, ventral margin convex with few robuSt Setae; baSiS narrowing proximally along poSterior margin (Slightly leSS So in femaleS); iSchium Short; meruS poSterior margin convex, not produced into a lobe; carpuS narrow, hardly expanded poSterodiStally; propoduS narrow, Subrectangular, approximately 0.6 timeS length of carpuS, no diStinct lobe diStally, palm very Short and indiStinct; SubSimple.

Gnathopod 2 ( FigS 25 , 26 ) Similar in both SexeS. Coxa aS wide aS deep, ventral margin convex, with Small robuSt Setae, poSterior margin with Subacute proceSS; baSiS narrowing proximally; iSchium narrow; meruS ShorteSt, produced poSterodiStally into diStinct lobe covered in palmate Setae; carpuS with lobe covered in palmate Setae poSterodiStally; propoduS mitten-Shaped, approximately 0.8 timeS length of carpuS, lobe apically rounded and broad; dactyluS Short.

Pereopod 3 ( Fig. 26 ) coxa wider than deep, anterodiStal corner rounded, ventral margin weakly convex with few robuSt Setae, poSterodiStal corner curving to form Subacute proceSS; baSiS narrowing proximally; iSchium Short; meruS narrowing proximally; carpuS 0.5–0.6 timeS length of the meruS; propoduS 1.3–1.4 timeS longer than carpuS.

Pereopod 4 ( Fig. 26 ) coxa wider than deep, ventral margin nearly Straight, with few robuSt Setae, poSterodiStal corner curving to form Subacute proceSS; baSiS narrowing proximally; iSchium Short; meruS broadening diStally; carpuS 0.5–0.6 timeS length of meruS; propoduS approximately 1.6 timeS longer than carpuS, Subequal to or Slightly Shorter than meruS; dactyluS poSterior margin weakly pinched.

Pereopod 5 ( Fig. 27 ) coxa ventrally bilobate; baSiS Subovate; iSchium Short; meruS Strongly broadening diStally; carpuS Subequal to or Slightly Shorter than meruS, weakly broadening diStally; propoduS 1.3–1.4 timeS longer than carpuS.

Pereopod 6 ( Fig. 27 ) coxa ventral margin convex with few tiny robuSt Setae; baSiS Subovate; iSchium Short; meruS broadening diStally; carpuS Subequal to or Slightly Shorter than meruS, weakly broadening diStally; propoduS 1.3–1.4 timeS longer than carpuS.

Pereopod 7 ( Fig. 27 ) 1.1–1.2 timeS longer than pereopod 6; coxa wider than deep, ventral margin convex, with minute SerrationS each with a tiny robuSt Seta; baSiS broadly Subovate, Slightly longer than wide; iSchium Short; meruS narrowing proximally; carpuS Subequal to meruS, weakly broadening diStally; propoduS 1.4–1.5 timeS longer than carpuS.

Oostegites preSent on gnathopod 2 and pereopodS 3–5, weakly SetoSe diStally (from 4–11 Setae). OoStegite on gnathopod 2 moderately elongate, anterior margin with concave excavation medially, poSterior margin nearly Straight. OoStegiteS on pereopodS 3 and 4 elongate, Slightly longer than pereopod 2 ooStegite, anterior marginS concave, weakly expanded diStally. OoStegite on pereopod 5 SmalleSt, narrowing diStally.

Gills ( Fig. 28 ) preSent on gnathopod 2 and pereopodS 3–6. Gill on gnathopod 2 trilobate. GillS on pereopodS 3– 4 Simple, elongate, with diStinct twiSt medially or proximally. Gill on pereopod 5 twiSted proximally, diStinct lobe with rounded tip preSent diStally. Gill on pereopod 6 large, convoluted and expanded proximally with a Small lobe near baSe, long and Slender proceSS with Subacute tip extendS poSteroventrally.

Pleopods 1–2 ( Fig. 28 ) well developed, biramouS, pleopod 2 Slightly Shorter than pleopod 1; peduncle without long marginal Setae but with Short fine marginal Setae diStally; inner ramuS Slightly longer than outer and Subequal in length to reSpective peduncleS. Pleopod 3 ( Fig. 28 ) comparatively reduced, biramouS; peduncle approximately 0.6 timeS length of pleopod 2 peduncle, without long marginal Setae though fine Setae preSent marginally; rami diStinct but very Short, 0.3–0.4 timeS length of peduncle.

Epimeron 1 ( Fig. 24 ) Shallower than epimera 2–3. Epimeron 2 ( Fig. 24 ) deepeSt, poSteroventral corner with Small Subacute proceSS. Epimeron 3 ( Fig. 24 ) nearly aS deep aS 2, poSteroventral corner with Small Subacute proceSS.

Uropods 1–3 not Sexually dimorphic. Uropod 1 ( Fig. 28 ) peduncle lateral margin with 1 large dorSal robuSt Seta diStomedially (occaSionally a Second dorSal robuSt Seta proximally), and a large Subapical robuSt Seta, meSial margin with a large Subapical robuSt Seta and occaSionally a Small dorSal robuSt Seta diStally, diStolateral robuSt Seta 0.2–0.3 timeS length of outer ramuS; rami 0.7–0.8 timeS length of peduncle with long and Short Subapical and apical Stout robuSt Setae, outer ramuS without dorSal robuSt Setae, inner ramuS with 2–3 dorSal robuSt Setae.

Uropod 2 ( Fig. 28 ) peduncle approximately 0.5 timeS length of uropod 1 peduncle, weakly narrowing diStally, lateral margin with 1 dorSal robuSt Seta medially and 1 Subapical robuSt Seta, meSial margin with 1 Subapical robuSt Seta or none; rami Subequal in length to peduncle with long and Short Subapical and apical Stout robuSt Setae, outer ramuS with 2 (occaSionally 3) dorSal robuSt Setae, inner ramuS with 1 (occaSionally 2) dorSal robuSt Seta.

Uropod 3 ( Fig. 28 ) peduncle with 1 long lateral robuSt Seta; ramuS Short, 0.4–0.5 timeS length of peduncle, with 1 medium and 1 Small robuSt Seta apically.

Telson ( Fig. 28 ) Slightly longer than wide, apically very weakly inciSed, dorSal Surface convex proximally, upturned diStally, 2–4 robuSt Setae apically and Subapically, 1–3 marginal or Submarginal robuSt Setae dorSally and dorSolaterally on each Side, proximal Seta long and Situated near wideSt part of telSon.

Etymology. The Specific name ‘ ringanohinohi ’ iS a combination of the Te Reo Maori wordS ‘ringa’ meaning ‘hand’, and ‘nohinohi’ meaning ‘Small’, in reference to the Small and SubSimple nature of the gnathopod 1 propoduS.

Habitat. Native foreSt.

Distribution. North ISland, Northland: Radar BuSh, Kohuroa.

Remarks. Waematau ringanohinohi haS morphological affiliationS with W. kohuroa , W. reinga and W. rereke . TheSe four SpecieS are weakly Sexually dimorphic and the penultimate article of antenna 1 iS geniculate. Furthermore gillS 2–5 are Similar. Key morphological differenceS between W. ringanohinohi , W. kohuroa , W. reinga and W. rereke are outlined in Table 3.

Figures

FIGURE 24. Waematau ringanohinohi sp. nov., holotype male MNZ CR. 023848 (Whole animal, antennae), Radar Bush, Northland; paratype male MNZ CR. 023850 (maxilliped), Kohuroa (A), Northland.

FIGURE 25. Waematau ringanohinohi sp. nov., paratype female MNZ CR. 023851 (gnathopods 1 – 2), Kohuroa (A), Northland.

FIGURE 26. Waematau ringanohinohi sp. nov., paratype male MNZ CR. 023850 (gnathopods 1 – 2; pereopods 3 – 4), Kohuroa (A), Northland.

FIGURE 27. Waematau ringanohinohi sp. nov., paratype male MNZ CR. 023850 (pereopods 5 – 7), Kohuroa (A), Northland.

FIGURE 28. Waematau ringanohinohi sp. nov., paratype male MNZ CR. 023850 (gills 2 – 6, pleopods 1 – 3, uropods 1 – 3, telson), Kohuroa (A), Northland.