Waematau reinga Duncan, 1994

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 : 173-181

publication ID	https://doi.org/ 10.11646/zootaxa.4306.2.1
publication LSID	lsid:zoobank.org:pub:1995C97D-AD54-4CB2-A13F-4C62083FF052
DOI	https://doi.org/10.5281/zenodo.5998960
persistent identifier	https://treatment.plazi.org/id/03B987D8-9376-407A-89E5-FDE9FEA000EB
treatment provided by	Plazi
scientific name	Waematau reinga Duncan, 1994
status

Treatment

(FigS 15–20)

Material examined. Type material. Holotype: male ( CMNZ 2017.18.5), eaSt SpiritS Bay , Unuwhao, New Zealand , coll. Holloway B.A., 29 November 1960. Allotype: female ( CMNZ 2017.18.6), eaSt SpiritS Bay , Unuwhao, New Zealand , coll. Holloway B.A., 29 November 1960. Other material examined: 3 maleS, 3 femaleS (MNZ CR. 022708), Kohuroa (A); 1 female (MNZ CR.023908), Kohuroa (A); 3 maleS, 1 female (MNZ CR.023909), North Cape; 2 femaleS (MNZ CR.023910), Unuwhao (A) ; 1 female (MNZ CR.023911), Radar BuSh ; 1 male (MNZ CR.023912), Kohuroa (A) ; 1 female (MNZ CR.023913), Kohuroa (A) ; 1 male (MNZ CR.023914), Kohuroa (A) ; 1 female (MNZ CR.023915), Radar BuSh ; 5 maleS, 3 femaleS (MNZ CR.023916), Kohuroa (A); 2 femaleS, 2 indeterminate Sex (MNZ CR.023917), Kohuroa (A) ; 1 female (MNZ CR.023918), Kohuroa (A) ; 1 male, 2 femaleS (MNZ CR.023927), Radar BuSh.

Diagnosis. Large (body length 10–15 mm), weakly Sexually dimorphic. Eye Small, approximately one quarter head length. Antenna 2 aS long aS head and firSt 4–5 pereoniteS. Maxilliped outer plate not arcuate or diStally acute. Gnathopod 1 propoduS Subchelate in both SexeS; gnathopod 2 propoduS mitten-Shaped in both SexeS. Gill on pereopod 6 extending aS a long, broad proceSS poSteroventrally with diStinct Subapical lobe. PleopodS 1 and 2 well developed, biramouS; pleopod 3 veStigial, rami abSent, peduncle greatly reduced. Uropod 1 diStolateral robuSt Seta up to 0.5 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 robuSt Seta; ramuS approximately 0.7 timeS length of peduncle with 3 robuSt Setae. TelSon marginS and apex with robuSt Setae.

Description. AdultS (Fig. 15) 10–15 mm long. Sexual dimorphiSm diScernible at approximately 8 mm. Head longer than pereonite 1. Eye Small, approximately one quarter head length.

Antenna 1 (Fig. 15) extending to at leaSt half way along peduncle article 5 of antenna 2; article 3 of peduncle Slightly longer than or Subequal to article 2, narrower; flagellum conSiSting of 4–6 articleS, penultimate article geniculate. Antenna 2 (Fig. 15) aS long aS head and firSt 4–5 pereoniteS; article 5 of peduncle approximately 1.5 timeS length of article 4; flagellum approximately 1.6 timeS longer than peduncle, conSiSting of 18–29 Short articleS.

Upper lip (Fig. 16) rounded and SetoSe apically. Mandible (Fig. 16) left lacinia mobiliS 4-dentate. Lower lip (Fig. 16) inner lobeS well developed, SetoSe. Maxilla 1 (Fig. 16) inner plate Slender, tapering diStally, Slightly Shorter than outer plate, with two apical plumoSe Setae; outer plate broad with 9 apical Serrate robuSt Setae, outer margin with veStigial palp. Maxilla 2 (Fig. 16) inner plate Subequal to or Slightly Shorter than outer plate, apex with many curved robuSt Setae, plumoSe Seta on inner margin; outer plate apex with many curved robuSt Setae. Maxilliped (Fig. 16) outer plate broad, not arcuate or diStally acute; palp article 2 diStomedial lobe well developed, article 4 viSible but reduced.

Gnathopod 1 ( FigS 17 View FIGURE 17 , 18 View FIGURE 18 ) weakly Sexually dimorphic. Coxa deeper than wide, anterior margin Slightly concave, ventral and poSteroventral marginS with robuSt Setae; baSiS marginally longer in femaleS, narrowing proximally in maleS, Slightly leSS So in femaleS, poSterior margin weakly convex in maleS, nearly Straight in femaleS; iSchium Short; meruS poSterior margin convex, not produced into a lobe; carpuS with heavily SetoSe lobe produced on poSterior margin, lobe Slightly Smaller in femaleS; propoduS 0.6–0.7 timeS length of carpuS, heavily armed with robuSt Setae, weakly broadening diStally but not into diStinct lobe, palm Slightly longer in maleS; dactyluS Subequal in length to palm in maleS, Slightly longer than palm in femaleS, Subchelate.

Gnathopod 2 ( FigS 17 View FIGURE 17 , 18 View FIGURE 18 ) weakly Sexually dimorphic. Coxa aS wide aS deep, ventral margin convex, ventral and poSteroventral marginS with Small robuSt Setae, poSterior margin with Subacute proceSS; baSiS Slightly longer in femaleS, narrowing proximally along anterior margin in both SexeS, alSo Slightly narrowing along poSterior margin in maleS; iSchium narrow; meruS Slightly Shorter than iSchium, produced poSterodiStally into lobe covered in palmate Setae; carpuS elongate with lobe covered in palmate Setae poSterodiStally; propoduS mitten-Shaped, approximately 0.8 timeS length of carpuS, weakly broadening diStally, lobe apically rounded and broad; dactyluS Short.

Pereopod 3 ( Fig. 18 View FIGURE 18 ) coxa Slightly wider than deep, anterodiStal corner rounded, ventral margin nearly Straight with Short robuSt Setae, poSterodiStal corner curving to form Subacute proceSS; baSiS narrowing proximally; iSchium Short; meruS weakly broadening diStally; carpuS approximately 0.6 timeS length of meruS; propoduS Slightly longer than carpuS, weakly narrowing diStally.

Pereopod 4 ( Fig. 18 View FIGURE 18 ) coxa wider than deep, anterodiStal corner rounded, ventral margin nearly Straight with Short robuSt Setae, poSterodiStal corner curving to form Subacute proceSS; baSiS broadening diStally; iSchium Short; meruS broadening diStally; carpuS approximately 0.7 timeS length of meruS; propoduS Slightly longer than carpuS, narrowing diStally; dactyluS poSterior margin weakly pinched.

Pereopod 5 ( Fig. 19 View FIGURE 19 ) coxa ventrally bilobate, anterior lobe larger; baSiS Subovate; iSchium Short; meruS broadening diStally; carpuS Subequal in length to meruS; propoduS approximately 1.2 timeS longer than carpuS, weakly narrowing diStally.

Pereopod 6 ( Fig. 19 View FIGURE 19 ) coxa ventral margin weakly convex, poSterodiStal corner rounded with few robuSt Setae; baSiS Subovate to elliptic; iSchium Short; meruS broadening diStally; carpuS Slightly Shorter than meruS; propoduS approximately 1.3 timeS longer than carpuS, Slender.

Pereopod 7 ( Fig. 19 View FIGURE 19 ) longer than pereopod 6; coxa Small, wider than deep, ventral margin convex; baSiS broadly Subovate, poSterior margin with minute SerrationS each with a Small robuSt Seta; iSchium Short; meruS weakly narrowing proximally; carpuS Slightly longer than meruS, weakly broadening diStally; propoduS approximately 1.3 timeS longer than carpuS.

Oostegites ( Fig. 19 View FIGURE 19 ) preSent on gnathopod 2 and pereopodS 3–5, weakly SetoSe (with 5–14 Setae). OoStegite on gnathopod 2 elongate, Slender, anterior margin with concave excavation proximally. OoStegiteS on pereopodS 3 and 4 longer, expanded diStally. OoStegite on pereopod 5 narrowing diStally.

Gills ( Fig. 20 View FIGURE 20 ) preSent on gnathopod 2 and pereopodS 3–6. Gill on gnathopod 2 mutlilobate, broad, folded diStally. Gill on pereopod 3 Simple, elongate, broader proximally, narrowing diStally. Gill on pereopod 4 folded and twiSted medially. Gill on pereopod 5 folded and twiSted proximally and medially, diStinct lobe preSent diStally. Gill on pereopod 6 largeSt, convoluted and expanded proximally, Small lobe near baSe, long and broad proceSS extendS poSteroventrally terminating aS a Slender extenSion with Subacute tip, diStinct Subapical lobe preSent.

Pleopods 1–2 ( Fig. 20 View FIGURE 20 ) well developed, biramouS, and Subequal; peduncle without long marginal Setae but with Short fine marginal Setae diStally; inner ramuS 0.1–0.2 timeS longer than outer ramuS, longeSt ramuS on each pleopod approximately 0.8 timeS length of peduncle. Pleopod 3 ( Fig. 20 View FIGURE 20 ) veStigial; peduncle reduced, 2–4 timeS longer than wide at baSe; rami abSent.

Epimeron 1 (Fig. 15) Shorter than epimera 2–3, poSteroventral corner almoSt a right angle. Epimeron 2 (Fig. 15) longeSt, poSteroventral corner Sharp, almoSt a right angle, with Small Subacute proceSS, poSterior margin with tiny Setae. Epimeron 3 (Fig. 15) anteroventral corner rounded, ventral margin convex, poSteroventral corner with Small Subacute proceSS, poSterior margin with minute SerrationS and tiny Setae.

Uropods 1–3 not Sexually dimorphic. Uropod 1 ( Fig. 20 View FIGURE 20 ) peduncle lateral margin with 2 large dorSal robuSt Setae (occaSionally a third, Smaller robuSt Seta proximally), meSial margin with 1 large Subapical robuSt Seta, occaSionally a Small dorSal robuSt Seta diStally, diStolateral robuSt Seta 0.35–0.5 timeS length of outer ramuS; rami approximately 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 3 dorSal robuSt Setae.

Uropod 2 ( Fig. 20 View FIGURE 20 ) peduncle 0.5–0.6 timeS length of uropod 1 peduncle, narrowing diStally, lateral margin with 1 large dorSal robuSt Seta diStally and 1 Subapical robuSt Seta, occaSionally a Small robuSt Seta proximally, meSial margin with one Small to medium Subapical robuSt Seta; rami Subequal in length to peduncle with long and Short Subapical and apical Stout robuSt Setae, outer ramuS with 3 (occaSionally 2 or 4) dorSal robuSt Setae, inner ramuS with two (occaSionally 3) dorSal robuSt Setae.

FIGURE. 15. Waematau reinga Duncan, 1994 , female MNZ CR.023908 (Whole animal), Kohuroa (A), Northland; male MNZ CR.023912 (antennae), Kohuroa (A), Northland.

FIGURE. 16. Waematau reinga Duncan, 1994 , female MNZ CR.023908 (all mouthparts except maxilliped), Kohuroa (A), Northland; male MNZ CR.023912 (maxilliped), Kohuroa (A), Northland.

Uropod 3 ( Fig. 20 View FIGURE 20 ) peduncle with one long lateral robuSt Seta; ramuS moderately elongate, approximately 0.7 timeS length of peduncle, with 1 medium lateral robuSt Seta diStally, 1 long Subapical robuSt Seta and 1 Small apical robuSt Seta.

Telson ( Fig. 20 View FIGURE 20 ) Slightly longer than wide, apically weakly inciSed, ventral longitudinal furrow preSent, 3–4 Short to medium robuSt Setae apically, and 4 medium to long marginal or Submarginal robuSt Setae in angled pairS dorSally and dorSolaterally on each Side.

Habitat. Predominantly native foreSt. Rarely in Pinus radiata plantation foreStS. Not recorded from native Shrubland.

Distribution. North ISland, Northland: Tapotupotu, Radar BuSh, Kohuroa, Unuwhao, Te Huka, Haupatoto, Whakapaku, North Cape.

Remarks. The original deScription of W. reinga by Duncan (1994) requireS little refinement, apart from noting that the diStolateral robuSt Seta of uropod 1 waS unuSually long in the type SpecimenS. Duncan (1994) Stated that the Seta reached half way or more along the rami, whereaS the more uSual State appearS to be Shorter than half way. Waematau reinga cloSely reSembleS W. kohuroa and W. rereke . TheSe three SpecieS are weakly Sexually dimorphic and poSSeSS a firSt antenna that haS a geniculate penultimate article. Additionally, pleopodS 1 and 2 are well developed and biramouS, whereaS pleopod 3 iS veStigial. Furthermore, the morphology and Setation of the telSon and uropodS are Similar, and gillS 2–5 are alike. With the exception of the veStigial third pleopod and the morphology and Setation of the telSon, W. reinga alSo ShareS theSe traitS with W. ringanohinohi . Key morphological differenceS between all four SpecieS are outlined in Table 3. Female W. reinga were Significantly longer than maleS (Table 4).