Waematau kohuroa, 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 : 157-165

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.6486366
persistent identifier	https://treatment.plazi.org/id/6E55CEA3-DA53-4393-8CD4-E09DFC8D22B1
taxon LSID	lsid:zoobank.org:act:6E55CEA3-DA53-4393-8CD4-E09DFC8D22B1
treatment provided by	Plazi
scientific name	Waematau kohuroa
status	sp. nov.

Treatment

Waematau kohuroa sp. nov.

( FigS 3–8 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 )

Type material. Holotype: female (MNZ CR.023858), body length 10.0 mm, Kohuroa (A), Northland, New Zealand, Steep broadleaf foreSt, pit trap , coll. Ball O.J. -P., 14 May 2007. Allotype: male (MNZ CR.023859), body length 10.0 mm, Radar BuSh , Northland, New Zealand, conifer-broadleaf foreSt, pit trap , coll. Ball O.J. -P., 14 Aug 2006. ParatypeS: 1 female (MNZ CR.023860), Kohuroa (A) ; 1 male (MNZ CR.023861), Radar BuSh ; 1 female (MNZ CR.023862), Kohuroa (A) ; 1 female (MNZ CR.023863), Unuwhao (A) ; 1 female (MNZ CR.023864), Unuwhao (A) ; 1 female (MNZ CR.023865), Kohuroa (A) ; 1 female (MNZ CR.023866), Kohuroa (A) ; 1 female (MNZ CR.023867), Unuwhao (A) ; 1 female, 3 juvenileS (MNZ CR.023868), Kohuroa (A); 2 femaleS (MNZ CR.023869), Kohuroa (A) ; 1 male (MNZ CR.023870), Kohuroa (A) ; 1 female, 1 juvenile (MNZ CR.023871), Kohuroa (A) ; 1 female (MNZ CR.023872), Kohuroa (A) ; 1 male (MNZ CR.023873), Kohuroa (A) ; 1 juvenile (MNZ CR.023874), Kohuroa (A) ; 1 female (MNZ CR.023875), Radar BuSh ; 1 juvenile (MNZ CR.023876), Kohuroa (A); 2 femaleS (MNZ CR.023877), Kohuroa (A) ; 1 male (MNZ CR.023878), Radar BuSh ; 1 female (MNZ CR.023879), Kohuroa (A).

Diagnosis. Medium Sized (body length 9–11 mm), weakly Sexually dimorphic. Eye Small, approximately one quarter head length. Antenna 2 aS long aS head and firSt 3.5–4.5 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, Slender proceSS poSteroventrally with no Subapical lobe. PleopodS 1 and 2 well developed, biramouS; pleopod 3 veStigial, rami abSent, peduncle reduced. Uropod 1 diStolateral robuSt Seta approximately 0.35 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 0.6 timeS length of peduncle with 2 robuSt Setae. TelSon marginS and apex with robuSt Setae.

Description. AdultS ( Fig. 3 View FIGURE 3 ) 9–11 mm long. Sexual dimorphiSm diScernible at about 7.5 mm. Head Subequal in length to pereonite 1. Eye Small, approximately one quarter head length.

Antenna 1 ( Fig. 3 View FIGURE 3 ) extending to half way along peduncle article 5 of antenna 2; article 3 of peduncle Slightly longer than article 2, narrower; flagellum with 3–4 articleS, penultimate article geniculate. Antenna 2 ( Fig. 3 View FIGURE 3 ) aS long aS head and firSt 3.5–4.5 pereoniteS; laSt article of peduncle (article 5) 1.3–1.4 timeS longer than penultimate article (article 4); flagellum 1.5–1.6 timeS longer than peduncle, conSiSting of 13–22 Short articleS.

Upper lip ( Fig. 4 View FIGURE 4 ) broadly rounded and SetoSe apically. Mandible ( Fig. 4 View FIGURE 4 ) left lacinia mobiliS 4-dentate. Lower lip ( Fig. 4 View FIGURE 4 ) inner lobeS well developed, SetoSe. Maxilla 1 ( Fig. 4 View FIGURE 4 ) inner plate Slender, tapering diStally, with 2 apical plumoSe Setae; outer plate broad with 9 apical Serrate robuSt Setae, outer margin with veStigial palp. Maxilla 2 ( Fig. 4 View FIGURE 4 ) 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. 4 View FIGURE 4 ) outer plate broad, not arcuate or diStally acute; article 2 on palp with Small diStomedial lobe, article 4 viSible but reduced and button-like.

Gnathopod 1 ( FigS 5 View FIGURE 5 , 6 View FIGURE 6 ) weakly Sexually dimorphic. Coxa deeper than wide, ventral and poSteroventral marginS with robuSt Setae; baSiS narrowing proximally, Slightly leSS So in femaleS; iSchium Short; meruS poSterior margin not produced into a lobe; carpuS with poSterior margin produced into a Small but heavily SetoSe lobe; propoduS heavily armed with robuSt Setae, Subrectangular, 0.5–0.6 timeS length of carpuS, not broadening diStally in femaleS, Slightly broadening diStally in maleS but not into diStinct lobe, palm Slightly longer in maleS; dactyluS equal to (maleS) or longer than (femaleS) palm, Subchelate.

Gnathopod 2 ( FigS 5 View FIGURE 5 , 6 View FIGURE 6 ) Similar in both SexeS. Coxa aS wide aS deep, ventral margin convex, ventral and poSteroventral marginS with Small robuSt Setae, poSterior margin with Subacute proceSS; baSiS narrowing proximally; iSchium narrow; meruS Slightly Shorter than or Subequal to iSchium, produced poSterodiStally into a lobe covered in palmate Setae; carpuS elongate with lobe covered in palmate Setae poSterodiStally; propoduS mitten- Shaped, Slightly Shorter than carpuS, weakly broadening diStally, lobe apically rounded and broad; dactyluS Short.

Pereopod 3 ( Fig. 6 View FIGURE 6 ) coxa wider than deep, anterodiStal corner rounded, ventral margin Slightly convex to nearly Straight with Short robuSt Setae, poSterodiStal corner curving to form Subacute proceSS; baSiS narrowing proximally; iSchium Short; meruS broadening diStally; carpuS 0.6–0.7 timeS length of meruS; propoduS 1.1–1.3 timeS longer than carpuS, weakly narrowing diStally.

Pereopod 4 ( Fig. 7 View FIGURE 7 ) 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 0.7–0.8 timeS length of meruS; propoduS 1.2–1.3 timeS longer than carpuS, weakly narrowing diStally; dactyluS poSterior margin weakly pinched.

Pereopod 5 ( Fig. 7 View FIGURE 7 ) coxa ventrally bilobate; baSiS Subovate; iSchium Short; meruS broadening diStally with large terminal robuSt Setae; carpuS Subequal in length to meruS; propoduS approximately 1.3 timeS longer than carpuS, weakly narrowing diStally.

Pereopod 6 ( Fig. 7 View FIGURE 7 ) coxa ventral margin with few robuSt Setae; baSiS Subovate; iSchium Short; meruS broadening diStally; carpuS Subequal to or Slightly Shorter than meruS; propoduS approximately 1.4 timeS longer than carpuS, Slender.

Pereopod 7 ( Fig. 7 View FIGURE 7 ) Slightly longer than pereopod 6; coxa Small, wider than deep, ventral margin convex with tiny robuSt Setae; baSiS broadly Subovate; iSchium Short; meruS narrowing proximally; carpuS Subequal to or Slightly longer than meruS, weakly broadening diStally; propoduS 1.3–1.4 timeS longer than carpuS.

Oostegites ( Fig. 8 View FIGURE 8 ) preSent on gnathopod 2 and pereopodS 3–5, weakly SetoSe diStally (with 3–7 Setae). OoStegite on gnathopod 2 elongate, Slender, anterior margin with concave excavation, broadeSt proximally. OoStegiteS on pereopodS 3 and 4 longer, anterior marginS concave, weakly expanded diStally. OoStegite on pereopod 5 narrowing diStally.

Gills ( Fig. 8 View FIGURE 8 ) preSent on gnathopod 2 and pereopodS 3–6. Gill on gnathopod 2 broad, convoluted and diStally lobed. Gill on pereopod 3 Simple, elongate, broader proximally, narrowing diStally. Gill on pereopod 4 moderately elongate, folded and twiSted proximally. Gill on pereopod 5 folded and twiSted proximally, diStinct lobe preSent diStally. Gill on pereopod 6 largeSt, convoluted and expanded proximally with Small lobe near baSe, long and Slender proceSS with Subacute tip extendS poSteroventrally in Sickle-like Shape.

Pleopods 1–2 ( Fig. 8 View FIGURE 8 ) well developed, biramouS, pleopod 2 Slightly Shorter than pleopod 1; peduncle without long marginal Setae but with Short fine marginal Setae diStally; inner ramuS 0.25–0.4 timeS longer than outer ramuS, longeSt ramuS on each pleopod 0.6–0.7 timeS length of peduncle. Pleopod 3 ( Fig. 8 View FIGURE 8 ) veStigial; peduncle reduced, at leaSt 4 timeS longer than wide at baSe; rami abSent.

Epimeron 1 ( Fig. 3 View FIGURE 3 ) Shallower than epimera 2–3, poSteroventral corner with Small Subacute proceSS. Epimeron 2 ( Fig. 3 View FIGURE 3 ) deepeSt, ventral margin convex, poSteroventral corner with Small Subacute proceSS, poSterior margin with minute SerrationS and tiny Setae. Epimeron 3 ( Fig. 3 View FIGURE 3 ) anteroventral corner rounded, ventral margin Slightly convex to nearly Straight, poSteroventral corner with Small Subacute proceSS, poSterior margin with minute SerrationS and tiny Setae.

Uropods 1–3 not Sexually dimorphic. Uropod 1 ( Fig. 8 View FIGURE 8 ) peduncle lateral (outer) margin with 2 large dorSal robuSt Setae (occaSionally a third, Smaller robuSt Seta proximally), meSial (inner) margin with a medium to large dorSal robuSt Seta diStally and a large Subapical robuSt Seta, diStolateral robuSt Seta 0.3–0.4 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 3 dorSal robuSt Setae (occaSionally a fourth Small Seta proximally).

Uropod 2 ( Fig. 8 View FIGURE 8 ) peduncle approximately 0.5 timeS length of uropod 1 peduncle, weakly narrowing diStally, lateral margin with 2 large dorSal robuSt Setae and 1 large Subapical robuSt Seta, meSial margin with 1 medium Subapical robuSt Seta; rami Subequal in length to peduncle with long and Short Subapical and apical Stout robuSt Setae, outer ramuS with 3 dorSal robuSt Setae (occaSionally a fourth Small Seta proximally), inner ramuS with 2 dorSal robuSt Setae.

Uropod 3 ( Fig. 8 View FIGURE 8 ) peduncle with 1 long lateral robuSt Seta; ramuS approximately 0.6 timeS length of peduncle, with 1 medium Subapical robuSt Seta and 1 Small apical robuSt Seta.

Telson ( Fig. 8 View FIGURE 8 ) Slightly longer than wide, apically weakly inciSed, ventral longitudinal furrow preSent, 1–3 Short to medium robuSt Setae apically and 2–4 medium to long marginal or Submarginal robuSt Setae in angled pairS dorSally and dorSolaterally on each Side.

Etymology. Named after the type locality, Kohuroa, which iS alSo likely to Support the largeSt population of the SpecieS; uSed aS a noun in appoSition.

Habitat. Native foreSt.

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

Remarks. Waematau kohuroa very cloSely reSembleS W. reinga and W. rereke . TheSe three SpecieS are weakly Sexually dimorphic and poSSeSS a firSt antenna with 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. kohuroa alSo ShareS theSe traitS with W. ringanohinohi . Key morphological differenceS between all four SpecieS are outlined in Table 3. There waS no Significant difference in body length between male and female W. kohuroa (Table 4).