Paraplatyarthrus nahidae Javidkar and King

Javidkar, Mohammad, King, Rachael A., Cooper, Steven J. B., Humphreys, William F. & Austin, Andrew D., 2017, Taxonomy of Paraplatyarthrus Javidkar and King (Isopoda: Oniscidea: Paraplatyarthridae) with description of five new species from Western Australia, and comments on Australian Trichorhina Budde-Lunde, 1908 (Platyarthridae), Zootaxa 4243 (3), pp. 401-431 : 414-418

publication ID	https://doi.org/ 10.11646/zootaxa.4243.3.1
publication LSID	lsid:zoobank.org:pub:06BB3BA9-E53C-4EF9-BD58-B853BF64B88D
DOI	https://doi.org/10.5281/zenodo.5671354
persistent identifier	https://treatment.plazi.org/id/09F086DD-1E71-4CCE-92C1-1E1E1B7A2D0F
taxon LSID	lsid:zoobank.org:act:09F086DD-1E71-4CCE-92C1-1E1E1B7A2D0F
treatment provided by	Plazi
scientific name	Paraplatyarthrus nahidae Javidkar and King
status	sp. nov.

Treatment

Paraplatyarthrus nahidae Javidkar and King View in CoL , sp. nov.

Figs 11–13 View FIGURE 11 View FIGURE 12 View FIGURE 13 , 2 View FIGURE 2 D, 20A

urn:lsid:zoobank.org:act:09F086DD-1E71-4CCE-92C1-1E1E1B7A2D0F

Type material. Holotype: Male ( WAM C 54785, JA100), Mt Morgans calcrete, Eastern Murchison region , Western Australia, Australia; 28.73272°S, 122.15430°E, 8 Aug 2011, coll. M. Javidkar & W.F. Humphreys. GoogleMaps

Paratypes: 2 males (WAM C 54786, JA103; WAM C 54787, JA105); 1 female (WAM C 54788, JA104); 2 additional paratype specimens (WAM C 54817, JA101; WAM C 54818, JA102) are kept on SEM stubs (WAM). Same locality and collection data as holotype.

Diagnosis. Body fully pigmented (surface species). Posterior point of male pleopod 1 exopodite developed. Single nodulus lateralis on profrons of cephalon. Cephalic lateral lobes enlarged.

Description. Male (WAM C 54785), Body length 5.0 mm, fully pigmented from head to pleotelson ( Fig. 2 View FIGURE 2 D). Cephalon lateral lobes enlarged, with straight sides and apex ( Fig. 11 View FIGURE 11 H). Single nodulus lateralis occurring on profrons. Eyes with 5 ommatidia. Antenna 1 with medial article shortest, distal article longest ( Fig. 11 View FIGURE 11 A). Antenna 2 flagellum with basal article short, less than half length of distal article (about 0.35 of distal) ( Fig. 11 View FIGURE 11 B). Left mandible ( Fig. 11 View FIGURE 11 C) pars molaris with tuft of 6 plumose setae; hairy lobe bearing 2 plumose setae, top covered with small fine setae, with few fine setae down the lobe. Right mandible pars molaris with several long to short plumose setae (about 8); 1 plumose seta on hairy lobe; several very fine setae between hairy lobe and pars molaris. Maxilla 1 outer endite ( Fig. 11 View FIGURE 11 D) with outer group of 4 teeth covering about 67% of marginal area, inner group of 4 cleft teeth and 1 simple tooth; inner endite ( Fig. 11 View FIGURE 11 E) with no fine setae on subapical outer marginal corner. Maxilla 2 ( Fig. 11 View FIGURE 11 F) apically bilobate; inner lobe relatively large, inner and outer lobes delimited by fine suture. Maxillipedal endite ( Fig. 11 View FIGURE 11 G) with 1 large seta close to subapical inner corner; distal articles of palp with 1 large proximal seta, medial tuft of 2 large and 2 smaller setae and apical tuft of few long setae; outer margin of palp with 1–2 fine setae.

Epimeron 1 bluntly projected anteriorly. In dorsal view, posterolateral corner of pereonites 1–3 rounded. Posterolateral corner of pereonites 4–7 posteriorly directed ( Fig. 20 View FIGURE 20 A). Noduli Laterales with B/C ratio (Appendix 2) on tergite 1 less than 0.2 (0.18); tergite 4 with noduli laterales most distant from lateral margin (D/C ratio more than 0.8); tergite 5 with noduli laterales closest to posterior margin; D/C ratios not constant in tergites 1–7 (Appendix 2).

Pereopod 1 ( Fig. 12 View FIGURE 12 A) carpus inner margin densely covered with long serrate setae, two types of long cleft setae and one simple and short recognisable, dense tuft of fine setae present medially near distal margin; propodus with both small simple and large serrate setae; dactylus with long narrow seta not exceeding claws, outer claw relatively straight. Pereopod 7 ( Fig. 12 View FIGURE 12 B) carpus not showing any sexual dimorphism.

Pleon outline continuous with pereon ( Fig. 2 View FIGURE 2 D). Pleopod 1 endopodite ( Fig. 13 View FIGURE 13 A) moderately apically acute, with narrow spermatic furrow and row of very small spine-like setae along medial margin; exopodite ( Fig. 13 View FIGURE 13 B) with prominent posterior point and no marginal setae. Genital papilla ( Fig. 13 View FIGURE 13 A) ventral sheath apically rounded and surpassed by long rounded-tip lobe. Pleopod 2 endopodite ( Fig. 13 View FIGURE 13 C) long, reaching to base of pleopod 5, with small depression on medial endopodite, with tuft of very fine setae posteriorly. Pleopods 2–5 ( Fig. 13 View FIGURE 13 D–G) exopodites with 5–6 marginal long serrate setae. Pleotelson pointed ( Fig. 2 View FIGURE 2 D). Uropodal exopodites well developed, longer than pleotelson; endopodites slightly exceeding pleotelson; sympodite ( Fig. 12 View FIGURE 12 C) with elongated suture.

Etymology. This species is named for Nahid Shokri (wife of M. Javidkar), for her significant support during this research.

Remarks. Paraplatyarthrus nahidae sp. nov. is a surface species, and is similar to P. crebesconiscus in having 5 ommatidia, however, the size of each ommatidium is larger and fully developed in P. nahidae . This species is easily distinguished from the rest of described Paraplatyarthrus species based on its fully pigmented body, the male pleopod 1 exopodite having a posterior point developed, and the cephalic lateral lobes being enlarged. The body length varies between 4.5 mm and 5.5 mm. This species was referred to as Taxon 1 in Javidkar et al. (2015). It has been recorded from Mt Morgans borefield, Eastern Murchison region, Western Australia.