Paraplatyarthrus nahidae Javidkar and King, sp. nov.
Creators: name: Javidkar, Mohammad
name: King, Rachael A.
name: Cooper, Steven J. B.
name: Humphreys, William F.
name: Austin, Andrew D.
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Paraplatyarthridae
Paraplatyarthrus
Paraplatyarthrus nahidae

description: Paraplatyarthrus nahidae Javidkar and King, sp. nov.
Figs 11–13, 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.
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 D). Cephalon lateral lobes enlarged, with straight sides and apex (Fig. 11 H). Single nodulus lateralis occurring on profrons. Eyes with 5 ommatidia. Antenna 1 with medial article shortest, distal article longest (Fig. 11 A). Antenna 2 flagellum with basal article short, less than half length of distal article (about 0.35 of distal) (Fig. 11 B). Left mandible (Fig. 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 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 E) with no fine setae on subapical outer marginal corner. Maxilla 2 (Fig. 11 F) apically bilobate; inner lobe relatively large, inner and outer lobes delimited by fine suture. Maxillipedal endite (Fig. 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 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 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 B) carpus not showing any sexual dimorphism.
Pleon outline continuous with pereon (Fig. 2 D). Pleopod 1 endopodite (Fig. 13 A) moderately apically acute, with narrow spermatic furrow and row of very small spine-like setae along medial margin; exopodite (Fig. 13 B) with prominent posterior point and no marginal setae. Genital papilla (Fig. 13 A) ventral sheath apically rounded and surpassed by long rounded-tip lobe. Pleopod 2 endopodite (Fig. 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 D–G) exopodites with 5–6 marginal long serrate setae. Pleotelson pointed (Fig. 2 D). Uropodal exopodites well developed, longer than pleotelson; endopodites slightly exceeding pleotelson; sympodite (Fig. 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.
description: Published as part of 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), pp. 401-431 in Zootaxa 4243 (3) on pages 414-418, DOI: 10.11646/zootaxa.4243.3.1, http://zenodo.org/record/400092