Paraplatyarthrus occidentoniscus 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 : 418-420

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.5671356
persistent identifier	https://treatment.plazi.org/id/FDBD3D8A-A787-46F4-8056-7E136B072D8A
taxon LSID	lsid:zoobank.org:act:FDBD3D8A-A787-46F4-8056-7E136B072D8A
treatment provided by	Plazi
scientific name	Paraplatyarthrus occidentoniscus Javidkar and King
status	sp. nov.

Treatment

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

Figs 14–16 View FIGURE 14 View FIGURE 15 View FIGURE 16 , 2 View FIGURE 2 E–F, 20A

urn:lsid:zoobank.org:act:FDBD3D8A-A787-46F4-8056-7E136B072D8A

Type material. Holotype: Male, WAM C 54794 (BES15551.10), Sturt Meadows pastoral station calcrete, Eastern Murchison region , Western Australia, Australia; 28.70124°S, 120.90361°E, Jul 2010, coll. W.F. Humphreys & S.J.B. Cooper. GoogleMaps

Paratypes: 5 females (WAM C 54795, BES15551.12; WAM C 54796, BES15551.23; WAM C 54797, BES15551.4; WAM C 54798, BES15551.22; WAM C 66914, BES15551.9), 5 males ( WAM C 54799, BES15551.14; WAM C 54800, BES15551.3; WAM C 54801, BES15551.1; WAM C 54802, BES15551.17; WAM C 66913, BES15551.8) (same locality and collection data as holoptype) . 2 females (WAM C 66915, BES17225.1; WAM C 66916, BES17225.2) (same calcrete as holotype), 28.70034°S, 120.90260°E, May 2012, coll. W.F. Humphreys & S.J.B. Cooper.

Diagnosis. Cephalic lateral lobes small. Eyes with 3 black ommatidia. Male pleopod 1 exopodite with no posterior point.

Description. Male (WAM C 54794), Body pale. Cephalic lateral lobes small and rounded. Eyes with 3 black ommatidia. Antenna 1 medial article shortest, distal and basal articles approximately same size ( Fig. 14 View FIGURE 14 A). Antennal 2 flagellum ( Fig. 14 View FIGURE 14 B) with basal article shorter, about 1/3 length of distal one. Left mandible pars molaris with 5–6 plumose setae; 2 plumose setae on hairy lobe. Right mandible pars molaris ( Fig. 14 View FIGURE 14 C) with about 6 plumose setae; hairy lobe bearing 2 plumose setae on top and down lobe, with few single fine setae between 2 plumose setae. Maxilla 1 outer endite ( Fig. 14 View FIGURE 14 D) with outer group of 4 teeth covering about half of marginal area, also with inner group of 3 cleft teeth, 1 simple and 1 stalk-like tooth; inner endite ( Fig. 14 View FIGURE 14 E) with plumose setae very close to each other so they can appear as single stout plumose seta, 1 single very fine seta on subapical outer marginal corner. Maxilla 2 ( Fig. 14 View FIGURE 14 F) apically bilobate; inner lobe slightly smaller than outer one; inner and outer lobes delimited by fine suture. Maxillipedal endite ( Fig. 14 View FIGURE 14 G) with 1 large seta close to subapical inner corner; distal articles of palp with 1 large proximal seta, 2 medial large setae and apical tuft of few long setae.

Epimeron 1 rounded 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). Pleonal epimeron 5 not reaching uropodal sympodite. Tergites 6 and 7 (one distant to lateral margin) with noduli laterales closest to posterior margin.

Pereopod 1 ( Fig. 15 View FIGURE 15 A) carpus inner margin with both small simple setae and long and short serrate setae but not dense, tuft of fine setae present; propodus with both small simple and large serrate setae; dactylus with long narrow seta not exceeding claws, outer claw sickle-shaped with small depression on medial part. Pereopod 7 ( Fig. 15 View FIGURE 15 B) not showing any sexual dimorphism.

Pleon outline continuous with pereon. Pleopod 1 endopodite ( Fig. 16 View FIGURE 16 A) slender, with simple apex including very fine setae, very fine setae in medial part; exopodite ( Fig. 16 View FIGURE 16 B) heart-shaped, with no posterior point or setae on margins. Genital papilla ( Fig. 16 View FIGURE 16 A) ventral sheath apically pointed and surpassed by long distally rounded lobe. Pleopod 2 endopodite ( Fig. 16 View FIGURE 16 C) very slender; exopodite with 2 long marginal setae and very fine setae on other side ( Fig. 16 View FIGURE 16 D). Pleopod 3–5 exopodites ( Fig. 16 View FIGURE 16 E–G) with 3 simple and serrate marginal long setae.

Pleotelson triangular and pointed. Uropodal exopodites surpassing pleotelson; endopodites, inserted at approximately same level (a bit upper) as exopodites; sympodite with extended circumflex-shaped incision on outer side.

Etymology. The species name is composed of the Latin ‘occidente’ meaning west, referring to its Western Australian distribution, plus oniscus.

Remarks. Paraplatyarthrus occidentoniscus sp. nov. is distinguished from the described Paraplatyarthrus species by a combination of characters, including eyes with 3 black ommatidia, the cephalic lateral lobes being small, and the male pleopod 1 exopodite with no or a very weak developed posterior point. The body length varies between 2.0 mm and 4.5 mm, and the body pigmentation varies from semi- to weakly-pigmented to pale ( Figs. 2 View FIGURE 2 E, F). This species was referred to as Taxon 3 in Javidkar et al. (2015). It is confined to a single calcrete aquifer, Sturt Meadows pastoral station, Eastern Murchison region, Western Australia.