Paraplatyarthrus crebesconiscus 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: 409-411

publication ID

https://doi.org/10.11646/zootaxa.4243.3.1

publication LSID

lsid:zoobank.org:pub:06BB3BA9-E53C-4EF9-BD58-B853BF64B88D

persistent identifier

http://treatment.plazi.org/id/770E92F4-8569-49BA-B9C7-FB5630513FEE

taxon LSID

lsid:zoobank.org:act:770E92F4-8569-49BA-B9C7-FB5630513FEE

treatment provided by

Plazi

scientific name

Paraplatyarthrus crebesconiscus Javidkar and King
status

sp. nov.

Paraplatyarthrus crebesconiscus Javidkar and King   , sp. nov.

Figs 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7 , 2A View FIGURE 2 , 20 View FIGURE 20 B

urn:lsid:zoobank.org:act:770E92F4-8569-49BA-B9C7-FB5630513FEE

Type material. Holotype: Male , WAM C 54789 View Materials (BES16478.3), Halfpenny Well calcrete, Millbillillie pastoral station, Eastern Murchison region, Western Australia, Australia, 27.69661°S, 121.33953°E, Oct 2011, coll. W. F. Humphreys & S. J. B. Cooper GoogleMaps   .

Paratypes: 3 females (WAM C 54790, BES16478.2; WAM C 54791, BES16478.4; WAM C 54792, BES16478.5), 1 male ( WAM C 54793 View Materials , BES16478.1) (same locality and collection data as holotype)   ; 1 female (WAM C 66918, BES15072.1) (same calcrete as holotype), 27.69661°S, 121.33953°E, Mar 2009, coll. W. F. Humphreys & S.J.B. Cooper; 1 female ( WAM C 66919, BES15073), Nambi calcrete, Eastern Murchison region, Western Australia, Australia, 28.22232°S, 121.82014°E, Mar 2009, coll. W.F. Humphreys & S.J.B. Cooper GoogleMaps   ; 1 female ( WAM C 66920 View Materials , BES17224.1), Laverton Downs Calcrete-Windarra , Eastern Murchison region, Western Australia, Australia, 28.50517°S, 122.18038°E, May 2012, coll. W.F. Humphreys & S.J.B. Cooper GoogleMaps   ; 1 specimen, Gender indeterminate ( WAM C 66917, BES15072) (same calcrete as holotype), 27.69661°S, 121.33953°E, Mar 2009, coll. W.F. Humphreys & S.J.B. Cooper GoogleMaps   ; 1 specimen, Gender indeterminate ( WAM C 66921 View Materials , BES17224.2), Laverton Downs Calcrete-Windarra, Eastern Murchison region, Western Australia, Australia, 28.50517°S, 122.18038°E, May 2012, coll. W.F. Humphreys & S.J.B. Cooper GoogleMaps   .

Diagnosis. Eyes with 5 ommatidia. Cephalic lateral lobes not developed. Male pleopod 1 exopodite with weak posterior point.

Description. Male ( WAM C 54789 View Materials ). Body length 2.7 mm, cephalon and posterior body weakly pigmented. Cephalic lateral lobes small. Eyes with 5 black ommatidia.

Antenna 1 with medial article shortest, distal article longest ( Fig. 5 View FIGURE 5 A). Antenna 2 flagellum with basal article shorter, about 1/3 length of distal article ( Fig. 5 View FIGURE 5 B).

Left mandible pars molaris ( Fig. 5 View FIGURE 5 C) with 6 to 7 plumose setae; hairy lobe bearing 2 plumose setae. Right mandible pars molaris with about 6 plumose setae; 1 plumose seta on hairy lobe. Maxilla 1 outer endite ( Fig. 5 View FIGURE 5 D) with outer group of 4 teeth covering about 65% of marginal area, inner group of 3 cleft teeth, 1 simple and 1 stalklike tooth; inner endite ( Fig. 5 View FIGURE 5 E) with 2 very fine setae on subapical outer marginal corner. Maxilla 2 ( Fig. 5 View FIGURE 5 F) apically bilobate; inner lobe comparatively smaller than outer one; inner and outer lobes delimited by fine suture. Maxillipedal endite with 1 large seta close to subapical inner corner; distal articles of palp with 1 large proximal seta, medial tuft of 2 large and 1 small setae and apical tuft of probably 2 long setae ( Fig. 5 View FIGURE 5 G).

Epimeron 1 rounded anteriorly. In dorsal view, posterolateral corner of pereonites 1–4 rounded. Posterolateral corner of pereonites 5–7 posteriorly directed ( Fig. 20 View FIGURE 20 B). Pleonal epimeron 5 reaching (but not surpassing) uropodal sympodite. Noduli laterales with D/C ratios not constant in tergites 1–7.

Pereopod 1 ( Fig. 6 View FIGURE 6 A) carpus inner margin densely covered with long serrate setae, tuft of fine setae present medially near distal margin; propodus with both small simple and large serrate setae; dactylus with long seta not exceeding claws, outer claw relatively straight, with small depression on medial part. Pereopod 7 ( Fig. 6 View FIGURE 6 B) carpus not showing any sexual dimorphism.

Pleon outline continuous with pereon. Pleopod 1 endopodite ( Fig. 7 View FIGURE 7 A) slender, with simple apex, medial margin with group of fine setae, very fine setae also close to tip of endopodite; exopodite ( Fig. 7 View FIGURE 7 B) heart-shaped with posterior point not developed. Genital papilla ( Fig. 6 View FIGURE 6 C) ventral sheath apically pointed, surpassed by long rounded lobe. Pleopod 2 endopodite ( Fig. 7 View FIGURE 7 C) with distal half slender, not reaching to posterior apex of pleopod 4 exopodite. Pleopod 2–5 exopodites ( Fig. 7 View FIGURE 7 D –G) with 4 to 5 cleft and simple long setae. Pleotelson triangular and pointed. Uropodal exopodites surpassing pleotelson; endopodites slightly exceeding pleotelson; uropodal sympodite with elongated circumflex-shaped incision.

Etymology. The species name is composed of the Latin word ‘crebesco’ (meaning widespread) and ‘oniscus’, referring to its comparatively widespread distribution in the calcrete aquifers.

Remarks. Paraplatyarthrus crebesconiscus   sp. nov. appears in the same clade with P. nahidae   sp. nov. ( Fig. 1 View FIGURE 1 ) from which it has a 12.3% COI divergence (Appendix 1). Unlike P. nahidae   , the body is semi-pigmented to pale, cephalic lobes are not developed on the head, and male pleopod 1 exopodite has a weak posterior point. The body length varies between 2.7 mm and 3.5 mm. Some individuals have slightly stronger pigmentation on the dorsal body ( Fig. 2A View FIGURE 2 ). It has been recorded from calcrete aquifers at Halfpenny Well (Millbillillie pastoral station), Nambi pastoral station and Laverton Downs pastoral station (Mt Windarra), and the Eastern Murchison region of Western Australia.

WAM

Western Australian Museum

COI

University of Coimbra Botany Department