Eocyzicus ubiquus, Tippelt & Schwentner, 2018

Tippelt, Lisa & Schwentner, Martin, 2018, Taxonomic assessment of Australian Eocyzicus species (Crustacea: Branchiopoda: Spinicaudata), Zootaxa 4410 (3), pp. 401-452: 413-417

publication ID

https://doi.org/10.11646/zootaxa.4410.3.1

publication LSID

lsid:zoobank.org:pub:F81EF784-209A-4933-932D-0A507BA85E2B

persistent identifier

http://treatment.plazi.org/id/039FB973-FFFB-9125-A180-F93CC550FCFD

treatment provided by

Plazi

scientific name

Eocyzicus ubiquus
status

sp. nov.

Eocyzicus ubiquus   sp. nov.

( Figs. 5 View FIGURE 5 and 6 View FIGURE 6 )

Eocyzicus   lineage U Schwentner et al., 2014, 2015b

Etymology. The species name is derived from the Latin word "ubique", which means everywhere. This refers to the fact that this species occurs in a wide range of different aquatic habitats types (see also "Ecology").

Type locality. New South Wales, Murray-Darling Basin , Paroo River catchment, Bloodwood Station, Sues Pan, 29°29´05.6´´S, 144°48´38.0´´E. GoogleMaps  

Type material. Holotype. Male (AM P.89515, GenBank KC583880).

Allotype. Female (AM P.89517, GenBank KC583882).

Paratypes. 1 male (AM P.89515, GenBank KC583883), 2 females (AM P.89516, GenBank KC583881; AM P.89519, GenBank KC583884), collected by M. Schwentner, S. Richter and B. V. Timms, 21-II-2011.

Further material examined. New South Wales: 1 male (AM P.89491) Turbid pool, 29°32´29.3´´S, 146°24´50.1´´E, 21-I-2010 GoogleMaps   ; 1 male (AM P.89462) Vegetated pool 1, Muella Station , 29°31´10.3´´S, 144°56´21.8´´E, 31-III-2009 GoogleMaps   ; 1 male (AM P.89513) Lismore Bore, Muella Station , 29°31´50.7´´S, 144°59´28.1´´E, 19-I-2010 GoogleMaps   ; 1 male (AM P.89463), 1 female (AM P.89464) Yantabulla black box swamp, 29°20´18.0´´S, 145°00´12.1´´E, 31-III-2009 GoogleMaps   ; 1 female (AM P.89478) Black box swamp near Cumeroo , 29°15´41.2´´S, 145°09´29.0´´E, 20-I-2010 GoogleMaps   ; 1 male (AM P.89484) Gerara composite swamp, 29°11´47.0´´S, 146°17´03.0´´E, 21-I- 2010 GoogleMaps   ; 1 male (AM P.89501) Freshwater Lake, Bloodwood Station , 29°29´14.7´´S, 144°49´59.0´´E, 19-II-2010 GoogleMaps   ; 1 female (AM P.89470) Upper Crescent Pool, Bloodwood Station , 29°32´33.6´´S, 144°52´16.5´´E, 19-I-2010 GoogleMaps   ; 1 female (AM P.89461) East of Lake Lauradale, northwest of Bourke , 29°51´22´´S, 145°38´49´´E, 29-III-2009 GoogleMaps   ; Western Australia: 1 male (AM P.89514) Samphire swamp a few km south of Onslow , 21°43´S, 115°05´E, 14-III- 2009 GoogleMaps   ; Queensland: 1 male (AM P.89496) Cane grass swamp 75 km east of Wyandra , 27°23´03.5´´S, 146°36´33.7´´E, 17-II-2010 GoogleMaps   ; 1 male (AM P.89528), 1 female (AM P.89525) Old borrow pit 8 km east of Boulia , 22°55´44.6´´S, 139°58´23.7´´E, 0 4-III-2011 GoogleMaps   ; 1 female (AM P.89498) Grassy turbid swamp 10 km from Bollon Rd Junction , 27°41´52.4´´S, 146°45´44.7´´E, 18-II-2010 GoogleMaps   ; 1 female (AM P.89520) Floodout of Dam, 84km south of Thargomindah , 28°39´46.7´´S, 143°48´40.8´´E, 26-II-2011 GoogleMaps   .

Description. Holotype male. ( Fig. 5a, c and d View FIGURE 5 ). Carapace. 5.0 mm high, 7.0 mm long, height/length ratio 0.64; height without "crowded" growth lines 4.1 mm; length without "crowded" growth lines 6.3 mm; shape oval; dorso-posterior corner clearly present; 21 growth lines, of these 19 "non-crowded" and two "crowded"; umbo large, hemispheric, growth lines on umbo present ( Fig. 5a View FIGURE 5 ).

Head. Condyle rounded, section between condyle and external eye contour straight; eye bulge absent, compound eye round; straight angle between head and rostrum; anterior margin of rostrum straight, transition between anterior and ventral margin rounded ( Fig. 5c View FIGURE 5 ). Antennule with 22 lobules, widely arranged; reaches to 10th antennary segment. Antenna with twelve antennary segments, middle antennary segment anteriorly with five spines.

Thorax. 20 thorax segments, of these 18 "complete" and two "incomplete" ( Fig. 5d View FIGURE 5 ); dorsal spines beginning at 8th thorax segment, eleven thorax segments with dorsal spines; one dorsal spine at each thorax segment; first dorsal spine smaller than following one, last dorsal spine same size as the preceding one, last "complete" thorax segment with dorsal spine ( Fig. 5d View FIGURE 5 ).

Telson. 13 telsonic spines, of these three enlarged, telsonic spines end at base of apex; telson symmetric; telsonic filaments situated at the third telsonic spine. Furca with 13 setae, longer than proximal part of furca; small spine before row of spinules present, spinules long ( Fig. 5d View FIGURE 5 ).

Allotype female. ( Fig. 5b, e and f View FIGURE 5 ). Carapace. 4.4 mm high, 6.8 mm long; height/length ratio 0.65; 18 growth lines, of these 16 "non-crowded" and two "crowded"; umbo small ( Fig. 5b View FIGURE 5 ).

Head. Section between condyle and external eye contour concave; eye bulge small; transition between anterior and ventral margin of rostrum angular ( Fig. 5e View FIGURE 5 ). Antennule reaches to fifth antennary segment. Antenna with middle antennary segment with four spines anteriorly.

Thorax. 22 thorax segments; of these 20 "complete" and two "incomplete" ( Fig. 5f View FIGURE 5 ); dorsal spines beginning at 7th thorax segment, 13 thorax segments with dorsal spines; first dorsal spine same size as following one; last "complete" thorax segment without dorsal spine ( Fig. 5f View FIGURE 5 ).

Telson. 16 telsonic spines, of these three enlarged, telsonic spines end after base of apex; telsonic filaments situated at fourth telsonic spine. Furca with five setae, as long as proximal part of furca ( Fig. 5f View FIGURE 5 ).

Ovigerous flagella situated at 9th and 10th thorax segment.

Variability. Males Carapace. 3.1–5.1 mm high, 4.9–7.8 mm long, height/length ratio 0.63–0.68; height without "crowded" growth lines 2.5–5.1 mm; length without "crowded" growth lines 3.7–7.8 mm; dorso-posterior corner clearly present or nearly absent; 17–26 growth lines, of these 17–24 "non-crowded" and up to seven "crowded"; umbo small or large, cone-shaped or hemispheric, growth lines present or absent.

Head. Eye bulge absent or present, if present small or large, compound eye oval or round; obtuse to straight angle between head and rostrum; anterior margin of rostrum straight or convex, transition between anterior and ventral margin rounded or angular ( Fig. 6a View FIGURE 6 ). Antennule with 15–25 lobules, closely or widely arranged; reaches to 8th –13th antennary segment. Antenna with 12–14 antennary segments, middle antennary segment anteriorly with four to seven spines ( Fig. 6b View FIGURE 6 ).

Thorax. 20–21 thorax segments, of these 18–20 "complete" and one or two "incomplete" ( Fig. 6e View FIGURE 6 ); dorsal spines beginning at 6th –10th thorax segment, 10–15 thorax segments with dorsal spines, last dorsal spine smaller than or same size as preceding one, last "complete" thorax segment with or without dorsal spine ( Fig. 6e View FIGURE 6 ).

Telson. 11–15 telsonic spines, of these up to four enlarged, telsonic spines end before, at or after base of apex; telsonic filaments situated between the second and fifth telsonic spine. Furca with 3–14 setae, setae shorter than, as long as, or longer than proximal part of furca ( Fig. 6e View FIGURE 6 ); small spine before row of spinules present or absent.

Variability. Females. Carapace. 3.2–5.2 mm high, 4.7–8.0 mm long, height/length ratio 0.63–0.68; height without "crowded" growth lines 3.0– 4.8 mm, length without "crowded" growth lines 4.5–7.3 mm; dorso-posterior corner clearly present or nearly absent; 12–24 growth lines, of these 11–21 "non-crowded" and up to seven "crowded"; umbo small or large, growth lines present or absent.

Head. Section between condyle and external eye contour concave or straight; eye bulge absent or present, if present small; acute or straight angle between head and rostrum, transition between anterior and ventral margin of rostrum rounded or angular. Antennule with 15–22 lobules, closely or widely arranged; reaches to 5th –7th antennary segment. Antenna with 11–14 antennary segments, middle antennary segment anteriorly with four to six spines.

Thorax. 20–22 thorax segments, 19–20 "complete" and one or two "incomplete"; dorsal spines beginning at 7th –10th thorax segment, 10–14 thorax segments with dorsal spines; first dorsal spine smaller than or same size as preceding one; last dorsal spine smaller than or same size as following one, last "complete" thorax segment with or without dorsal spine.

Telson. 12–18 telsonic spines, of these up to three enlarged, telsonic spines end before, at or after base of apex; telsonic filaments situated between second and sixth telsonic spine. Furca with two to twelve setae, shorter than or as long as proximal part of furca; small spine before row of spinules present or absent.

Differential diagnosis. Eocyzicus ubiquus   sp. nov. is hard to distinguish from all other Eocyzicus   species because of its large intraspecific variability that overlaps with that of many other species ( Table 1 and 2), especially with E. argillaquus   ( Fig. 2a and c View FIGURE 2 ). It is possible to differentiate these species morphologically by the total number of growth lines and of telsonic spines. Eocyzicus ubiquus   sp. nov. and E. argillaquus   are genetically clearly differentiated and not presumed sister species. Because of their sympatric distribution, they are certainly distinct species following the Biological Species Concept (Mayr, 1942), the Phylogenetic Species Concept sensu Wheeler & Platnick (2000), and the Evolutionary Species Concept (Wiley & Mayden, 2000). Eocyzicus ubiquus   sp. nov. can be morphologically distinguished from its putative sister species E. timmsi   sp. nov. by the number of growth lines and number of lobules on the antennules in females ( Tables 1 and 2).

Distribution and ecology. Eocyzicus ubiquus   sp. nov. is distributed in a variety of water bodies with very different ecological conditions: in small pools as well as lakes, clear and turbid, fresh and hyposaline water bodies. It occurs sympatrically with Eocyzicus richteri   sp. nov., E. phytophilus   sp. nov., E. parvus   sp. nov., E. argillaquus   , E. parooensis   , and E. armatus   sp. nov. and rarely syntopically with the latter species.