Eocyzicus phytophilus,

Tippelt, Lisa & Schwentner, Martin, 2018, Taxonomic assessment of Australian Eocyzicus species (Crustacea: Branchiopoda: Spinicaudata), Zootaxa 4410 (3), pp. 401-452: 427-430

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-FFED-9128-A180-FE1DC504FC5B

treatment provided by

Plazi

scientific name

Eocyzicus phytophilus
status

sp. nov.

Eocyzicus phytophilus  sp. nov.

( Figs. 13View FIGURE 13 and 14View FIGURE 14)

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

Etymology. The species name is derived from Ancient Greek and translates as "prefer plants" which relates to its occurrence in well vegetated water bodies.

Type locality. Queensland, Bulloo River catchment, swamp near Thargomindah Station , 28°03´12.5´´S, 143°47´11.5´´E.GoogleMaps 

Type material. Holotype. Male (AM P.89579, GenBank KC583943).

Allotype. Female (AM P.89581, GenBank KC583945).

Paratypes. 3 males (AM P.89580, GenBank KC583944; AM P.89582, GenBank KC583946; AM P.89583, GenBank KC583947), 1 female (AM P.89584, GenBank KC583948), collected by M. Schwentner, S. Richter and B. V. Timms, 26-II-2011.

Further material examined. New South Wales: 3 males (AM P.89568, AM P.89571, AM P.89572)  , 3 females (AM P.89569, AM P.89570, AM P.89573) Grassy pool north of Yantabulla , 29°19´04.8´´S, 145°00´31.5´´E, 20-I- 2010GoogleMaps  ; 1 female (AM P.89564) Beverly's Pool, Bloodwood Station , 29°32´12.0´´S, 144°51´16.1´´E, 19-II-2010GoogleMaps  ; 1 female (AM P.89566) Small lake on east boundary, north site of road, Muella Station , 29°31´38.5´´S, 145°00´43.7´´E, 20-II-2010GoogleMaps  ; 1 female (AM P.89565) Small lake on east boundary, south site of road, Muella Station , 29°31´54.1´´S, 145°01´02.4´´E, 20-II-2010GoogleMaps  ; South Australia: 1 male (AM P.89574)  , 1 female (AM P.89575) Old small dug out 105 km east of Marla , 27°10´00.2´´S, 134°33´07.2´´E, 11-III-2011GoogleMaps  ; 1 female (AM P.89577) Vegetated clear water swamp 43 km west of Oodnadatta , 27°20´38.9´´S, 135°08´40.3´´E, 11-III-2011GoogleMaps  .

Description. Holotype male ( Fig. 13a, c and dView FIGURE 13). Carapace. 2.9 mm high, 4.7 mm long, height/length ratio 0.62; height without "crowded" growth lines 2.7 mm, length without "crowded" growth lines 4.5 mm; shape oval; dorso-posterior corner clearly present; twelve growth lines, of these eleven "non-crowded" and one "crowded"; umbo small, hemispheric, growth lines absent ( Fig. 13aView FIGURE 13).

Head. Condyle rounded, section between condyle and external eye contour concave; eye bulge small, compound eye oval; obtuse angle between head and rostrum, anterior margin of rostrum convex; transition between anterior and ventral margin angular ( Fig. 13cView FIGURE 13). Antennule with 23 lobules, widely arranged; reaches to 11th antennary segment. Antenna with twelve antennary segments, middle antennary segment anteriorly with four spines.

Thorax. 21 thorax segments, of these 19 "complete" and two "incomplete" ( Fig. 13dView FIGURE 13); dorsal spines beginning at 7th thorax segment, 13 thorax segments with dorsal spines; one dorsal spine at each thorax segment, first dorsal spine same size as following one, last dorsal spine smaller than preceding one, last "complete" thorax segment with dorsal spine ( Fig. 13dView FIGURE 13).

Telson. 13 telsonic spines, of these three enlarged, telsonic spines end after base of apex; telson symmetric; telsonic filaments situated at fourth telsonic spine. Furca with ten setae, longer than proximal part of furca; small spine before row of spinules present, spinules short ( Fig. 13dView FIGURE 13).

Allotype female ( Fig. 13b, e and fView FIGURE 13). Carapace. 4.8 mm long, height/length ratio 0.6; height without "crowded" growth lines 2.5 mm; length without "crowded" growth lines 4.1 mm; 13 growth lines, of these eleven "noncrowded" and two "crowded" ( Fig. 13bView FIGURE 13).

Head. Section between condyle and external eye contour straight; eye bulge absent, compound eye round ( Fig. 13eView FIGURE 13). Antennule with 16 lobules, closely arranged; reaches to fifth antennary segment. Antenna with eleven antennary segments, middle antennary segment anteriorly with five spines.

Thorax. Twelve thorax segments with dorsal spines; last dorsal spine larger than preceding one; last "complete" thorax segment without dorsal spine ( Fig. 13fView FIGURE 13).

Telson. 17 telsonic spines, of these two enlarged; telsonic filaments situated between third and fourth telsonic spine. Furca with three setae, shorter than proximal part of furca ( Fig. 13fView FIGURE 13).

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

Variability. Males. Carapace. 2.7–4.0 mm high, 4.5–6.4 mm long, height/length ratio 0.59–0.65; height without "crowded" growth lines 2.6–3.7 mm; length without "crowded" growth lines 4.3–6.3 mm; dorso-posterior corner clearly present or nearly absent; 12–20 growth lines, of these 11–18 "non-crowded" and up to five "crowded"; umbo small or large, hemispheric, growth lines present or absent.

Head. Section between condyle and external eye contour concave or straight; eye bulge absent or present, if present small or large, compound eye oval or round; acute or obtuse angle between head and rostrum ( Fig. 14aView FIGURE 14). Antennule with 16–23 lobules, closely or widely arranged; reaches to 8th –12th antennary segment ( Fig. 14bView FIGURE 14). Antenna with 11–13 antennary segments, middle antennary segment anteriorly with three to six spines.

Thorax. 19–22 thorax segments, of these 19–21 "complete" and up to two "incomplete" ( Fig. 14eView FIGURE 14); dorsal spines beginning at 5th –8th thorax segment, 13–16 thorax segments with dorsal spines; first dorsal spine smaller than, same size as or larger than following one, last dorsal spine smaller than or same size as preceding one, last "complete" thorax segment with or without dorsal spine ( Fig. 14eView FIGURE 14).

Telson. 13–21 telsonic spines, of these one to four enlarged, telsonic spines end before, at or after base of apex; telsonic filaments situated between second and fifth telsonic spine. Furca with 4–14 setae, as long as or longer than proximal part of furca ( Fig. 14eView FIGURE 14).

Variability. Females. Carapace. 2.9–4.5 mm high, 4.7–6.9 mm long, height/length ratio 0.6–0.65; height without "crowded" growth lines 2.5–4.1 mm, length without "crowded" growth lines 4.1–6.5 mm; dorso-posterior corner clearly present or nearly absent; 13–20 growth lines, of these 11–17 "non-crowded" and up to nine 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 or large, compound eye oval or round; acute to obtuse angle between head and rostrum, anterior margin of rostrum concave, straight or convex, transition between anterior and ventral margin rounded or angular. Antennule with 12–18 lobules; closely or widely arranged; reaches to 4th –7th antennary segment. Antenna with 10– 13 antennary segments, middle antennary segment anteriorly with four to six spines.

Thorax. 20–22 thorax segments, of these 19–21 "complete" and one or two "incomplete"; dorsal spines beginning at 7th –11th thorax segment, 10–14 thorax segments with dorsal spines; first dorsal spine smaller than or same size as following one; last dorsal spine smaller, same size or larger than preceding one, last "complete" thorax segment with or without dorsal spine.

Telson. 17–22 telsonic spines; of these one to five enlarged, telsonic spines end at or after base of apex; telsonic filaments situated between third and fifth telsonic spine. Furca with three to twelve setae, shorter than, as long as or longer than proximal part of furca.

Differential diagnosis. Eocyzicus phytophilus  sp. nov. and its putative sister species E. parvus  sp. nov. are morphologically – for example by the total number of growth lines – as well as genetically clearly differentiated ( Tables 1 and 2; Schwentner et al., 2014). Therefore, E. phytophilus  sp. nov. can be delimitated as a species following the PSC sensu Wheeler & Platnick (2000), ESC (Wiley & Mayden, 2000) and BSC (Mayr, 1942). Morphologically E. phytophilus  sp. nov. resembles most closely Eocyzicus ubiquus  sp. nov. They can be distinguished by the length of spinules (long in Eocyzicus ubiquus  sp. nov. and short in E. phytophilus  sp. nov.), the total number of growth lines on the carapace and the number of telsonic spines ( Tables 1 and 2).

Distribution and ecology. This species occurs in vegetated fresh, clear and turbid water bodies and shows a sympatric distribution with E. ubiquus  sp. nov., E. richteri  sp. nov., Eocyzicus parvus  sp. nov., E. armatus  sp. nov., E. parooensis  and E. argillaquus  and rarely occurs syntopically with the latter.

BSC

Centro Oriental de Ecosistemas y Biodiversidad