Biogeographical and ecological insights from Australasian faunas: the megadiverse collembolan genus, Entomobrya (Entomobryidae) Author Jordana, Rafael Author Greenslade, Penelope text Zootaxa 2020 2020-05-06 4770 1 1 104 journal article 22349 10.11646/zootaxa.4770.1.1 6b7e3a53-0658-4628-bfb6-9f39f0b34c99 1175-5326 3797958 39F2F040-E300-4065-9E8E-83A9D6286D1F Entomobrya boreensis sp. nov. ( Figs 1E , 4C , 10 A–F) Holotype . Female, SA , 90 Mile Desert, Ngarkat Conservation Park, Comet Bore, mallee clay pan, - 35.44°S , 140.48.2°E, 25m asl , pitfall , 5−10.x.1977 , PG leg., [ SAMA 22667 ]. Paratypes . Two females, same collection data as holotype. Other material examined . SAMA , 2 male and 2 female , NSW , Broken Hill , in Mitchell grass, 21.ix.1990 ; 60 km ENE Broken Hill , Glen Idol Station , 10.x.1990 , - 31.8175°S , 141.933056°E , 165m asl , pitfall . FIGURE 10. Entomobrya boreensis sp. nov. Line drawings A–F: A, labral papillae bar=0.02 mm; B, Ant III organ bar=0.02 mm; C, head chaetotaxy bar=0.4 mm; D, Th II chaetotaxy; E, Abd II–III chaetotaxy; F, Abd IV chaetotaxy. Bar C, F=0.125 mm. Open circles mean unstable Mc. Description. Size. Length Up to 1.25 mm excluding antennae, (n=8 from 0.98–1.67 mm ). Colour. Uniform pale orange. Head with an anterior stripe purple. Ant 3 and 4 entirely pigmented. Th II to Abd III with the posterior transversal narrow band and laterals one ( Figs 1E , 4C ). Some scattered pigment can be seen under a microscope. Head. Eight eyes, G and H smaller than E and F. Antennae length 630 μm (n=7), 2.4 times the length of the head (n=7). Ant IV with bilobed apical vesicle with pin chaeta beside it; relative length of Ant I/II/III/IV=1/1.9/2/2.6 (n=7). Sensory organ of Ant III with curved rod-like sensilla in addition to the 3 guard sensilla ( Fig. 10B ); four labral papillae with one short and conical projection each ( Fig. 10A ). Labral formula: 4/554, 4 prelabral ciliated chaetae, labral chaetae smooth. Labial chaetae MEL 1 L 2 all ciliated, only with one Mc M, and without R. External process of labial papilla E reaching the papilla tip. Thorax and abdomen. Length ratio of Abd IV/III=4 (n=8). Tibiotarsus without differentiated chaetae, with exception of the presence of the smooth terminal chaetae on legs 3, characteristic for the genus. Trochanteral organ from 8 to 12 spiny chaetae. Unguis length 40 μm. Unguis with 4 teeth: paired at 50% of the base and first unpaired at 70-75 % from base; lateral teeth below the level of paired ones. Unguiculus lanceolate, with external serrated lamella. Tenent hair clavate, longer than unguis. The length of manubrium and dens 220 + 353=573 μm (n=8). Manubrial plate with 4 chaetae and 2 pseudopores. Mucro bidentate with anteapical tooth similar in size to apical one, and with mucronal basal spine reaching the tip of the subapical tooth. Mucro 11 μm, (n=8). Length of apical smooth part of dens twice length of mucro. TABLE 5. Comparative characters of E. boreensis sp. nov. and morphologically similar species

Head	LP	Th II
species/ characters	An3a1	S4i	Ps2	Ps3	m1	m2	m2i	m2i2	m4	m4i	m4p	m5
E. assuta	1	0	1	1	2	0	0	0	0	0	0	0	0
E. bioblitzi sp. nov.	1	0	0	0	2	1	1	0	0	1	1	0	0
E. clarki	0	0	0	0	2	1	0	0	0	1	1	0	1
E. durrasensis sp. nov.	0	0	1	0	4	1	1	1	1	1	1	1	1
E. stirlingensis sp. nov.	0	1	0	0	4	1	1	0(1)	0	1	1	0	1
E. boreensis sp. nov.	0	0	1	0	3	0	1	0(1)	0	1	1	0	1
bor/ass	*	*	*	*	*	*	*
bor/bio	*	*	*	*	*
bor/cla	*	*	*	*
bor/dur	*	*	*	*
bor/sti	*	*	*	*

TABLE 5. (Continued)

EU	Abd II	Abd IV		Diff
species/ characters	m3	m3ep	A2	A4	A5	B4	B5	C2a	E1
E. assuta	1	1	0	0	0	0	0	1	0	0
E. bioblitzi sp. nov.	0	0	1	1	1	0	1	0	0	1
E. clarki	1	0	1	0	1	1	1	1	0	0
E. durrasensis sp. nov.	1	1	0	0	1	1	1	1	0	0
E. stirlingensis sp. nov.	1	0	1	0	1	1	1	1	0	0
E. boreensis sp. nov.	1	1	0	0	1	1	1	1	1	0
bor/ass	*	*	*	*	11
bor/bio	*	*	*	*	*	*	*	*	13
bor/cla	*	*	*	7
bor/dur	*	5
bor/sti	*	*	*	7

LP=Labral Papilla: Without =0 smooth =1 Multispinate =2 seta like =3 Pointed not seta like =4. External unguiculus=EU: 0=smooth, 1=serrate. Diff = differences. bor / sti meaning the comparison between the species E. boreensis versus E. stirlingensis . The same abbreviations (first three letters) for the remaining species. * means differences. Macrochaetotaxy. Simplified Mc formula: 3,1,0,1(2),2/1(2),4/0,2/0,0,1/0,0,3,2,2. Head chaetotaxy ( Fig. 10C ) An 1 , An 2 , An 3a1 and An 3 Mc. A 5 Mc. M 1 to M 4 present as Mc. In sutural row S 0 , S 1 (sometimes absent), S 3 , S 4 , S 5i and S 5 . Ps 2 and Ps 5 present. Thorax chaetotaxy: Th II chaetotaxy ( Fig. 10D ) with Mc m 2 and m 2i2 (sometimes absent) on T1 area. On T2 area Mc a 5 , m 4 , m 4i and m 5 present (sometimes a 5’ as mesochaeta is present). Abdominal chaetotaxy, a 2 and a 3 absent on A1 area at Abd II, only m 3 and m 3e Mc are present on A2 area of Abd II ( Fig. 10E ). On Abd III only m 3 Mc is present on A5 area, Abd IV ( Fig.10F ) with Mc A 4 –A 6 , B 4 –B 6 and C 2a . Sensillary formula 2,2/1,2,2,7,3, mS= 1,0/1,0,1. Remarks. The new species has the same chaetotaxy on Abd II and Abd III (0,2/0,0,1 Mc) as E. stirlingensis sp. nov. and E. clarki , but differs in the presence of Ps 2 on the head and of 3 Mc on area 8 of Abd IV. The colour differs between these species, and E. boreensis sp. nov. has labral papillae with one short conical projection instead of having a multispinate form as in E. clarki . Other differences are in the absence of labial R chaeta in the new species and the unguis with paired teeth at 32% from base in E. clarki and 50% in E. boreensis . The size also differs, as adults are smaller in E. boreensis than in E. clarki . See Table 5 The distribution of this species is unusual for the genus being found in widespread localities in the arid zone. Etymology. The species name refers to the type locality.