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 assuta Folsom, 1924 sensu Katz et al., 2015 ( Figs 1C , 8 A–G) Type locality.: Vermont, New York , North America . Material examined . Two females , WA , Barrow Island , on wharf during quarantine inspection, on imported timber , - 20.78778°S , 115.3991°E , 3m asl, 27.vi.2011 , [ SAMA ] . Several specimens , Barrow Island , beside plant construction, airport and new village, in Triodia vegetation , pitfalls and Winkler extraction , N. Gunawardene leg., all collections previously determined as E. marginata ( PG ) . Redescription based on Australian material. Size. 2 mm female adult, 1.5 mm female sub-adult. Body shape. Dorso-ventrally flattened. Colour. Dorsal colour pattern dark blue with darkened band on the hind part of each tergite ( Fig 1C ). Head. Apical bulb of antennal segment IV bilobed, long differentiated smooth chaetae on the ventral side of antennal segment 1–4–plus short chaetae. Prelabral chaetae clearly ciliated. Distal margin of each labral papillae with 2–3 small spine–like projections. Eyes G and H small and subequal Eyepatch with five chaetae. FIGURE 8. Entomobrya assuta . Line drawings A–G: A, tip of leg 3 (bar=0.025 mm); B, head chaetotaxy (bar 0.4 mm); C, Th II chaetotaxy; D, Abd I chaetotaxy; E, Abd II chaetotaxy; F, Abd III chaetotaxy; G, Abd IV chaetotaxy. Bar C–G=0.125 mm. Thorax and abdomen. Thoracic chaetotaxy extremely reduced. A row of microchaetae present along the entire posterior margin of Th II and Th III (not displayed in figures). Trochanteral organ with triangular chaetae pattern and up to 11 chaetae. Unguis with 4 inner teeth; paired teeth located approximately in the middle of inner unguis length. Dorsal tooth intermediate, 2 lateral basal teeth. Two unpaired teeth on the internal edge of the unguis, unguiculus serrate on external edge ( Fig. 8A ). Chaetotaxy. Dorsal head chaetotaxy at figure 8B; Mc A 6 , M 3 , S’ 0 , S 0 , S 1 , S 4i , always absent; M 1 , M 2 and M 4 present; Ps 2 and Ps 5 present. Th II, with a 5 Mc ( Fig. 8C ) Th III, with 7 Mc: a 5 , a 6 , m 5 , m 6 , m 7 , p 4 , and p 6 ; Mc a 1 , a 2 , and a 3 absent. Chaetotaxy of zone Pm extremely reduced for both thoracic segments, without Mc. Abdominal chaetotaxy reduced.Abd I with 3 Mc m 2 , m 4 , and m 6 ( Fig. 8D ); a row of mic along entire posterior margin present (not displayed in the figure). Abd II with 3 Mc: m 3 , m 3e , and m 5 ( Fig. 8E ). Abd III with 3 Mc: m 3 , pm 6 , and p 6 . ( Fig. 8F ). Abd IV with 3 inner Mc B 5 , B 6 and A 6 ( Fig. 8G ). Manubrial plate with 2 chaetae and 2 pseudopores. Mucronal teeth subequal. TABLE 3. List of intensively collected localities and numbers of Entomobrya species collected from each. Species occurrence on vegetation type

Montane heath and grassland	Tropical/subtropical rain forest	Native and/or exotic lowland grassland
bioblitzi	additae	darelis
caputovisensis	imbre	mauretanica
charlotteensis	kitchingi	multifasciata
promontorium	peregrina	restituta
regina	termitophila	militum
stirlingensis	tasmomarginata
weldensis
7	5	6

TABLE 3. (Continued)

Species occurrence on vegetation type
Arid and/or semi-arid zones	Lowland Eucalyptus forest	Urban/disturbed
boreensis	clarki	grisacea
Himalanura draconis	driesseni	herberti
durrasensis	lamingtonensis
herbacea (vegetation)	nigrocincta
karta	unostrigata
loftyensis
ludimus
niger
potterae
pseudomarginata
torquemensa
virgata
zebra
3	13	5

Remarks. Entomobrya assuta from Barrow Island has a macrochaetal formula of 4,1,0,1,2/0,1/0,2/0,0,1/0,0,0, 1,2 which unique for an Entomobrya species. The Barrow Island specimens are similar in most aspects to Entomobrya assuta from the North America whose formula is 4(5),1,0,1,2/0,1/0,2/0,1,1/0,0,1,1,2 see Katz et al. (2015) . The colour pattern is different, but some specimens of E. assuta , described by Katz are a uniform blue. The remaining morphological characters are similar to North American E. assuta , except the number of chaetae in the trochanteral organ. Of 44 characters, only 2 are different: a 2 as microchaetae on Abd II and C 1 on Abd IV present in E. assuta and absent in the Australian specimens. All other characters are identical. Specimens from both regions have the most reduced chaetotaxy of any Entomobrya . This is the first exotic species to be recorded from Barrow Island and was introduced to the Class A nature reserve during construction of the gas processing plant on the island by the Chevron Mining Company. This was despite stringent quarantine control on imports and fumigation of all imported timber. It is an example of the occasional ineffectiveness of fumigation in killing adventitious specimens. The timber was imported for scaffolding but its country of origin is unknown.