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 additae
sp. nov.
(
Figs 1A
,
4A
,
7
A–H)
Holotype
.
Female
on slide, 16–1,
QLD
,
Lambs Head
,
10 km
W of Edmonton
, 2
nd
tower, -
17.023°S
,
145.641°E
,
1320m
asl
, pyrethrum spray, logs and trees,
11.xii.1989
,
G. Monteith
,
G. Thompson
&
H. Janetzki
leg., [
QLD
Mus 16-1].
Paratypes
. Five females. Same collection details as
holotype
but on mossy rock, various dates 1988,
10.xii.1989
, [QLDMus 16–1, 16–2, 15–1, 15–2, 22–2].
Other material examined
. QLDMus,
QLD
,
Mt Lewis Rd.
16 km
from
Highway
, -
16.571°S
,
145.260°E
,
900m
asl
,
Dec 1989
to
Jan. 1990
,
G. Monteith
&
G. Thompson
leg
;
QLD
,
Pauls Luck
,
Platypus Creek
,
13 km
W. Mossman
, -
16.447°S
,
145.257°E
,
1135m
asl
, moss,
Jan. 1990
and
17.x.1981
,
G. Monteith
&
Janetzki
leg
;
QLD
,
4 km
S. of
Koombooloomba Dam
, -
17.864°S
,
145.867°E
,
800m
asl
, rain forest,
pitfalls
,
Dec 1989
to
Jan 1990
,
G. Monteith
,
G. Thompson
&
H. Janetzki
leg
;
QLD
,
O’Reilly’s
,
Dec 1988
, -
30.497°S
,
153.138°E
,
935m
asl
PG leg
.;
SAMA
,
NSW
,
Styx River
,
Nothofagus
forest, canopy fogging, various dates in 1990, 1991, -
30.497°S
,
152.396°E
,
1390m
asl
;
3 specimens
with truncate unguiculus, specimens 2, 3 and 4
,
QLD
,
Lamington
NP,
Oct. 2006
, -
30.497°S
,
153.138°E
,
935 m
asl
,
pitfall
,
Kitching
leg.
[QLDMus 15–1, QLDMus 15–2, QLDMus 17, QLDMus 22–2].
Description.
Size. Length
2.141 mm
(n=7)
FIGURE 7
.
Entomobrya additae
sp. nov.
Line drawings A–H. A, leg 1 (bar=0.05 mm); B, leg 3 (bar=0.05 mm);; C, tip of dens and mucro (bar=0.014 mm); D, head chaetotaxy (bar 0.38 mm); E, Th II chaetotaxy; F, Abd II chaetotaxy; G, Abd III chaetotaxy; H, Abd IV chaetotaxy. Bar E–H=0.125 mm.
Colour. Dorsally whitish yellowish with some dark blue bands in anterior and lateral parts of Th II (sometimes with a posterior band), Lateral bands on Th III, Abd I and Abd II, Abd III with lateral longitudinal stripes and a posterior band with or without a posterior triangular central spot, Abd IV with lateral, transverse irregular bands and a narrow stripe on posterior edge. Abd V and VI with lateral spots (
Figs 1A
,
4A
). Body some specimens very similar in colour to
E. varia
.
Head. The apical bulb of antennal segment IV bilobed. The labral papillae spinulate with one or two spines. Prelabral and labral chaetae 4/554. Prelabral chaetae clearly ciliated, labral chaetae smooth. Labial chaetae with MREL
1
L
2
Ciliated chaetae, R smaller than M. External labial process of papilla E reaching at the papilla end. Eyes G and H small and subequal. Ant / head=2.55 (n=7). Ratio Ant I:II:III:IV=1:2.3:2.0:2.43.
Thorax and abdomen. Trochanteral organ with 17–20 smooth and spiniform chaetae. Unguis (
Figs 7
A–B) with 4 inner teeth; paired teeth located approximately 29% (n=12) of inner unguis length, dorsal tooth basal. Two clear unpaired teeth on the internal edge of the unguis, first one at 66% on unguis 1 and 2, 75% of the basis of unguis 3, unguiculus long in leg 3 and shorter in leg 1, on both legs truncate and with a smooth external edge. Tenent hair expanded distally and longer than the unguis. Manubrial plate with 4 chaetae and 2 pseudopores. Mucro normal.
Not
ringed part of dens 2 times the mucro.
Chaetotaxy. Dorsal head chaetotaxy at figure 7D; Mc An’
0
, A
6
, A
7
, S’
0
, S
1
, always absent, S
0
, S
2
, S
4i
, S
4
and S
5
present (S
4i
present or absent); M
2
and M
4
present; Ps
2
absent, Ps
5
always present. Thoracic chaetotaxy with one Mc (m
1
) on T1 area on Th II, T2 area with Mc a
5
and m
4
(
Fig. 7E
). Abdominal chaetotaxy reduced.Abd II with a
2
present only in three specimens from 11, Mc a
3
absent, m
3
and m
3e
Mc present Abd III with m
3
(
Fig. 7G
). Abd IV with 12 central and posterior Mc A
3
, A
5
–A
6
, B
5
–B
6
and E
1
(
Fig. 7H
). Mucro with
16 µ
(n=7) as
Figure 7C
. The chaetotaxy formula: 3,1,0,2(1),1a/1,2/0(1),2/0,0,1/0,2,0,2,2. Trichobothria on Abd IV at T2 and T6 location (0101).
Measurements: Ant I–IV 117, 264, 233, and
272 µm
respectively. Abd IV/III=4 (n=7).
Remarks.
A number of specimens incorrectly labelled as
Entomobrya varia
from different localities were similar in chaetotaxy and were found to be this new species. The new species is common in high altitude locations in northeast
Queensland
with some material from
Nothofagus
rainforest at Styx River in northern NSW. Its colour is similar to that of
Type
II
E. varia
Schött, 1917
but it has a truncate unguiculus on all legs, which separates it from
Entomobrya varia
. It is also similar to
E. peregrina
sp. nov.
in that they both have a simplified chaetotaxic formula in some respects. The following Table separates the three species by 12 characters as well as by the colour difference.
Leg |
Head |
Abd II |
Abd IV |
Species/ character |
Unguiculus |
Pair unguis teeth |
S4 |
LP |
a2 |
a3 |
m3e |
m3ea |
A3 |
A4 |
B3 |
E1 |
E. additae
|
Tru, sm |
29% (n=12) |
1 (0) 50% mult |
0=70% |
0 |
0 |
1 |
1 |
0 |
0 |
1 |
sp. nov.
|
each |
(1)=30% |
E. peregrina
|
Acu, se |
29% (n=7) |
1 |
tria |
1 |
0 |
1 |
0 |
1 |
0 |
1 |
0 |
sp. nov.
|
E. varia
|
Acu, sm |
40% (n=23) |
1 |
mult |
1 |
1 |
1 |
0 |
0 |
1 |
0 |
1 |
1=presence; 0= absence; Acu = acuminate; LP=labral papilla; mult = multispinate, tria = triangular; se = serrate; sm = smooth; Tru = truncate; A=
E. additae
; P=
E. peregrina
, V=
E. varia
. Differences A/P=8; A/V=8 Characters; P/V=9 Characters
Very few
Entomobrya
have the truncate unguiculus, a character that is usually associated with halophilic habits.
Etymology.
The species name signifies yet another new species in the genus.