Two new genera and two new species of the mite family Neopygmephoridae (Acari: Heterostigmata) associated with small mammals from USA
Author
Khaustov, Alexander A.
Tyumen State University, Tyumen, Russia.
Author
Whitaker, John O. Jr.
Director Emeritus, Center for Bat Research, Outreach, and Conservation, Department of Biology,
text
Acarologia
2019
2019-08-02
59
3
308
322
http://dx.doi.org/10.24349/acarologia/20194335
journal article
10.24349/acarologia/20194335
2107-7207
5173635
4CC238AE-261B-432A-901D-490635B60695
Genus
Theriadania
gen. nov
Zoobank:
6D0CFA60-B3B1-42F6-8134-DC013C856FF1
Type
species:
Theriadania venusta
sp. nov.
Diagnosis
— Female. Body oval. Gnathosomal capsule distinctly elongate, its length almost two times longer than width, dorsally with one pair of cheliceral setae
cha
(); setae
chb
absent, postpalpal setae not evident; palps prominent, with two pairs of setae
dFe
(,
dGe
), tiny distal seta-like structure and small tibial claw distally. Subcapitulum with one pair of setae
m
and large round alveolar pits
n
; palps ventrally with accessory setigenous structure (
ass
), palpal solenidion not evident. Pharyngeal pumps tripartite, pharyngeal pump 1 very small, vestigial separated from pumps 2 and 3. Prodorsum and tergite C separated by soft cuticle. Prodorsum with two pairs of setae (
v
2
,
sc
2
), pair of clavate trichobothria
sc
(
1
) and elongate 2-chambered stigmata located dorsolaterally and partly covered by lateral projections of prodorsal shield (
Figs 7C
,
11A
). Dorsal hysterosomal setae modified, flat, wide and strongly barbed. Tergite C with two pairs of setae (
c
1
,
c
2
), setae
c
1
located near anterior margin of tergite; tergite D with one pair of setae (
d
) and pair of elongate, rhombic cupules
ia
(
Fig. 11B
); tergite EF with two pairs of setae (
e
,
f
); tergite H with two pairs of setae
h
(
1
,
h
2
) and pair of inverse drop-shaped cupules
ih
. Coxal fields I with two pairs of setae (1
a
, 1
b
); coxal fields II with two pairs of setae (2
a
, 2
b
); coxal fields III with three pairs of setae (3
a
, 3
b
, 3
c
); coxal fields IV with three pairs of setae (4
a
, 4
b
, 4
c
). Pseudanal segment with three pairs of setae
ps
(
1-3
). Ap1 and ap2
Figure 3
Crossdania tubulosa
sp. nov.
, female: A – left leg I in dorsal view, B – left leg II in dorsal view.
well developed and joined with appr, apsej well developed and joined with appr; ap3 weak, diffuse, ap4 long, reaching beyond bases of setae
b
. 3 Ap5 short, located near the bases of trochanters IV. Secondary transverse apodeme absent. Coxal fields I separated from coxal fields II by u-shaped line. Posterior margin of posterior sternal plate entire, slightly convex in middle part. Anterior genital sclerite (ags) small, bell-shaped, posterior genital sclerite (pgs) small, triangular. Median genital sclerite absent. Ventral idiosomal setae thick and flat. Legs
I distinctly shorter than legs II. Tibiotarsus I cylindrical, with simple hooked claw situated on short pretarsus; seta
d
of femur I wide and flat, fan-shaped (
Fig. 11C
), seta
k
short, lanceolate, eupathidium-like. Solenidion
ω
2
absent. Claws on tarsi II and III simple, hooked. Claws on pretarsus IV simple, slightly curved. Femora III–IV divided into basi- and telofemur. Setae
d
of tibia,
pl”
,
tc’
, and (
pv
) of tarsus of leg II, and
pv’
of tarsus III modified, thickened and usually with “crown” of hooked barbs. Empodia on tarsi II and III tongue-shaped; empodium on tarsus IV very long and narrow. An unpaired simple seta
u
() located near the base of pretarsal claw. Leg setation: leg I; Tr 1
v’
(), Fe 3 (
d
,
l’
,
v”
), Ge 4 (
l’
,
l”
,
v’
,
v”
), TiTa 17(3) (
d
,
l’
,
l”
,
v’
,
v”
,
k
,
tc’
,
tc”
,
p”
,
ft’
,
ft”
,
pv’
,
pv”
,
pl’
,
pl”
,
s
,
u
,
ω
1
,
φ
1
,
φ
2
); leg II: Tr 1 (
v’
), fe 3 (
d, l’
,
v”
), Ge 3 (
l’
,
l”
,
v’
), Ti 4(1) (
d
,
l’
,
v’
,
v”
,
φ
), Ta 6(1) (
tc’
,
tc”
,
pl”
,
pv’
,
pv”
,
u’
,
ω
); leg III: Tr 1 (
v’
), Fe 2 (
d
,
v’
), Ge 2 (
l’
,
v’
), Ti 4(1) (
d
,
l’
,
v’
,
v”
,
φ
), Ta 6 (
tc’
,
tc”
,
pl”
,
pv’
,
pv”
,
u’
); leg IV: Tr 1 (
v’
), F 2
Figure 4
Crossdania tubulosa
sp. nov.
, female: A – left leg III in dorsal view, B – left leg IV in dorsal view.
(
d
,
v’
), Ge 1 (
v’
), Ti 4(1) (
d
,
l’
,
v’
,
v”
,
φ
), Ta 6 (
tc’
,
tc”
,
pl”
,
u’
,
pv’
,
pv”
).
Differential diagnosis
— The new genus is most similar to
Crossdania
gen. nov.
by the presence of modified setae on leg II and very long empodium on tarsus IV. The new genus differs from
Crossdania
gen. nov.
by the presence of claws on tarsus IV (vs absent in
Crossdania
), by the fan-shaped seta
d
of femur I (vs. hook-like in
Crossdania
), by the absence of solenidion
ω
2
(vs. present in
Crossdania
), and by unusual elongate 2-chambered stigmata (vs. round, 1-chambered in
Crossdania
).
Species included
— The genus
Theriadania
includes only one species
Theriadania venusta
sp. nov.
Distribution and habitats
—
Theriadania venusta
sp. nov.
was collected on Merriam’s
Figure 5
DIC micrographs (AxioCam 506 color) of
Crossdania tubulosa
sp. nov.
, female: A – prodorsum, B – tergites D and EF, C – tube-like structures (arrowed) under tergite H, D – prosoma in ventral view, E – posterior sternal plate, F – leg II in dorsal view.
Figure 6
Theriadania venusta
sp. nov.
, female: A – dorsum of the body, B – venter of the body. Legs omitted.
kangaroo rat,
Dipodomys merriami
(
Rodentia
:
Heteromyidae
) in
USA
.
Etymology
— The generic name is a combination of two words: Ancient Greek
θηρΊΟΝ
(theria) meaning, wild beast and
dania
, the common ending of many Neopygmephorid genera and refers to association of mites with small mammals.