Mites of the genus Gaeolaelaps (Acari: Laelapidae) from southern Brazil, with description of two new species
Author
Marticorena, Jorge L. M.
Author
Moreira, Grazielle Furtado
Promip Manejo Integrado de Pragas, Engenheiro Coelho, São Paulo, Brazil. Email: grabiologia @ yahoo. com. br
Author
Moraes, Gilberto José De
CNPq researcher; Departamento de Entomologia e Acarologia, ESALQ-USP, Piracicaba-SP, Brazil. Email: moraesg @ usp. br
text
Zootaxa
2020
2020-05-08
4772
2
333
348
journal article
22302
10.11646/zootaxa.4772.2.5
4c9b341f-ea31-4d24-b845-e9b0a8d82439
1175-5326
3816536
95C82301-9E6D-4854-8B1B-BDA96720A372
Gaeolaelaps circularis
Hyatt
(
Figures 34
–46)
Gaeolaelaps circularis
Hyatt, 1964: 470
.
Hypoaspis
(
Geolaelaps
)
circularis
.—
Karg, 1979: 84
,
1982: 242
,
1989: 116
.
Gaeolaelaps circularis
.—
Beaulieu, 2009: 36
;
Kazemi
et al
., 2014: 505
.
Diagnosis (female).
Dorsal shield suboval, laterally reticulate, more extensively behind
Z
1, smooth elsewhere, with a slender and rugose strip along margin; with 33 pairs of smooth and pointed setae; setae
J
2,
Px
2
–Px
3,
z
6,
Z
2 and
S
2 absent; pores
gd
1,
gd
2 and
gd
6 absent. Sternal shield reticulate over most of its extent, smooth posteromesally; with long projection between coxae I–II; posterior margin convex. Genital shield drop-like, reticulate. Anal shield piriform. Opisthogaster with 7–9 pairs of simple setae (
Jv
1–
Jv
5,
Zv
1and
Zv
2 always present;
Zv
3 and
Zv
4 present or absent) and five pairs of lyrifissures. Peritreme reaching mid-level of coxa I (level of
s
2), totally ventral. Epistome convex, covered with short, broken, irregularly oriented lines; anterior margin denticulate. Deutosternum with six transverse denticulate lines, each with 12–19 denticles; with three smooth transverse lines laterad of deutosternal groove. Fixed and movable cheliceral digits with eight and two teeth.
Adult female.
(n= 6)
Dorsal idiosoma (
Fig. 34
).
Dorsal shield suboval, laterally reticulate, more extensively behind
Z
1, smooth elsewhere, with a slender and rugose strip along margin; 489 (485–495) long and 301 (290–314) wide; with 33 pair
FIGURES 34–42.
Gaeolaelaps circularis
n.sp.
Female: 34, dorsal view of idiosoma; 35, ventral view of idiosoma; 36, epistome; 37, gnathosoma; 38, anti-axial view of chelicera; 39, labrum; 40, pedipalp; 41, spermathecal apparatus.
of setae:
j
1–
j
6,
z
1–
z
5,
s
1–
s
6,
r
2–
r
5,
J
1,
J
3–
J
5,
Z
1,
Z
3–
Z
5,
S
1,
S
3–
S
5; all setae smooth and pointed; setae
z
6,
J
2,
Px
2
–Px
3,
Z
2 and
S
2 absent; with 15 pairs of lyrifissures and three pairs of pores (
gd
1,
gd
2 and
gd
6 absent). Unsclerotised cuticle laterad of dorsal shield with one or two pairs of setae (
R
1
and
R
5
; the latter often absent). Setal lengths:
j
1 28 (27–28),
j
2 41,
j
3 52 (49–55),
j
4 53 (47–56),
j
5 39 (37–40),
j
6 31 (30–32),
z
1 15 (15–16),
z
2 50 (50–51),
z
3 52 (52–53),
z
4 56,
z
5 35 (33–38),
s
1 33
(31–34),
s
2 33
(31–35),
s
3 52
(52–53),
s
4 56
(55–57),
s
5 50
(50–51),
s
6 39
(37–41),
r
2 37 (36–38),
r
3 42 (41–43),
r
4 30 (30–31),
r
5 30;
J
1 27 (26–28),
J
3 23 (22–25),
J
4 20 (20–21),
J
5 20 (20–21),
Z
1 48 (46–50),
Z
3 41 (40–42),
Z
4 41 (40–41),
Z
5 42 (41–42),
S
1 25
(25–26),
S
3 31
(30–33),
S
4 27
(27–28),
S
5 31
(30–32),
R
1
20 (18–21),
R
5
23 (21–24).
Ventral idiosoma (
Fig 35
).
Base of tritosternum 21 (18–23) long and 11 (10–12) wide basally; laciniae 72 (70– 73), separated for about 95% of their total length. With a pair of reticulate presternal platelets fused to each other by a narrow bridge. Sternal shield reticulate over most of its extent, smooth posteromesally; with long projection between coxae I–II; with three pairs of setae (
st
1–
st
3) and two pairs of lyrifissures (
iv
1,
iv
2); posterior margin convex; length 134 (130–145), width 111 (105–116). Distance between setae:
st
1–
st
1 61 (60–62),
st
2–
st
2 87 (85–90),
st
3–
st
3 88 (87–90). Seta
st
4 and lyrifissures
iv3
on unsclerotised cuticle. Anterior region of endopodal plate fused with sternal shield; region behind sternal shield represented by a triradiate arched platelet, with sharp projection anteriorly (that in some specimens seem fused by a narrow bridge with sternal shield) and laterally, an with an elongate and blunt posterior projection. Exopodal plate fragmented, subtriangular between coxae II–III, elongate and arched near coxae III and IV, the latter with short and sharp anterior and lateral projections, and elongate and blunt posterior projection. Genital shield drop-like, bulging considerably behind
st
5; reticulate, 157 (155–160) long, 105 (103–110) of maximal width; distance
st
5–
st
5 73 (68–80). Genital lyrifissures (
iv
5) on unsclerotised cuticle, posterolaterad of
st
5. With a pair of elongate metapodal platelets. Anal shield piriforn, with a single line parallel to margin and a pair of marginal pores about in level with anterior margin of anal opening; cribrum with 2–3 rows of spines; glands
gv3
indistinguishable. Opisthogaster with 7–9 pairs of simple setae (
Jv
1–
Jv
5,
Zv
1 and
Zv
2 always present;
Zv
3 and
Zv
4 present or absent) and five pairs of lyrifissures. Setal lengths:
st
1 43 (41–46),
st
2 50,
st
3 46 (45–47),
st
4 36 (35–39),
st
5 36 (35–37),
Jv
1 39 (38–40),
Jv
2 38 (36–39),
Jv
3 34 (32–36),
Jv
4 21 (20–21),
Jv
5 38 (35–40),
Zv
1 22 (21–23),
Zv
2 33 (32–35),
Zv
3 20, para-anal 36 (35–37), postanal 21 (18–22). All setae smooth and pointed.
Peritreme and peritrematic plate (
Figs 34, 35
).
Peritreme 236 (230–242) long, extending anteriorly to midlevel of coxa I (level of
z
2), totally ventral; peritrematic plate fused with dorsal shield near
z
1, with a lyrifissure (anterior) and a pore between coxae II–III of each side and a pair of lyrifissures and a pore behind each stigma.
Gnathosoma (
Figs 37–40
).
Anterior region of epistome convex; anterior margin denticulate, covered with short, broken, irregularly oriented lines. Chelicera with distinct dorsal lyrifissure, antiaxial lyrifissure and large dorsal seta and; fixed digit 51 (50–53) long, with 8–9 teeth (most basal and fourth most distal denticles distinctly larger than others) and a thick
pilus dentilis
; with a distinct triangular notch on the paraxial surface matching the tip of the movable digit; movable digit 61 (59–62) with two teeth. Labrum extending forward well beyond tip of corniculus, by a distance about half as long as the latter. Deutosternal groove with six denticulate rows, each with 10–20 denticles; with three pairs of smooth, transverse lines laterad of deutosternal groove. Corniculi parallel to each other, 36 (35–37) long and 14 (12–16) wide, reaching base of palp femur;
h
3 slightly anteromediad of
h
2. Internal malae subtriangular, fimbriate, sided by pair of shorter fimbriate structures. Setal lengths:
h
1 39 (36–42),
h
2 32 (31–33),
h
3 51 (48–53),
pc
36 (34–39). Palp 161 (160–165) long; with usual numbers of setae for
Mesostigmata (
Evans, 1964
)
;
al
1 of genu 13 (12–15) stout, bacillate;
al
2 of genu 24 (22 –25) and
al
1 of femur 26 (26 –27), spine-like. Palp-tarsal claw with two tines of distinct length.
Spermathecal apparatus (
Fig. 41
).
Tubulus slender, about
1 µ
in diameter; rami distinct, with a constriction near attachment with sacculus, about
34 µ
away from each other at attachment to sacculus.
Legs (
Fig. 42–45
).
Lengths (not including ambulacra): I, 452 (440–466); II, 394 (390–397); III, 360 (355–365); IV, 524 (518–535). Chaetotaxy (coxa–tibia): I, 0 0/2 0/0 0; 1 0/1 1/2 1; 2 2/1 3/3 2; 2 3/2 3/1 2; 2 3/2 3/1 2; II -0/1 0/1 0; 1 0/1 0/2 1; 2 3/1 2/2 1; 2 3/1 2/1 2; 2 2/1 2/1 2; III 0 0/1 0/1 0; 1 1/1 0/1 1; 1 2/1 1/0 1; 2 2/1 2/1 1; 2 1/1 2/1 1; IV 0 0/1 0/0 0; 1 1/1 0/1 1; 1 2/1 1/0 1; 2 2/1 3/0 1; 2 1/1 3/1 2; tarsi II–IV with 18 setae each. Seta
pd2
of tarsus IV 91 (85–93) and
ad1
femur IV 72 (70–75) longer (at least 1.2) than other setae of the same segments. With the following setae stouter than other setae of same segments: leg II:
av
of femur and genu;
av
and
pv
of tibia;
mv
,
ad
2,
al
2,
md
,
al
1,
pl
1,
av
1 and
pv
1 of tarsus; leg III:
av
and
pv
of genu and tibia;
mv
,
ad
2,
al
2,
md
,
av
2,
pv
2,
al
1,
pl
1,
av
1 and
pv
1 of tarsus; leg IV:
ad
of trochanter,
pv
of genu;
av
and
pv
of tibia;
av
2,
pv
2,
md
,
al
1,
pl
1,
av
1 and
pv
1.
Adult male.
unknown.
FIGURES 42–45
.
Gaeolaelaps circularis
. Female: 42, leg I; 43, leg II; 44, leg III; 45, leg IV.
Specimens examined.
Four females collected at Valparaíso on
12/II/2014
from soil (
0–5 cm
deep) of natural vegetation; two females collected at Ipaussu on
28/I/2015
from soil (
0–5 cm
deep) of natural vegetation.
Remarks.
This species was only known from the original description, based on the
holotype
, taken from a passalid beetle collected in
Venezuela
. The original description is rather detailed, with good illustrations of the idiosoma, gnathosoma and tarsi II and IV, although bringing only the measurements of the dorsal shield. This species seems most similar to
Gaeolaelaps disjunctus
(
Hunter & Yeh, 1969
)
, which differs by having 32 pairs of dorsal shield setae (apparently missing z2).
Gaeolaelaps aculeifer
(
Canestrini, 1884
)
can be readily distinguished by hav- ing a much larger number of
R
setae. This same characteristic can be used to separate
Gaeolaelaps variabilis
(
Faraji & Halliday, 2009
)
from
G
.
circularis
, in addition to the absence of
z3
and the concave posterior margin of the sternal shield in the
G
.
variabilis
.