A new eriophyoid mite in the genus Disella from Ilex paraguariensis in Brazil
Author
Navia, Denise
Author
Flechtmann, Carlos H. W.
text
Zootaxa
2005
2005-08-19
1037
23
28
journal article
50988
10.5281/zenodo.169761
bcf3c0e7-a1c5-4a8f-a76f-271df4d43c7c
11755326
169761
Disella ilicicola
n. sp.
(
Figs. 1
and
2
)
Diagnosis
— Sixrayed empodia; short sternal line; dorsal shield tubercles well ahead of rear shield margin, scapular setae (
sc
) shorter than distance of its bases to rear shield margin; microtubercles on ventral opisthosomal annuli absent on two longitudinal bands extending back from sides of rear end of genitalia, merging at half the distance of ventral seta I (
d
) to II (
e
) and ending at ca. half the distance of ventral seta II (
e
) to III (
f
).
Female
(Measurements of
holotype
and ranges of eight
paratypes
) — Body robust, fusiform, 188 (169–197) long, 78 (76–80) wide; colour in life yellowish.
Gnathosoma
projecting downwards, 20 (20–23) long; basal seta (
ep
) 3 (2–3) long; antapical seta (
d
) 3 (3–4) long. Chelicerae 20 (20–22) long; oral stylets 12 (12–16) long.
Prodorsal shield
43 (42–46) long, 75 (71–77) wide, subretangular. Scapular seta (
sc
) 8 (7–8) long on prominent tubercles 31 (28–33) apart, directing setae up and backwards; tubercles placed ahead of rear shield margin on 2/3 posterior shield. Shield design of complete median line, admedian lines slightly sinuous, two transversal lines connecting median and admedian lines delimiting six median cells; irregular, curved submedian lines; many curved and discontinuous lines and dashes present on lateral and rear shield; in a lateral view, large cells occupy anterior shield margin. Frontal lobe broadly rounded anteriorly, 4 (4–5) long, base 24 (24–28) wide.
Legs
with tibia fused to tarsus. Leg
I 20
(19–21) long; femur 9 (8– 10) long, femoral seta (
bv
) 5 (5–6) long; genu 4 (3–4) long, genual seta (
l”
) 21 (20–23) long; tarsus 4 (4–5) long, lateral seta (
ft”
) 20 long, dorsal seta (
ft’
) 16 (15–18) long, unguinal seta (
u’
) 6 (5–7) long, solenidion 6 (6–7) long; empodium 6 (5–7) long, 6 (6–7) rayed. Leg
II 17
(17–19) long; femur 9 (8–9) long,
bv
6 (5–8) long; genu 3 long,
l"
7 (6–8) long; tarsus 5 long,
ft"
20 (19–20) long,
ft’
2 (2–3) long,
u’
4 (4–5) long, solenidion 6 (5– 6) long; empodium 5 long, 6 (5–6) rayed.
Coxigenital area
smooth. Sternal line 4 (4–6) long. Coxal seta I (
1b
) absent; coxal seta II (
1a
) 18 (16–19) long, 11 (9–11) apart; coxal seta III (
2a
) 26 (25–28) long, 26 (23–27) apart. Four coxigenital semi annuli, smooth.
Genitalia
20 (19–20) wide, 19 (17–21) long; coverflap with one or two transverse arched lines on the rear portion; central area smooth; 3 (3–4) semiannuli, microtuberculate, on anterior coverflap; genital seta (
3a
) 8 (7–9) long.
Opisthosoma
with two slight ridges extending on first 2 (2–4) annuli and evenly arched on median and posterior region; 42 (40–45) dorsal annuli, smooth; ventrally with 42 (40–45) annuli, microtubercles absent in two longitudinal bands extending back from sides of rear end of genitalia, merging at half the distance of ventral seta I (
d
) to II (
e
) and ending at ca. half the distance of ventral seta II (
e
) to III (
f
), placed slightly ahead of rear border of annuli, more elongated on telosome (caudad of line across bases of seta
f
). Lateral seta (
c2
) 20 (17–20) long, on annulus 1–2. Ventral seta I (
d
) 20 (19–21) long, 37 (36–41) apart, 4 (4–6) microtubercles apart, on annulus 10 (10–13); ventral seta II (
e
) 7 (6–8) long, 20 (16–20) apart, on annulus 22 (20– 26); ventral seta III (
f
) lateral, 17 (17–18) long, 19 (16–20) apart, 11 (11–15) microtubercles apart, on annulus 37 (35–40). Caudal seta (
h2
) 37 (36–40) long; accessory seta (
h1
) minute.
FIGURE 1.
Disella ilicicola
n. sp.
D. — Dorsal habitus of female. V. — Ventral habitus of female.
Male
(n=1) — Smaller than female, 106 long, 69 wide.
Gnathosoma
19 long; basal seta (
ep
) 3 long; antapical seta 4 long. Chelicerae 18 long; oral stylets 12 long.
Prodorsal shield
44 long, 67 wide. Scapular seta (
sc
) 7 long, 26 apart. Frontal lobe 4 long, base 22 wide.
Legs
as in female. Leg
I 20
long; femur 9 long, femoral seta (
bv
) 4 long; genu 3 long, genual seta (
l"
) 23 long; tarsus 5 long, lateral seta (
ft"
) 18 long, dorsal seta (
ft’
) 15 long, unguinal seta (
u’
) 5 long, solenidion 6 long; empodium 6 long, as in female, 6rayed. Leg
II 17
long; femur 8 long,
bv
5 long; genu 3 long,
l"
7 long; tarsus 4 long,
ft"
19 long,
ft’
2 long,
u’
4 long, solenidion 5 long; empodium 5 long, 5rayed.
Coxigenital area
smooth. Coxal seta I (
1b
) absent; coxal seta II (
1a
) 16 long, 8 apart; coxal seta III (
2a
) 24 long, 22 apart.
Genitalia
16 wide, 11 long, smooth, papillae as figured; genital seta (
3a
) 9 long.
Opisthosoma
with 40 dorsal annuli; 42 ventral annuli. Lateral seta (
c2
) 15 long, on annulus 1. Ventral seta I (
d
) 16 long, 30 apart, 5 microtubercles apart, on annulus 10; ventral seta II (
e
) 8 long, 14 apart, on annulus 22–23; ventral seta III (
f
) 12 long, 18 apart, on annulus 37. Caudal seta (
h2
) 37 long; accessory seta (
h1
) minute.
Type material —
female
holotype
,
8 female
and
1 male
paratypes
,
from
Ilex paraguariensis
Saint Hilaire (Aquifoliaceae)
,
Chapecó
,
Santa Catarina
,
Brazil
,
20 January 2004
, collected by
L. A. Chiarardia
and
J. M. Milanez
, on 7 microscopic preparations, in the collection of Departamento de Entomologia, Fitopatologia e Zoologia Agrícola, Universidade de São Paulo, ESALQ, Piracicaba, São Paulo, Brazil and paratypes in the reference collection of Laboratorio de Quarentena Vegetal, Embrapa Recursos Genéticos e Biotecnologia, Brasília, Distrito Federal, Brazil
.
Relation to host
— vagrant on inner surface of mature leaves causing chlorosis.
Etymology
— The specific designation
ilicicola
is derived from the genus,
Ilex
, of the host plant, plus
cola
, L.
colus
,
a
,
um
, dwelling in, inhabitant.
FIGURE 2.
Disella ilicicola
n. sp.
L. — Lateral habitus of female. GM. — Genitalia of male. L1. — Leg I. L2. — Leg II. E. — empodium.
Remarks
—
Disella ilicicola
n. sp.
is, so far, the only species in the genus with a 6 rayed empodium; this structure being 4, 5 or 7rayed in the other known species. It is close to
D. talisiae
(
Keifer 1969
)
in the absence of ventral microtubercles in two longitudinal bands (in the other known species the ventral annuli are entirely microtuberculate), but differs in the opisthosomal annulation: 22 dorsal and 34 ventral annuli in
D. talisiae
and 40
–
45 dorsal and ventral annuli in
D. ilicicola
n. sp.
. It also shares with
D. talisiae
the presence of one or two transverse arched lines on the rear portion of the otherwise smooth coverflap; in the other known species the coverflap is either smooth, beset with longitudinal lines or is granulated in addition to the presence of crescent lines.