A new species of Ologamasus (Acari: Ologamasidae) from Brazil
Author
Moraes, De
text
Zootaxa
2007
1462
61
68
journal article
10.5281/zenodo.176465
d570f70c-47ef-4233-97c5-90bb9c1ea917
1175-5326
176465
Ologamasus cananeiae
sp. n.
Diagnosis.
Tectum with tripartite anteromedial extension; central prong at least twice as long as laterals and occasionally forked. Adult idiosomatic chetotaxy: 6j, 6z, 5s, 5r, 5J, 5Z, 5S, 4R, 5St, 5Jv, 3Zv. Dorsal setae Gnathosoma – Seta all of palp genu rayed Tectum with tripartite anteromedial extension, the central element of which is at least twice as long as laterals. Corniculus with a tooth-like expansion at base of inner margin. Palpcoxal seta with very light median serration. With 9 rows of deutosternal denticles, the seventh including 5 pairs of distinctly larger denticles located outside the deutosternal groove. Fixed cheliceral digit 59(56–60) long, with 5 teeth and a stout
pilus dentilis
; movable digit 55(52–57) long, with 4 teeth.
| spatulate and plumose, except for z1, z2, s1 and s2, |
which |
are |
setiform |
and |
smooth. |
Spermatodactyl |
with |
| sharp tip, about as long as movable cheliceral digit. |
| FEMALE (Fig. 1 A–E) (5 specimens measured). |
FIGURE 1.
Ologamasus cananeiae
sp. n.
. Female: (A) Tectum, (B) Hypostome, (C) Palp genu, (D) Dorsum of idiosoma, (E) Venter of idiosoma. Male: (F) Chelicera, (G) Venter of idiosoma.
Dorsum of idiosoma – Dorsal shield reticulate, except for the smooth anterocentral region, 480(460–500) long, distance between bases of setae s6 111(109–113). Measurements of setae provided on
Table 1
. Setae spatulate and plumose, except for z1, z2, s1 and s2, which are setiform and smooth.
Peritreme – Extending forward to level between z1 and s1.
Venter of idiosoma – With a pair of presternal shields. Sternal shield reticulate, 106(102–110) long, 85(83–88) wide at median level of coxae II. Genital shield with irregular pattern, 86(80–92) wide at level of St5. Ventrianal shield reticulate, 209(205–217) long (from anterior margin to region immediately posterior to postanal seta), postanal seta spatulate and plumose, 23(22–25), with 8 pairs of ventral opisthosomatic setae (Jv1-Jv5, Zv1-Zv3), setiform and smooth, except for Jv5, spatulate and plumose.
Legs – Pretarsi
I 4
,
II 6
,
III 5 and IV 7
, coxa – tarsus I 442(437–455), II 128(126–130), III 109(108–110) and IV 379(375–388).
Spermatheca – Sperm access system not distinguishable.
MALE (
Fig. 1
F, G) (
5 specimens
measured).
Gnathosoma – Tectum similar to that of female, but central prong forked in some specimens. Corniculus subtriangular, with a light constriction near base; in some specimens, 2 small tooth-like structures are distinguished on the inner margin, one at about 1/6th and the other at about 6/10th of its total length from the base. Palpcoxal seta with very light median serration. Fixed cheliceral digit 44(43–45) long, with 4 teeth and a stout
pilus dentilis
; movable digit 42(41–43) long, with 1 tooth. Spermatodactyl with sharp tip, about as long as movable cheliceral digit; in some specimens seemingly shorter, probably because of the position of the chelicera.
Dorsum of idiosoma – Dorsal shield pattern similar to that of female, 483(473–500) long, distance between bases of s6 264(263–265). Measurements of setae provided on
Table 1
. Shape and texture of setae similar to that of female.
Peritreme –
As
in female.
Venter of idiosoma – With a pair of presternal shields. Sternogenital shield reticulate anteriorly to St2 and with parallel, inverted “U” shaped striae posteriorly, except for reticulate area near base of leg III, 150(175– 200) long, 77 wide at median level of coxae II and 56 wide at median level of coxae IV; postanal seta spatulate and plumose, 17,ventral opisthosomatic setae as in female.
Legs – Pretarsi
I 4
,
II 7
,
III 7 and IV 8
, coxa – tarsus I 435(425–440), II 372(360–380), III 263(258–268) and IV 370(363–375).
DEUTONYMPH (
Fig. 2
A, B) (
3 specimens
measured).
Gnathosoma – Tectum similar to that of female, but central prong forked in some specimens. Corniculus similar to that of female. Palpcoxal seta with very light median serration. Fixed cheliceral digit 50 long, with 5 teeth and a stout
pilus dentilis
; movable digit 45 long, with 4 teeth.
Dorsum of idiosoma – Podonotal and opisthonotal shields separate; podonotal shield smooth, except for narrow, reticulate lateral band, 168(164–176) long, 239(230–250) wide at level of r3, with setae j1-j6, z1-z6, s1-s3, s5, s6 and r3, opisthonotal shield reticulate, except for smooth area posterior to J4, 80(79-81) long, 203(200–205) wide at level of S2, with setae J1-J5, Z1-Z5 and S2-S5. Setae S1, r2, r4-r6 and R1-R4 on soft cuticle. Measurements of setae provided on
Table 1
. Setae spatulate and plumose, except for z1, z2, s1, s2, r2 and r4, which are setiform and smooth.
Peritreme –
As
in female.
TABLE 1.
Measurements (µm) of dorsal idiosomal setae of each postembryonic stage of
Ologamasus cananeiae
sp. n.
.
| Seta |
Female |
Male |
Deutonymph |
Protonymph |
Larva |
| j1 |
24(22–25) |
22 |
18(17–20) |
16(15–18) |
8 |
| j2 |
32(30–35) |
31(30–32) |
20 |
15 |
| j3 |
35(32–38) |
35 |
28 |
23 |
9 |
| j4 |
32(30–32) |
34(32–35) |
29(28–30) |
22(20–23) |
10 |
| j5 |
28(27–30) |
25 |
23(22–25) |
20 |
8 |
| j6 |
27 |
27 |
25 |
23 |
14 |
| J1 |
26(25–27) |
27(25–30) |
18(15–20) |
12(10–13) |
| J2 |
30 |
32 |
15 |
10 |
7 |
| J3 |
26(25–27) |
27(25–27) |
18(17–20) |
15 |
8 |
| J4 |
39(37–40) |
36(35–37) |
27(25–28) |
28 |
19 |
| J5 |
32 |
30 |
15 |
13 |
| z1 |
12 |
16(15–17) |
10 |
| z2 |
12 |
10 |
12(10–13) |
12(10–13) |
8 |
| z3 |
22 |
22 |
12(10–13) |
| z4 |
38(37–40) |
36(35–37) |
32(30–33) |
25(23–26) |
16 |
| z5 |
31(30–32) |
32 |
28 |
27(25–28) |
9 |
| z6 |
30 |
32 |
29(28–30) |
27(25–28) |
| Z1 |
34(32–35) |
36(35–37) |
33 |
16(15–18) |
| Z2 |
37(35–40) |
37 |
35 |
23 |
| Z3 |
44(43–45) |
42 |
38(37–40) |
34(33–35) |
9 |
| Z4 |
47(45–52) |
47(45–47) |
58(55–60) |
50 |
20 |
| Z5 |
51(50–52) |
50 |
52(50–53) |
39(38–40) |
20 |
| s1 |
10 (7–12) |
11(10–12) |
7(5–8) |
| s2 |
9(7–10) |
10 |
8 |
| s3 |
13(10–15) |
14(12–15) |
13 |
13 |
| s5 |
41(40–42) |
38(37–40) |
36(33–37) |
26(25–28) |
21 |
| s6 |
40 |
37 |
43 |
28(27–30) |
20 |
| S1 |
39(37–40) |
38(37–40) |
24(23–25) |
18(17–20) |
| S2 |
43(42–45) |
42 |
34(33–35) |
15 |
| S3 |
50(47–52) |
45(42–47) |
39(38–40) |
27(25–28) |
10 |
| S4 |
55(54–57) |
56(55–57) |
41(40–43) |
22(20–23) |
5 |
| S5 |
55 |
52 |
43 |
| r2 |
12(10–13) |
12 |
5 |
| r3 |
62(60–65) |
61(60–62) |
56(55–58) |
43(42–45) |
| r4 |
10(7–12) |
8(7–10) |
6(5–8) |
| r5 |
12 |
12 |
12(10–13) |
8(7–10) |
| r6 |
12 |
11(10–12) |
13 |
9(8–10) |
| R1 |
15 |
15 |
14(13–15) |
8(7–10) |
| R2 |
20 |
16(15–17) |
18 |
| R3 |
19(17–20) |
14(12–15) |
15 |
| R4 |
15 |
13(11–14) |
9(8–10) |
FIGURE 2.
Ologamasus cananeiae
sp. n.
. Deutonymph: (A) Dorsum of idiosoma, (B) Venter of idiosoma. Protonymph: (C) Dorsum of idiosoma, (D) Venter of idiosoma.
Venter of idiosoma – Sternal shield, 166(163–170) long, 74(73–75) wide at median level of coxae II and 50 wide at median level of coxae IV, with setae St1-St4. Seta St5 on soft cuticle. Anal shield reticulate, 77(73– 80) long and 112(110–115) wide at level of paranal setae; postanal seta spatulate and plumose, 23(20–25), ventral opisthosomatic setae as in female, but all on soft cuticle.
Legs – Pretarsi
I 4
,
II 6
,
III 5 and IV 7
, coxa – tarsus I 358(350–365), II 292(280–300), III 258(255–263) and IV 326(310–348).
PROTONYMPH (
Fig. 2
C, D) (
3 specimens
measured)
Gnathosoma – Tectum similar to that of female, but central prong forked in some specimens. Corniculus similar to that of female. Palpcoxal seta with very light median serration. Fixed cheliceral digit 43 long, with 5 teeth and a stout
pilus dentilis
; movable digit 40 long, with 4 teeth.
Dorsum of idiosoma – Podonotal and opisthonotal shields separate, podonotal shield smooth, except for narrow, reticulate lateral band, 134(131–137) long, 154(152–155) wide at level of r3, with setae j1-j6, z2, z4, z5; s3, s5, s6 and r3, opisthonal shield reticulate, except for smooth area posterior to J4 and Z4, 64(63–66) long, 125 wide at level of S3, with setae J3-J5, Z3-Z5, S3, S4. Setae J1, J2, Z1, Z2, S1, S2, r5, r6 and R1 on soft cuticle. Measurements of setae provided on
Table 1
. Setae spatulate and plumose, except j5, J2, J5, z2, s3, r5, r6 and R1, which are setiform and smooth, and j1 and J1, spatulate and smooth. With a pair of digitiform expansions laterad of Z5.
Peritreme – Extending forward almost to level of r5.
Venter of idiosoma – Presternal and sternal shields indistinguishable; setae St1-St3 and St5 on soft cuticle. Anal shield reticulate, 54(53–55) long and 85 wide at level of posterior margin of anal opening, postanal seta spatulate and plumose, 21; ventral opisthosomatic setae Jv1, Jv2, Jv5 and Zv2 on soft cuticle, setiform and smooth, except for Jv5, spatulate and plumose.
Legs – Pretarsi
I 4
,
II 5
,
III 5 and IV 6
, coxa – tarsus I 328(325–333), II 233(228–238), III 217(213–220) and IV 269(268–272).
LARVA (
Fig. 3
A, B) (
3 specimens
measured)
Gnathosoma – Tectum similar to female. Corniculus similar to that of female but with basal tooth-like structure much less pronounced. Palpcoxal seta smooth. Fixed cheliceral digit 16 long, with 3 teeth;
pilus dentilis
not distinguishable; movable digit 14 long, with 2 teeth.
FIGURE 3.
Ologamasus cananeiae
sp. n.
. Larva: (A) Dorsum of idiosoma, (B) Venter of idiosoma.
Dorsum of idiosoma – Podonotal and opisthonotal shields indistinguishable. Measurements of setae provided on
Table 1
. Setae spatulate and plumose, except j1, j3, j4, j5; z2, z5 and S4 which are setiform and smooth.
Venter of idiosoma – No shield distinguishable. Setae St1-St3 on soft cuticle. Postanal seta setiform and smooth, 9, setae Jv1, Jv2 and Zv2 setiform and smooth.
Legs – Pretarsi
I 3
,
II 4 and III 4
; coxa – tarsus
I 72
,
II 49
and
III 48
.
Locality and
type
material.
Holotype
female, two
paratype
females and three
paratype
deutonymphs from forest litter taken at Cananéia, State of São Paulo,
Brazil
,
11-X-2000
, A. C. Pereira; three
paratype
females from the same substrate and locality,
18-I-2000
, A. R. Oliveira; two
paratype
protonymphs from the same substrate and locality,
19-IV-2000
, A. R. Oliveira; allotype male and one
paratype
protonymph from the same substrate and locality,
12-VII-2000
, A. R. Oliveira; two
paratype
males from the same substrate and locality,
15-II-2001
, A. C. Pereira; one
paratype
larva from the same substrate and locality,
13-I-2001
, A. R. Oliveira. One
paratype
male from forest litter taken at Pariquera-Açu, State of São Paulo,
Brazil
,
13-II-2001
, A. C. Pereira; one
paratype
male from the same substrate and locality,
13-VII-2001
, E. S. Silva. Two
paratype
larvae from a laboratory rearing initiated with specimens collected on the campus of “Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo”, at Piracicaba, State of São Paulo,
Brazil
,
10-VI- 2005
, E. S. Silva. All
types
deposited at
ESALQ
/
USP
– Universidade de São Paulo; Escola Superior de Agricultura Luiz de Queiroz; Departamento de Entomologia, Fitopatologia e Zoologia Agrícola; 13418-900 Piracicaba-SP;
Brazil
.
Other specimens identified as belonging to this species were: 6 protonymphs, 7 deutonymphs,
25 adult
females and
11 adult
males from the same substrate and locality as the
holotype
and collected on IV/VII/
X- 2000
, and II/IV/VII/
X-2001
. One protonymph, 3 deutonymphs,
9 adult
females and
16 adult
males were taken from forest litter at Pariquera-Açu, State of São Paulo,
Brazil
, I/
X-2000
and
X-2001
.
Etymology.
The species name
cananeiae
is the genitive of Cananéia, the
type
locality of the new species.
Remarks.
Ologamasus foliatus
Karg, 1976
is similar to
O
. cananeiae
sp. n.
, but differs in having seta Zv4 (seta ISv of
Lee, 1970
) and in lacking setae s1 and s2. In addition,
O
. foliatus
has setae j1, j2 and postanal setiform and smooth, and tectum with 2 pairs of lateral pointed prongs in addition to the central prong. Males of
O
.
foliatus
differ in having the distal end of the spermatodactyl blunt rather than pointed.
The following dichotomous key separates females of currently known
Ologamasus
species.