Two new species of orb-weaving spiders of the genus Larinia (Araneae, Araneidae) in meridional Brazil
Author
Ott, Ricardo
Author
Rodrigues, Everton Nei Lopes
text
Zootaxa
2017
4247
1
89
93
journal article
36202
10.11646/zootaxa.4247.1.13
cd66d089-68a7-44e3-9245-c2a1666e7ad0
1175-5326
437994
7F0B828F-8B47-4E2E-85D7-9866A032CBD3
Larinia dubia
new species
Figs. 1–10
,
22, 23
,
26
Type material.
Holotype male from Aceguá, 31°52'00"S;
54°09'00"W
,
Rio
Grande do Sul
,
Brazil
,
V.2011
,
L. R. Podgaiski
leg., deposited at
MCN
52123
. Paratypes: female, Estação Ecológica de Aratinga, 29°26'52"S;
50°35'02"W
,
São Francisco de Paula
,
Rio
Grande do Sul
,
Brazil
,
21.XII.2012
,
Equipe L. E. I.
UFRGS
leg. (
MCN
52121)
;
female,
Lavras do Sul
,
30°48'46"S
;
53°53'42"W
,
Rio
Grande do Sul
,
Brazil
,
V. 2012
,
L. R. Podgaiski
leg. (
MCN
52122)
; male (MCN 52126).
Etymology.
The species epithet is a Latin adjective meaning “dubious.” It refers to doubts among species, difficult to define.
Diagnosis.
Male palps of
L. dubia
new species
are similar to those of
L. tucuman
(
Figs. 20, 21
; see also Harrod
et al.
1990: 251, figs. 14, 15) in having a triangular shaped embolus (
Fig. 5
) and a small process distally on tegulum (
Fig. 6
), but differ from the last species by the shape of median apophysis with robust pointed processes with their tips distant from each other around the same length of this sclerite (
Figs. 22, 23
). Females of
L. dubia
new species
can be easily separated from all American species by the rectangular-shaped scape, longer than wide (
Fig. 8
), which resembles that of
L. phthisica
(L. Koch, 1871)
from
Australia
(see
Grasshoff, 1970
: 224, fig. 8h;
Framenau & Scharff, 2008
: 240, fig. 30), but differs from it by having a longer scape, with a stronger posterior rim (
Fig. 8
). The longitudinal abdominal pattern stripes (
Figs. 1, 2
) separate
L. dubia
new species
from the sympatric species
L. bivittata
and
L. tucuman
. This abdominal pattern is similar to
L. minor
(Bryant, 1945)
and
L. lampa
(see Harrod et al., 1990: 251, fig. 8 and 255, fig. 18); but it differs from both species by the rectangular scape.
Description.
Appearance, male
holotype
; palp and measurements, male
paratype
(MCN 39126). Carapace yellow with brown median line with dark areas surrounding the cephalic area (
Fig. 1
). Chelicerae, coxae and legs yellow. Labium yellow anteriorly, blackish at posterior border. Endites yellow with some blackish scattered pigmentation laterally (
Fig. 3
). Sternum yellow, surrounded by a darker border and some lateral black spots, darker at posterior end (
Fig. 3
). Abdomen dorsum whitish, with white longitudinal bands which becomes slightly darker posteriorly (
Fig. 1
); venter grayish with a light central white spot, darker anteriorly and on the spinnerets (
Fig. 3
). Palp: tegulum with distal pointed process (apical extension), median apophysis with broad prolateral process and triangular shaped posterior process (
Figs. 5–7
,
22, 23
). Total length 3.64. Carapace 1.29 long, 0.93 wide. AME 0.11; PME 0.10; ALE and PLE
0.06 in
diameter. AME-AME 0.11, PME-PME 0.05, ALE-PLE 0.01. Abdomen oval 1.6 long and 0.89 wide. First femur 1.82 long, patella and tibia 2.53, metatarsus 2.21, tarsus 0.73. Second patella and tibia 2.17 long, third 1.10, fourth 1.98.
Female.
Paratypes
. Appearance and measurement (MCN 52122); epigynum (MCN 52121). Color as in male, but with much darker pigmentation on endites, labium sternum and abdominal ventral area. Epigynum bearing a mesal longitudinal subrectangular scape (
Fig. 8
) and circular spermathecae (
Figs. 9, 10
). Total length 4.70. Carapace 1.73 long, 1.27 wide. AME 0.10, PME 0.08, ALE and PLE
0.06 in
diameter. AME-AME 0.08, PME-PME 0.04, ALE-PLE 0.01. Abdomen oval 3.15 long and 1.73 wide. First femur 1.78, patella and tibia 2.40, metatarsus 2.01, tarsus 0.74. Second patella and tibia 2.27, third 1.16, fourth 2.14.
Variation.
Males (N=5); total length 2.77–3.38; carapace 1.20–1.44. Females (N=2); total length 3.64–4.75; carapace 1.29–1.68.
Other
material examined.
BRAZIL
.
Rio
Grande do Sul
: male,
Tramandaí
,
29°59'06"S
; 50°08'02"W,
31.V.1976
, H. Bischoff leg. (MCN 4335);
male,
Guaíba
,
30°06'50"S
; 51°19'30"W,
24–27.XII.1992
, A. B. Bonaldo leg. (MCN 22646);
male,
Guaíba Country Club
,
Eldorado do Sul
,
29°59'49.7"S
; 51°18'28.3"W, A. B. Bonaldo leg. (MCN 22687);
male,
Lavras do Sul
,
30°48'46"S
; 53°53'42"W,
XII.2011
, Equipe L. E. I. UFRGS leg. (MCN 52124);
male,
Lavras do Sul
,
V.2011
,
L. R. Podgaiski
leg. (
MCN
52126); male,
Parque Estadual Tainhas
,
28°53'06"S
; 50°21'28"W, Jaquirana,
21.XI.2012
, Equipe L. E. I. UFRGS leg. (MCN 52125); male, IRGA, 29°57'03"S; 51°05'38"W, Cachoeirinha,
16.XI.2004
, E. N. L. Rodrigues leg. (MCN 39126).
Natural History.
All specimens collected by L. R. Podgaiski, Ronei Baldissera and Equipe L. E. I. (Camila F. Dias pers. comm.) and E. N. L.
Rodrigues (Rodrigues
et al
., 2008
;
2009
) by the sweeping net in grasslands, shrubs, forest edges. This species was also collected by beating tray in shrubs and riparian forest edges (
Rodrigues
et al.,
2015
).
Distribution.
Known for state of
Rio Grande do Sul
,
Brazil
.