Larinia dubia , Ott, Ricardo & Rodrigues, Everton Nei Lopes, 2017

Ott, Ricardo & Rodrigues, Everton Nei Lopes, 2017, Two new species of orb-weaving spiders of the genus Larinia (Araneae, Araneidae) in meridional Brazil, Zootaxa 4247 (1), pp. 89-93: 89-90

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Larinia dubia

new species

Larinia dubia  new species Figs. 1–10View FIGURES 1 – 10, 22, 23View FIGURES 20 – 25. 20, 21, 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 52123View Materials  . 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 52121View Materials)  ; female, Lavras do Sul, 30°48'46"S  ; 53°53'42"W, Rio Grande do Sul, Brazil, V. 2012, L. R. Podgaiski leg. ( MCN 52122View Materials)  ; 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, 21View FIGURES 20 – 25. 20, 21; see also Harrod et al. 1990: 251, figs. 14, 15) in having a triangular shaped embolus ( Fig. 5View FIGURES 1 – 10) and a small process distally on tegulum ( Fig. 6View FIGURES 1 – 10), 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, 23View FIGURES 20 – 25. 20, 21). Females of L. dubia  new species can be easily separated from all American species by the rectangular-shaped scape, longer than wide ( Fig. 8View FIGURES 1 – 10), 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. 8View FIGURES 1 – 10). The longitudinal abdominal pattern stripes ( Figs. 1, 2View FIGURES 1 – 10) 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 39126View Materials). Carapace yellow with brown median line with dark areas surrounding the cephalic area ( Fig. 1View FIGURES 1 – 10). Chelicerae, coxae and legs yellow. Labium yellow anteriorly, blackish at posterior border. Endites yellow with some blackish scattered pigmentation laterally ( Fig. 3View FIGURES 1 – 10). Sternum yellow, surrounded by a darker border and some lateral black spots, darker at posterior end ( Fig. 3View FIGURES 1 – 10). Abdomen dorsum whitish, with white longitudinal bands which becomes slightly darker posteriorly ( Fig. 1View FIGURES 1 – 10); venter grayish with a light central white spot, darker anteriorly and on the spinnerets ( Fig. 3View FIGURES 1 – 10). Palp: tegulum with distal pointed process (apical extension), median apophysis with broad prolateral process and triangular shaped posterior process ( Figs. 5–7View FIGURES 1 – 10, 22, 23View FIGURES 20 – 25. 20, 21). 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 52122View Materials); epigynum ( MCN 52121View Materials). 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. 8View FIGURES 1 – 10) and circular spermathecae ( Figs. 9, 10View FIGURES 1 – 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 52126View Materials); 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.


McNeese State University


Universidade Federale do Rio Grande do Sul