Exocora medonho , Lemos, Yuji & Brescovit, Antonio D., 2013

Lemos, Yuji & Brescovit, Antonio D., 2013, New species of the spider genus Exocora Millidge, 1991 (Araneae: Linyphiidae) from Brazil, Zootaxa 3599 (3), pp. 261-278: 268-271

publication ID

http://dx.doi.org/10.11646/zootaxa.3599.3.4

publication LSID

lsid:zoobank.org:pub:8570920B-EAC4-48A6-A831-6463682B36D1

persistent identifier

http://treatment.plazi.org/id/03C72F26-1067-4140-FF4C-F910FB11A419

treatment provided by

Plazi

scientific name

Exocora medonho
status

new species

Exocora medonho  new species

Figs. 8View FIGURE 8 A–D; 9 A–F; 15 D; 16 D; 17

Type: Holotype 1 ɗ, from Floresta da Cicuta (22 ° 31 'S, 44 °06'W), Volta Redonda, Rio de Janeiro, Brazil, 11–18 /VI/ 2001, Equipe Biota col. ( IBSPAbout IBSP 143759). Paratype: 2 ɗ 5 Ψ, Floresta da Cicuta (22 ° 31 ' 54 ''S; 44 °06' 27 ''W), Volta Redonda, Rio de Janeiro, Brazil, 11–18 /VI/ 2001, Equipe Biota col. ( IBSPAbout IBSP 143751, 143752, 143762, 143755, 143762).

Etymology: The species epithet is a name taken in apposition and refers to a nickname of Igor Cizauskas.

Diagnosis: Males of Exocora medonho  n. sp. differ from other Exocora  (except E. nogueirai  n. sp. and E. una n. sp.) by the shape of lamella characteristica, longer than wide and more rounded at the proximal part, with a simple and curved anterior extension, and by the straight embolic membrane ( Figs 8View FIGURE 8 A, B). Females are diagnosed by the shape of epigynal dorsal plate, with a constriction in the middle of anterior margin, by the simple curved copulatory duct, and by the presence of a membranous sac, that surrounds each spermatheca ( Figs 8View FIGURE 8 C, D; 15 D; 16 D).

Description: Male (Holotype IBSPAbout IBSP 143759): Total length 1.5. Carapace 0.74 long, 0.62 wide. Carapace yellowish with lateral dark markings in a "V" shape. Sternum 0.4 long, 0.42 wide, yellowish with slight darkening of the margins. Clypeus 0.14 high. Chelicerae promargin with 2 teeth, retromargin with 3 teeth. Abdomen yellowish with dark markings, concentrated near the spinnerets, and some white spots on the abdomen ( Figs 9View FIGURE 9 A, B). Eyes diameter and interdistances: AME 0.06, ALE 0.08, PME 0.07, PLE 0.07, AME-AME 0.01, PME-PME 0.05, AME-ALE 0.02, PME-PLE 0.02. Eyes grouped and projected above the clypeus. Ocular area with thick bristles ( Figs 9View FIGURE 9 A, B). Coxa IV separation 1.4 times their width. Femur I/II/III/IV 0.76 / 0.74 / 0.52 / 0.68; patella I 0.22; tibia I 0.72; metatarsus I 0.76; tarsus I 0.44. Legs yellowish with brown markings along the articles. Tibia I prolateral macroseta thick and sinuous ( Fig. 9View FIGURE 9 C). TmI 0.18. Palpal tibia without apophysis. Protegulum present. Embolus long and filiform, origin posteriorly, curves to the ectal side and runs anteriorly, getting into the lamella characteristica. Embolic membrane long, projected anteriorly ( Figs 8View FIGURE 8 A, B).

Female (Paratype IBSPAbout IBSP 143762): Total length 1.8. Carapace 0.66 long, 0.56 wide. Sternum 0.38 long, 0.42 wide. Clypeus 0.12 high. Chelicerae promargin with 3 teeth, retromargin with 4 teeth. Body color pattern as in male. Abdomen with white spots larger and more conspicuous ( Figs 9View FIGURE 9 D, E). Eyes diameter and interdistances: AME 0.05, ALE 0.08, PME 0.08, PLE 0.09, AME-AME 0.01, PME-PME 0.04, AME-ALE 0.02, PME-PLE 0.02. Eyes in a group, less projected and fewer bristles in the ocular area than in the male ( Fig. 9View FIGURE 9 D, E). Coxa IV separation 1.66 times their width. Femur I/II/III/IV 0.7 / 0.7 / 0.52 / 0.68; patella I 0.22; tibia I 0.64; metatarsus I 0.64; tarsus I 0.42. Legs as in male. Tibia I prolateral macroseta thinner and straight than in male ( Fig. 9View FIGURE 9 F). TmI 0.19. Epigynum with ventral plate prominent ( Figs 8View FIGURE 8 C; 15 D). Spermathecae rounded. Copulatory ducts originating from the posterior part of spermatheca, presents only one single turn in the ventral direction. Copulatory opening at mesal side. Fertilization ducts originating from posterior part of the spermathecae, running mesally ( Figs 8View FIGURE 8 D; 16 D).

Variation: Males (n= 4): Total length 1.36–1.56; carapace length 0.64–0.74; carapace width 0.54–0.6; femur I length 0.72–0.82. Females (n= 10): Total length 1.38–1.9; carapace length 0.62–0.68; carapace width 0.54–0.6; femur I length 0.64–0.74.

Distribution: Known only for type-locality ( Fig. 17View FIGURE 17).

Material examined (N= 17): BRASIL, Rio de Janeiro: Volta Redonda, Floresta da Cicuta, (22 ° 31 ' 54 ''S; 44 ° 6 ' 27 ''W), 5 ɗ 12 Ψ, 11–18 /VI/ 2001, Equipe Biota col. ( IBSPAbout IBSP 143754, 143756– 143761).

IBSP

Instituto Biologico de Sao Paulo

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

Genus

Exocora