Mesilla vittiventris Simon, 1903

Martínez, Leonel, Brescovit, Antonio Domingos & Oliveira, Luiz Fernando M., 2020, Two new species of the ghost spider genus Macrophyes O. Pickard-Cambridge 1893 from Colombia and description of the first male of Mesilla Simon, 1903 (Araneae: Anyphaenidae: Anyphaeninae), Zootaxa 4853 (4), pp. 581-590: 586

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Mesilla vittiventris Simon, 1903


Mesilla vittiventris Simon, 1903  

Figures 3A –H View FIGURE 3 , 4 View FIGURE 4 .

Mesilla vittiventris Simon 1903:30   (Female holotype from Cayembe , Pichincha, Ecuador, deposited in MNHN 20286 View Materials , examined).

Diagnosis. Males of Mesilla vittiventris Simon, 1903   can be distinguished by their very long, thin cymbium; a long median apophysis distally erected and single, extremely short retrolateral tibial apophysis ( Figs 3 View FIGURE 3 C–E). Females are characterized by the epigynum with long, wide lateral borders, curved inward and with a septum; a long atrium and small seminal receptacles situated on the anterior third of the copulatory ducts ( Figs 3G, H View FIGURE 3 ).

Note. Brescovit (1997) illustrated the internal genitalia of the Mesilla vittiventris   type specimen. That epigynum, being detached from the abdomen and suffering from dissection, did not present the copulatory ducts, only fertilization ducts ( Brescovit 1997, fig. 151). Here, new illustrations of the well preserved epigynal plate of the Colombian specimen belonging to this species are included.

Description. Male. (ICN–Ar 9696). Carapace yellowish. Chelicerae brown, labium and endites brown. Sternum reddish-brown. Legs yellow. Abdomen dorsally grayish; ventrally yellow. Spinnerets yellow ( Fig. 3A View FIGURE 3 ). Total length 7.12, carapace length 2.49, width 1.99, high 0.68. Clypeus height 0.15. Eye diameters and interdistances: AME 0.10, ALE 0.18, PME 0.2, PLE 0.21; AME–AME 0.23, AME–ALE 0.35, PME–PME 0.48, PME–PLE 0.38, ALE–PLE 0.43. Chelicerae 1.72 long, distal large retromarginal teeth, six promarginal teeth, six retromarginal denticle Leg I—femur 6.13/ patella 0.86/ tibia 7.08/ metatarsus 6.82/ tarsus 1.87/ total 22.76; II—5.77/ 0.81/ 6.68/ 6.59/ 1.85/ 21.7; III—3.3/ 0.81/ 2.63/ 3.54/ 1.17/ 11.45; IV—4.42/ 0.73/ 4.77/ 6.31/ 1.55/ 17.78. Leg spination ( Fig. 3F View FIGURE 3 ): I—II d1-1-0-0-0, v2-2-2-2-2, p0, metatarsus p1-0-0-0-0; III—tibia v0-2-2-0-0, p0-1-1-0-0, r1-1-1-1-0, metatarsus v2-0-0-2-0; IV—tibia v1-1-1-2-1, metatarsus v1-0-1-1-1, p0-2-0-1-2. Abdomen, twice the length of carapace, length 4.61, epigastric furrow 0.68 from tracheal spiracle, spiracle 2.93 from base of spinnerets. Palp: retrolateral tibial apophysis very small, apically sharpened; cymbium shorter than tibia; subtegulum inconspicuous; tegulum longer than wide; median apophysis very long, sinuous and apically inserted; embolus long, basally inserted on the tegulum, apically filiform, with narrow base ( Figs 3 View FIGURE 3 C–E).

Female. Described by Brescovit (1997), figs 150-151. Complementary description: Dorsal body as in Fig. 3B View FIGURE 3 . Epigynum: lateral borders sclerotized, parallel and wide; atrium long; internally with short, wide copulatory ducts; seminal receptacles small and medially situated on the copulatory ducts; spermathecae large, oval, posteriorly positioned; fertilization ducts as long as the spermathecae ( Figs 3G, H View FIGURE 3 ).

Variation. Males (n=3): total length: 7.03–8.20; carapace length: 2.05–2.71; femur I length: 6.13–6.66.

Distribution. Known from Colombia and Ecuador ( Fig. 4 View FIGURE 4 ; Brescovit 1997: 65).

Material examined. Three males from surroundings of the entrance of the Reserva Natural Río Ñambí , (1°17′4.38″N; 78°5′18.24″W), 1179 m, Vereda Altaquer , Barbacoas, Nariño, Colombia, 5.VII.2017, W. Galvis leg. (ICN-Ar 9696 [m#1], ICN-Ar 10644 [m#2]). GoogleMaps   Female from Alto del Mirador (2°58′0″N, 78°11′0″W), 180m, Parque Nacional Natural Gorgona, Cauca, Colombia, 30.XI.2000, H. Torrez leg. (ICN-Ar 6271) GoogleMaps   .














Mesilla vittiventris Simon, 1903

Martínez, Leonel, Brescovit, Antonio Domingos & Oliveira, Luiz Fernando M. 2020

Mesilla vittiventris

Simon 1903: 30