Medionops, Sánchez-Ruiz, Alexander & Brescovit, Antonio D., 2017

Sánchez-Ruiz, Alexander & Brescovit, Antonio D., 2017, A new genus with seven species of the Subfamily Nopinae (Araneae, Caponiidae) from the Neotropical region, Zootaxa 4291 (1), pp. 117-143 : 122

Key to the species of Medionops n. gen.

1 Abdomen dorsally with remarkable pattern of spots, chevrons or bands...........................................2

- Abdomen dorsally with unremarkable pattern of very fine lines, almost unnoticeable................................6

2 Abdomen dorsally with five pairs of irregular dark gray spots forming two longitudinal bands.........................3

- Abdomen dorsally with five whitish gray chevrons fine marks..................................................4

3 Abdomen dorsally with big longitudinal pairs of irregular dark gray spots, almost touching ( Figs 18 A–B); crista short, spiders more than 5 mm total length....................................................................... M. simla

- Abdomen dorsally with small longitudinal pairs of irregular dark gray spots, not touching ( Fig. 10 A); crista absent ( Fig. 9 K), spiders less than 3 mm total length.......................................................... M. claudiae n. sp.

4 Whitish gray chevron pattern on abdomen uniform among marks ( Fig. 6 A); tip of embolus with several blade–shaped projections ( Figs 2 J–L); female posterior plate with an internally projected median septum ( Figs 4 J–L)........... M. blades n. sp.

- Whitish gray chevron pattern on abdomen not uniform among marks, the proximal being the largest ( Figs 8 A–B; 14A–B); tip of embolus with a short terminal triangular projection ( Figs 7 D–E; 12C–F) and females without septum on the internal posterior plate ( Figs 7 G–I; 13J–L)............................................................................5

5 The proximal whitish gray chevron mark on abdomen is thick, longitudinal line reaching the pedicel ( Fig. 14 A); crista and gladius absents ( Figs 11 C,D,F; 13B,C)........................................................... M. murici n. sp.

- The proximal whitish gray chevron mark on abdomen is very fine, without longitudinal line reaching the pedicel ( Fig. 8 A); crista short, and gladius with the traditional shape among nopine ( Dupérré, 2014: fig.4)....................... M. cesari

6 Crista short but noticeable, not reaching one fourth of metatarsal length; spider more than 4.5 mm total length; males with embolus length more than three times the greater diameter of the bulb ( Figs 19 G–H), known only from Venezuela ( Fig. 21 )........................................................................................... M. tabay n. sp.

- Crista unnoticeable ( Figs 15 D–F); spiders less than 3.5 mm total length; males with embolus length over two times the largest diameter of the bulb ( Figs 16 A–B), known only from southeast coast of Brazil ( Fig. 21 )............... M. ramirezi n. sp.

Figures

FIGURE 2. Medionops blades n. sp., male from type locality (AMNH). A carapace, lateral view. B clypeus, lateral view. C carapace, dorsal oblique view. D sternum and mouthparts, ventral view. E labium and endites, ventral view (arrows point to the acute projections). F serrula, ventral oblique view. G chelicerae, lateral view. H left palp, prolateral view. I tibial brush, prolateral view. J tip of palpal embolus, prolateral view (arrow points to the blade – shaped projection). K tip of palpal embolus, retrolateral view (arrow point at blade – shaped projections). L detail from tip of palpal embolus, retrolateral view.

FIGURE 4. Medionops blades n. sp., A – I male from type locality (AMNH), J – L female from type locality (AMNH). A tarsus on left leg III, prolateral view. B tarsal claws on left leg III, dorsal oblique view. C tarsal organ on left leg III, dorsal view. D tarsal claws on left leg IV, prolateral view. E tarsus on left leg IV, prolateral view. F tarsal organ on left leg IV, dorsal view. G tarsal claws on left leg IV, retrolateral oblique view. H detail of unpaired claw of left leg IV, retrolateral oblique view. I trichobothrial base on left metatarsus IV, dorsal oblique view. J internal genitalia, dorsal view. K internal genitalia, anterior view. L internal genitalia, posterior view. Abbreviations: aj—adesmatic joint, ar—arolium, ap—anterior plate, dmr—distal margin of receptaculum, if—internal fold, mc—median concavity, re—receptaculum, pp—posterior plate, t—tracheal trunk, ue—uterus externus.

FIGURE 6. Medionops blades n. sp. A male holotype, habitus, dorsal view. B female paratype, habitus, dorsal view. C external genitalia of female paratype, ventral view. D left palp of male holotype, prolateral view. E left palp of male holotype, retrolateral view. Abbreviations: ap—anterior plate, ess—external sclerotization around spiracles, go—genital opening, ppposterior plate.

FIGURE 7. Medionops cesari (Dupérré) new comb., A – F Male from QCAZ, G – I Female from QCAZ. A left palp, prolateral view. B tibial brush on left palp, prolateral view. C cymbium, dorsal oblique view. D tip of embolus, ventral oblique view. E tip of embolus, prolateral view. F detail of chemosensory setae on cymbium, dorsal oblique view. G internal genitalia, dorsal view. H internal genitalia, posterior view. I internal genitalia, anterior view. Abbreviations: ap—anterior plate, dmr—distal margin of receptaculum, if—internal fold, mc—median concavity, re—receptaculum, pp—posterior plate, t—tracheal trunk, ue—uterus externus.

FIGURE 8. Medionops cesari (Dupérré) new comb. A male from QCAZ, habitus, dorsal view. B female from QCAZ, habitus, dorsal view. C external genitalia of female from QCAZ, ventral view. D left palp of male from QCAZ, prolateral view. E left palp of male from QCAZ, retrolateral view. Abbreviations: ap—anterior plate, ess—external sclerotization around spiracles, go—genital opening.

FIGURE 9. Medionops claudiae n. sp., A – C Male paratype (IBSP 19458), D – L Male from Caraíva, Brazil (IBSP 36569). A left palp, prolateral view. B tip of left embolus, posterior view. C same, prolateral view. D same, retrolateral view. E tarsal claws on left leg IV, prolateral view. F tarsal claws on left leg I, prolateral view. G setae on left tarsus I, prolateral apical view. H same, detail of setae, prolateral apical view. I same, detail of frictional setae, prolateral apical view. J metatarsus on left leg I, ventral view. K metatarsus on left leg I, ventral apical view. L join between metatarsus and tibia, ventral view. Abbreviation: CwS—claw slit sensilla, gl—gladius.

FIGURE 10. Medionops claudiae n. sp., male holotype (IBSP 17717). A habitus, dorsal view. B habitus, ventral view. C sternum and mouthparts, ventral view. D left palp, prolateral view. E left palp, retrolateral view.

FIGURE 11. Medionops murici n. sp., male (IBSP 85199). A tarsus on left leg I, retrolateral view. B tarsal claws on left leg I, retrolateral view. C join of tarsus and metatarsus on left leg I, ventral view. D detail of join of tarsus and metatarsus on left leg I, ventral view. E left leg II, retrolateral view. F join of tarsus and metatarsus on left leg II, ventral oblique view. G tarsal claws on left leg II, retrolateral view. H tarsal organ on left leg II, dorsal view. I tarsal organ on left leg IV, dorsal view. J tarsal claws on left leg IV, retrolateral view. K tarsal claws on left leg IV, dorsal view. L detail of tarsal claws on left leg IV, dorsal view.

FIGURE 14. Medionops murici n. sp., A male holotype, habitus, dorsal view. B female paratype, habitus, dorsal view. C external genitalia of female paratype, ventral view. D left palp of male paratype, prolateral view. E left palp of male paratype, retrolateral view. Abbreviations: ap—anterior plate, ess—external sclerotization around spiracles, go—genital opening.

FIGURE 15. Medionops ramirezi n. sp., male (MNRJ 6371). A left leg I, prolateral oblique view. B join of tarsus and metatarsus on left leg I, prolateral oblique view. C join of tarsus and metatarsus on left leg I, prolateral view. D metatarsus on left leg II, ventral oblique view. E join of tarsus and metatarsus on left leg II, ventral oblique view. F detail of the crista, ventral oblique view. Abbreviations: ca—crista, gl—gladius.

FIGURE 16. Medionops ramirezi n. sp., A – F Male (MNRJ 6371), left palp G – I Female paratype, internal genitalia (MACN). A prolateral view. B ventral view. C tibia, prolateral view. D tip of embolus, ventral view. E tip of embolus, retrolateral view. F tip of embolus, prolateral view. G dorsal view. H posterior view. I anterior view. Abbreviations: ap—anterior plate, dmr—distal margin of receptaculum, if—internal fold, pp—posterior plate, ue—uterus externus.

FIGURE 18. Medionops simla (Chickering) new comb. A male holotype, habitus, dorsal view. B female paratype, habitus, dorsal view. C external genitalia of female paratype, ventral view. D left palp of male holotype, prolateral view. E left palp of male holotype, retrolateral view. F female paratype internal genitalia, dorsal view. Abbreviations: ap—anterior plate, dmrdistal margin of receptaculum, ess—external sclerotization around spiracles, go—genital opening, if—internal fold, mcmedian concavity, re—receptaculum, pp—posterior plate, ue—uterus externus.

FIGURE 19. A – F Medionops simla (Chickering) new comb, left palp of male from Arima (AMNH). G – L Medionops tabay n. sp., left palp of male from La Montaña, Mérida (AMNH). A prolateral view. B tibial brush, prolateral view. C stridulatory pick at base of palpal femur, prolateral view. D tip of embolus, prolateral view. E tip of embolus, dorsal oblique view. F tip of embolus, dorsal view. G prolateral view. H ventral view. I detail of chemosensory setae path from cymbium, prolateral view. J tip of embolus, prolateral view. K tip of embolus, ventral view. L tibial brush, prolateral view.

FIGURE 21. Map of South America showing distribution of Medionops species. Triangle, Medionops blades n. sp.; plus sign, Medionops cesari (Dupérré) n. comb.; square, Medionops claudiae n. sp.; tears, Medionops murici n. sp.; diamond, Medionops ramirezi n. sp.; circles, Medionops simla (Chickering) n. comb.; heart, Medionops tabay n. sp.