Ologamasus delaliberai, Santos, Jandir C., Castilho, Raphael C., Silva, Edmilson S. & De Moraes, Gilberto J., 2015

Santos, Jandir C., Castilho, Raphael C., Silva, Edmilson S. & De Moraes, Gilberto J., 2015, Two new species of Ologamasus (Acari: Mesostigmata: Ologamasidae) from Brazil with a key to the world species of the genus, Zootaxa 4058 (2), pp. 267-277 : 272-274

Ologamasus delaliberai n. sp.

Material examined. Holotype female and two paratype females from litter at the base of Tapirira guianensis Aublet. (Anacardiaceae) at Teotônio Vilela (9°56'19"S and 36° 22'17" W), State of Alagoas, Brazil, August 14, 2012. All types collected by J.C. Santos and deposited at Departamento de Entomologia e Acarologia, Escola Superior de Agricultura “Luiz de Queiroz” ( ESALQ), Universidade de São Paulo ( USP), Piracicaba, State of São Paulo, Brazil.

Adult female ( Figs 13–19 ) (Three specimens measured)

Gnathosoma. Fixed cheliceral digit 90 (87–92) long, with ten teeth in addition to apical tooth and a setiform pilus dentilis ( Fig. 13 ); movable digit 87 (83–90) long, with three teeth in addition to apical tooth; antiaxial and dorsal lyrifissures as well as dorsal seta distinct. Arthrodial process of chelicera a short coronet-like fringe. Number of setae on palp (trochanter to tarsus): 2-5-6-14 -15; apotele 3-tined; setae aciculate and smooth, except al 1 of palp genu, rayed ( Fig. 14 ). Epistome with an anteromedian extension acuminate and with one to three pairs of lateral denticles ( Fig. 15 ). Deutosternum delimited by lateral lines; with eight transverse lines; most distal line smooth and each of the other lines with 6–8 denticles; first and eighth lines with 6–12 additional denticles laterad of each lateral deutosternal line; a pair of denticulate lines outside of the lateral deutosternal line behind eighth line of deutosternal denticles ( Fig. 16 ). Internal malae separated from each other and with external margin fimbriate. Corniculus hornlike, about twice as long as its basal width. Seta h 3 about in longitudinal line with h 1 and mesad and slightly anterior to h 2. Measurements of setae: h 1 53–55, h 2 40, h 3 30, sc 35; all aciculate and smooth.

Dorsal idiosoma ( Fig. 17 ). Idiosoma 560 (535–575) long and 363 (340–375) wide at widest point. Podonotal and opisthonotal shields fused, completely covering idiosoma and extending ventrolaterally, imbricate, and with tiny shallow pits posterior to j 6. Podonotal region with 20 pairs of setae (s 1, s 2, s 4 and r 1 absent) and five pairs of distinguishable lyrifissures. Opisthonotal region with 19 pairs of setae (R 1 absent) and three pairs of distinguishable lyrifissures. Measurements of setae: j 1 39 (38–40), j 2 47 (45–50), j 3 49 (45–53), j 4 56 (55–57), j 5 42, j 6 50, z 1 14 (13–15), z 2 9 (8–10), z 3 36 (35–38), z 4 62 (62–63), z 5 52, z 6 50, s 3 37 (37–38), s 5 61 (61–62), s 6 65 (63–67), r 2 25 (24–25), r 3 58 (55–60), r 4 15 (13–17), r 5 32 (30–33), r 6 65 (63–67), J 150, J 2 broken, J 3 broken, J 4 67, J 5 63 (62–65), Z 1 62, Z 2 67, Z 3 77, Z 4 75, Z 5 60, S 1 69 (68–71), S 2 75, S 3 73 (71–75), S 4 76 (75–77), S 5 77 (75–80), R 2 75, R 3 65, R 4 78, R 5 67; all aciculate and smooth.

Ventral idiosoma ( Fig. 18 ) Base of tritosternum 32 (32–33) long and 21 (20–22) wide proximally ( Fig. 19 ); laciniae 70 long, totally separated and pilose; inserted between a pair of reticulate presternal platelets. Sternal shield imbricate, with tiny shallow pits in the central region, 103 (100–105) long at mid-line and 160 (165–175) wide between coxae II and III, posterior margin slightly concave, with four pairs of setae and four pairs of lyrifissures. Endopodal plate incorporated into the sternal shield, except region between the coxae III and IV, which is represented by an elongate plate. Genital shield striate laterally, smooth elsewhere; about as long as wide; posterior margin truncate, in line with the posterior margin of coxae IV; distance between st 5 102 (100–107). Ventrianal shield imbricate, with tiny shallow pits; 254 (243–262) long at mid-line and 266 (262–275) wide at widest level, fused posterolaterally with dorsal shield; with eight pairs of setae (Jv 1– Jv 5 and Zv 1– Zv 3) in addition to circumanal setae; with four pairs of lyrifissures and one pair of pores distinguishable, including iv 5. Unsclerotised strip of integument separating dorsal from ventrianal shield ending between Z v2 and Z v3. Peritreme extending anteriorly to median region of coxa I (level of seta z 2). Peritrematic plate fused anteriorly with dorsal shield and posteriorly with exopodal plate near coxa IV; with two lyrifissures and a pore posterior to stigma. Exopodal plate distinguishable as subtriangular fragment between coxae I and II, an elongate fragment between coxae II and III, and a sub-trapezoidal fragment between coxae III and IV, barely connected to peritrematic plate posterorly. Metapodal platelet indistinct. Measurements of setae: st 1 37 (37–38), st 2 44 (43–45), st 3 38 (37–40), st 4 31 (30–32), st 5 42 (40–45), Jv 1 42 (40–47), Jv 2 43 (42–45), Jv 3 42, Jv 4 50, Jv 5 67 (67–68), Zv 1 38 (37–40), Zv 2 50, Zv 3 50 (49-50), para–anal 43 (42–45), post–anal 45 (45–46); all setae aciculate and smooth.

Spermathecal apparatus: indistinguishable.

Legs. Lengths: I: 575, II: 425, III: 400, IV: 500. Chaetotaxy: I: coxa 0 0/2, 0/0 0, trochanter 1 0/1, 1/2 1, femur 2 5/4 2, genu 2 3/2, 3/1 2, tibia 2 3/2, 3/2 2; II: coxa 0 0/1, 0/1 0, trochanter 1 0/3 1, femur 2 3/1,2/2 1, genu 2 3/1, 2/1 2, tibia 2 2/1, 2/1 2; III: coxa 0 0/1, 0/1 0, trochanter 1 1/1, 0/2 1, femur 1 2/1, 2/0 0, genu 2 2/1, 2/1 1, tibia 2 1/ 1, 2/1 1; IV: coxa 0 0/1, 0/0 0, trochanter 1 1/2, 0/1 0, femur 2 1/0, 1/0 2, genu 2 2/1, 2/1 2, tibia 2 1/1, 3/1 2; tarsi II IV: 18 setae each. Setae aciculate and smooth. All legs with pretarsi; median section of pulvilli of legs I–IV rounded, with an elongate ambulacral stalk and a pair of prominent claws; pretarsus I about half as long as other pretarsi.

Adult male. Unknown.

Etymology. The name delaliberai is used in honor of Italo Delalibera Jr., eminent acarologist and pathologist of Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo.

Figures

FIGURES 13 – 19. Ologamasus delaliberai n. sp. Female. 13. Lateral (antiaxial) view of chelicera; 14. Palp trochanter; 15. Epistome; 16. Hypostome; 17. Dorsal idiosoma. 18. Ventral Idiosoma; 19. Tritosternum. Lyrifissures enlarged for improved visibility.