Gamasiphis plenosetosus Karg, 1994

Melo-Molina, Elsa L., Santos, Jandir C., De Moraes, Gilberto J. & Castilho, Raphael C., 2021, Gamasiphis species (Acari: Mesostigmata: Ologamasidae) from Ecuador, with description of a new species and new records, Zootaxa 5068 (3), pp. 410-418 : 413-416

Gamasiphis plenosetosus Karg, 1994

Gamasiphis plenosetosus Karg 1994b: 210 .

Gamasiphis plenosetosus . — Castilho et al. 2012b: 1985 .

Material examined. ECUADOR: Napo (Amazon region): one female, between Santa Rosa de Quijos and El Chaco (0°19’31.9”S 77°47’36.7”W; 1531 m), from soil at the base of Solanum quitoense on 4 August 2019; one female, Tena (0°53’49.4”S 77°48’06.5”W; 608 m) from soil at the base of Saccharum officinarum on 4 August 2019; ECUADOR: Orellana (Amazon region): one female, Joya de los Sachas (0°19’36.7”S 76°53’17.9”W; 278 m) from soil at the base of Urera baccifera on 26 February 2018; one female. Joya de los Sachas (0°19’36.7”S 76°53’17.5”W; 274 m) from soil at the base of Coix lacryma -jobi on 26 February 2018; ECUADOR: Sucumbios (Amazon region): one female, Nueva Loja ( East ) (0°06’02.7”S 76°52’14.8”W; 300 m) from soil at the base of Musa paradisiaca on 21 February 2018 ; one female, Nueva Loja ( East ) (0°06’03.1”S 76°52’14.1”W; 294 m) from soil at the base of Citrus limon on 21 February 2018 ; three females, Joya de los Sachas (0°19’36.8”S 76°53’17.8”W; 284 m) from soil at the base of Mangifera indica on 26 February 2018 ; one female, Alma Ecuatoriana (0°00’32.6”S 77°28’20.3”W; 1187 m) from soil at the base of Rubus rosifolius on 21 February 2018 ; two females, Nueva Loja ( East ) (0°06’03.1”S 76°52’14.2”W; 309 m) from soil at the base of Sapindus saponaria on 21 February 2018 ; two females Nueva Loja ( East ) (0°06’02.9”S 76°52’14.6”W; 312 m) from soil at the base of Ficus americana on 21 February 2018 ; one female, Nueva Loja ( East ) (0°06’02.9”S 76°52’14.5”W; 298 m) from litter at the base of Siphocampylus sp. on 21 February 2018 . All specimens collected by C.A. Ortega-Ojeda.

Supplementary description.

Adult female (n = 15) ( Figs 9–16 ).

Gnathosoma. Fixed cheliceral digit 42 (39–47) long, with six teeth in addition to the apical hook and the aciculate pilus dentilis ( Fig. 9 ); movable cheliceral digit 44 (43–47) long, with four teeth in addition to apical hook; chelicera with antiaxial and dorsal lyrifissures as well as dorsal seta distinct; arthrodial process of chelicera shaped as a short coronet-shaped fringe. Palp apotele 3-tined. Epistome 3-tined, with anteromedial extension club-shaped and denticulate ( Fig. 10 ); anterolateral extensions smooth, aciculate, shorter than anteromedial extension and smooth. Deutosternum with indistinct margins, apparently with seven transverse lines ( Fig. 11 ); first to fourth lines each with 5–6 denticles, fifth and sixth lines multidenticulate; fourth to sixth transverse lines U-shaped. Internal malae with fringed lateral margins. Corniculi horn-shaped, 22 (21–23) long, 14 (13–14) wide at the widest point. Seta h3 posterolateral to h1 and anteromedial to h2. Measurements of setae: h1 and h2 13 (12–14), h3 14 (13–16), sc 15 (13–18); all setae aciculate.

Dorsal idiosoma ( Fig. 12 ). Dorsal shield 385 (335–403) long, 240 (226–260) wide (between s6 and r6), covering totally the idiosoma. Podonotal region imbricate posterolaterally to z4, smooth elsewhere; with 23 pairs of setae (r1 absent); r 5 in a more ventral position than other r setae; with five pairs of distinguishable lyrifissures and four pairs of distinguishable pores. Opisthonotal region imbricate; with 18 pairs of setae ( R1 and R5 absent); with eight pairs of distinguishable lyrifissures and one pair of distinguishable pores; with a slightly curved line extending diagonally from shield margin through level between S2 and R2 toward base of Z1. Measurements of setae: j1 11 (10–12), j2 30 (28–32), j3 27 (26–31), j4 27 (26–29), j5 27 (25–30), j6 31 (28–33), z1 7 (6–10), z2 25 (23–27), z3 29 (23–32), z4 29 (26–32), z5 28 (25–31), z6 31 (26–36), s1 24 (23–25), s2 26 (24–27), s3 31 (26–34), s4 34 (30–36), s5 35 (31–36), s6 36 (31–38), r2 27 (25–29), r3 24 (21–27), r4 25 (21–27), r5 14 (12–15), r6 33 (30–36), J1 28 (23–35), J2 33 (31–36), J3 34 (32–38), J4 30 (26–35), J5 20 (15–23), Z1 35 (31–39), Z2 37 (34–40), Z3 37 (31–42), Z4 28 (25–31), Z5 47 (43–52), S1 36 (30–40), S2 37 (35–42), S3 36 (34–37), S4 31 (29–34), S5 31 (29–35), R2 38 (35–40), R3 38 (36–40), R4 39 (36–42); all setae aciculate.

Ventral idiosoma ( Fig. 13 ). Base of tritosternum 26 long and 14 (12–16) wide basally ( Fig. 14 ); laciniae 41 (39–44) long, pilose, separated for about 90% of their total length. With two pairs of presternal platelets. Sternal shield with scant reticulation; 90 (88–91) long at midline and 63 (57–68) wide at median level of coxae II; with four pairs of setae (st1–st4), st3 inserted posterior and medial to st2; and four pairs of distinguishable lyrifissures. Genital shield apparently smooth; 64 (60–68) long and 58 (55–62) wide at widest level; bearing st 5, distance st5–st5 36 (34–39); anterior margin convex and posterior margin truncate. Ventrianal shield imbricate anteriorly to Jv4 and smooth posteriorly; 189 (159–203) long at midline (from anterior margin to post-anal seta), 186 (174–203) wide at widest point (between setae Jv2 and Zv2); with eight pairs of setae (Jv1–Jv5, Zv1–Zv3) in addition to circumanal setae, and three pairs of distinguishable lyrifissures. Peritreme extending to level of median region of coxa II. Measurements of setae: st1 20 (18–22), st2 17 (16–19), st3 10 (8–11), st4 17 (16–19), st5 16 (15–18), Jv1 21 (20–23), Jv2 25 (23–26), Jv3 28 (25–34), Jv4 37 (34–40), Jv5 29 (27–33), Zv1 33 (30–39), Zv2 37 (34–39), Zv3 38 (36–39), para-anal 11 (10–12), post-anal 12 (10–14); all setae aciculate.

Spermatheca ( Fig. 15 ). Phytoseiid-type, clearly distinguishable as an elongate and curved sclerotised structure, projecting from the posterior internal margin of the base of coxa IV, continuing in a long, membranous saccular structure.

Legs. I: 329 (309–348); II: 251 (221–268); III: 214 (200–234); IV: 281 (273–286). Chaetotaxy of legs I–IV: coxa: 2, 2, 2, 1; trochanter: 6, 5, 5, 5; femur: 13, 11, 6, 6; genu: 13, 11, 9, 8; tibia: 14, 10, 8, 9; tarsus II–IV: 18, 18, 17. Without macrosetae on all legs, including leg IV ( Fig. 16 ). All legs with pretarsi, elongate ambulacral stalk and a pair of strongly sclerotised claws.

Remarks. The redescription of this species provided by Castilho et al. (2012b) added to the original description, which did not provide sufficient morphological details. However, many setae of the holotype are broken, and thus their measurements could not be provided in the redescription by Castilho et al. (2012b). The measurements of this publication are similar to those reported by their redescription for the available setae in the holotype. Castilho et al. (2012b) reported the presence of three teeth on the movable cheliceral digit, and the absence of S5 and presence of R 1 in the redescription of the species based on their examination of the holotype. Also, information about the spermatheca could not be provided by Castilho et al. (2012b), and it is here provided for the first time.

Figures

FIGURES 9–16. Gamasiphis plenosetosus Karg, 1994, adult female. 9. Lateral (antiaxial) view of chelicera; 10. Epistome; 11. Hypostome; 12. Dorsal idiosoma; 13. Ventral idiosoma; 14. Tritosternum; 15. Spermatheca; 16. Leg IV. Lyrifissures and pores enlarged for improved visibility.