Gamasiphis edmilsoni, Castilho & Narita & de Moraes, 2012

Castilho, Raphael C., Narita, João Paulo Z. & de Moraes, Gilberto J., 2012, Three new species of Gamasiphis (Acari: Mesostigmata: Ologamasidae) from Brazil, with complementary information about Gamasiphis plenosetosus Karg and a key to the world species of the genus, Journal of Natural History 46 (31 - 32), pp. 1969-1998 : 1981-1985

Gamasiphis edmilsoni sp. nov.

Diagnosis of adults

Anteromedial extension of epistome lanceolate and serrate; all idiosomal setae aciculate; seta j2 about as long as distance between its base and base of j3; seta j3 about 0.8 times as long as distance between its base and base of j4; five pairs of J setae; seta J2 as long as distance between its base and base of J3; seta J4 about 0.5 times as long as distance between its base and base of J5; seta Z4 slightly mediad to Z5 and about 1.3 times as long as distance between its base and base of Z5; two pairs of presternal shields; sternal shield with four pairs of lyrifissures; seta Zv1 about 1.3 times as long as Jv1; seta Zv2 as long as distance between its base and base of Zv3.

Adult female ( Figure 5A–F )

Fve specimens measured. All setae aciculate.

Gnathosoma . Fixed cheliceral digit 45 (44–47) long, with six teeth in addition to apical tooth and a setiform pilus dentilis ( Figure 5A ); movable cheliceral digit 44 (42–45) long, with three teeth in addition to apical tooth. Antiaxial lyrifissure and dorsal cheliceral seta distinct. Anteromedial extension of epistome lanceolate and serrate; anterolateral extensions smooth, aciculate and shorter than anteromedial extension ( Figure 5B ). Margins of deutosternum not distinct; deutosternal denticles in eight rows, with 8–15 denticles each ( Figure 5C ); anteriormost row shaped as an inverted “V” while subsequent rows roughly transverse. Seta h3 directly posterior to h1 and slightly anterior and mediad to h2. Measurements of setae: h1 14 (13–15), h2 11 (11–12), h3 14 (13–14), sc 13 (13–14).

Dorsal idiosoma ( Figure 5D ). Idiosoma 401 (396–406) long and 273 (263–284) wide at widest point. Podonotal region reticulate posterolaterally and immediately behind j6, smooth elsewhere; with 23 pairs of setae (r1 absent) and 10 pairs of distinguishable lyrifissures; seta j2 about as long as distance between its base and base of j3; seta j3 about 0.8 times as long as distance between its base and base of j4. Opisthonotal region imbricate; with 18 pairs of setae (S5 and R5 absent), 13 pairs of distinguishable lyrifissures and one pair of pores, the latter slightly posterior and mediad to Z1; seta J2 as long as distance between its base and base of J3; seta J4 about 0.5 times as long as distance between its base and base of J5; seta Z4 slightly mediad to Z5 and about 1.3 times as long as distance between its base and base of Z5. Measurements of setae: j1 11 (10–11), j2 27 (26–27), j3 26 (25–27), j4 27 (26–29), j5 26 (25–28), j6 26 (25–27), z1 8 (7–8), z2 24 (23–25), z3 29 (27–30), z4 30 (30–31), z5 29 (27–30), z6 32 (32–33), s1 22 (21–22), s2 22 (18–25), s3 26 (26–27), s4 30 (29–32), s5 32 (31–33), s6 35 (34–36), r2 25 (23–26), r3 22 (20–23), r4 31 (30–32), r5 15 (13–16), r6 34 (32–35), J1 29 (28–30), J2 35 (34–37), J3 35 (34–36), J4 26 (25–27), J5 21 (20–22), Z1 36 (34–37), Z2 37 (35–38), Z3 38 (37–40), Z4 30 (28–32), Z5 46 (45–46), S1 35 (35–36), S2 36 (35–38), S3 32 (32–33), S4 29 (28–30), R1 35 (33–37), R2 37 (36–37), R3 37 (36–38), R4 37 (36–38).

Ventral idiosoma ( Figure 5E ). Base of tritosternum 21 (20–21) long and 14 (13–15) wide proximally ( Figure 5F ); laciniae 63 (59–66), separated for about 90% of their total length, pilose. With two pairs of presternal shields. Sternal shield reticulate between st1 and st2, smooth posteriorly; approximately 75 (71–79) long at mid-line and 115 (112–119) wide between tips of endopodal projections between coxae II and III; with four pairs of setae, st3 inserted well posterior and mediad to st2, and four pairs of lyrifissures. Genital shield mostly smooth, with a single curved line delimiting each posterior corner; sclerotized section shorter than width along straight posterior margin, which is about in line with posterior margin of coxa IV; distance between st5–st5 34 (32–37). Ventrianal shield reticulate anteriorly to Zv3 and smooth posteriorly; 182 (178–186) long at mid-line (from anterior margin to postanal seta), 172 (169–174) wide at widest point; with eight pairs of setae (Jv1–Jv5, Zv1–Zv3) in addition to circumanal setae and three pairs of lyrifissures; seta Zv2 as long as distance between its base and base of Zv3; anal region of the shield partially separated from ventral region by an unsclerotized line (except for area between Jv3 and slightly laterad to it) that runs diagonally to dorsum of idiosoma, reaching region next and posterior to Z1; seta Jv5 about in level with anterior margin of anal opening and about 2.5–3 times as long as para-anal seta; postanal seta about 1.5 times as long as para-anal seta. A narrow band of dorsal shield extending laterad and up to the posterior end of the fused peritrematic–exopodal shield. With a wide diagonal section of sclerotized cuticle laterad to ventrianal shield and connecting it to the dorsal shield. Peritreme extending anteriorly almost to anterior margin of coxa II. Measurements of setae: st1 19 (18–21), st2 15 (14–16), st3 11 (10–11), st4 17 (16–17), st5 15 (14–15), Jv1 19 (19–20), Jv2 21 (21–22), Jv3 26 (25–26), Jv4 36 (35–37), Jv5 27 (26–27), Zv1 26 (26–27), Zv2 31 (30–33), Zv3 35 (35–37), para-anal 10 (10–11), postanal 15 (14–15).

Legs. Lengths: I: 329 (326–332); II: 253 (249–261); III: 223 (215–229); IV: 287 (277–293). Numbers of setae on segments 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. All legs with pretarsi, each with three rounded pulvillar lobes, elongate ambulacral stalk and a pair of strongly sclerotized claws.

Adult male ( Figure 6A–C )

Two specimens measured. Shape of setae as in adult female, except two ventral setae on femur II, one ventral seta on genu II and one ventral seta on tibia II, spur-like ( Figure 6A ).

Gnathosoma . Fixed cheliceral digit 38–42 long, with five teeth in addition to apical tooth and a setiform pilus dentilis ( Figure 6B ). Movable cheliceral digit 37–41 long, with one tooth in addition to apical tooth. Antiaxial lyrifissure not distinct, but dorsal cheliceral seta distinct. Spermatodactyl 44–50 long, c-chaped, apparently with an internal canal in proximal half and with distal half spatulated. Epistome, deutosternum and position of hypostomal setae as in adult female. Measurements of setae: h1 17, h2 14, h3 16, sc 16–17.

Dorsal idiosoma. Idiosoma 374–376 long and 257–284 wide at widest point; dorsal shield similar to that of adult female. Measurements of setae: j1 10–11, j2 27, j3 26–28, j4 28–29, j5 23–24, j6 23–25, z1 6–7, z2 26–27, z3 27, z4 27–29, z5 25, z6 29–30, s1 21 –22, s2 22 –23, s3 25 –26, s4 27 –30, s5 28 –31, s6 29 –32, r2 23–24, r3 19–21, r4 31–33, r5 12–13, r6 31–32, J1 26–27, J2 30–31, J3 30–31, J4 26–27, J5 18–19, Z1 31–32, Z2 32, Z3 29–31, Z4 22–23, S1 32, S2 32 –33, S3 30 –31, S4 24 –25, R2 31–32, R3 34–35, R4 35–36, R5 34–36.

Ventral idiosoma ( Figure 6C ). Base of tritosternum 16–18 long and 12–13 wide proximally, laciniae 46–51 long, other characteristics as in adult female. Except for the fusion of sternal and genital shields (sternogenital shield), shape, pattern and fusions of ventral shields as in adult female. With two pairs of presternal shields. Sternogenital shield reticulate between st1 and st2 and with imbricated patches posteriorly to st2; 123–125 long and 114–116 between tips of endopodal projections between coxae II and III; posterior margin slightly concave; with five pairs of setae and four pairs of lyrifissures; genital opening on anterior margin of shield. Ventrianal shield 169–172 long (from anterior margin to postanal seta) and 159–167 wide at widest point; with eight pairs of setae (Jv1–Jv5, Zv1–Zv3) in addition to circumanal setae and three pairs of lyrifissures; seta Jv5 about in level with anterior margin of anal opening and about 2.5 times as long as para-anal seta; postanal seta 1.3 times as long as para-anal seta. Peritreme similar to adult female. Measurements of setae: st1 20–21, st2 19, st3 14–15, st4 14–15, st5 15–16, Jv1 22–23, Jv2 24–25, Jv3 24, Jv4 32–33, Jv5 25–26, Zv1 26, Zv2 31–33, Zv3 31–32, para-anal 10–11, postanal 13.

Legs. Lengths: I: 331–336; II: 246–273; III: 207–217; IV: 279–291. Numbers of setae of legs similar to adult female. All legs with pretarsi similar to those of adult female.

Material examined

All specimens collected by J.P.Z. Narita from soil and litter of a garden by “Salvador de Toledo Piza Junior” building, campus of Escola Superior de Agricultura “Luiz de Queiroz” (ESALQ), Universidade de São Paulo (USP), Piracicaba, State of São Paulo, Brazil (22 ◦ 42 ′ 30 ′′ S, 47 ◦ 38 ′ 00 ′′ W). Adult female holotype, two adult female paratypes and one adult male paratype collected on 4 April 2010; one adult female paratype collected on 1 June 2009; one adult female paratype collected on 8 July 2009; one adult male paratype collected on 16 November 2009. All types deposited at Departamento de Entomologia e Acarologia, ESALQ / USP .

Etymology

The name edmilsoni is an honour of Professor Edmilson Santos Silva of Universidade Federal de Alagoas, Brazil, for all his help during the Master’s degree of the firstnamed author of this paper.

Remarks

Gamasiphis edmilsoni sp. nov. is most similar to G. plenosetosus , but the latter has seta j4 about 0.6 times as long as distance between its base and base of j5; seta J2 about 1.8 times as long as distance between its base and base of J3; seta J4 as long as distance between its base and base of J5; seta Z4 slightly laterad to Z5 and seta Z4 about as long as distance between its base and base of Z5. Gamasiphis denticus Hafez and Nasr, 1979 differs from the new species here described by having 22 pairs of setae on the podonotal region (s1 and r1 absent); seta j3 about 1.4 times as long as distance between its base and base of j4; 19 pairs of setae on the opisthonotal region (R5 absent) and seta Zv2 about 0.7 times as long as distance between its base and base of Zv3. Gamasiphis furcatus Karg, 1990 differs from the new species here described by having anteromedial extension of epistome spatulate; 22 pairs of setae on the podonotal region (s1 and r1 absent); seta j2 about 0.4 times as long as distance between its base and base of j3; 19 pairs of setae on the opisthonotal region (R5 absent) and seta Zv2 about 0.8 times as long as distance between its base and base of Zv3. This new species is also similar to Gamasiphis trituberosus Karg, 1990 , but the latter has dorsal shield totally imbricate; 21 pairs of setae on the podonotal region (s1, r1 and r2 absent); seta j2 about 0.6 times as long as distance between its base and base of j3; 17 pairs of setae on the opisthonotal region (S5, R3 and R5 absent); seta Zv1 about 0.7 times as long as Jv1 and seta Zv2 about 0.7 times as long as distance between its base and base of Zv3.

Figures

Figure 5. Gamasiphis edmilsoni sp. nov., female: (A) lateral (antiaxial) view of chelicera; (B) epistome; (C) hypostome; (D) dorsal idiosoma; (E) ventral idiosoma; (F) tritosternum. Lyrifissures and pores enlarged for improved visibility.

Figure 6. Gamasiphis edmilsoni sp. nov., male: (A) anterolateral view of femur, genu and tibia of leg II; (B) lateral (antiaxial) view of chelicera; (C) ventral idiosoma. Lyrifissures enlarged for improved visibility.