Gaeolaelaps lenis Vatankhah & Nemati,

Vatankhah, Farzaneh, Nemati, Alireza, Esfandiari, Mehdi & Shishehbor, Parviz, 2016, Description of a new species of Gaeolaelaps (Acari: Laelapidae) from Iran, with a key to world species of the genus with short peritremes, Zootaxa 4121 (5), pp. 566-574: 567-571

publication ID

http://doi.org/10.11646/zootaxa.4121.5.6

publication LSID

lsid:zoobank.org:pub:C5179C12-2B14-4224-9C3D-F703EA342698

persistent identifier

http://treatment.plazi.org/id/E648175A-FFAE-FFC1-E8BB-FE04FD08CF6B

treatment provided by

Plazi

scientific name

Gaeolaelaps lenis Vatankhah & Nemati
status

sp. nov.

Gaeolaelaps lenis Vatankhah & Nemati  sp. nov.

Figures 1–10View FIGURES 1 – 2View FIGURES 3 – 6View FIGURES 7 – 10.

Specimens examined and type deposition. Holotype female, Shahrekord, Chaharmahal va Bakhtiari province, nest of Formica  sp. ( Formicidae  ), coll. F. Vatankhah, 2014. Paratypes: five females, same data as holotype. The holotype and three of the paratypes are deposited in the Acarological Laboratory, Department of Plant Protection, Agricultural College, Shahrekord University, Shahrekord, Iran ( APAS). Two female paratypes are deposited in the Plant Protection Department, Agricultural College, Shahid Chamran University, Ahvaz, Iran, and Senckenberg Museum für Naturkunde Görlitz Am Museum, Görlitz, Germany.

Diagnosis (Adult female). Dorsal shield with nearly parallel lateral margins and distinct reticulation posterior to J 1, with 38 pairs of simple acicular setae, z 3 absent; sternal and epigynal shields smooth; peritremes short, extending to the middle-level of coxae II; tarsus of leg IV (125–134 long) with elongate setae: ad 2–3 (0.41–0.43 and 0.44–0.48 × the length of tarsus IV respectively) and pd 2–3 (0.63–0.70 × the length of tarsus IV).

Description. Adult female (Four specimens measured)

Dorsal idiosoma. Idiosoma oval-shaped, 566–571 long, 312–334 wide (at level of setae r 3), lateral margins of dorsal shield almost parallel, shield not covering whole idiosoma ( Fig. 1View FIGURES 1 – 2), 526–564 long from its anteromedian edge anterior to bases of setae j 1 to its posteromedian edge posterior to bases of setae Z 5, 240– 247 wide at level of setae r 2 –r 3 (widest part), podonotal part smooth, reticulation more distinct posterior to setae J 1, shield with 38 pairs of thin, simple acicular setae, 21 pairs on podonotal region (j 1–6; z 1, z 2, z 4–6; s 1–6; r 2–5; z 3 absent) and 17 pairs on opisthonotal part (J 1–5; Z 1–5; S 1–5) including PX 2–3 between J and Z series. Unsclerotised cuticle laterad of podonotal region with a smooth sub-triangular accessory shield ( Fig. 1View FIGURES 1 – 2). Dorsal setae mostly short, length varies, not reaching to base of following in series, j 1, z 1, j 2 and s 1 18 –26, other dorsal setae 30–36, Z 5 longest 48– 50. Setae J 4 located far from J 5, distance of J 4 –J 5 62–65. Unsclerotised cuticle laterad of podonotal part with r 6 (18) (between s 6 and Z 1) and laterad of opisthonotal with R 6 (between S 4 and S 5). Podonotal and opisthonotal regions with 19 pairs of pore-like structures, as shown in Figure 1View FIGURES 1 – 2.

Ventral idiosoma ( Fig. 2View FIGURES 1 – 2). Base of tritosternum with 29–36 long, 12–14 wide, pilose laciniae free for 82–84 and fused basally for 7–12. Pre-endopodal area granulated, with a pair of distinct sclerotised pre-sternal plates. Sternal shield 144–146 long (along midline from anterior edge to its posterior margin), 151–165 wide (at level of projection between coxae II-III) and 11 5–120 at level of st 2, smooth except for very thin striae adjacent to lateral margins, anterior margin not clearly defined, posterior margin irregular. Sternal setae smooth, st 1 –st 3 (36–41), distance between st 1 –st 1 (72–82), st 2 –st 2 (94–108) and st 3 –st 3 (101–108); iv 1 slit-like, located slightly behind st 1, iv 2 pore-like, between st 2 –st 3. Setae st 4 (26–31) and pore-like iv 3 located on integument behind posterior margin of sternal shield. Smooth tongue-shaped epigynal shield 178–192 long at midline, 72–74 wide at epigynal setae, ratio of length to width (L/W) 2.47–2.59, with one pair of simple acicular setae (st 5 = 26–29). Paragenital pores (iv 5) on soft integument between epigynal seta and coxa IV. Anal shield subtriangular, reticulated, 91–96 long (at midline from the anterior margin to the posterior edge of the cribrum), 82–84 wide (at widest point), post anal seta (38–41) longer than para-anal setae (26). Cribrum extending posterolaterally slightly above post-anal seta insertion. Opisthogastric surface with one pair of narrow and slightly elongate paragenital platelets, one pair of suboval metapodal plates (24–26 × 10–12), two pairs of minute platelets between st 5 and Zv 1 setae, seven pairs of smooth acicular setae, Zv 1 (26–29), Zv 2 (34–36), Jv 1 (26–31), Jv 2 (36), Jv 3–4 (31–34) long, Jv 5 longest (40–48), and five pairs of pore-like structures, plus para-anal gland pores gv 3 on lateral margins of anal shield at level of anterior edge of anal opening. Stigma located at anterior level of coxa IV. Peritremes narrow and short, extending anteriorly to anterior part of seta r 2 (slightly above the mid-level of coxa II), peritrematal plate fused with posterior point of sub-triangular accessory shield, widest opposite coxae II –III, with one glandular poroid gp and one lyrifissure ip ( Figs 1, 2View FIGURES 1 – 2), separated from exopodal shield. Post-stigmatic plate small, extending to mid-level of coxa IV, with three pore-like structures. Narrow crescent-shaped and small sub-triangular exopodal plates observed adjacent to exterior part of coxae IV and between coxae II-III respectively. Endopodal plates II/III incorporated to lateral margins of sternal shield, III –IV strip like, angular and in contact with fragmented narrow parapodal platelets located at interior side of coxae IV.

Gnathosoma  . Epistome denticulate, with a bifid medioventral process projecting beyond the anterior margin, with minute teeth between two apical spikes ( Fig. 3View FIGURES 3 – 6). Hypostome ( Fig. 4View FIGURES 3 – 6) with 3 pairs of smooth simple acicular setae; h 1 (24–29), h 2 (19–26) and h 3 (29–36). Palpcoxal setae 22–24 long. Deutosternal groove with six rows of denticles: 9, 11, 9, 11, 8 and 7 (from anterior to posterior rows respectively). Corniculi horn-like, internal malae with median barbed extensions longer than smooth lateral lobes. Chelicera with lateral lyrifissure and arthrodial brush, moveable digit (50–60) with two teeth; middle article (82–86) ending in fixed digit (53–62) with five teeth in addition to terminal tooth ( Fig. 5View FIGURES 3 – 6). Palp chaetotaxy normal (sensu Evans & Till, 1965), with simple setae except al 1 and al 2 of genu slightly thickened, al 1 with tip rounded and al 2 spine-like; palp tarsal claw two-tined ( Fig. 6View FIGURES 3 – 6). Lengths of palp segments: trochanter 48, femur 48–50, genu 38–41, tibia 36–38, tarsus 22–24.

Legs. Tarsi I –IV with claws and ambulacra. Leg I 516–528, coxa 79–84, trochanter 34–36, basifemur 22–24, telofemur 82–84, genu 72, tibia 77–84, basitarsus 12–14, telotarsus: 132–134; Leg II 355–374, coxa 46–55, trochanter 46–48, basifemur 14–21, telofemur 48–50, genu 55–60, tibia 50–60, basitarsus 19–22, telotarsus 70–72; Leg III 305–334, coxa 41–48, trochanter 36–46, basifemur 14–22, telofemur 46–48, genu 43, tibia 43–46, basitarsus 19–22, telotarsus 55–65; Leg IV 487–523, coxa 36–55, trochanter 77–84, basifemur 17–24, telofemur 84, genu 70–77, tibia 72, basitarsus 29–34, telotarsus 96–101. Legs I and IV longer than legs II and III.

Leg chaetotaxy ( Figs 7–10View FIGURES 7 – 10): Chaetotaxy of all leg segments normal for Gaeolaelaps  (sensu Faraji & Halliday, 2009). Leg I ( Fig. 7View FIGURES 7 – 10): coxa 0 0/ 1 0/ 1 0; trochanter 1 0/ 2 1 / 1 1; femur 2 2 / 1 3 / 3 2; genu 2 3 / 2 3 / 1 2; tibia 2 3 / 2 3 / 1 2. Leg II ( Fig. 8View FIGURES 7 – 10): coxa 0 0/ 1 0/ 1 0; trochanter 1 0/ 2 0/ 1 1; femur 2 3 / 1 2 / 2 1 (av slightly thicker than other setae on the segment); genu 2 3 / 1 2 / 1 2; tibia 2 2 / 1 2 / 1 2 (av and pv slightly thicker than other setae on the segment); tarsus 3 3 / 2 3 / 2 3 + mv, md (pl 1, al 1, pv 1–2, av 1–2, md and mv slightly thicker than other setae on the segment). Leg III ( Fig. 9View FIGURES 7 – 10): coxa 0 0/ 1 0/ 1 0; trochanter 1 0/ 2 0/ 1 1; femur 1 2 / 1 1 /0 1; genu 2 2 / 1 2 / 1 1; tibia 2 1 / 1 2 / 1 1; tarsus 3 3 / 2 3 / 2 3 + mv, md (the thickness of setae similar to those on tarsus II). Leg IV ( Fig. 10View FIGURES 7 – 10): coxa 0 0/ 1 0/0 0; trochanter 1 0/ 2 0/ 1 1; femur 1 2 / 1 1 /0 1 (pd slightly thicker than other setae on the segment); genu 2 2 / 1 3 /0 1 (av slightly thicker than other setae on segment); tibia 2 1 / 1 3 / 1 2 (av and pv slightly thicker than other setae on the segment); tarsus 3 3 / 2 3 / 2 3 + mv, md (av 1–2, pv 1–2, mv and md slightly thicker than other setae on the segment; ad 2–3 and pd 2–3 longer than the others, as much as 0.41–0.43, 0.44 .0 48 and 0.63–0.70 × the length of tarsus IV respectively). All setae fine and needle-like unless otherwise noted.

Insemination structures. Not seen.

Male. Unknown.

Etymology. The name of the new species is derived from the Greek word lenis  (smooth), and refers to the smooth surface of sternal and epigynal shields.

Remarks. Gaeolaelaps lenis  is differentiated by the following combination of characters: dorsal shield with 38 pairs of setae (z 3 absent) and distinct reticulation posterior to J 1, the distance between J 4 –J 5 is nearly twice the length of J 4, sternal and epigynal shields smooth; peritremes short, extending to the middle-level of coxae II, and possesses small free post-stigmatic plate extending to the middle-level of coxa IV; tarsus of leg IV (125–134 long) with elongate setae: ad 2–3 (0.41–0.43 and 0.44 –048 × the length of tarsus IV respectively) and pd 2–3 (0.63–0.70 × the length of tarsus IV). It is similar to other species such as G. nolli ( Karg, 1962)  , G. arabicus ( Hafez et al., 1982)  , G. kargi ( Costa, 1968)  , G. praesternalis ( Willmann, 1949)  after Karg (1993) and G. iranicus Kavianpour & Nemati, 2013  in general appearance but can be distinguished as follows.

Gaeolaelaps nolli  with 39 pairs of dorsal shield setae (z 3 present), sternal shield has thin reticulation in lateral surface and epigynal shield distinctly reticulated, elongate pd 2–3 on tarsus IV, length of J 4 setae nearly equal to distance between J 4 –J 5.

Gaeolaelaps arabicus  (based on personal comm from Dr. A. K. Nasr), dorsal shield 39 pairs of setae (z 3 present), lacking dorsal shield reticulation, the endopodal plates small and triangular (elongate and angular in G. lenis  tarsus IV without elongate setae (ad 2–3 and pd 2–3 elongated in G. lenis  .

Gaeolaelaps kargi  , G. praesternalis  and G. iranicus  may be similar to G. lenis Vatankhah & Nemati  , but all of them have a long peritreme nearly extending to coxa I.