Diplothrombium sahragardi Noei and Saboori

Noei, Javad, Saboori, Alireza & Hajizadeh, Jalil, 2014, Two new species and one new record of larvae of the family Johnstonianidae (Acari: Prostigmata) from Iran with a key to species of the genus Diplothrombium, Zootaxa 3785 (2), pp. 241-257 : 242-247

Diplothrombium sahragardi Noei and Saboori , sp. nov.

Diagnosis. SD 80–89; PW 31–45; ASB 47–62; DS 37–74; Ta I 87 –92; IP 892–988; number of solenidia σ on Ge I 8–12.

Description. LARVA (n = 6). Dorsum. Idiosoma 285–430 long and 200–310 wide. Dorsum of idiosoma with triangular scutum of typical shape. Laterally on each side of scutum 1 pair of eyes, each pair situated on common ocular plate, anterior eye (diameter 12–15) slightly larger than posterior one (diameter 9–11). Scutum bearing 2 pairs of normal setae (AL and PL), 2 pairs of sensilla (AM and PSens) and an “I” shape longitudinal bar between basis of AM and posterior margin of scutum. AL and PL subequal in length and barbed. Anterior sensilla very short, posterior sensilla relatively long, both smooth. Posterior to scutum rows of barbed setae (DS): C row: c 1–3, D row: d 1–3, E row: e 1–3, F row: f 1–4, H row: h 1–4, each seta placed on a sclerite (fD= 34) ( Fig. 1 ). Venter. Coxa I with bifurcate setae 1b (37–45 long) and 1a (37–42) on pars medialis; supracoxal seta absent. Coxa II with simple setulose seta 2b (32–45); Claparède’s organ oval between coxae I–II. Coxa III with faintly barbed seta 3b (25–30); seta 3a faintly barbed (25–27) located between coxae. Posterior to coxa III approximately 75 (fV) barbed setae inserted on small platelets. Anal pore without surrounding sclerites ( Fig. 2 ). Gnathosoma. Hypostomal setae (bs) bifurcate; oral setae (or) simple and smooth. Supracoxal setae of palps absent. Palp trochanter (20–25 long) without setae, palp femur (47–62) and genu (17–20) each with 1 barbed seta. Palp tibia (37–42) with 3 barbed setae and distally bifid odontus, 13–16 long. Palp tarsus (67–74) considerably exceeding tibia, with single solenidion ω, 4 setulose and 3 barbed setae. Palpal setal formula (fPp) = 0-B-B-BBB2-7Bω. Cheliceral base 42–47 long, cheliceral blade curved and with 2 distinct subterminal teeth, 17–25 long ( Fig. 6 ). Legs. Leg segmentation formula 7-7-7. Leg setal formula. Leg I: Ta- 1ω, 1ε, 2ζ, 35–40n; Ti- 2φ, 6n; Ge- 8–12σ, 4n; TFe- 2θ, 5n; BFe- 1n; Tr- 1n ( Fig. 3 ). Leg II: Ta- 1ω, 1ε, 1ζ, 21–23n; Ti- 2φ, 6n; Ge- 2σ, 4n; TFe- 1θ, 4n; BFe- 2n; Tr- 1n ( Fig. 4 ). Leg III: Ta- 14–15n; Ti- 1φ, 6n; Ge- 2σ, 4n; TFe- 1θ, 4n; BFe- 2n; Tr- 1n ( Fig. 5 ). IP = 892–988. Femur of legs I–III only partially divided into basifemur and telofemur. All tarsi with 2 unequal claws and without empodium. Tarsus I with 1 terminal and 1 backwardly curved subterminal eupathidium (ζ), on tarsus II only 1 terminal eupathidium, no eupathidia on tarsus III. Famulus on tarsus I prolonged, famulus on tarsus II of normal minute size. Solenidion (ω) on tarsus II club-shaped.

Measurements provided in Table 1 .

.......continued on the next page Etymology. This species is named in honor of Prof. Ahad Sahragard (Department of Plant Protection, Faculty of Agriculture, Guilan University, Rasht, Iran) in appreciation of his work on ecology and biological control of insects and mites.

Type material. Holotype larva (ARS-20131003-1a) from soil (off host) [forest close to river], IRAN: Guilan province, Asalem city, Gijave village, 37° 42.077' N, 48° 54.077' E, 405 m a.s.l., 10 June 2010, coll. J. Noei; 5 larva paratypes (ARS-20131003-1b–f), same data, except 12 June 2010.

Type deposition. Holotype and 2 paratypes are deposited at the Acarological collection, Jalal Afshar Zoological Museum, Faculty of Agriculture, University of Tehran, Karaj, Iran, 3 paratypes – in the Acarological collection, Acarological Society of Iran, Karaj, Iran.

Differential diagnosis. This species is most close to Diplothrombium rackae in having Ta I <110, coxala II (2b) setulose and lateral coxala I (1b) bifurcate but differs from it in the number of solenidia on Ge I (8–12 vs. 6–9) and number of cheliceral teeth (two vs. one). Also D. sahragardi sp. nov. differs from the other species as follows: from D. cascadense in the number of solenidia on Ge I (8–12 vs. 8), normal setae on Ta I (35–40 vs. 32) and on Ta III (14–15 vs. 16), 2b (simple vs. bifid), number of cheliceral teeth (two vs. one), nasus (blunt vs. sharp); from D. monoense in the number of solenidia on Ge I (8–12 vs. 15), normal setae on Ta II (21–23 vs. 27) and on Ta III (14– 15 vs. 20), setae in rows C and D (6 vs. more than 6), 2b (simple vs. bifid), coarse pores near posterior margin of scutum and an irregular reticulum medially behind the sensilla (absent vs. present), number of cheliceral teeth (two vs. one); from D. creticum in the normal setae on Ta I (35–40 vs. 29–31), on Ta II (21–23 vs. 32) and on Ta III (14– 15 vs. 26), PL (barbed vs. smooth), idiosomal sclerites (platelet shape vs. tubular shape); differs from D. longipalpe in the number of normal setae on Ta I (35–40 vs. 29–30) and Ta III (14–15 vs. 17–18), 2b, AL and PL (barbed vs. smooth), number of cheliceral teeth (two vs. one), nasus (blunt vs. sharp), setae in rows C and D (6 vs. more than 6); from D. ludwinae in the number of solenidia on Ge I (8–12 vs. 7–8), number of normal setae on Ta III (14–15 vs. 16), AL and PL (barbed vs. smooth), medial coxala I (on coxa I vs. separated from coxa I); from D. zbigniewi in the number of solenidia on Ge I (8–12 vs. 6), number of normal setae on Ta I (35–40 vs. 30), ventral setae (all on platelets vs. only seven setae on platelets), 2b (setulose vs. nude), 1a (bifid vs. simple), AL (barbed vs. nude), medial coxala I (on coxa I vs. separated from coxa I), nasus (blunt vs. sharp); from D. moldavicum in the transverse bar of scutum (one vs. three); from D. newelli in the number of normal setae on Ta I (35–40 vs. 29), on Ta II (21– 23 vs. 20) and on Ta III (14–15 vs. 13), 2b (simple vs. bifid), medial coxala I (on coxa I vs. separated from coxa I) and shape of odontus on palp tibia (bifid vs. simple).

Figures

FIGURE 1. Diplothrombium sahragardi sp. nov. (larva), dorsal view of idiosoma.

FIGURE 2. Diplothrombium sahragardi sp. nov. (larva), ventral view of idiosoma.

FIGURE 6. Diplothrombium sahragardi sp. nov. (larva), dorsal (right) and ventral (left) view of gnathosoma.

FIGURES 3 - 5. Diplothrombium sahragardi sp. nov. (larva). 3. Leg I; 4. Leg II; 5. Leg III.

Tables

TABLE 1. Measurements of Diplothrombium sahragardi sp. nov. larvae (a, holotype; b – f, paratypes).

Character	a	b	c	d	e	f	Range
IL	285	428	334	297	359	411	285–428
IW	200	235	220	252	257	312	200–312
SD	84	89	82	?	87	80	80–89
W	57	64	64	50	54	50	50–64
AW	37	40	37	37	36	38	36–40
PW	40	45	40	?	31	40	31–45
AA	8	10	10	8	9	9	8–10
SB	32	37	32	32	32	32	32–37
ASB	54	62	54	54	58	47	47–62
PSB	27	30	27	?	31	32	27–32