Diptilomiopus indogangeticus, Chakrabarti & Sur & Sarkar, 2019

Chakrabarti, Samiran, Sur, Surajit & Sarkar, Sanjay, 2019, Two new species of Diptilomiopus Nalepa (Acari: Eriophyoidea) from India, Acarologia 59 (3), pp. 383-394 : 384-388

Diptilomiopus indogangeticus n. sp.

( Figures 1 , 2 )

Diptilomiopus ficivorus Sarkar, 2011: 120 . Invalid name, a thesis name.

Zoobank: 5F402A24-ED4A-49FF-AFDD-7AB6C7CB6878

Description

Female (n=15) — Live colour brown. Body fusiform, 145 (140–151), 67 (66–67) wide. Gnathosoma: 39 (38–39), abruptly curved down, palp setae d 6 (5–6), palp setae ep 3 (2–3). Prodorsal shield: 22 (22–24), 44 (44–46) wide, with complete network of cells composed of one central cell and a row of 12 cells on the anterior margin, a row of 7 cells on the posterior margin and in between these two rows another 6 cells; scapular tubercles 2 (2–3) and located ahead of shield margin; scapular setae sc absent. Leg I: 23 (23–24), femur 17 (16–17), femoral setae bv absent; genu absent; tibia 6 (5–6), tibial setae l′ absent; tarsus 6 (5–6), tarsal setae

ft′ 30 (29–30), tarsal setae ft″ 29 (29–31), setae u′ 2 (2–3); empodium em 10 (10–11), deeply divided, each branch 6-rayed, solenidion ω 9 (9–10), knobbed. Leg II: 21 (20–21), femur 13 (13–14), femoral setae bv absent; genu absent; tibia 4 (4–5), tibial setae l′ absent; tarsus 5 (5–6), tarsal setae ft′ 25 (25–27), tarsal setae ft″ absent, setae u′ 2 (2–3); empodium em 10 (10–11), deeply divided, each branch 6-rayed, solenidion ω 9 (9–10), knobbed. Coxae I: 14 (14–15), with granules, sternal line present; setae 1b absent; setae 1a 21 (21–22) and 8 (8–9) apart; coxae II: 14 (14–15), with granules as in coxae I, setae 2a 31 (30–31) and 15 (15–16) apart, setae 1a located little ahead of 2a. Opisthosoma: Dorsal annuli 64 (64–66) with two pairs

of lateral ridges; ventral annuli 62 (60–63), with small, roundish microtubercles, last 8 (7–8) ventral annuli with elongated and linear microtubercles; setae c2 absent; setae d 12 (10–12)

on ventral annulus 20; setae e 15 (14–15) on ventral annulus 32; setae f 19 (19–21) on ventral annulus 49; setae h1 absent, setae h2 32 (30–32). Genital coverflap: 16 (16–17), 22 (22–23) wide, with granules present on the basal part, setae 3a 7 (7–8). Internal genitalia: Apodeme short, spermathecae rounded with short funnel-like spermathecal tubes.

Male — Not found.

Etymology — The specific epithet is masculine in gender and indogangeticus ‘ ’ is derived from the locality of collections of infesting plants occurring Indo-Gangetic plane on the southern side of the River Ganges in Murshidabad district, West Bengal.

Type material — Holotype (circled): female (slide no. 1825/98/2016), 07 Aug. 2016, Chunakhali (24˚07′44″N, 88˚17′40″E, alt. 20 m a.s.l.), Murshidabad, West Bengal, India, from Ficus tinctoria subsp. gibbosa (Blume) Corner (Moraceae) , coll. S. Sur. Paratypes: 2 females and 4 nymphs in the slide bearing the holotype and 15 females (slide no. 1826-1828/98/2016), collection data as in the holotype.

Additional specimens: 7 females and 9 nymphs (slide no. 1392/72/2006), 14 Oct. 2006, Amriti (24˚20′38″N, 87˚05′29″E, alt. 30 m a.s.l.), Malda, West Bengal from the same host plant, coll. S. Sarkar.

Relation to the host plant — Mites are vagrant on lower surface of leaves showing no apparent damage symptoms.

Differential diagnosis — Diptilomiopus indogangeticus n. sp. shows many similarities with D. cayratus Cheng et al., 2012 ; D. euscaphiae Wang et al., 2009 ; D. lithocarpi Wang et al., 2009 ; D. ligustri Wang et al., 2009 and D. terstroemiae Wang et al., 2009 in having reticulated cellular network on prodorsal shield along with scapular tubercles and presence of palp setae d and ep. However, D. indogangeticus n. sp. can be separated from the above mentioned species by the absence of h1 setae and having 6-rayed empodium. The above Diptilomiopus species are very close and can be separated by the following key.

Remarks — The name Diptilomiopus ficivorus appeared previously in the Ph.D thesis by Sarkar (2011) for this species.

Key to the closely related species (mentioned in the differential diagnosis) of Diptilomiopus indogangeticus

1. Empodium 3-rayed; on Cayratia japonica (Thunb.) Gagnep (Vitaceae) ............................................................................. D. cayratus Cheng et al., 2012 — Empodium at least 6-rayed......................................................... 2 2. h1 setae absent; palp setae v lacking; empodium 6-rayed; on Ficus tinctoria subsp. gibbosa (Blume) Corner (Moraceae) ...................................... D. indogangeticus n. sp.

— h1 setae present; palp setae v present; empodium 7-rayed.............................. 3

3. Ventral annuli 62–64; genital coverflap sculptured with only granules; on Lithocarpus glaber (Thunb.) Nakai (Fagaceae) ................................ D. lithocarpi Wang et al., 2009 — Ventral annuli at least 77; genital coverflap either with granules and small lines or only sculptured with basal short lines....................................................... 4

4. Genital coverflap sculptured with basal short lines, dorsal annuli 60–71; on Ligustrum quihoui Carr. (Oleaceae) ..................................... D. ligustri Wang et al., 2009 — Genital coverflap with granules either at base or on whole coverflap region; dorsal annuli either 49–54 or 56–62................................................................ 5

5. Prodorsal shield cells arranged in 4 rows and without unpaired central cell; dorsal annuli 49–54; granules present only at basal part of genital coverflap; on Ternstroemia nitida Merr. (Theaceae) ............................................. D. terstroemiae Wang et al., 2009 — Prodorsal shield cells arranged in 3 rows and with an unpaired central cell; dorsal annuli 56–62; granules present on whole genital coverflap; on Euscaphis japonica (Thunb.) Kanitz (Staphyleaceae) ......................................... D. euscaphiae Wang et al., 2009

A further key can separate the Diptilomiopus species associated with plants within the family Moraceae .

Figures

Figure 1 Schematic drawings ofDiptilomiopus indogangeticusn. sp.: female: LM – lateral view of the mite; AD – dorsal view of prodorsal shield region; CG – coxi-genital region; L1 – leg I; L2 – leg II; Em – empodium; IG – internal genitalia.

Figure 2 Light micrographs ofDiptilomiopus indogangeticusn. sp.: female: A – prodorsal shield design; B – lateral view of annuli; C – dorsal ridges; D – coxi-genital region.