Diptilomiopus augustifoliae, Sur & Roy & Chakrabarti, 2018

Sur, Surajit, Roy, Sourav & Chakrabarti, Samiran, 2018, Two new eriophyoid mites (Acari: Eriophyoidea) from West Bengal, India, Zootaxa 4434 (1), pp. 193-200 : 196-197

Diptilomiopus augustifoliae n. sp.

( Figs. 3 , 4 )

Diagnosis. Prodorsal shield with 10 cells in anterior row, six cells in medial row, four cells in posterior row plus posteromedial cell, pedipalp tarsal ventral setae v absent, genital coverflap with broken striations on basal part only, setae h1 absent.

FEMALE (holotype and 12 paratypes): Body spindleform, yellow coloured, 195 (175–195), 88 (80–91) wide. Gnathosoma—39 (37–40), abruptly curved downward; pedipalp genual setae d 6 (6–7), pedipalp coxal setae ep 2 (2–3), cheliceral stylets 53 (53–54). Prodorsal shield—29 (29–30), 49 (48–50) wide, frontal lobe absent; median line and admedian lines not complete; shield designs with anterior row of horizontal cells, comprising 10 cells along anterolateral shield margin, second row with six cells, third row with four cells plus posteromedial cell, prodorsal shield with some transverse dashes anteriorly; scapular tubercles 2 (2–3) present but scapular setae sc absent. Sternal line present. Coxae I—14 (14–15), with numerous small dashes; anterolateral setae 1b absent; proximal setae on coxisternum I 1 a 32 (32–34) and 5 (4–5) apart; coxae II—14 (14–15), with very few dashes but not distinct as on coxae I, proximal setae on coxisternum II 2 a 42 (39–42) and 12 (12–14) apart, setae 1a located little ahead of 2a, not in same line. Leg I—38 (38–41), femur 16 (16–17), basiventral femoral seta bv absent; tibia 6 (6–7), paraxial tibial setae l ′ absent; tarsus 10 (10–11), paraxial fastigial tarsal setae ft ′ 33 (31–33), antaxial fastigial tarsal setae ft″ 32 (30–32), paraxial unguinal tarsal setae u ′ 3 (2–3); tarsal empodium em 8 (8–9), divided, each branch 6–rayed, tarsal solenidion ω 4 (4–5), knobbed. Leg II—30 (30–32), femur 10 (10–11), basiventral femoral seta bv absent; tibia 4 (4–5), paraxial tibial setae l ′ absent; tarsus 10 (10–11), paraxial fastigial tarsal setae ft ′ 29 (29–30), antaxial fastigial tarsal setae ft″ absent, paraxial unguinal tarsal setae u ′ 3 (2–3); tarsal empodium em 8 (8–9), divided, each branch 6–rayed, tarsal solenidion ω 6 (6–7), knobbed. Opisthosoma—with faint median dorsal ridge, dorsal annuli 64 (64–66); ventral annuli 86 (85–86), with rounded microtubercles, last 8 annuli with microstriations; setae c2 absent; setae d 12 (12–13) on ventral annulus 29; setae e 5 (5–6) on ventral annulus 53; setae f 26 (26–27) on ventral annulus 78; setae h1 absent, setae h2 40 (40–41). Genital coverflap—15 (15–16), 26 (26–28) wide with broken longitudinal striations on basal part, proximal setae on coxisternum III 3a 6 (6–7), 18 (18–19) apart. Internal genitalia—apodeme curved, short spermathecal duct leads to abbreviated and rounded spermathecae.

MALE (n=1): Smaller than female, body 158, 65 wide. Coxae I—11, with several small dashes; proximal setae on coxisternum I 1a 23 and 4 apart; coxae II—11, with very few dashes but not distinct as on coxae I, proximal setae on coxisternum II 2 a 32 and 10 apart. Leg I—33, femur 13, tibia 5; tarsus 9, paraxial fastigial tarsal setae ft ′ 28, antaxial fastigial tarsal setae ft″ 27, paraxial unguinal tarsal setae u ′ 3; tarsal empodium em 7, divided, each branch 6–rayed, tarsal solenidion ω 4, knobbed. Leg II—28, femur 9; tibia 4, tarsus 9, paraxial fastigial tarsal setae ft ′ 27, paraxial unguinal tarsal setae u ′ 3; tarsal empodium em 7, divided, each branch 6–rayed, tarsal solenidion ω 6, knobbed. Male genitalia—19 wide, proximal setae on coxisternum III 3a 6, 13 apart.

Type material. Holotype: Female (marked) on slide (no. 1812/101/2016), INDIA: West Bengal, Jalpaiguri, Golabari, 26˚31′N, 88˚17′E, altitude 228 m, 20 August, 2016 on Ambroma augusta (L.) ( Sterculiaceae ), coll. S. Sur. Paratypes: 4 females, 4 nymphs and 1 male on slide bearing holotype and 14 females and 6 nymphs on 8 slides (nos. 1813-1820 /101/2016), collection data same as holotype; 6 females and 3 nymphs on 2 slides (nos. 1886-1887 / 35/2015), Hooghly, Konnagar, 22˚70′N, 88˚34′ E, altitude 10 m, 17 July, 2015 on same host plant, coll. S. Roy.

Relation to host. The yellow coloured mites are vagrant on the under-surfaces of leaves.

Etymology. The specific epithet is masculine gender and is derived from the species name of the host plant plus foliae from Latin ‘folium’—noun meaning leaf (masculine ‘ ae ’) designating site of infestation.

Remarks. Diptilomiopus augustifoliae n. sp. comes very close to Diptilomiopus ambromae Wang, Wei & Yang, 2009 in having the prodorsal shield with a reticulated network of cells and median ridges on dorsal annuli, but remains distinct by presence of scapular tubercles, absence of pedipalp tarsal ventral setae v, absence of accessory setae h1, prodorsal shield with six cells in medial row and with posteromedial cell and genital coverflap with basal striations (versus scapular tubercles absent; pedipalpal seta v and accessory setae h1 present; eight cells in medial row and posteromedial cell divided into two; coverflap with irregular broken patterning).

This new species belongs to the group of Diptilomiopus having scapular tubercles in combination with a reticulated cellular network on prodorsal shield, at least 57 species belong to this group. Among these species, D. augustifoliae n. sp. comes very close to Diptilomiopus camerae Mohanasundaram, 1981 and D. debregeasiae Li, Wei & Wang, 2009 by the presence of a 6-rayed empodium and absence of h1 setae but remains distinctly different in having pedipalp coxal setae ep, basal striations on genital coverflap and number and arrangement of cells on the prodorsal shield.

Figures

FIGURE 3. Diptilomiopus augustifoliae n. sp.: Female:—D—Dorsal mite; CG—Coxal-genital region; L1—Leg I; L2—Leg II; LO—Lateral opisthosoma; em—empodium; IG—Internal genitalia; d—Pedipalp; GM—Genital region, male.

FIGURE 4. Diptilomiopus augustifoliae n. sp.: Female:—a—Prodorsal shield; b—Median ridge; c—Coxal-genital region; Male:—d—Genitalia.