Catarhinus sanguinalus, Xue & Li, 2020

Xue, Xiao-Feng & Li, Ni, 2020, Two new species of diptilomiopid mites (Acari: Eriophyoidea) from China, Zootaxa 4896 (4), pp. 560-570 : 561-562

Catarhinus sanguinalus sp. nov.

( Figs 1–2 )

Description. Female (n = 6): Body fusiform, 224 (224–241), 76 (76–79) wide; light yellow in colour. Gnathosoma 31 (31–35), projecting downwards, cheliceral stylets 32 (30–32), pedipalp coxal seta (ep) 2*, dorsal pedipalp genual setae (d) 11 (9–11), palp tarsal ventral setae (v) 2*. Prodorsal shield 44 (44–45), including the frontal lobe, 62 (61–62) wide; median, admedian and submedian lines discontinuous, anterior half part distinct, while posterior part obscure, with many faint curved lines present on shield ( Figure 1B ). Scapular tubercles ahead of rear shield margin, 2 (2–3), setae sc 5 (4–5), 17 (17–18) apart, projecting centerad. Coxigenital region with 7 (6–7) semiannuli between coxae and genitalia, smooth; coxal plates with granules, anterolateral setae on coxisternum І (1b) 15 (15–16), 11* apart; proximal setae on coxisternum І (1a) 26 (25–26), 7 (6–7) apart; proximal setae on coxisternum ІІ (2a) 47 (41–47), 26 (26–27) apart. Prosternal apodeme absent. Leg І 34 (33–34), femur 11 (10–11), basiventral femoral setae (bv) absent; genu 5*, antaxial genual setae (l’’) 34 (34–40); tibia 9 (8–9), paraxial tibial setae (l’) 12 (11–12), located at basal 2/3; tarsus 6*, paraxial fastigial tarsal setae ft’ 10 (9–10), antaxial fastigial tarsal setae ft’’ 28 (26–28); tarsal empodium (em) 8 (7–8), simple, hair-like, tarsal solenidion (ω) 8 (7–8), tapered. Leg ІІ 33 (31–33), femur 11 (10–11), basiventral femoral setae (bv) 14 (12–14); genu 5*, antaxial genual setae (l’’) 9 (9–10); tibia 7*; tarsus 6 (6–7), paraxial fastigial tarsal setae ft’ 6 (6–7), antaxial fastigial tarsal setae ft’’ 22 (22–25); tarsal empodium (em) 7*, simple, hair-like, tarsal solenidion (ω) 7 (7–8), tapered. Opisthosoma dorsally with 52 (52–53) semiannuli, smooth, ventrally with 95 (93–95) semiannuli, with elliptical to linear microtubercles. Setae c2 21 (17–21), on ventral semiannulus 20 (18–20), 70* apart; setae d 61 (61–65), on ventral semiannulus 35 (35–37), 43 (43–45) apart; setae e 40 (40–45), on ventral semiannulus 57 (57–58), 24 (24–26) apart; setae f 36 (34–36), 28 (26–28) apart, on 10th ventral semiannulus from rear; setae h1 minute, setae h2 41 (41–49). Female genitalia 21 (18–21), 28 (26–28) wide, coverflap with many short ridges at base, setae 3a 30 (28–30), 18 (17–18) apart. Internal genitalia: spermathecae ovoid, oriented posterolaterad; spermathecal tubes relatively short; transverse genital apodeme trapezoidal.

Male (n = 2): Body fusiform, 182–191, 60–62 wide; light yellow in colour. Gnathosoma 30*, projecting downwards, cheliceral stylets 32*, pedipalp coxal seta (ep) 2*, dorsal pedipalp genual setae (d) 9*, palp tarsal ventral setae (v) 2*. Prodorsal shield 42*, including the frontal lobe, 49–53 wide. Scapular tubercles ahead of rear shield margin, setae sc 3*, 22–23 apart, projecting centrad. Coxigenital region with 6* semiannuli between coxae and genitalia, smooth; coxal plates with granules, anterolateral setae on coxisternum І (1b) 14–16, 10–11 apart; proximal setae on coxisternum І (1a) 20–23, 6–7 apart; proximal setae on coxisternum ІІ (2a) 30–34, 20–23 apart. Prosternal apodeme absent. Leg І 31–33, femur 11–12, basiventral femoral setae (bv) absent; genu 5*, antaxial genual setae (l’’) 25–25; tibia 6–7, paraxial tibial setae (l’) 10–11, located at basal 2/3; tarsus 6*, paraxial fastigial tarsal setae ft’ 8–10, antaxial fastigial tarsal setae ft’’ 22–26; tarsal empodium (em) 7*, simple, hair-like, tarsal solenidion (ω) 7–8, tapered. Leg ІІ 28–30, femur 10–11, basiventral femoral setae (bv) 10–11; genu 4–5, antaxial genual setae (l’’) 8–9; tibia 5–6; tarsus 6*, paraxial fastigial tarsal setae ft’ 7–8, antaxial fastigial tarsal setae ft’’ 20–22; tarsal empodium (em) 7*, simple, hair-like, tarsal solenidion (ω) 8*, tapered. Opisthosoma dorsally with 46–48 semiannuli, smooth, ventrally with 80–82 semiannuli, with elliptical to linear microtubercles. Setae c2 14–15, on ventral semiannulus 17–18, 54–58 apart; setae d 45–47, on ventral semiannulus 29–30, 44–48 apart; setae e 47–51, on ventral semiannulus 49*, 19–23 apart; setae f 28*, 24–26 apart, on 5th ventral semiannulus from rear; setae h1 minute, setae h2 35–36. Male genitalia 10*, 18* wide, setae 3a 22*, 15–16 apart.

Type material. Holotype, female (slide number NJAU-GD 136.1; marked Holotype), found on hairy finger-grass, Digitaria sanguinalis (L.) Scop. ( Poaceae ), Beiling Mountain, Zhaoqing City, Guangdong Province , 23°7′12″N, 112°29′46″E, elevation 60 m, 26 May 2018, coll. Xiao-Feng Xue,=deposited as a slide-mounted specimen in NJAU. Paratypes, 5 females and 2 males on 7 slides (slide number NJAU- GD136.2–NJAU- GD 136.8; marked Paratypes), from Digitaria sanguinalis (L.) Scop. ( Poaceae ), same details as holotype, deposited as slidemounted specimens in NJAU.

Relation to the plant host. Vagrant on lower leaf surface. No apparent damage to the host plant was observed.

Etymology. The specific designation sanguinalus is from the species name of host plant, sanguinalis ; masculine in gender.

Differential diagnosis. To date, 13 Catarhinus species were reported world-wide ( Table 1 ). C. sanguinalus sp. nov. is the most similar to C. microstegii Wei & Xie, 2009 , but can be differentiated by prodorsal shield with many short faint curves (no short faint curves in C. microstegii ), coxal plates with granules (coxal plates with short lines in C. microstegii ), setae h1 minute (setae h1 absent in C. microstegii ), and a distinct prodorsal shield design.

Figures

FIGURE 1. Catarhinus sanguinalus sp. nov. A, dorsal view; B, prodorsal shield; C, coxigenital area; D, internal genitalia of female; E, male genitalia; F, tarsus and empodium of leg II; G, gnathosoma and oral stylets. Scale bar: 10 μm.

FIGURE 2. Catarhinus sanguinalus sp. nov. AD, prodorsal shield; CG, female coxigenital area; em, empodium; GM, external male genitalia; IG, female internal genitalia; L1, leg І; L2, leg 2; PM, dorsal view of telosoma; VM, ventral view of telosoma. Scale bar: 20 μm for AD, PM, VM; 10 μm for L1, L2; 7.5 μm for CG, GM, IG, 5μm for em.