Dolichodectes latilobus Constantinescu, 2018

Constantinescu, Ioana Cristina, Chişamera, Gabriel Bogdan, Petrescu, Angela & Costică, Adam, 2018, Two new species of feather mites (Acarina: Psoroptidia) from the Oriental Magpie-Robin, Copsychus saularis (Passeriformes: Muscicapidae), Acarologia 58 (2), pp. 313-331 : 315-318

Dolichodectes latilobus Constantinescu n. sp. ( Figs. 1 – 4)

Zoobank: CF94906A-A01F-4B71-AE9E-6AA3599C88A7

Type material — Holotype male and 16 paratypes (5 males and 11 females), from Copsychus saularis (Linnaeus) ( Passeriformes : Muscicapidae ), Indonesia, Kalimantan Island, Lhok Tuan, east of the Kutai National Park , 18 May 1991, bird inventory number 15719-47, no other data.

Type deposition — Holotype male ( ANA 787 ), 4 male ( ANA 788 – 791 ) and 9 female

( ANA 792 – 800) paratypes in MGAB collection, 1 male and 2 female paratypes in DZUnesp-

RC collection.

Etymology — The specific epithet refers to the widened posterior ends of the opisthosomal lobes in males (from Latin latus = wide, broad).

Description — MALE (holotype, range for 4 paratypes) — Length of idiosoma 436 (456 – 472), width 124 (112 – 120), length of hysterosoma 340 (328 – 342). Prodorsal shield: anterior margin with triangular rostral process, lateral margins without incisions around scapular setae, posterior margin concave, antero-lateral extensions widely connected to bases of epimerites Ia, length along midline excluding rostrum 120 (122 – 134), width at posterior margin 102 (82

– 112), posterior part with wavy transverse striae. Setae ve represented by alveoli. Scapular setae se separated by 52 (50 – 60). Humeral shields present, poorly developed, separated from epimerites III, not encompassing setae cp. Setae c2 situated on soft tegument, near anterior end of humeral shields. Setae c3 lanceolate, 20 (20 – 24) x 8 (7 – 8). Hysteronotal shield: greatest length from anterior margin to lobar apices 240 (240 – 245), width at anterior margin 96 (96

– 114), anterior margin almost straight, strongly narrowed between levels of setae d2 and e1, anterior half of this shield with wavy transverse striae, area from level of trochanters IV to bases of opisthosomal lobes with small ovate lacunae. Opisthosomal lobes widened in posterior half, posterior end of each lobe with a pair of narrow divergent extensions (outer extension rounded apically, inner extension acute), lateral margins at level of setae h2 convex ( Fig. 1A). Terminal cleft a narrow parallel-sided slit, with lateral margins touching, length 56 (50 – 56). Supranal concavity long and narrow, setae f2 and ps2 situated at the same transverse level. Setae h1 situated approximately equidistant from levels of setae f2 and setae e2. Setae h3 lanceolate,

with strongly narrowed posterior end and round tips, length 72 (72 – 80), greatest width 14 (11 – 13); setae ps2 74 (60 – 72) long, extending beyond to lobar apices; setae ps1 filiform, 10 (12

– 14) long. Distance between bases of dorsal setae: c2 – d2 110 (112 – 122), d2 – e2 86 (90 –

100), e2 – h2 66 (64 – 70), h2 – h3 36 (32 – 38), h2 – h2 24 (24 – 28), h3 – h3 20 (18 – 20), d1

– d2 46 (46 – 50), e1 – e2 36 (30 – 40), h1 – h2 44 (36 – 44), ps1 – h3 5 (4 – 6).

Epimerites I fused into a Y, sternum about ½ of total length of epimerites, posterior end of sternum with transverse extensions connected with medial part of epimerites II. Coxal fields

I, II without large sclerotized areas. Coxal fields I – IV closed. Coxal fields IV with large sclerotized areas at bases of trochanters IV. Genital arch 18 (17 – 19) long, 22 (20 – 24) wide, basal sclerite of genital apparatus large, shaped as inverted trapezium. Aedeagus 61 (58 – 62) long, extending almost to posterior margin of the genital shield. Genital papillae well distinct, situated at midlevel of genital arch. Paragenital apodemes fused each other by their medial parts, anterior branches of these apodemes fused with inner margins of epimerites IIIa and posterior branches fused with epimerites IVa. Genital shield, posterior branches of paragenital apodemes and shield-like areas of coxal fields IV fused altogether to form closed sclerotized area surrounding genital apparatus ( Fig. 2E ). Setae 4b on anterior branches of paragenital apodemes, setae 4a on posterior branches of paragenital apodemes, setae g on inner margin of genital shield. Opisthoventral shields fused together immediately posterior to anal opening, forming entire shield covering posterior third of idiosoma. Anal shields absent, setae ps3

situated near anterior margin of opisthoventral shield. Anal suckers 11 (11 – 12) in diameter, corolla without indentations. Distance between ventral setae: 4b – 4a 52 (52 – 54), 4a– g 42

(36 – 40), g – ps3 54 (52 – 60), ps2 – ps2 36 (34 – 36), ps3 – ps3 32 (30 – 32), ps3 – h382 (84

– 88).

Legs I longer and thicker than legs II, tarsus I with dorsal and ventral longitudinal crest, tibia and genu I with dorsal longitudinal crest, femur I with dorso-lateral longitudinal crest, femur II with ventral longitudinal crest, genu IV with two ventral crests ( Fig. 2A – D ). Setae ra of tarsus I spiculiform, setae d of tarsus II half as long as corresponding seta f. Tarsus IV 22 (24 –

30) long, with small apical claw-like process and blunt-angular ventral extension; seta d hemispherical, situated in proximal part of this segment; setae e absent. Length of solenidia: ω1 I 12

(12 – 16), ω1 II 15 (16 – 21), φ I 80 (81 – 86), φ II 46 (44 – 54), φ III 26 (24 – 30), φ IV 34 (40 – 41).

FEMALE (range for 5 paratypes) — Length of idiosoma (excluding terminal appendages) 414 – 432, width 116 – 124, length of hysterosoma 296 – 320. Prodorsal shield: antero-lateral extensions wide and connected to epimerites Ia, posterior margin slightly convex, 108 – 116 long, 90 – 112 wide, anterior part with ovate lacunae, posterior part with transverse dashes and lacunae ( Fig. 3A ). Setae ve represented by alveoli. Setae se separated by 50 – 60. Humeral shields represented by small longitudinal sclerite, setae c2 situated on soft tegument. Setae c3 lanceolate, 20 – 24 x 7 – 8. Anterior and lobar parts of hysteronotal shield separated by narrow transverse band of soft tegument. Hysteronotal shield with anterior margin almost straight, posterior margin with deep and narrow median invagination extending to level e2 ofsetae,

length 240 – 245, width at anterior margin 96 – 114, anterior two thirds of this shield with transverse dashes, posterior one third with few ovate lacunae. Length of lobar region 58 – 70, width 68 – 72, median part of anterior margin slightly convex. Terminal cleft parallel-sided, narrow, with lateral margins almost touching, 50 – 56 long. Supranal concavity absent, setae f2 present, setae h1 on lobar shield, near its anterior margin. Setae h2 spindle-like, 48 – 52 long, 8

– 10 wide. Setae ps1 slightly closer to outer margins of opisthosomal lobes than inner margins, and close to lobar apices. Setae h3 filiform, 10 – 14 long. Distance between bases of dorsal setae: c2 – d2 108 – 114, d2 – e2 86 – 92, e2 – h2 36 – 42, h2 – h3 42 – 50, h2 – h2 42 – 50, h3

– h3 20 – 26, d1 – d2 40 – 50, e1 – e2 31 – 40, h1 – h2 14 – 18, h1 – h1 22 – 26, ps1 – h2 34 –

36.

Epimerites I fused into Y, sternum strongly narrowed posteriorly, about 1/5 from total length of epimerites ( Fig. 3B ). Epimerites II extending slightly beyond level of anterior margin of epigynum. Epimerites IVa present. Translobar apodemes of opisthosomal lobes wide, not fused to each other anterior to terminal cleft. Copulatory opening located ventraly, immediately posterior to anal opening. Primary spermaduct with punctuated enlargement in proximal part, secondary spermaducts 10 – 13 long ( Fig. 4E ). Distance between pseudanal setae: ps2 – ps2

31 – 35, ps3 – ps317 – 20, ps2 – ps3 20 – 22.

Legs I slightly longer than legs II, femur II with ventral crest; other segments of legs I, II without processes. Setae d of tarsi II – IV much shorter than corresponding setae f. Length of solenidia: ω1 I 12 – 16, ω1 II 7 – 10, φ I 64 – 70, φ II 50 – 52, φ III 22 – 26, φ IV 6 – 8.

Figures

Figure 2 Dolichodectes latilobusn. sp., male: A – D details of legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV; E – details of opisthosoma.

Figure 3 Dolichodectes latilobusn. sp., female: A – dorsal view; B – ventral view.

Figure 4 Dolichodectes latilobusn. sp., female: A – D details of legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV; E – spermatheca; Abbreviations: hs – head of spermatheca, pd – primary spermaduct, sd – secondary spermaduct, co – copulatory opening.