Tegoprionus mesogibbosus, Flechtmann & Amrine, 2014

Flechtmann, C. H. W. & Amrine, Jr. J. W., 2014, A New Species Of Tegoprionus Keifer (Prostigmata: Eriophyidae) From Brazil, Described From All Motile Stages, With An Overview Of The Genus Tegoprionus, Acarologia 54 (1), pp. 81-88 : 82-87

Tegoprionus mesogibbosus n.sp.

( Figures 1 – 5 )

Diagnosis — Opisthosoma with four dorsomedian enlargements, each on contiguous semiannuli 8 – 11 or 9 – 12.

FEMALE (measured specimens: 6)

Idiosoma — 143 (135 – 179), 44 (44 – 50) wide. Yellowish when alive. Gnathosoma downcurved; pedipalp genual seta (d) undivided, 4 (4 – 5); pedipalp coxal seta (ep) 3 (2 – 3); chelicerae 12 (12 – 15). Prodorsal shield triangular, 29 (29 – 32) including frontal lobe, 37 (37 – 42) wide, smooth. Scapular setal tubercles on rear shield margin, 21 (21 – 23) apart; sc 19 (19 – 20), directed to the rear. Frontal lobe rounded, 4 (4 – 5) and 10 (10 – 11) wide at base. Legs with usual setae present. Leg I 23 (23 – 25); femur 7 (7 – 9), ventral basifemoral seta (bv) 7 (7-10); genu 4 (3 – 4), antaxial genual seta (l") 12 (12 – 16); tibia 5 (4 – 5), paraxial tibial seta (l’) 4 (5 – 4); tarsus 4 (5 – 4), antaxial fastigial tarsal seta (ft") 16 (16 – 22), paraxial fastigial tarsal seta (ft’) 12 (8 – 12), paraxial unguinal tarsal seta (u’) 5 (4 – 5), solenidion almost straight, blunt, 6 (6 – 8); empodium entire, 4 (4 – 6), 6-rayed. Leg II 21 (21 – 23); femur 6 (6 – 8), ventral basifemoral seta (bv) 6 (6 – 11); genu 4 (3-4), antaxial genual seta (l") 4 (4 – 9); tibia 4 (3 – 4); tarsus 5 (4 – 5), antaxial fastigial tarsal seta (ft") 14 (14 – 18), paraxial fastigial seta (ft’) 4 (4 – 5), paraxial unguinal tarsal seta (u’) 3 (3), solenidion as in leg I, 6 (6 – 8); empodium entire, 5 (5), 6-rayed. Coxisternal plates: coxisternal plates I and II granulated. Internal coxisternal apodeme like a line 5 (5 – 6) long. Anterior seta on coxisternum I (1b) 5 (5 – 6), 9 (8 – 9) apart; proximal seta on coxisternum I (1a) 13 (13 – 16), 6 (6 – 7) apart; proximal seta on coxisternum II (2a) 33 (33 – 40), 17 (17 – 19) apart. Coxigenital annuli 5 (4 – 5), faintly microtuberculate, almost smooth. Opisthosoma: with 18 (17 – 18) dorsal wide semiannuli, smooth; first 7 (7 – 8) annuli evenly arched in cross section, next 4 semiannuli each with a large dorsomedian enlargement and caudal 6 (6) annuli evenly arched. Ventral opisthosoma with 56 (49 – 56) semiannuli, with slightly ellyptical microtubercles; last 12 (12 – 13) ventral annuli with filamentous, elongate microtubercles. Opisthosomal lateral seta (c2) 11 (10 – 12), on annulus 5 (5 – 6) counting

Flechtmann C.H.W. and Amrine Jr. J.W.

from genitalia rear margin. Opisthosomal ventral seta I (d) 22 (22 – 27), 32 (32 – 35) apart, on annulus 16 (16 – 18); ventral seta II (e) 9 (9 – 11), 17 (17 – 22) apart, on annulus 35 (29 – 35); ventral seta III (f) 18 (18 – 20), 13 (12 – 13) apart, on annulus 51 (44 – 51) or 5 (5 – 6)th from rear. Opisthosomal caudal seta (h2) 45 (43 – 48); opisthosomal caudal seta (h1) 2 (2 – 3). Genitalia 7 (7 – 12), 17 (17 – 19) wide; epigynum with 8 (8 – 10) longitudinal parallel ridges. Proximal seta on coxisternum III, (3a) 32 (32 – 36), reaching past bases of opisthosomal ventral seta d.

MALE (measured specimens: 3)

Smaller than female, idiosoma 114 – 136, 38 – 41 wide. Gnathosoma: dorsal pedipalp genual seta undivided, 2; pedipalp coxal seta 2. Chelicerae 14. Prodorsal shield: 26 – 28 including frontal lobe, 33 – 38 wide, frontal lobe 4, wide at base 7 – 8. Scapular seta (sc) 16 – 17, setal tubercles 20 – 22 apart; frontal lobe 4, 7 – 8 wide. Legs: leg I 22 – 23; femur 7 – 8, bv 10 – 11; genu 3, l" 13 – 14; tibia 4-5, l’ 3 – 5; tarsus 4, ft" 11 – 13, ft’ 8 – 9, u’ 3, solenidion 6 – 7; empodium 5 – 6, 6-rayed. Leg II 21; femur 6 – 8, bv 6 – 7; genu 3, l" 7 – 8; tibia 4; tarsus 4 – 5, ft" 13 – 18, ft’ 5, u’ 3, solenidion 7; empodium 5 – 6, 6-rayed. Coxisternal plates: coxisternal plates I and II granulated; internal coxisternal apodeme 4 – 6. Setae: 1b 6 – 7, 7 – 8 apart; 1a 12 – 13, 6 – 8 apart; 2a 25 – 31, 15 – 18 apart. Coxigenital semiannuli 5, smooth. Opisthosoma: dorsal semiannuli as in female; 41 – 44 ventral annuli, microtubercles as in female. Opisthosomal setae: c2 10 – 13, on annulus 3; d 22 – 24, 26 – 28 apart, on anulus 12; e 8 – 10, 16 – 17 apart, on annulus 22-23; f 16 – 19, 11 – 13 apart, on annulus 36 – 38 or 6th from rear. Opisthosomal caudal seta h2 37 – 41, h1 2. Genitalia 11 – 12, 13 – 15 wide; seta 3a 19 – 23. Three males, out of 31, with similar dorsal opisthosomal annuli (without dorsomedian enlargements), 144 – 149 long.

NYMPH (measured specimens: 7)

Idiosoma — 99 – 145; prodorsal shield 29 – 32, including frontal lobe; frontal lobe 4, scapular seta 13 – 16, 20 apart. Shield rather smooth, but with two weak submedian ridges extending over the entire shield length, mesally connected by a transverse ridge, and a faint median ridge on posterior half of shield. Lateral borders of shield with 2 – 3 lines of round, hemisphaerical granules. Opisthosomal annuli equal dorso-ventrally in number: 38 – 42. First 27 – 28 annuli entirely microtuberculate; dorsal semiannuli 28/29 to 32/33 medially loosing progressively, from center, the microtubercles and slightly enlarged; posterior dorsal semiannuli without microtubercles.

LARVA (measured specimens: 2)

Idiosoma — 89 – 92; no clearly delimited prodorsal shield; scapular setae (sc) 10. Area anterior to scapular setal tubercles entirely microtuberculate, microtubercles round, hemisphaerical. Opisthosoma with 29 – 31 dorsoventrally equal anuli, microtuberculate, microtubercles ellyptical.

Type material — female holotype, position ringed on slide, 118 female paratypes, 31 male paratypes with opisthosomal dorsal enlargements, 3 male paratypes without enlargements, 7 nymph and 2 larva paratypes, collected from Inga sessilis (Vell.) Mart. ( Fabaceae , Mimosoideae ), Jardim Botânico , Curitiba, ParanAE, Brazil , 25°26’34”S, 49°14’22”W, coll. Dr. P. R. Demite and Mr. L. V. F. Silva, 04 April 2013, on 12 microscopic preparations: one preparation in the collection of Dr. J.W. Amrine Jr., holotype and remaining preparations in the Acarological Collection , Departamento de Entomologia e Acarologia , Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sªo Paulo, Brazil .

Relation to host — undersurface leaf vagrants; no visible damage.

Etymology — the specific designation mesogibbosus is derived from meso, Latin, middle position, and gibbosus, Latin, gibbus, humped, referring to the opisthosomal medio dorsal enlargements.

Remarks — Tegoprionus mesogibbosus n. sp. is the second species described in the genus. It differs from the type species basically in the number and position of the dorsomedial opisthosomal enlargements – enlargements on 7 annuli, irregularly spaced in the type species, enlargements on 4 contiguous annuli in the n. sp. As in the type species, the new species has morphologically different males, with and without the dorsomedial opisthosomal enlargements, the latter in much smaller number. The immature forms, larvae and nymphs of the n.sp. are readily distinguished, as is the case in Rhombacus eucalypti Ghosh and Chakrabarti and in Epitrimerus angustisternalis Flechtmann ( Flechtmann, 2010) .

Figures

FIGURE 1: Tegoprionus mesogibbosus n.sp. female: D dorsal habitus; V ventral habitus; IG internal genital structures.

FIGURE 2: Tegoprionus mesogibbosus n.sp.: L lateral habitus, female; L1, L2 legs I and II, female; E empodium, enlarged; GM external genitalia, male.

FIGURE 3: Tegoprionus mesogibbosus n.sp. Imatures: L larva; N nymph.

FIGURE 4: Tegoprionus mesogibbosus n.sp. females: A – dorsal and lateral habitus; B – female, detail of posterior part of dorsoopisthosoma; C – female, in lateral aspect.

FIGURE 5: Tegoprionus mesogibbosus n.sp.: A – larva; B – nymph.