Trisetica knighti ( Radford, 1954 ) Stekolnikov, Alexandr A. & Quetglas, Juan, 2019

Stekolnikov, Alexandr A. & Quetglas, Juan, 2019, Bat-infesting chiggers (Acariformes: Trombiculidae) of the Balearic Islands and new data on the genus Trisetica Traub et Evans, 1950, Folia Parasitologica (017) 66, pp. 1-10 : 2-5

Trisetica knighti ( Radford, 1954) comb. n.

Figs 2–8

Trombicula knighti – Radford (1954): 298, fig. 49; Kolebinova (1966): 74, figs 1–5.

Trombicula (Anomalaspis) knighti

– Vercammen-Grandjean and Nadchatram (1963): 385.

Sasatrombicula (Rudnicula) knighti

– Vercammen-Grandjean (1965): 68.

Rudnicula knighti – Brown et al. (1988): 17.

Sasatrombicula (Rudnicula) balcanica

– Kolebinova (1966): 74, figs 6–11, syn. n.;

Kolebinova (1992): 69, fig. 36.

Rudnicula balcanica – Brown et al. (1988): 17.

H o l o t y p e d e p o s i t i o n: National Museum of Natural History, Washington, DC, USA ( Radford 1954, Goff 1989).

D i a g n o s i s: SIF = 4B-N(b)-3(4)-3111.0000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/B/NNB; fSc: AM ≥ PL> AL; Ip = 817–952; fD = 2H-10-14(15)-9(11)-8(7)+(5–11); DS = 47–54; VS = 48–62; NDV = 102–109. Standard measurements are given in Table 1 . The re-description is based on one paratype from ZIN, one paratype from NHM (1952.7.23.9), and five additional specimens ( ZIN 11168–11172 ) .

Re - de s c ri p ti on (la rv a)

Idiosoma Figs 2–4

Eyes 2 + 2. One pair of humeral setae and 45–52 barbed dorsal idiosomal setae; always 10 setae in 1 st row, 14 (15 in one additional specimen) setae in 2 nd row, 11 (in two additional specimens) or 9 (in one paratype and two additional specimens) setae in 3 rd row, 8 (in two additional specimens) or 7 (in one paratype and two additional specimens) setae in 4 th row, next 5–11 setae with ambiguous distribution by rows; four sternal setae; 48–62 ventral setae; total number of idiosomal setae ( NDV), excluding coxal and sternal, 102–109 .

Gnathosoma Fig. 5

Cheliceral blade with tricuspid cap; gnathobase sparsely covered with rather large puncta and bears one pair of branched setae; galeal setae nude or having small cilium (in specimen ZIN 11169); palpal claw with 3 visible prongs (4 prongs in specimen ZIN 11168); palpal femoral and genual setae with long branches, dorsal and lateral palpal tibial setae nude, ventral palpal tibial seta branched; palpal tarsus with 4 branched setae and basal tarsala.

A

0

Abbreviations:AW – distance between anterolateral scutal setae; SB – distance between sensillary bases; ASB – distance from the level of sensillary bases to extreme anterior margin of scutum; PSB – distance from the level of sensillary bases to extreme posterior margin of scutum; SD – length of scutum (ASB + PSB); AM – length of anteromedian scutal seta;AL – length of anterolateral scutal setae; PL – length of posterolateral scutal setae; H – length of humeral setae; D min – length of the shortest dorsal idiosomal seta; D max – length of the longest dorsal idiosomal seta; V min – length of the shortest ventral idiosomal seta; V max – length of the longest ventral idiosomal seta; pa – length of leg I (including coxa); pm – length of leg II (including coxa); pp – length of leg III (including coxa); Ip – sum of leg lengths (pa + pm + pp); DS – number of dorsal idiosomal setae (including humeral); VS – number of ventral idiosomal setae (excluding coxal and sternal); NDV – number of idiosomal setae (DS + VS); TaIIIL – length of leg tarsus III; TaIIIW – width of leg tarsus III.

Scutum Figs 3 , 6 , 7

Nearly hexagonal, with broadly rounded posterior margin and sparse large puncta; AM at level of ALs; PLs off scutum (peniscutum); anterior scutal angles with ALs tend to reduce; AM ≥ PL> AL; all scutal setae with pointed apices and covered with long barbs; sensilla densely covered with scale-like barbs in proximal half, slightly expanded and covered with large spikes in distal half.

Legs Fig. 8

All legs 7-segmented, with 1 pair of claws and claw-like empodium. Leg I: coxa with 1 non-specialised branched seta (1B); trochanter 1B; basifemur 1B; telofemur 5B; genu 4B, 3 genualae, microgenuala; tibia 8B, 2 tibialae, microtibiala; tarsus 22B, tarsala 20 μm long, microtarsala distal to tarsala, subterminala, parasubterminala, pretarsala. Leg II: coxa 1B; trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala; tibia 6B, 2 tibialae; tarsus 16B, tarsala 24 μm long, microtarsala proximal to tarsala, pretarsala. Leg III: coxa 1B; trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, very long genuala; tibia 6B, very long tibiala; tarsus 16B.

Figures

Fig 5. Trisetica knighti (Radford, 1954), larval specimen ZIN 11168. A – dorsal aspect of gnathosoma (cheliceral blade missing, only two prongs of palpal claw are visible); B – ventral aspect of gnathosoma (cheliceral blade missing, only two prongs of palpal claw are visible); C – palpal claw. Abbreviations: Ga – galeal seta; gns – gnathocoxal seta; ic – infracapitulum (gnathobase); PC – palpal claw; PF – palpal femur; PG – palpal genu; PTa – palpal tarsus; PTi – palpal tibia; S – palpal tarsala.

Fig. 2. Trisetica knighti (Radford, 1954), larva. A – arrangement of dorsal idiosomal setae in a paratype (ZIN); B – arrangement of ventral idiosomal setae in a paratype (ZIN; excretory pore is invisible); C – dorsal idiosomal seta in specimen ZIN 11168; D – ventral preanal idiosomal seta in specimen ZIN 11168. Scale bar 100 μm (A, B), 20 μm (C, D).

Fig. 3. Trisetica knighti (Radford, 1954), larval specimen ZIN 11170: scutum and dorsal idiosomal setae (sensilla missing). Abbreviations: AL – anterolateral scutal seta; AM – anteromedian scutal seta; H – humeral seta; PL – posterolateral scutal seta; SB – sensillary base.

Fig. 4. Trisetica knighti, larval specimen ZIN 11170: sternal area of idiosoma. Abbreviations: cxI – coxa I; cxII – coxa 2; cxIII – coxa III; ic – infracapitulum (gnathobase); sta – anterior sternal seta; stp – posterior sternal seta; V – ventral preanal setae.

Fig. 6. Trisetica knighti (Radford, 1954), larval specimen ZIN 11170: scutum (sensilla missing). Abbreviations: AL – anterolat- eral scutal seta; AM – anteromedian scutal seta; PL – posterolat- eral scutal seta; SB – sensillary base.

Fig. 7. Trisetica knighti (Radford, 1954), larval specimen ZIN 11171: scutum (one sensillum intact). Scale bar 25 μm. Abbreviations: AL – anterolateral scutal seta; AM – anteromedian scutal seta; S – sensillum; SB – sensillary base.

Fig. 8. Trisetica knighti (Radford, 1954), larva. A – genu, tibia, and tarsus of leg I in specimen ZIN 11168; B – trochanter, basifemur, and telofemur of leg I in specimen ZIN 11168; C – genu, tibia, and tarsus of leg II in specimen ZIN 11168; D – trochanter, basifemur, and telofemur of leg II in specimen ZIN 11168; E – genu, tibia, and tarsus of leg III in specimen ZIN 11169; F – trochanter, basifemur, and telofemur of leg III in specimen ZIN 11169. Abbreviations: f1 – famulus I; f2 – famulus II; ga – genuala I; gm – genuala II; gp – genuala III; mga – microgenuala I; mta – microtibiala; ST – subterminala; pST – parasubterminala; PT’ – pretarsala I; PT” – pretarsala II; S 1 – tarsala I; S 2 – tarsala II; ta – tibiala I; tm – tibiala II; tp – tibiala III.