Eutrombicula goeldii ( Oudemans, 1910 )

Stekolnikov, Alexandr A., Capek, Miroslav & Literák, Ivan, 2022, New species and records of chiggers (Acariformes: Trombiculidae) from birds of the Neotropics, Zootaxa 5141 (6), pp. 501-552 : 518-521

Eutrombicula goeldii ( Oudemans, 1910)

( Figs. 10–12 )

Microthrombidium göldii Oudemans, 1910: 84 ; 1912: 13, fig. B.

Trombicula (Eutrombicula) göldii: Jenkins 1949: 312 , figs. 8, 9 (larva), 11 (adult).

Eutrombicula göldii: Fuller 1952: 136 .

Eutrombicula goeldii: Brennan & Reed 1974: 710 , figs. 4, 19; Loomis & Wrenn 1984: 158; Jacinavicius et al. 2018: 9.

Diagnosis. SIF = 7BS-N-2-3111.1000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/N/NNN; fSc: PL> AM> AL; Ip = 934–1001; fD = 2H-6-6-4-2-2(2-4-2); DS = 20–22; V = 12–14; NDV = 34. Inner prong of palpal claw twice as short as outer prong and located medially on the latter; scutal and dorsal idiosomal setae thin, sparsely covered with small barbs; scutum nearly trapezoidal, with small dense puncta and transverse striae; sensilla (trichobothria) with ca. 8 branches in distal two thirds; sensillary bases far anterior to level of PL (PSB—P-PL = 10–15 µm); leg coxae with longitudinal striae. Standard measurements of examined specimens given in Table 5 .

Redescription (larva) (based on 7 specimens). IDIOSOMA ( Figs. 10 , 11A–E ). Eyes 2 + 2; 20–22 dorsal idiosomal setae, including one pair of humeral setae, sparsely covered with small barbs, by 6 setae in 1 st and 2 nd (D) posthumeral rows, 4 setae in 3 rd (E) row, by 2 setae in 4 th (F) and 5 th (H) rows (setae in last 3 rows can be also counted as 2-4-2); 4 sternal setae; 12–14 ventral setae; NDV = 34.

GNATHOSOMA ( Fig. 11F, G ). Cheliceral blade with tricuspid cap; cheliceral base with small dense puncta basally and more sparse puncta in distal part; gnathobase with small dense puncta, transverse striae, and 1 pair of branched gnathocoxal (tritorostral) setae; galeal (deutorostral) seta nude; palpal claw with 2 prongs, inner prong twice as short as outer prong and located medially on the latter; palpal femur with numerous puncta and branched seta; palpal genu with puncta and nude seta; palpal tibia with three nude setae; palpal tarsus with 7 branched setae, nude subterminala (ζ) and basal tarsala (ω).

SCUTUM ( Figs. 10C , 11A ). Nearly trapezoidal, densely covered with small puncta, with transverse striae, without anterolateral shoulders, anterior scutal margin almost straight, lateral margins slightly concave, posterior margin almost straight in middle part and obliquely cut at edges; AM at level of AL, sensillary (trichobothrial) bases far anterior to level of PL (PSB—P-PL = 10–15 µm); all scutal setae uniform with dorsal idiosomal setae; PL> AM> AL; flagelliform sensilla (trichobothria), with ca. 8 branches in distal half.

LEGS ( Fig. 12 ). All 7-segmented, with 1 pair of claws and claw-like empodium. Leg I: coxa with 1 branched seta (1B); trochanter 1B; basifemur 1B; telofemur 5B; genu 4B, 3 genualae (σ), microgenuala (κ); tibia 8B, 2 tibialae (φ), microtibiala (κ); tarsus 22B, tarsala (ω), microtarsala (ε) distal to tarsala, subterminala (ζ), parasubterminala (z), pretarsala (ζ). Leg II: coxa 1B; trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala; tibia 6B, 2 tibialae (φ); tarsus 16B, tarsala (ω), microtarsala (ε) proximal to tarsala, pretarsala (ζ). Leg III: coxa 1B; trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, genuala; tibia 6B, tibiala; tarsus 14B, mastitarsala.

Distribution. Brazil, Bolivia, Colombia, Costa Rica, Dominica, Panama, Surinam, Trinidad, Venezuela ( Jacinavicius et al. 2018; Bassini-Silva et al. 2021), and Peru (this study).

Hosts . Various species of mammals and birds, three species of lizards and one snake ( Bassini-Silva et al. 2021).

Material examined. Total 29 larvae (interval of numbers: ZIN 8821–8894 ) ex Leptotila rufaxilla Nos IQ 20, IQ33, IQ37, PERU: Iquitos , National Reserve Allpahuayo Mishana, 15–16 August 2011 .

Figures

FIGURE 10. Eutrombicula goeldii (Oudemans, 1910), specimen ZIN 8829. A—general view, B—dorsal aspect of idiosoma, C—scutum, D—ventral aspect of idiosoma. Scale bars: 100 µm (A), 50 µm (B–D).

FIGURE 11. Eutrombicula goeldii (Oudemans, 1910). A—scutum and eyes (specimen ZIN 8829), B—dorsal idiosomal seta (specimen ZIN 8829), C—ventral idiosomal seta (specimen ZIN 8829), D—ventral aspect of idiosoma (specimen ZIN 8830), E—dorsal aspect of idiosoma (specimen ZIN 8830), F—ventral aspect of gnathosoma (specimen ZIN 8829), G—dorsal aspect of gnathosoma (specimen ZIN 8829). Abbreviations as in Fig. 2. Scale bars: 50 µm (A), 20 µm (B, C, F, G), 100 µm (D, E).

FIGURE 12. Eutrombicula goeldii (Oudemans, 1910), specimen ZIN 8830. A—leg I (trochanter–tarsus), B—leg II (trochant- er–tarsus), C—leg III (trochanter–tarsus). Abbreviations as in Fig. 3.