Eutrombicula pacae ( Floch and Fauran, 1957 )

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 : 525-527

publication ID

https://doi.org/ 10.11646/zootaxa.5141.6.1

publication LSID

lsid:zoobank.org:pub:2C24280B-51A8-4D5F-B11A-E96286948600

DOI

https://doi.org/10.5281/zenodo.6599371

persistent identifier

https://treatment.plazi.org/id/1C785E1A-FFF3-0070-6892-F982FBDC899A

treatment provided by

Plazi

scientific name

Eutrombicula pacae ( Floch and Fauran, 1957 )
status

 

Eutrombicula pacae ( Floch and Fauran, 1957) View in CoL

( Figs. 16–18 View FIGURE 16 View FIGURE 17 View FIGURE 18 )

Trombicula (Eutrombicula) pacae Floch and Fauran, 1957: 1 , fig. 1.

Eutrombicula pacae: Brennan & Reed 1974: 710 View in CoL ; Loomis & Wrenn 1984: 158; Stekolnikov et al. 2007: 65.

Diagnosis. SIF = 7BS-N-2-3111.1000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/B(N)/NNN; fSc: PL ≥ AM> AL; Ip = 764–810; fD = 2H-6-6-4-2-2(2-4-2); DS = 22; V = 14–15; NDV = 36–37. Inner prong of palpal claw twice as short as outer prong and located medially on the latter; scutal and dorsal idiosomal setae moderately barbed; scutum nearly trapezoidal, with small dense puncta, without transverse striae; sensilla (trichobothria) with ca. 7 branches in distal part; sensillary bases anterior to level of PL (PSB—P-PL = 6–9 µm). Standard measurements of examined specimens given in Table 7 View TABLE 7 .

Redescription (larva) (based on 7 specimens). IDIOSOMA ( Figs. 16 View FIGURE 16 , 17A–E View FIGURE 17 ). Eyes 2 + 2; 22 dorsal idiosomal setae, including one pair of humeral setae, moderately covered with 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; 14–15 ventral setae; NDV = 36–37.

GNATHOSOMA ( Fig. 17F, G View FIGURE 17 ). Cheliceral blade with tricuspid cap; cheliceral base with small dense puncta basally and more sparse puncta of different size 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 puncta and branched seta; palpal genu with puncta and branched (5 of examined specimens) or nude (2 of examined specimens) seta; palpal tibia with three nude setae; palpal tarsus with 7 branched setae, nude subterminala (ζ) and basal tarsala (ω).

SCUTUM ( Figs. 16C View FIGURE 16 , 17A View FIGURE 17 ). Nearly trapezoidal, densely covered with small puncta, without transverse striae, with small anterolateral shoulders, anterior scutal margin sinuous, lateral margins concave, posterior margin broadly rounded; AM at level of AL, sensillary (trichobothrial) bases anterior to level of PL (PSB—P-PL = 6–9 µm); all scutal setae uniform with dorsal idiosomal setae; PL ≥ AM> AL; flagelliform sensilla (trichobothria), with ca. 7 branches in distal half.

LEGS ( Fig. 18 View FIGURE 18 ). 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. French Guiana, Venezuela, Surinam, and Costa Rica ( Stekolnikov et al. 2007).

Hosts . Mammalia: Cuniculus paca (L.) (= Agouti paca ) ( Rodentia : Cuniculidae ), Dasyprocta leporina (L.) ( Rodentia : Dasyproctidae ), Proechimys guyannensis (É. Geoffroy) (= P. cayennensis ), P. semispinosus (Tomes) ( Rodentia : Echimyidae ), Rhipidomys sp. ( Rodentia : Cricetidae ), Caluromys philander (L.), Marmosops fuscatus (Thomas) (= Marmosa fuscata ), Marmosa robinsoni Bangs ( Didelphimorphia : Didelphidae ), Artibeus lituratus (Olfers) , Carollia brevicauda (Schinz) ( Chiroptera : Phyllostomidae ); Aves: Formicarius analis ( Passeriformes : Formicariidae ), Henicorhina leucosticta pittieri ( Passeriformes : Troglodytidae ), Turdus leucomelas Vieillot ( Passeriformes : Turdidae ) ( Stekolnikov et al. 2007).

New host records: Gymnopithys bicolor and Momotus lessonii .

Material examined. Ten larvae ( ZIN 9261–9270) ex F. analis No LT 157, 2 larvae ( ZIN 9249, 9251) ex G. bicolor No LT 131, 2 larvae ( ZIN 9291, 9294) ex H. leucosticta No LT 182, 3 larvae ( ZIN 9226, 9227, 9235) ex M. lessonii No LT 108, COSTA RICA: Cordillera de Talamanсa, Las Tablas, 20–22 August 2010.

Remarks. The most characteristic traits of this species, in addition to fD = B/B(N)/NNN, are a large distance between caudal setae ( Fig. 17D View FIGURE 17 ), the blunt posterior end of idiosoma ( Floch & Fauran 1957, fig. I, 3; compare with Fig. 16A View FIGURE 16 in the present paper), and the presence of two additional ventral caudal setae laterally ( Fig. 17E View FIGURE 17 ; fV = 6-2- 2-4 vs. 6-2-2- 2 in the drawings of all species described above). It is worth to notice that these setae are also present in the form described by Bassini-Silva et al. (2019) as E. tinami (fV = 6-2-2-4-2).

ZIN

Russian Academy of Sciences, Zoological Institute, Zoological Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Trombidiformes

Family

Trombiculidae

Genus

Eutrombicula

Loc

Eutrombicula pacae ( Floch and Fauran, 1957 )

Stekolnikov, Alexandr A., Capek, Miroslav & Literák, Ivan 2022
2022
Loc

Eutrombicula pacae: Brennan & Reed 1974: 710

Stekolnikov, A. A. & Literak, I. & Capek, M. & Havlicek, M. 2007: 65
Loomis, R. B. & Wrenn, W. J. 1984: 158
Brennan, J. M. & Reed, J. T. 1974: 710
1974
Loc

Trombicula (Eutrombicula) pacae

Floch, H. & Fauran, P. 1957: 1
1957
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