Schoutedenichia centralkwangtunga (Mo, Chen, Ho and Li, 1959)

Antonovskaia, Anastasia A. & Stekolnikov, Alexandr A., 2021, Redescriptions of ten chigger mite species (Acariformes: Trombiculidae) from Vietnam, Zootaxa 4969 (1), pp. 1-53 : 38-41

Schoutedenichia centralkwangtunga (Mo, Chen, Ho and Li, 1959)

( Figs. 23C–E , 28–30 )

Eushoengastia centralkwangtunga Mo, Chen, Ho and Li, 1959: 255 , figs. 17–24.

Schoutedenichia centralkwangtunga: Domrow 1962: 359 , figs. 1–10; Lakshana 1973: 20; Wen 1984: 304; Li et al. 1997: 432, fig. 2-36-2; Chau et al. 2007: 149, fig. 72; Chaisiri et al. 2016: 332.

Schoutedenichia (Schoutedenichia) centralkwangtunga: Vercammen-Grandjean 1965b: 102 ; 1968: 96.

Schoutedenichia alongensis Schluger, Grochovskaja, Ngu, Hoe and Tung, 1960a: 191 , fig. 12; Kudryashova 2004: 37.

Diagnosis. SIF = 4BS-N-3-2110.0000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = N/N/NNN; fSc: PL> AM> AL; Ip = 548–672; fD = 4H-[7-3]-10-8-8-7-6-2; DS = 48–55; V = 45–48; NDV = 96–103. Eyes absent. Standard measurements of the type series of Schoutedenichia alongensis given in Table 9 .

Description (larva) [based on lectotype and 2 paralectotypes of S. alongensis ]. IDIOSOMA ( Figs. 23C–E , 28 ). Eyes absent; 48–55 barbed dorsal idiosomal setae, including two pairs of humeral setae; 4 sternal setae; 45–48 ventral setae; NDV = 96–103.

GNATHOSOMA ( Fig. 29A, B ). Cheliceral blade with tricuspid cap; gnathobase with sparse puncta and 1 pair of branched setae; cheliceral base and palpal femur with sparse puncta; galeala nude; palpal claw with 3 prongs; setae on palpal femur, genu, and tibia nude; palpal tarsus with 4 branched setae, nude subterminala, and tarsala.

SCUTUM ( Fig. 23C, D ). Trapezoidal, wider than long, with concave posterior margin, moderately covered with small puncta, with 1 AM, 1 pair of ALs, and 1 pair of PLs; all scutal setae uniformly barbed; AM at level of ALs; PLs much longer AM, ALs shorter AM; sensilla claviform, covered with setules; sensillum bases situated at equal distances from levels of ALs and PLs.

LEGS ( Fig. 29C–E ). 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, 2 genualae, microgenuala; tibia 8B, 2 tibialae, microtibiala; tarsus 22B, tarsala, microtarsala slightly proximal 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, microtarsala near and proximal to tarsala, pretarsala. Leg III: coxa 1B; trochanter 1B; basifemur 1B; telofemur 3B; genu 3B, genuala; tibia 6B; tarsus 15B.

Hosts. Suncus murinus (Mo et al. 1959) , Leopoldamys edwardsi [= Rattus edwardsi (Domrow 1962) ; = Rattus grochovskii D. Tien (nomen nudum) ( Schluger et al. 1960a)], Herpestes javanicus (É. Geoffroy, 1818) ( Carnivora : Herpestidae ), Tamiops mcclellandi i (Horsfield, 1840) ( Rodentia : Sciuridae ), Bandicota indica , Crocidura horsfieldi , Menetes berdmorei , Niviventer niviventer , Rattus rattus , Tupaia glis ( Lakshana 1973) , Niviventer confucianus , Rattus tanezumi (= Rattus flavipectus ) (Wen 1984), Rattus andamanensis (= R. koratensis ) ( Chau et al. 2007).

Distribution. China (Mo et al. 1959; Wen 1984), Thailand ( Lakshana 1973; Chaisiri et al. 2016), Vietnam (Domrow 1962).

Type material examined ( Fig. 30 ). Lectotype of Schoutedenichia alongensis (here designated): larva ZMMU Tdt-3278 (specimen 3) ex L. edwardsi No 27 [labeled as “ Rattus sp. n. ( Rattus grochovskii )”], Vietnam, Quang Ninh Province, Ha Lam District, Ha Long (= Hon Gai), 1 February 1956, coll. I.M. Grochovskaja. Paralectotypes of Schoutedenichia alongensis : one larva ZMMU Tdt-3277 (specimen 1), same collection data as for lectotype; one larva ZMMU Tdt-3279 (specimen 4) ex Rattus rattus No 421, Vietnam, Quang Tri Province, Vinh Linh, 18 August 1956, coll. I.M. Grochovskaja.

Additional material examined. One larva ZIN 9844 ex Bandicota indica No. R 7112, Thailand, Tak Province, Mae Sot District , rice field (harvested), Lat. 16.48168, Long. 98.44047, 30 November 2013, coll. K. Chaisiri.

Remarks. Schoutedenichia alongensis was synonymized with S. centralkwangtunga by Domrow (1962) who examined two of its specimens collected from Suncus murinus in Saigon (currently Ho Chi Minh City) in South Vietnam. He provided measurements of scutum and scutal setae of these specimens. Comparison of our measurements of the S. alongensis type series, measurements of one additional specimen of S. centralkwangtunga from Thailand, and the reference data provided by Mo et al. (1959) and Domrow (1962) shows that these data constitute a continuous range of variability for the most part of characters ( Table 9 ). One exception is the width of scutum (AW, PW, and SB), which is clearly smaller in the type series of S. centralkwangtunga than in other materials. That could be a result of geographic variation or a deformation of the scutum during preparation in the latter set of materials.

Figures

FIGURE 23. Doloisia gigantea (Schluger, Grochovskaja, Ngu, Hoe and Tung, 1961). A, scutum of lectotype; B, anterior part of idiosoma, ventral aspect, of paralectotype ZMMU Tdt-3176 (specimen 4). Schoutedenichia alongensis Schluger, Grochovskaja, Ngu, Hoe and Tung, 1960 [syn. of S. centralkwangtunga (Mo, Chen, Ho and Li, 1959)]. C, scutum of paralectotype ZMMU Tdt-3279 (specimen 4); D, dorsal aspect of idiosoma of lectotype; E, ventral aspect of idiosoma of lectotype. Scale bars: 50 μm (A, C), 100 μm (B, D, E).

FIGURE 28. Schoutedenichia alongensis Schluger, Grochovskaja, Ngu, Hoe and Tung, 1960 [syn. of S. centralkwangtunga (Mo, Chen, Ho and Li, 1959)]. A, arrangement of dorsal idiosomal setae of paralectotype ZMMU Tdt-3279 (specimen 4); B, arrangement of ventral idiosomal setae of paralectotype ZMMU Tdt-3279 (specimen 4); C, dorsal idiosomal seta of 1st row of lectotype; D, preanal seta of lectotype. Scale bars: 100 μm (A, B), 20 μm (C, D).

FIGURE 29. Schoutedenichia alongensis Schluger, Grochovskaja, Ngu, Hoe and Tung, 1960 [syn. of S. centralkwangtunga (Mo, Chen, Ho and Li, 1959)], lectotype. A, ventral aspect of gnathosoma; B, dorsal aspect of gnathosoma; C, leg I (trochanter– tarsus); D, leg II (trochanter–tarsus); E, leg III (trochanter–tarsus). Scale bars: 20 μm (A, B), 50 μm (C–E).

FIGURE 30. Type specimens of Schoutedenichia alongensis Schluger, Grochovskaja, Ngu, Hoe and Tung, 1960 [syn. of S. centralkwangtunga (Mo, Chen, Ho and Li, 1959)] on slides.