Dewuacarus lemuensis Silva

Fuente, María Carolina Silva-De La, Casanueva, María Eugenia, Salas, Lucila Moreno & González-Acuña, Daniel, 2016, A new genus and species of chigger mite (Trombidiformes: Trombiculidae) from Loxodontomys pikumche (Rodentia: Cricetidae) in Chile, Zootaxa 4092 (3), pp. 426-430 : 427-429

publication ID 10.11646/zootaxa.4092.3.8

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Dewuacarus lemuensis Silva


Dewuacarus lemuensis Silva –de la Fuente sp. nov. ( Figs. 1–2 View FIGURE 1 View FIGURE 2 ).

Diagnosis. SIF = 7BS-N-3111.12110; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/B/BBB; fSc: AL> PL> PPL> AM; Ip = 1260–1280; DS = 58; VS = 70. Standard measurements of holotype: AW 104, PW130, PPW 95, SB 39, ASB 56, PSB 39, SD 95, AP 47, AM missing in holotype, AL 105, PL 91, PPL 86, S 97, H 88, D min 58, D max 91, V min 41, V max 69, pa 420, pm 410, pp 450. Others measurements are given in Table 1 View TABLE 1 .

Description LARVA (holotype; 4 paratypes). GNATHOSOMA. Porous; palpal setal formula B/B/BBB 7B.S; palpal claw three–pronged; galeala nude; cheliceral blade tricuspid, with tiny tooth at base.

IDIOSOMA. Cuticle striate except on scutum and coxae. Eyes 2/2 on ocular plate. Dorsum with 56 idiosomal setae, arranged in irregular rows; 1 pair of humeral setae (2H). Venter with 66 idiosomal setae (38 preanal and 28 postanal) and 2 pairs of sternal setae. All idiosomal setae heavily barbed.

SCUTUM. Porous; moderately rectangular; anterior margin slightly concave; lateral margins straight; posterior margin convex; 7 setae on scutum; AL base anterior to level of AM base; PL and PPL base posterior SB; AL> PL> PPL> AM; sensilla flagelliform, with slight distal branches; PW/SD = 1.51.

LEGS. All 7-segmented, with 1 pair of claws and without empodium. Leg I: coxa with 1 branched seta (1B); trochanter 1B; basifemur 1B; telofemur 5B; genu 4B, genuala and microgenuala; tibia 8B, 2 tibialae and microtibiala; tarsus 21B, tarsala, microtarsala proximal to tarsala, subterminala, parasubterminala and pretarsala present. Leg II: coxa 1B; trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala, without microgenuala; tibia 6B, 2 tibialae, without microtibiala; tarsus 16B, tarsala present, microtarsala proximal to tarsala, pretarsala present, without subterminala and parasubterminala. Leg III: coxa 1B; trocanter 1B; basifemur 2B; telofemur 3B, without mastifemorala; genu 3B, genuala; tibia 5B, tibiala and mastitibiala; tarsus 14B, 2 mastitarsalae. 2 claws present, without empodium on all legs. All measurements are given in Table 1 View TABLE 1 .

Remarks. The new genus Dewuacarus differs from Hoffmannina and Kaaia in lacking empodia on all legs, with only 1 genuala on leg I; 2 mastitarsalae and 1 mastitibiala on leg III.

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