African chiggers (Acariformes: Trombiculidae) in the collection of Alex Fain, with a description of a new genus and three new species Author Stekolnikov, Alexandr A. Zoological Institute, Russian Academy of Sciences, Universitetskaya embankment 1, St. Petersburg text Acarologia 2018 2018-02-13 58 2 265 286 http://dx.doi.org/10.24349/acarologia/20184240 journal article 8383 10.24349/acarologia/20184240 5ae83f46-d196-4ea8-a7a0-621a73e6c9ec 2107-7207 4502371 A244F97F-8CEB-40CE-A182-7E5440337CAA Makwacarus petrodromi n. sp. ( Figure 3 ) Zoobank: B86036E9-29DB-4F68-867B-E65139D64BC0 Diagnosis — SIF = 6B-B-3-2111.0000; fsp = 7.7.7; fCx = 1.1.1; fSt = 2.2; fPp = B/B/BBB; fSc: AL>= PL ≫ AM; Ip = 729 – 733; fD = 2H-8-6-6(9)-6(8)-7-…; DS = 42 – 45; VS = 42 – 45; NDV = 87. Standard measurements of holotype and paratype : AW 59, 57; PW 65 , 60 ; SB 22, 23; ASB 27, 26; PSB 16, 18; SD 43, 44; P-PL 22, 23; AP 18, 18; AM -, 29; AL 59, 59; PL 57, 54; S 27, 25; H 51, 50; D min 32, 32; D max 47, 46; V min 22, 18; V max 36, 31; pa 256, 261; pm 214, 214; pp 263, 254; Ip 733, 729; DS 42, 45; VS 45, 42; NDV 87, 87; TaIIIL 69, 70; TaIIIW 16, 15. Description (larva) Idiosoma — Eyes 2 + 2. One pair of humeral setae, 40 – 43 dorsal idiosomal setae arranged in holotype 8-6-6-6-7-4-3, in paratype 8-6-9-8-7-5; four sternal setae; 42 – 45 ventral setae; total number of idiosomal setae excluding coxal and sternal 87. All idiosomal setae covered by large protruding barbs, barbs of preanal ventral setae thinner. Gnathosoma — Cheliceral blade with tricuspid cap; gnathobase with one pair of branched setae and sparse puncta; galeal setae with long branches; palpal claw with 3 prongs; palpal femoral, genual, and tibial setae with long branches; palpal tarsus with 6 branched setae and basal tarsala. Scutum — Nearly pentagonal, wider than long, without puncta, with broadly rounded posterior margin; AM situated slightly posterior to level of ALs; SB situated clearly posterior to level of PLs (P-PL – PSB = 5 – 6); AL> PL ≫ AM; all scutal setae similar to dorsal idiosomal setae; sensilla globose, covered by small cilia. Legs — All legs 7-segmented, with 1 pair of claws and claw-like empodium. Leg I: coxa with 1 non-specialized branched seta (1B); trochanter 1B; basifemur 1B; telofemur 5B; genu 4B, 2 genualae in distal half of segment, microgenuala at level of genualae; tibia 8B, 2 tibialae, microtibiala; tarsus 22B, tarsala 13 long, microtarsala near and slightly posterior to tarsala, subterminala, parasubterminala, pretarsala. Leg II: coxa 1B; trochanter 1B; basifemur 2B; telofemur 4B; genu 3B, genuala; tibia 6B, 2 tibialae in distal half of segment, not in tandem; tarsus 16B, tarsala 16 long, microtarsala behind tarsala, pretarsala. Leg III: coxa 1B; trochanter 1B; basifemur 2B; telofemur 3B; genu 3B, genuala; tibia 6B, tibiala; tarsus 15B. Host — Petrodromus tetradactylus tordayi Thomas ( Macroscelidea : Macroscelididae ). Type material — larva holotype ( IRSNB ) from P. tetradactylus tordayi , DR CONGO, Makwa , 3°28′52′′S , 17°31′47′′E , collected by A. Fain ; larva paratype with same data . Figure 3 Makwacarus petrodromi n. gen., n. sp. , larva: A – scutum and eyes; B – ventral preanal idiosomal seta; C – dorsal idiosomal seta of 1 st row (marginal); D – humeral seta; E – arrangement of ventral idiosomal setae; F – arrangement of dorsal idiosomal setae; G – dorsal aspect of gnathosoma; H – ventral aspect of gnathosoma; I – tarsus, tibia, and genu of leg I; J – tarsus, tibia, and genu of leg II; K – tarsus, tibia, and genu of leg III. Scale bars: A, I-K – 50 μm; B-D, G-H – 20 μm; E-F – 100 μm. Etymology — Species epithet derives from generic name of the host. Remarks — Date of collection is unknown. There are two populated places with the name Makwa in DR Congo , according to the database of US National Geospatial Intelligence Agency, but the second one ( 4°16′20′′N , 28°07′00′′E ) does not fall within the known distribution range of P. tetradactylus according the IUCN Red List of Threatened Species http(://dx.doi.org/10. 2305/IUCN. UK .2015-2.RLTS.T42679A21290893.en).