Hypogastia stekolnikovi Kaluz

Kaluz, Stanislav, Hung, Nguyen Manh, Capek, Miroslav & Literak, Ivan, 2016, Two new species and new records of chiggers (Acari: Leeuwenhoekiidae, Trombiculidae) from birds in Vietnam, Zootaxa 4061 (5), pp. 483-503 : 496-499

Hypogastia stekolnikovi Kaluz sp. nov.

( Figs. 10–14 )

Material examined. Holotype: Location A: Larva from Larvivora sibilans ( Passeriformes : Muscicapidae ); 1 February 2010. Paratypes: Location A: Seven larvae from Niltava davidi ( Passeriformes : Muscicapidae ); 3 February 2010.

Type depositions. Holotype and 2 paratypes will be deposited in SNM, 3 paratypes in IEBR VAST, and 2 paratypes in BMHN.

Etymology. The new species is named in honour of Dr. Alexandr A. Stekolnikov (Saint Petersburg, Russia) for his great contribution to taxonomy and ecology of chiggers.

Description. Larva (n=8). SIF = 7B.B.3.3111.3100; fsp = 7-7-7; fPp = B.B.BNB; Ga = B; Pc = 3; fSc = AL> PL> AM; SB//PL; fCx = 1.1.1; fSt = 2.2; fD = 2H+(8-9).6.6.4.4.2.2 = 34–35; DS = 34–35; VS = 36; NDV = 70; Ip = 914.

Idiosoma ( Figs. 10–12 ). Scutum nearly as wide as long, bearing AM, AL, PL setae and distally expanded (rounded) sensilla (20 long, 19 wide). Anterior margin of scutum sinuous with “shoulders”, lateral margins slightly conical. Scutal ridge present connecting both bases of sensilla. Posterior part of scutum partially submerged beneath the cuticular striae of dorsum. Posterior striae create concentric pattern in each of lateral halves of scutum, striae reach medially up to scutal ridge. Relatively large scutal puncta spread and cover nearly whole scutum in addition to small area posterior to bases of sensilla. Rounded eyes (2 + 2) in ocular plate, anterior eye larger than posterior. Humeral setae 50 (48–53) long, dorsal setae 43 (39–46) long, arranged in regular rows, posterior rows slightly varying in position of setae. Scutal measurements: AW 56 (51–60); PW 72 (68–77); SB 45 (42–49); ASB 23 (20– 26); PSB 31 (29–35); SD 54 (49–61); P-PL 9 (8–11); AP 38 (36–42); AM 42 (40–43); AL 53 (48–60); PL 49 (46– 56); S 21/19; H 50 (48–53). Ciliated dorsal setae arranged in rows, the length of setae varying from anterior 44 (42–46) through median 40 (37–42) to posterior 37 (34–40). Sternal side with two pairs (fSt = 2.2) of sternal setae 33 (31–36), fCx = 1.1.1. Ventral side with 36 irregularly arranged ciliated setae. Lengths of ventral setae vary from anterior 32 (27–38) to median 31 (28–32) and posterior 33 (26–37).

Gnathosoma ( Fig. 13 ). Galeala barbed (Ga = B). Palps 68 (66–71) long, palpotibial claw 17 (14–21) long with 3 deeply indented prongs. Chelicera anteriorly with tricuspid cap.

Legs ( Fig. 14 ). With pretarsus, claws and normal empodia. All setae on legs ciliated, slender. Specialized setae on leg segments—Leg I: Tarsus—S1 21, f1 2, nude pretarsala 10 (PT´= N), nude ST 21 and pST 18; 2 tibialae (anterior 16 and posterior 17), microtibiala 2, 3 genualae—anterior 16, median 16 and posterior 14, microgenuala 3; Leg II: Tarsus—nude pretarsala 12 (PT´´= N), S2 18, f2 2, 2 tibialae—anterior 14, posterior 14, genuala 15; Leg III: 2 nude mastitarsalae, anterior 43 and posterior 40, in some specimens moreover one type-A mastitarsala closed to posterior nude one; tibiala 15 (in some specimens, moreover, one type-A mastitibiala 36 long with 2–3 cilia in basal half) and genuala 17. Number of barbed setae on leg segments (leg formula from coxa to tarsus): Leg I: 1-1- (1+5)- 4-8-20; Leg II: 1-1-(2+4)- 3-5-16; Leg III: 1-1-(2+3)- 3-5-14. Length of tarsi I–III: I—83 (77–85), II—67 (63–71), III—85 (80–89). Width of tarsi I –III: I—18 (18–20); II—17 (16–18); III—17 (17–18). Leg length: pa = 320 (297–336); pm = 268 (255–278); pp = 312 (301–324); Ip = 899 (868–938).

Differential diagnosis. The new species is very similar to Hypogastia fullbergae Brennan, 1948 but differs from it by fPp = B.B.BNB, DS = 34–35; VS = 36; NDV = 70 and by longer legs (Ip = 899 [868–938]); while H. fullbergae has fPp = B.B.NBB; DS = 30; VS = 28; NDV = 58; and shorter legs (Ip = 718–811). Hypogastia stekolnikovi sp. nov. also resembles the species Hypogastia xiaguanensis Yu, Hu and Zhang, 1983 , but differs from it by fPp = B.B.BNB, Ga = B, fSc = AL ˃ PL ˃ AM and longer legs, while H. xiaguanensis has fPp = B.B.NNB, Ga = N; fSc = PL ˃ AM ˃ AL and shorter legs (Ip = 737).

Figures

FIGURE 10. Hypogastia stekolnikovi sp. nov. (holotype) — idiosoma dorsal. Scale bar: 100 µm.

FIGURE 11. Hypogastia stekolnikovi sp. nov. (holotype) — idiosoma ventral. Scale bar: 100 µm.

FIGURE 13. Hypogastia stekolnikovi sp. nov. (paratype) — gnathosoma (left—ventral, right—dorsal). Scale bar: 100 µm.

FIGURE 14. Hypogastia stekolnikovi sp. nov. (paratype) — legs I – III (dots—bases of setae; filled dots—upper side; empty dots—bottom side. Numbers—lengths of solenidia and famuli. Scale bar: 100 µm.