Samsinakia charanasriae, Fuangarworn & Lekprayoon, 2010

Fuangarworn, Marut & Lekprayoon, Chariya, 2010, Two new species of cheyletid mites (Acari: Prostigmata) from Thailand, Zootaxa 2494 (1), pp. 59-68 : 64-67

Samsinakia charanasriae n. sp.

( Figs. 4–6 )

Female (Holotype and three paratypes). Gnathosoma ( Figs. 5A, B ) — 79 (75–80) long, 78 (77–80) wide, mostly covered by anterior margin of prodorsum. Peritreme arch-like with 5 pairs of segments. Tegmen and protegmen covered with longitudinal striae. Triangular projections present at anterior lateral margin of protegmen. Rostral tip with two pairs of adoral setae, or1 and or2. Setae n present on gnathobase, being smooth and filiform. Palpal femur 36 (33–38) long and 36 (32–38) wide. Setae dF fanlike with truncated tip, setae dG, l”G and v”F fanlike, setae v’F straplike with pointed tip. All these setae roughly barbed. Setae dT and l”T rod like and roughly barbed. Setae l’T smooth and filiform. Palp claw with one basal tooth. Palpal tarsi dorsally with two comb-like eupathidia, amc and sul, ventrally with setae ul’ and ul”, and solenidion ω.

Idiosoma ( Figs. 4A, B ). Dorsum ( Fig. 4A ) — Subhexagonal in dorsal aspect, 255 (250–258) long, 199 (195–205) wide, with two dorsal shields. Propodonotal shield 119 (113–125) long, bearing small eyes and four pairs of lateral fanlike setae (vi, ve, sci and sce) and about 21 pairs of median platelike setae, being polygonal and granulate ( Fig. 4C ). Hysteronotal shield with 6 pairs of lateral setae (c1, d2, e2, f2, h1 and h2). Setae c1, d2, e2 and h1 fanlike; setae f2 and h2 straplike, and with about 27 pairs of median setae, similar to those on propodonotal shield. Setae c2 fan-like, situated ventrally on oval sclerotized plates. Venter ( Fig. 4B ) — Setae ag1–ag3 present, smooth and filiform. Setae g1 and g2 present, filiform. Setae ps1– ps3 present, setae ps1 and ps3 filiform, setae ps2 fan-like. Coxal setation: 2 - 1 - 2 - 2. Coxal setae filiform and smooth except for setae 3b, fan-like.

Legs ( Figs. 6A–D ). — Leg I 126 (125–128) long; leg II 98 (90–100) long; leg III 105 (100–108) long; leg IV 109 (100–113) long. Setation of legs I–IV (solenidion in brackets) as follows: trochanter 1 - 1 - 2 - 1; femur 2 - 2 - 2 - 1; genu 2(1) - 2 - 2 - 2; tibia 4(1) - 4 - 4 - 4; tarsi 8(1) - 7(1) - 7 - 7. Shape of setae on leg I as follows: v’Tr fan-like; dFe straplike, v”Fe fan-like; dGe and l’Ge fan-like; dTi and l”Ti fan-like, v’Ti thick filiform, v”Ti fan-like; ftTa fan-like, (tc)Ta filiform with microbarbs, (p)Ta filiform, (u)Ta filiform and ciliate, vsTa fan-like with 7–8 branches. Solenidia σ and φ short, rodlike, ω 1 elongate rodlike. Leg II: v’Tr fan-like; dFe serrated filiform, v”Fe fan-like; dGe and l’Ge fan-like; dTi fan-like, l’Ti and v’Ti straplike, v”Ti fan-like, (tc)Ta, (p)Ta and (u)Ta filiform, vsTa with 4 or 5 branches; Solenidion ω 1 on ventral surface of tarsi II. Leg III: v”Tr fan-like, l”Tr straplike; dFe straplike, v”Fe fan-like; dGe straplike, l”Ge fan-like; dTi and l’Ti fan-like, v’Ti serrated filiform, v”Ti straplike; (tc)Ta filiform, (p)Ta and (u)Ta serrated filiform, vsTa fan-like with 3 or 4 branches. Leg IV: v”Tr fan-like; dFe and dGe straplike, l”Ge fan-like; dTi straplike, l’Ti fan-like, v’Ti filiform, v”Ti straplike; (tc)Ta filiform, (p)Ta and (u)Ta serrate filiform, vsTa fan-like with 2 or 3 branches. Claws of legs I– IV normal, subequal.

Male and immatures. Unknown.

Type materials. Holotype female (CUMZ-AC-2009.07). Buang-Chawak Park, Supan Buri Province ; ex. litter under Flacourtia sp. , 3 m. from pond edge; 28. III. 2003; leg. M. Fuangarworn (Field no. MF 2003-56). Three female paratypes (CUMZ-AC-2009.08 – 10) with same data as the holotype. Type deposition – The holotype and two paratypes are deposited in the Acarology collection at Chulalongkorn University Museum of Natural History , Bangkok, Thailand. One female paratype will be deposited in the Acarology collection at the Ohio State University, Columbus, USA.

Etymology. This species is named in honor of Mrs. Vatana Charanasri, former acarologist of the Department of Agriculture, Ministry of Agriculture and Cooperation, for her contribution to Acarology in Thailand.

Remarks. Currently, the genus Samsinakia includes seven species described from the Philippines, India, Madagascar, Rawanda, Zaire and Mexico ( Fain 1980; Fain & Bochkov 2001; Bochkov & Klimov 2005). This is the first report of this genus in Thailand and brings the world fauna to eight species. S. charanasriae n. sp. is similar to S. theodoridis (Samsinak, 1959) in having the following characters: Coxal setation is 2 - 1 - 2 - 2; setae e2 (= setae l3) are present; and guard setae ft on tarsi I is fan-like. However, the former can be readily distinguished from the latter by, among others, the presence of fan-like dorsolateral setae (vs. cylindricoconical in S. theodoridis ) and the presence of one basal tooth on the palpal claw (vs. three in S. theodoridis ).

Figures

FIGURE 4. Samsinakia charanasriae n. sp., female. A—Dorsal view, median setae shown by their alveoli; B—Ventral view; C—Detail of dorsal setae.

FIGURE 5. Samsinakia charanasriae n. sp., female. A—Gnathosoma in dorsal view; B—Same in ventral view.

FIGURE 6. Samsinakia charanasriae n. sp., female. A–D—Legs I– IV, respectively, in latero-ventral view.