Teutonia (Subteutonia) minor, Tuzovskij, Petr V. & Semenchenko, Ksenia A., 2009

Tuzovskij, Petr V. & Semenchenko, Ksenia A., 2009, New water mites species (Acariformes: Hydrachnidia) from the Far East of Russia, Zootaxa 2241, pp. 1-21 : 5-10

Teutonia (Subteutonia) minor sp. n.

( Figs. 9–23 )

Type series. Holotype: male (228-kas– IBSS), Russia, Primory Territory, Anuchinsky District, the Arsenyevka River basin, the Konny spring, N 43°41.093’; E 133°59.927’; depth 10–30 cm; substrates: pebbles, mediumgrained sand, detritus, 14.09.2008, leg. K.A. Semenchenko, D.A. Sidorov. Paratypes: 1 male (190-kas– IBSS), 1 deutonymph (191-kas– IBSS), Russia, Primory Territory, Kavalerovsky District, Sea of Japan basin, small pond, connected with the Vysokogorskaya River, N 44°18.464’; E 135°09.962’; depth 30–60 cm; substrates: stones, detritus, 25.09.2008, leg. K.A. Semenchenko, D.A. Sidorov; 1 female (181-kas– IBSS), Russia, Primory Territory, Terneysky District, Sea of Japan basin, small pond near the Dzhigitovka River, N 44°50.107’; E 136°12.223’; depth 60 cm; substrates: stones, medium-grained sand, detritus, 25.09.2008, leg. K.A. Semenchenko, D.A. Sidorov.

Description. Male. Body rounded. Integument soft, with fine strips. The number and position of idiosomal setae and lyriform organs typical for the genus Teutonia . Setae Fch ( Fig. 9 ) longer and thicker than other idiosomal setae. Trichobothria Fp and Oi without glandularia, other dorsal setae associated with glandularia. Eye lenses not in capsules, in anterolateral position on each side, anterior lenses larger than posterior ones.

Coxae of legs ( Fig. 10 ) incorporated into four groups and occupy about half of idiosomal length, their total length much shorter than its width. First two pairs of coxae with well developed apodemes, coxae III with short median apodemes. Median margins of coxae IV straight or slightly concave, almost twice longer than those of coxae III. Posterior margins of coxae IV straight or slightly concave. Medial and posterior margins of coxae IV joined at an obtuse angle. Setae Pe with associated glandularia placed on coxae IV and completely surrounded by its sclerotization. Setae Hv situated free laterally between anterior and posterior coxal groups on each side.

Genital flaps tapering anteriorly, with 12–18 median and 5 lateral setae. Anterior two pairs of acetabula approximately equal in size and slightly longer than the posterior pair. Total length of all acetabula on each side smaller than length of genital flaps. Pregenital sclerite shorter than postgenital sclerite. Ejaculatory complex ( Figs. 11–12 ) with well developed distal and proximal arms; distal arms directed sideways; proximal arms curved, directed along centroidal axis of ejaculatory complex; proximal horn with curved lateral sides. Setae Pi without accompanying glandularia, situated near posterior genital sclerite. Excretory pore without sclerotization, located caudally between setae Ci.

Basal segment of chelicera with convex dorsal and slightly concave ventral side ( Fig. 13 ). Cheliceral stylet crescent-shaped, its terminal part pointed with two rows of fine dorsal teeth.

Capitulum ( Fig. 14 ) with relatively short rostrum, with two pairs of setae, dorsal setae longer than ventral ones. Trochanter of pedipalp ( Fig. 14 ) without setae. Pedipalpal femur with nearly straight ventral and convex dorsal margin, length of ventrodistal seta two thirds of its ventral margin. Femur with eight short dorsal setae. Pedipalpal genu with one extremely long ventrodistal seta, reaching to the end of tibia, and five dorsal setae. Ventral margin of pedipalpal tibia straight, the dorsal margin slightly convex. One peg-like seta situated in the middle of tibia, several setae on its dorsal and ventral margin, mainly in ventrodistal part. Pedipalpal tarsus ( Fig. 15 ) with proximal solenidion, five thin setae and four stout distal spines.

Legs III–IV with long swimming setae (Fig. 16), with the following numbers: 3 on telofemur, 7–8 on genu, 6–7 on tibia of leg III; 8 on telofemur, 10–11 on genu, 8–10 on tibia of leg IV.

Claws (Fig. 17) with well developed blade, one short interior and one long exterior clawlets, both clawlets with acute apex. Ventral margin of claw blade convex. Legs IV without claws, bearing two short setae-like structures at tip of tarsus.

Measurements (n=2). Length of body 720–730; length of seta Fch 108–113; length of coxal shield 376– 383, width 580–653; length of genital flaps 330–336, width 56–61; length of genital acetabula (Ac. 1–3): 54– 60, 58–64, 40–41; length of capitulum 160–165; length of basal segment of chelicera 173–177, length of cheliceral stylet 38–40; length of pedipalpal segments (P-1–5): 24–27, 92–95, 85–98, 160–163, 42–44; length of ventrodistal seta on P-3 130–148; length of leg segments: I-L- 1–6 – 51 –55, 85–92, 115–120, 160–163, 181–184, 198–204; II-L- 1–6 – 65 –71, 92–95, 126–129, 177–184, 197–198, 202–210; III-L- 1–6 – 74 –78, 95– 97,139–143, 197–199, 207–209, 207–210; IV-L-1–6 – 122–126, 117–122, 160–166, 214–218, 238–241, 238– 265.

Female. Similar to male but larger. Coxae of legs (Fig. 18) occupying more than half of ventral surface. Genital sclerites almost subequal in size at female, with 19–22 median and 4–5 lateral setae. Lyriform organs larger than in males, also slit-like (Fig. 19). Differentiation of lyriform organs (i5), located in profile, into two sections well observed (Fig. 18). Legs III–IV with long swimming setae, with the following numbers: 4 on telofemur, 10 on genu, 10 on tibia of leg III; 8 on telofemur, 15 on genu, 12 on tibia of leg IV.

Measurements (n=1). Length of body 850; length of seta Fch 150; length of coxal shield 508, width 778; length of genital flaps 224, width 71; length of genital acetabula (Ac. 1–3): 78, 75, 54; length of capitulum 211; length of basal segment of chelicera 237, length of cheliceral stylet 54; length of pedipalpal segments (P- 1–5): 30, 119, 115, 224, 54; length of ventrodistal seta on P-3 214; length of leg segments: I-L- 1–6 – 78, 119, 153, 214, 241, 250; II-L- 1–6 – 75, 125, 170, 248, 265, 257; III-L- 1–6 – 92, 125,187, 278, 289, 302; IV-L-1–6 – 180, 190, 217, 299, 357, 340.

Deutonymph. Dorsum similar to that of adults ( Fig. 20 ). Coxae of legs ( Fig. 21 ) occupying less than half of ventral surface. First two pairs of coxae with well developed apodemes. Median and posterior margins of coxae IV with sclerotization. Posterior margins of coxae IV slightly concave. Setae Pe with associated glandularia placed on coxae IV and completely surrounded by its sclerotization.

Genital flaps narrow, with fused anterior and posterior ends. Genital acetabula almost subequal in size. Excretory pore without sclerotization.

FIGURES 16–19. Teutonia minor sp. n., male (16–17) and female (18–19): 16, leg IV; 17, claw of leg I; 18, idiosoma, ventral view; 19, lyriform organ i4. Scale bars = 100 μm for Figs. 16, 18; 25 μm for Figs. 17, 19.

Trochanter of pedipalp without setae. Pedipalpal femur ( Fig. 22 ) without ventral setae, with straight ventral and convex dorsal margin, bearing four setae on dorsal surface. Pedipalpal genu with one extremely long ventrodistal seta, reaching to the middle of tibia, and one dorsal seta. One peg-like seta on pedipalpal tibia situated in two thirds of tibia, several setae on its dorsal and ventral margin, mainly in distal part. Pedipalpal tarsus with proximal solenidion, three thin setae and four stout distal spines.

Legs III–IV with long swimming setae ( Fig. 23 ), with the following numbers: 3 on genu, 4 on tibia of leg III; 2 on telofemur, 7 on genu, 8 on tibia of leg IV.

Measurements (n=1). Length of body 600; length of seta Fch 102; length of coxal shield 231, width 418; length of genital flaps 65, width 51; length of genital acetabula (Ac. 1–2): 27, 25; length of capitulum 102; length of basal segment of chelicera 117, length of cheliceral stylet 30; length of pedipalpal segments (P-1–5): 15, 54, 61, 95, 30; length of ventrodistal seta on P-3 56; length of leg segments: I-L- 1–6 – 41, 47, 68, 98, 108, 129; II-L- 1–6 – 44, 54, 75, 105, 119, 132; III-L- 1–6 – 47, 58, 82, 116, 129, 143; IV-L- 1–6 – 82, 71, 98, 143, 160, 177.

Differential diagnosis. Teutonia minor sp. n. belongs to the subgenus Subteutonia Habeeb, 1958 , with two species, T. setifera Habeeb, 1958 from Canada and T. piloseta Guo & Jin, 2005 from China. The new species is more closely related to T. setifera , described only on the base of male, and differs from this species in the following characters (character states of T. setifera are indicated in parentheses from Habeeb 1958): smaller length of body 720–730 (1150–1220) and length of other details in males; fewer setae on genital flaps: 12–18 median and 5 lateral setae (27–31 median and 3 lateral setae); ejaculatory complex with distal arms directed sideways and proximal horn with curved lateral sides (distal arms directed along centroidal axis of ejaculatory complex; proximal horn straight); length of ventrodistal seta on pedipalpal femur is two thirds of its ventral margin (subequal to ventral margin of pedipalpal femur); thin setae on tibia situated in distal as well as proximal parts (only in distal part). Teutonia minor sp. n. can be distinguished from T. piloseta by the following features (character states of T. setifera are indicated in parentheses from Guo & Jin 2005): smaller length of body 720–730 (1099) in males and 850 (1119) in females; posterior margin of coxae IV is longer than its medial margin (posterior and medial margins are almost of equal length); setae Pe with associated glandularia completely surrounded by sclerotization of coxae IV (open medially); length of ventrodistal seta on pedipalpal femur is two thirds of its ventral margin (one thirds of ventral margin); ventrodistal seta on pedipalpal genu is of equal length with tibia segment (longer than tibia).

Etymology. The species epithet minor is Latin for “smaller” as two other species from the subgenus Subteutonia are much larger than the new species.

Habitat. Running and standing waters.

Distribution. Primory Territory, Far East of Russia.

Figures

FIGURES 9 – 10. Teutonia minor sp. n., male: 9, idiosoma, dorsal view; 10, idiosoma, ventral view. Scale bar = 100 μm.

FIGURES 11 – 15. Teutonia minor sp. n., male: 11, ejaculatory complex, anterior view; 12, ejaculatory complex, lateral view; 13, chelicera; 14, hypostomal plate with pedipalp; 15, pedipalpal tarsus. Scale bars = 50 μm for Figs. 11 – 14; 25 μm for Fig. 15.

FIGURES 20 – 23. Teutonia minor sp. n., deutonymph: 20, idiosoma, dorsal view; 21, idiosoma, ventral view; 22, pedipalp; 23, tibia and tarsus of leg IV. Scale bars = 100 μm for Figs. 20 – 21; 50 μm for Fig. 23; 25 μm for Fig. 22.