Trhypochthonius cladonicolus ( Willmann, 1919 )

Szywilewska-Szczykutowicz, Anetta & Olszanowski, Ziemowit, 2007, Redescription of C. Willmann’s Holarctic species of the genus Trhypochthonius (Acari: Oribatida: Trhypochthoniidae), Zootaxa 1406, pp. 17-24 : 18-19

Trhypochthonius cladonicolus ( Willmann, 1919)

( Figs. 1–7 )

Camisia cladonicola Willmann, 1919

Trilohmannia cladonicola ( Willmann) : Willmann 1923 Trhypochthonius cladonicola ( Willmann) : Willmann 1931

Description. Body length: 480–550 Μm (lectotype: 520 Μm); maximum body width: 240–300 Μm (lectotype: 270 Μm). Colour: light-brown.

Prodorsum ( Figs. 1–6 ). Integument porose. Rostrum rounded. All prodorsal setae smooth and pointed. Rostral setae 80 Μm, lamellar setae 70 Μm, interlamellar setae 90 Μm long. Sensilli about 50Μm long with distal ovate head with delicate spines distally ( Figs. 1–6 ).

Notogaster ( Figs. 1, 3 , 5, 7 ). Integument slightly granulated, surface with reticulate sculpture. All notogastral setae smooth, thin and pointed; anterior shorter than posterior. Length of setae: c1 12 Μm, c3 20 Μm, e1 35 Μm, h1 45 Μm. Vestigial alveoli of setae f1 situated anteriorly to insertions of setae h1 (distance h1–h1 approximately equal to f1–f1).

Ventral region ( Fig. 7 ). Anal and genital shields similar in length. Genital plates each with 8 pairs of setae; narrow anal plate with one seta, adanal plate with three setae. All ventral setae smooth. Material examined. Type material, Germany: two slides from the C. Willmann’s collection (Zoologische Staattsammlung Münich, Germany):

(1) Lectotype: ZSM 20044053. Slide labelled: “ Camisia Trhypochthonius cladonicola Willm. Prp. 330. Det. C. Willmann, 2. 5. 15. Katenbäker. Heide. (Wildeshausen)”; one specimen.

(2) Paralectotype: ZSM 20044054, slide labelled “ Camisia Trhypochthonius cladonicola Willm. Prp. 329. Det. C. Willmann, 2. 5. 15. Katenbäker. Heide. (Wildeshausen)”; one specimen.

Comparative material: Germany: one slide from the C. Willmann’s collection (Zoologische Staattsammlung Münich, Germany), ZSM 20044055, slide labelled “ Trhypochthonius cladonicola (Willm) ?. Det. C Willmann, Göldenitzer Moor. Mecklenburg.”, 13 specimens (slide dry, all specimens damaged in poor condition); Canada: Can. Nat. Collection., Nova Scotia Cape Breton H., N.P. Mica Mt. Trail, 7.09.1983, barrens, ex. lichen, Ledum , shrub Abies and Vaccinium , litter in moist hollow, coll. V. Behan [VB 118–83].

Remarks. The ventral region was described on the basis of the comparative material from Canada. The lectotype and other specimens in C. Willmann’s collection are preserved as permanent slides which makes observation of ventral characters with sufficient precision difficult.

Figures

FIGURES 1 – 4. Trhypochthonius cladonicolus (specimens from C. Willmann’s collection), lectotype (1 – 2) and paralectotype (3 – 4). (1) Dorsal view; (2) trichobothrium; (3) dorsal view; (4) trichobothrium. Scale: 1, 3 = 100 µm; 2, 4 = 300 µm.

FIGURES 5 – 7. Trhypochthonius cladonicolus (specimen from Canada). (5) Dorsal view; (6) trichobothrium; (7) ventral view. Scale: 5, 7 = 100 µm; 6 = 300 µm.