Steganacarus (Rhacaplacarus) spinus Niedbała, 2014

Niedbała, Wojciech & Ermilov, Sergey G., 2014, Ptyctimous mites (Acari, Oribatida) from the Joint Russian-Vietnamese Biological Expedition (October 2013 – April 2014), Zootaxa 3884 (2), pp. 156-168 : 164-165

Steganacarus (Rhacaplacarus) spinus Niedbała sp. nov.

(Fig. 5A–I)

Description. Measurements of holotype. Prodorsum: length 220, width 152, height 88. Prodorsal setae: sensillus 28, in, le 20, ro 15. Notogaster: length 384, width 257, height 227. Notogastral setae: c 1, h 1, p 1 20. Plates: genitoaggenital 88 × 88, anoadanal 131 × 86. Measurements of paratype. Prodorsum: length 263, height 111. Notogaster: length 515, height 288.

Integument. Body strongly sculptured. Integument distinctly foveolate, foveoles in anterior part of prodorsum bigger than in posterior part.

Prodorsum with long, narrow sigillar fields, weakly visible in lateral aspect. Lateral carinae absent. Posterior furrows well developed. Sensilli short, with narrow stalk and rounded head, rough. Setae (except vestigial exobothridial) short, spinose, rough.

Notogaster with very short (c 1/ c 1– d 1=0.27), thick, spinose, rough setae. Setae c 1 and c 3 some distance from anterior margin, setae c 2 far from margin. Vestigial setae f 1 invisible. Two pairs of lyrifissures ia and im present.

Ventral region. Arrangement of genital setae: 7(4+3):2. Anoadanal plates with short, spinose setae, three at paraxial border and two adanal setae only slightly remote from border, setae ad 2 situated at level between anal setae.

Legs. Formulae of setae and solenidia of “complete type ”. Setae d on femora I a little remote from distal end of article.

Material examined. Holotype: locality 3; one paratype: locality 4.

Comparison. Only one oriental species of this subgenus, Steganacarus (Rhacaplacarus) spiniger (Aoki, 1980(a )) from Japan, has similar spinose setae, but distinguish from the new species by the presence of lateral carinae of prodorsum and longer sensilli with broadened head covered with spines in one side. Another one species with similar notogastral setae is know from Tanzania— S. (R.) spiniferus ( Mahunka, 1993) , but sensilli are sicle shaped on setae of anoadanal plates are longer (ad 1 and anal setae are longer than distance between them).

Etymology. The specific epithet is derived from Latin spine meaning “spike, thorn, barb” referring to the shape of body setae.

FIGURE 5 A–I. Steganacarus (Rhacaplacarus) spinus Niedbała sp. nov.: A, prodorsum, dorsal view; B, prodorsum, lateral view; C, opisthosoma, lateral view; D, interlamellar seta; E, seta c 1; F, left genitoaggenital plate: G, left anoadanal plate; H, trochanter and femur of leg I; I, tibia of leg IV.