Macrocheles kekensis , Kontschan, Jeno, 2018

Kontschan, Jeno, 2018, Macrocheleskekensis sp. n., a new macrochelid mite associated with a centoniin beetle from Hungary (Acari, Mesostigmata), ZooKeys 768, pp. 97-104: 97-98

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Macrocheles kekensis

sp. n.

Macrocheles kekensis  sp. n. Figures 1-2, 3-7, 8-15


All dorsal setae pilose, except setae j1 and z1 which short and spine-like. Anterior and lateral parts of dorsal shield dotted, majority of dorsal surface with reticulate sculptural pattern.

Material examined.

Holotype. Female. Collected from Hoplia hungarica  Burmeister, 1844 Hungary, Kék village, 48°06'38"N, 21°52'51"E, 10 m a.s.l., 05 May 2017. Kontschán, J. coll. Paratypes. Two females, locality, date and host same as for holotype. The holotype and one paratype were deposited in the Soil Zoology Collections of the Hungarian Natural History Museum, Budapest, the other paratype in the Arachnida  collection of the Natural History Museum, Geneva, Switzerland.


Female. Dorsum (Figure 1). Shape of dorsal shield oblong, with length 440-460 and width 280-310 at level of the coxae II (n=3), micropunctation on anterior and lateral surface with reticulate sculptural pattern. Majority of setae on dorsal shield long and pilose in distal half, except setae j1 and z1 which are short, smooth and spine-like, and J5 with pilose margins for entire length. Length of dorsal setae: j1 and z1= 8-9, j2 = 22-24, j2, s2, Z2, Z5 and S5 = 24-26, j3, j4, j6, z2, z4, z5, z6, s4, s6, J2, Z1, Z4, S1, S2, S4 = 30-32, j5, s5, s6, r3, r3, r4 = 34-35, J5 = 16. Dorsal shield with four pairs of lyrifissures (close to z1, s6, S5 and between Z2 and S4), ten pairs of gland pores (close to j3, j4, s5, j6, z6, Z1, Z2, S4, Z4 and two close to J2), and four pairs of microspicules (close to r2, Z2, Z4 and Z5). Peritreme reaches the bases of setae z1.

Venter (Figure 2). Sternal shield 87-95 long and 100-110 wide at level of coxae II, bearing 3 pairs of needle-like setae and two pairs of lyrifissures. Posterior margin of sternal shield concave. Surface with linearly arranged punctures. Measurements of setae: St1 = 34-36, St2 = 30-32 and St3 = 26-28. Cuticle with a thin punctuation. Metasternal seta on metasternal platelet with length 20-23. Posterior margin of genital shield straight. Genital shield with length 75-78 and width 89-93. The length of seta on genital shield 23-26. Apodemes between ventrianal and genital shields absent. Ventrianal shield pentagonal with length 158-162 and width at level of Jv2 145-148, surface reticulated with linearly arranged punctures. Three pairs of ventrianal setae 22-25 long, needle-like, adanal setae needle-like and 22 long. Post-anal seta similar in shape and length to adanal setae. Opisthogaster bearing more than twelve pairs of slightly pilose setae (12-19 long). Sperm access system not visible.

Gnathosoma (Figures 3-7). Gnathosoma well developed. Deutosternal groove (Figure 3) with six rows of denticles, 3 pairs of hypostomal setae and one pair of palpcoxal setae present, all setae needle-like. Internal posterior hypostomal seta (h2) longer than others. Measurements of hypostomal setae: h1 = 27-30, h2 = 38-42, h3 = 18-25 and capitulate seta = 20-27. Tectum (Figure 5) with a pair of lateral processes and a bifurcated medial stem, margins of lateral processes and medial stem weakly serrate. Cheliceral fixed digit with apically serrate dorsal seta, four teeth (two smaller and two larger), pilus dentilis and terminal hook (Figures 6-7). On moveable digit large tooth and terminal hook present. Arthrodial brush with a short and a long branch and densely pilose. Length of fixed digit 52-55, moveable digit 41-44. Palp 164-170 long, palp trochanter with one smooth and one apically serrate ventral setae, other setae on palp smooth, palp apotele three-tined (Figures 3-4).

Legs (Figures 8-15). Tarsi II–IV with well-developed ambulacra and claws, claws and ambulacrum is missing from the tip of leg I. All setae simple on legs. Leg chaetotaxy typical for the genus. Length of legs: I 325-370, II 250-320, III 240-260, IV 380-420. Coxal glands not visible.


The name of the new species refers to the village ( Kék, East-Hungary) where the species was collected.