Orthadenella Athias-Henriot, 1973

Gwiazdowicz, Dariusz J., Marchenko, Irina I. & Teodorowicz, Ewa, 2014, Description of Orthadenella coulsoni sp. nov. (Acari: Mesostigmata: Melicharidae) from Siberia with a key to the females of Orthadenella, Journal of Natural History 49 (27), pp. 1659-1671 : 1660-1661

Genus Orthadenella Athias-Henriot, 1973

Type species: Proctolaelaps (Neojordensia) lawrencei Evans, 1958 Synonyms : Lasioseius berlesei Oudemans sensu Westerboer ; Lasioseius frondeus Karg.

Diagnosis of genus

Dorsal side. Idiosoma with a holodorsal shield, 11 pairs of marginal r–R setae on edge of dorsal shield, the opisthonotal region of shield with 20 pairs of setae, seta z1 present.

Ventral side. One or two pairs of presternal platelets, sternal shield with three pairs of simple setae, one pair of metasternal platelets, ventrianal shield, one or two pairs of metapodal platelets, endopodal shields alongside coxae III–IV are strongly developed, and are contiguous or connected with the endopodal portions of the sternal shield alongside coxae II, peritrematal shields connected with a continuous, unfragmented exopodal strips alongside coxae IV; spermathecal apparatus with two branches of tubulus annulatus, unpaired sacculus foeminus, and narrow sperm duct; sacculus walls with many thin filaments or cylindrical protrusions.

Gnathosoma . Corniculi well separated, stout; deutosternal groove with rows, each with 2–6 denticles; movable cheliceral digit with three denticles, fixed digit with a ridge extending from paraxial surface to 3 denticles on proximoventral surface, bears a setiform pilus dentilis, instead of the modified hyaline process typical for the great majority of melicharids; epistome convex or triramous, denticulate.

Legs. Setation of trochanter I (6 setae), femora I (12), II (11), III (7), IV (6), genua I (13), II (11), III (9), IV (9), tibiae I (13), II (10), III (8), IV (9).