Dissoloncha Falconer, 1923

Emberson, Rowan M., 2010, A reappraisal of some basal lineages of the family Macrochelidae, with the description of a new genus (Acarina: Mesostigmata), Zootaxa 2501, pp. 37-53 : 40

Dissoloncha Falconer, 1923

Macrocheles (Dissoloncha) Falconer, 1923: 151 . Type species: Macrocheles superbus Hull, 1918 , by original designation and monotypy.

Geholaspini with a distally bifid, elongate, triangular epistome ( Fig. 1 ); ventri-anal shield with three pairs of pre-anal setae; inguinal pores on anterior lateral angles of ventri-anal shield ( Fig. 2 ); with two pairs of postepigynal platelets, these sometimes more or less fused to ventri-anal shield; sacculus large, spherical, strongly convoluted ( Fig. 3 ). Males with separate sternogynal and ventri-anal shields; chelicera with short, dorsally directed spermatodactyl; legs II with small spurs on femora and genua, legs IV with spurs on trochanters and femora.

Notes. Dissoloncha was redescribed by Hyatt & Emberson (1988) and associated with Geholaspis rather than Macrocheles . The unique spherical sacculus was illustrated by Takaku (1997). The genus needs no further description. It includes a single species distributed in coastal areas throughout the cool temperate regions of the Holarctic ( Krantz, 1972; Hyatt & Emberson, 1988; Takaku, 1997).

Included species: D. superbus ( Hull, 1918)

Figures

FIGURES 1 – 7. 1 – 3, Dissoloncha superbus (Hull), female. 1. Epistome; 2. Ventri-anal shield; 3. Sacculus complex. 4 – 5. Geholaspis longispinosus (Kramer), female. 4. Chelicera; 5. Epistome. 6. Longicheles hortorum (Berlese) comb. nov., female, chelicera with accessory teeth on external face. 7. Longicheles mandibularis (Berlese), female, epistome.