Didelphialges, Bochkov, OConnor & Grootaert, 2013

Grootaert, Patrick, 2013, Revision of the family Listropsoralgidae Fain, 1965 (Acariformes: Sarcoptoidea) - skin parasites of marsupials and rodents 3611, Zootaxa 3611 (1), pp. 1-69 : 63-66

Genus Didelphialges gen. n.

Type species: Didelphialges metachirus sp. n., designated here.

Description. Subcapitulum ventrally without medially positioned retrorse spurs. Propodonotal and hysteronotal shields with ornamentation. Setae c1 absent; cp and c3 narrowly lanceolate; d1 present; h1 absent; h2 whip-like; ps1 present. Coxal fields I without lateral projections. Tibiae I and II with additional retrorse ventroantiaxial spur. Genua I and II without ventro-antiaxial retrorse projection. Setae la I and II present.

MALE. Genital papillae present. Setae f thickened; ps1 filiform, g flanking aedeagus. Opisthosomal lobes absent. Dorsal sclerite of aedeagus without posterior projections. Setae s III present, e IV absent. Genua III and tibiae III with ventro- paraxial keel along full length of respective segment. Ambulacra of tarsi IV present.

FEMALE. Unknown.

Etymology. The species name is derived from the family name of the host.

Differential diagnosis. This new genus is most close to the genus Listropsoralgoides . In males of the both genera, the genital papillae, setae d1 and s III are present, and setae c1 are absent. Males of these genera differ from each other by the following characters. In Didelphialges gen. n., genua III are with the membranous projection, tibiae III are with well developed ventro-antiaxial projection, setae h2 are whip-like (longer than the hysteronotal shield), the spurs on coxal fields I and III are absent. In Listropsoralgoides , the projections on genua III and tibiae III are absent, setae h2 are relatively short (about 3 times shorter than the hysteronotal shield), the spurs on coxal fields I and III is present.

The new genus differs from the Petauralges by the following characters. In Didelphipsoralges, the ventral median spurs of the subcapitulum are absent, setae se are microsetae, setae h1 are absent, setae e IV are filiform, genua III and tibiae III are with the ventro-paraxial projection, and pretarsi IV are present. In Petauralges , the ventral median spurs of the subcapitulum are present, setae se are long, much longer than si, setae h1 are present, setae e IV are sucker-like, genua III and tibiae III are without projections, and pretarsi IV are absent.

The new genus differs from Listropsoralges by the presence of the genital papillae and setae d1, s III, and by the absence of setae h1. In Listropsoralges , the genital papillae, setae d1, and s III are absent, and setae h1 are present.