Micridium foveatum, Darby, Michael, 2017

Darby, Michael, 2017, Taxonomic review of the genera Micridium Motschulsky, 1869 and Micridina Johnson, 1969 (Coleoptera: Ptiliidae) with eleven new species including the first records from South America and Madagascar, Zootaxa 4242 (2), pp. 233-254 : 242

Micridium foveatum sp.n.

( Figs. 13, 21, 40, 46, 59, 64, 75, 85, 91, 102)

Habitus Fig. 13. Length 0.64 mm. Colour dark brown, pubescence, antennae and legs dusky yellow. Length of antennomeres 3–11 0.24 mm, antennomere 11 with branched sensillae, Fig. 46. Width across eyes 0.18 mm. Mentum: sides almost parallel expanded laterally at anterior corners, submentum with 3 setae, Fig. 40. Pronotum without linear depressions but with two groups of large setal depressions (numbers and positions slightly variable between specimens and some with a few scattered centrally) length 0.16 mm, width 0.22 mm, Fig. 21. Elytra length 0.42 mm, width 0.28 mm. Mesoventrum: keel narrow between mesocoxae, splitting anteriorly into two short projections which reach half way to the collar; collar with a small semicircular cap medially placed on the anterior margin and a medially placed bifid posterior projection, Fig. 59. Mesepiventra without reticulation, sinuate in posterior half with rounded hind angles. Metaventrum: metepiventral sutures short reaching +/– 1/4 length of the sclerite, Fig. 64. Pygidium with a sharp apical point Fig. 102. Wings of usual ptiliid type.

Male: posterior intercoxal process of metaventrum with a fringe of 8 flattened setae extending posteriorly beyond the metacoxal plates. Aedeagus: shape difficult to interpret, Fig. 85.

Female: spermatheca Fig. 75.

Etymology. Named after the pronotal depressions.

Diagnosis. The form of the mesoventrum quickly distinguishes this species from all others.

Type data: Holotype: ♀, Chile, Llanquihue Pr., Lago Chapo , 13.5 km E Correntoso, site 656, Valdivian rainfor., window trap, 310m, 16–27.xii.1982, A. Newton & M. Thayer ( FMNH) . Paratypes: 16 examples, same data as holotype ( FMNH, BMNH) ; 3 examples, Chile, Valdivia Pr., 4.1km W Anticura, trap site 663, Valdivian rainfor., window trap, 270m, 19–25.xii.1982, A. Newton & M. Thayer ( FMNH) ; 2 examples, Chile, Valdivia Pr., 4.1km W Anticura, trap site 663, Valdivian rain for., leaf litter on forest floor, 270m, 19–25.xii.1982, A. Newton & M. Thayer ( FMNH) ; 1 example, Chile, Osorno Pr., Parque Nac. Puyehue, Antillanca road, trap site 661, Valdivian rainfor., 690m, 18–24.xii.1982, A. Newton & M. Thayer ( FMNH) ; 11 examples, Chile, Osorno Pr., Parque Nac. Puyehue, 4.1 km E Anticura, trap site 662, Valdivian rainfor., forest leaf and log litter, 430m, 19–26.xii.1982, A. Newton & M. Thayer ( FMNH, BMNH) .