Micridium thayerae, 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 : 251

publication ID	https://doi.org/ 10.11646/zootaxa.4242.2.2
publication LSID	lsid:zoobank.org:pub:0DD1868D-4EF5-4FB7-AEE9-372644800A79
DOI	https://doi.org/10.5281/zenodo.6045229
persistent identifier	https://treatment.plazi.org/id/03E64B08-E33A-FFE6-8585-5B2DFC5EEE17
treatment provided by	Plazi
scientific name	Micridium thayerae
status	sp. nov.

Treatment

Micridium thayerae View in CoL sp.n.

( Figs. 14 View FIGURES 1 – 14 , 24 View FIGURES 17 – 32 , 41 View FIGURES 33 – 41 , 43 View FIGURES 42 – 46 , 54 View FIGURES 47 – 60 , 62 View FIGURES 61 – 71 , 79 View FIGURES 72 – 81 , 86a/b, 93)

Habitus Fig. 14 View FIGURES 1 – 14 . Length 0.70 mm. Colour brown, legs and antennae pale yellow, covered with long yellow overlapping pubescence. Antennomeres 3–11 length 0.22 mm, Fig. 43 View FIGURES 42 – 46 . Width across eyes 0.19 mm. Mentum almost square, the two long setae normally situated at the anterior corners are placed medially close to the lateral margins, submentum with 4 setae, Fig. 41 View FIGURES 33 – 41 . Pronotum without linear depressions but with clearly marked shallow pits at sides of disc in posterior half, length 0.17 mm, width 0.26 mm, Fig. 24 View FIGURES 17 – 32 . Elytra length 0.47 mm, width 0.30 mm. Mesoventrum: keel slightly widened between mesocoxae Fig. 54 View FIGURES 47 – 60 . Mesepiventra: clearly reticulate, evenly rounded to mesocoxae, Fig. 54 View FIGURES 47 – 60 . Metaventrum: metepiventral sutures short reaching only 1/3 of the length of the sclerite, Fig. 62 View FIGURES 61 – 71 .

Male: posterior intercoxal process of metaventrum with fringe of long, flattened setae, Fig. 93. Aedeagus Fig. 86a/b.

Female: spermatheca Fig. 79 View FIGURES 72 – 81 .

Etymology. Named after Dr Margaret Thayer, the collector.

Diagnosis. The reticulation of the mesoventrum, very short metepiventral sutures and square mentum distinguish this species.

Type data: Holotype: ♂, Chile, Osorno Pr., Los Lagos, Parque Nac. Puyehue, Antillanca road, Valdivian rainfor., forest leaf and log litter, 470m, 20–25.xii.1982, A. Newton & M. Thayer ( FMNH) . Paratypes: 350 examples, same data as holotype ( FMNH, BMNH) ; 19 examples, Chile, Osorno Pr., hills S of Muicolpué, secondary Valdivian forest , 160m, 21.12.82, A. Newton & M. Thayer ( BMNH) ; 101 examples, Chile, Osorno Pr., Parque Nac. Puyehue, 4.1 km E Anticura, trap site 662, Valdivian rainfor., forest leaf and log litter, Berlese , 430m, 19–26.xii.1982, A. Newton & M. Thayer ( FMNH, BMNH) ; 4 examples, Chile, Osorno Pr., Parque Nac Puyehue, Antillanca Road, trap site 661, Valdivian rainfor., forest leaf and log litter, Berlese , 690m, 18–24.xii.1982, A. Newton & M. Thayer ( BMNH) ; 2 examples, Chile, Valdivia Pr., 4.1km W Anticura, trap site 663, Valdivian rainfor., leaf litter on forest floor, 160m, A. Newton & M. Thayer ( FMNH) .