oa Annals of the Natal Museum - New South African species of the genus Scutelliseta Richards (Diptera: Sphaeroceridae)

Volume 20, Issue 1
  • ISSN : 0304-0798



A new diagnosis of the genus Scutelliseta Richards, 1960, is given, based on further material of the type species and sixteen new species which are descriptionbed and keyed; these seventeen species are divided on mor­phological criteria into four groups: Group 1 - mesaptiloides n. sp., caledoniana n. sp., orbitalis n. sp.; Group 2 - luteifrons n. sp., albicoxa n. sp., xanthothorax n. sp., coriacea Richards; Group 3 - lepidogaster n. sp., peregrina n. sp., leonina n. sp., bicolorina n. sp., brunneonigra n. sp., swaziana n. sp.; Group 4 - microptera n. sp., megalogaster n. sp., nigrocoerulea n. sp., procoxalis n. sp. Species of Group 1 are confined to the winter-rainfall area in the South-West Cape, those in Group 2 are from the Southern Cape coastal strip, those in Groups 3 and 4 are from montane forests in Natal, Swaziland and the Eastern Transvaal escarpment. All the species are flightless and humicolous. It is considered that these species originated from perhaps four closely allied ancestral species dimorphic in respect of wing development, and that loss of wings, halteres and other modifications evolved polyphyletically.

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