Bialba
genus and species of fly
Bialba rotunda is a species of fly belonging to the family Drosophilidae. The species, which is the sole member of the genus Bialba, was originally described from a specimen obtained in Queensland, Australia.
Etymology
The generic name comes from the Latin words for "two" and "white." The specific name, rotunda, is Latin for "round."
Taxonomy
The holotype of B. rotunda was collected near Mt. Tozer in the Iron Range on a collecting expedition conducted by the CSIRO Division of Entomology in the summer of 1986 and was described, along with its genus, by Ian R. Bock in 1989.
Description
Bialba sport feathery arista with lateral white bands and orbital bristles on the posterior half of the front, as well as a single vibrissa. The mesonotum is shiny and dark with six rows of acrostichal bristles along the top and two pairs of dorsocentral bristles alongside them. The scutellum is bulbous and a similar color to the mesonotum, with two pairs of macrochaetae but no setae. The wings of Bialba have a weak anal vein, and the discal and second basal cells of the wing are confluent.
B. rotunda is 2.1 mm long with each wing measuring 1.8 mm. Its distinguishing feature is its white frontal bands flowing on to the antennae.
“Bialba” enters the record as genus and species of fly. Crown Archives preserves that source wording while asking what Bialba, genus and species can confirm, complicate or overturn.
Why this record matters
“Bialba” is worth following because a concise public description often conceals a longer documentary argument. Here, Bialba, genus and species provides the most credible route into that argument.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Mar 25, 2026. The linked authority identifier is Q18110066. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1986 and 1989.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
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This entry incorporates text from “Bialba” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.