Katianna
C. Börner, 1906
Species Guides
1Katianna is a of globular springtails (Collembola: Symphypleona) with worldwide distribution. Members are distinguished by their minute size (approximately 1 mm), hairy , and abundant setae covering the , particularly toward the . The genus has been recorded across diverse regions including Europe, the Andes, Central Australia, the Caribbean, and Antarctica. A putative undescribed species from the Pacific Northwest, informally designated "Katianna 10" or "Mtn Dew Katianna," was first documented in 2016 and rediscovered in 2024.
Pronunciation
How to pronounce Katianna: /ˌkætiˈænə/
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Identification
Distinguished from other Katiannidae and Symphypleona by the combination of: (1) dense abdominal setae concentrated posteriorly, (2) conspicuously hairy , and (3) extremely small body size (~1 mm). The hairy antennae and setal appear to be genus-level diagnostic characters. Separation from Bourletiella and other globular springtails requires examination of these setal patterns and antennal pilosity.
Appearance
Minute globular springtails, typically about 1 mm in length. Body covered with abundant setae, with dense hair-like structures especially concentrated on the . characteristically hairy. Overall body form consistent with Symphypleona: compact, rounded profile with antennae held in a characteristic position.
Habitat
Has been collected from rotten leaf litter in orchard settings and cold, damp litter environments. The putative Pacific Northwest occurs in montane or forested conditions. Specific microhabitat requirements vary by and region.
Distribution
Worldwide distribution with confirmed records from: Europe, Andean South America, Central Australia, Caribbean mainland, and Antarctic & Subantarctic regions. Historical record from Poespo, Java, Indonesia (though K. coeruleocephala from this locality has been synonymized with Bourletiella viridescens). The Pacific Northwest of North America represents a recently documented gap in distribution, filled by an undescribed species first recorded in 2016.
Similar Taxa
- BourletiellaFormerly confused with Katianna; K. coeruleocephala was synonymized with Bourletiella viridescens. Bourletiella lacks the dense abdominal setae and hairy characteristic of Katianna. Globular body form similar but antennal and setal characters differ.
- Other Katiannidae within Katiannidae share globular body form but differ in setal patterns; Katianna is distinguished by the specific combination of hairy plus dense abdominal setae toward the .
More Details
Taxonomic note on Java record
The only historical -level record for Java, Katianna coeruleocephala Handschin 1920, collected in December 1896, has been synonymized with Bourletiella viridescens. The specimen has never been recollected despite the being present in the region.
Undescribed Pacific Northwest species
An undescribed species, informally designated "Katianna 10" or "Mtn Dew Katianna," has been documented from the Pacific Northwest since 2016, with a confirmed rediscovery in 2024. This fills a notable geographic gap in the 's worldwide distribution.
Nomenclatural note
The was established by Börner in 1906. The epithet coeruleocephala was originally spelled coerulescephala in figure labels by Handschin (1920), but the first spelling in the text (coeruleocephala) has priority.