Trichadenotecnum castum
Betz, 1983
common barklouse
Trichadenotecnum castum is a uniparental in the , described by Betz in 1983. It is one of three obligately parthenogenetic species derived from the biparental ancestor T. alexanderae. are composed exclusively of females that reproduce via obligate . The species belongs to the T. alexanderae , a group of closely related barklice distinguished primarily by reproductive mode and subtle morphological differences.
Pronunciation
How to pronounce Trichadenotecnum castum: /ˌtraɪ.kəˌdɛ.nəˈtɛk.nəm ˈka.stəm/
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Identification
Females of T. castum can be separated from T. alexanderae and other uniparental in the complex (T. merum, T. innuptum) using morphological characters detailed in the . As a uniparental species, lacking males may indicate T. castum rather than the biparental T. alexanderae. Precise identification requires examination of specimens against the diagnostic key for females of the T. alexanderae species complex.
Distribution
Found in Europe, Northern Asia (excluding China), and North America. GBIF records indicate presence in the USA and the Azores (Graciosa, Pico, São Miguel, Terceira islands).
Behavior
Attracted to blacklight, as observed for related in the .
Human Relevance
Easily mistaken for or tiny by observers, but distinguished by rather than a or .
Similar Taxa
- Trichadenotecnum alexanderaeBiparental ancestor from which T. castum was derived; distinguished by presence of males and facultative rather than obligate
- Trichadenotecnum merumAnother uniparental in the same complex, distinguished by morphological characters in the female identification
- Trichadenotecnum innuptumThird uniparental in the complex, distinguished by morphological characters in the female identification
- Graphopsocus cruciatusAnother that co-occurs at blacklight; distinguished by belonging to a different () and different body form
- Indiopsocus spp.Other common that may be found in similar and at lights; distinguished by -level morphological characters
More Details
Reproductive Biology
T. castum represents an example of , where females produce female offspring without . This reproductive mode is obligate (not facultative) in this , meaning does not occur. The species originated from the biparental T. alexanderae, illustrating evolutionary transition to uniparental in .
Systematic History
Previously confused with T. alexanderae, T. castum was formally described as a new in 1983 based on integrated evidence from mating tests, observations, and morphological analysis across the 's range. The description was necessary because uniparental were previously lumped with the biparental species.