More than 100 seeds of vascular plants were recovered from the same sample that yielded the beetle fossils. The seeds are exceptionally well- preserved with interiors filled with authigenic crystals. The seeds are tentatively identified as Empetrum, cf. Ranunculus, cf. Carex, and a species of Rosaceae. None of these taxa presently occurs in Antarctica. Empetrum is a common plant of better-drained locations in the Magellanic Moorland vegetation of the wet Pacific Coast of South America, but also occurs in the heath vegetation of drier sites on the basaltic mesetas of Patagonia.
Based on the domination of Nothofagus pollen in the Sirius Group, it has been suggested that the vegetation was more depauperate than any presently existing in the regions surrounding Antarctica. The beetle and seed fossils suggest a biota with a higher diversity. In combination with Nothofagus, previously described from wood and leaves, and Dacrydium, described from its pollen occurrence, the biota would have had similarities with the Magellanic Moorland of the wet, Pacific coast of South America.
The existing non-parasitic insect fauna of Antarctica consists only of springtails (Collembola) and midges (Chironomidae). The listroderine weevil is the first tangible evidence that Antarctica had a richer insect fauna. Entomologists have long argued this based on the amphi-Antarctic distribution of many insect species but have never had the proof. Given that the specimen was about 8 mm in length and flightless, it is most improbable that it was transported to Antarctica by wind or water currents. Most probably, it represents a member of a lineage whose ancestors inhabited Antarctica from the time of Gondwanaland.
More insect and plant macroscopic remains can be expected to be found in the Sirius Group as different sedimentary facies are discovered and as larger examples are examined. Potentially, these fossils are important for answering questions relating to (1) the depositional environment of the formation, and (2) evolutionary rates and the dispersion of the fauna.