Geophilus flavus

G. flavus occurs in a range of habitats across central Europe, North America, Australia, New Zealand and other tropical regions.

[14] The species is widely distributed across regions of Europe, North America and Australia, in suitable local environments such as grassy woodlands and forests.

[7] First, a courting ritual takes place, involving a series of defensive postures and tapping of the legs and antennae on the extremities of the partner.

[4] Unlike other subgroups of centipede, such as Lithobiomorphs, Geophilomorphs actively seek out their prey by searching through leaf litter and mineral soil.

[4] Generalised trophic cascades, indirect food web maps, indicate that predatory invertebrates such as G.flavus have a significant impact on energy and nutrient transfer.

[18] In periods of increased temperature and soil dryness as a result of season or from ongoing climate change, G. flavus displays higher rates of food consumption.

[18] These decomposition processes increase the production of bacteria and fungi, key dietary components of the secondary consumers that G. flavus preys upon.

[19] Conversely, during colder months when prey is less abundant and G. flavus is less active, feeding interactions increase across the entire soil community.

[19] Gut content analysis of the centipede reveals high levels of lumbricid and enchytraeid proteins, nutrient markers of small soil earthworms.

[5] They play a key role in maintaining ecological stability in small-scale soil communities by managing smaller prey populations.

[3] G. flavus inhabits a diverse range of organic structures including soil, rocks, trees, bark and decomposing leaf litter.

[20] The texture and thickness of the leaf litter above the soil surface provides structural niches which facilitate microhabitats and a diversity of small invertebrates that G.flavus hunts.

[21] The nature and structure of the habitat is a large determinant of predator-prey relationships, as denser organic layers increase the search time required for centipedes to locate prey.

[10] G. flavus moves through the soil similarly to earthworms, expanding their length forward, and then contracting in order to pull their body towards their head.

[5] The highly adjustable fat body allows G.flavus to maximise prey abundance when environments are warmer, retaining nutrients for later conversion, usually during hibernation periods.

[5] To prove this, researchers collected centipedes from their habitats and placed them into artificial environments which simulated temperature and humidity conditions of a particular season.

Researchers showed that the fat body in centipedes was constituted by irregular lobular masses of adipocytes, containing organelles responsible for nutrient synthesis.

[23] The study somewhat refutes this claim, hypothesising that G.flavus may have been introduced through the East of Urals several decades ago based on recent distribution and botanical reports.

[23] The study also notes that G.flavus may have been falsely categorised as G.proximous in previous USSR reports, making it unclear whether or not the species is new to Western Siberia.

[15] These descriptions largely aligned with previous documentation by De Geer in 1778, stipulating antennae more than 3 times as long as the head and usually less than 60 leg bearing segments.

[24] This connection was likely made as centipedes often reside in dark, wet places like caves, which are considered to be liminal entrances to the underground realm by Mayan culture.

Body of Geophilus flavus
Rainy canal in Chesire, England. Likely habitat for G.flavus.
Soil habitat structure of Geophilus flavus
Mayan glyphs