Geophilus

Compost Centipedes

is a large of soil in the Geophilidae, with approximately 140 . The genus has a Holarctic distribution and exhibits considerable morphological diversity, with body lengths ranging from under 1 cm to over 7 cm and leg pair counts varying from 29 to 89. Several species have adapted to specialized , including deep cave environments. The genus is characterized by distinctive structural features of the , forcipules, and trunk .

Geophilus by (c) Derek Hennen, some rights reserved (CC BY), uploaded by Derek Hennen. Used under a CC-BY license.

Geophilus by (c) Bastien Le Mort, some rights reserved (CC BY), uploaded by Bastien Le Mort. Used under a CC-BY license.

Geophilus by (c) Amelie Keane, some rights reserved (CC BY), uploaded by Amelie Keane. Used under a CC-BY license.

Pronunciation

How to pronounce Geophilus: /dʒiˈɒfɪləs/

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Identification

can be distinguished from other European Geophilidae by combinations of characters including the shape of the forcipular apparatus, arrangement and extent of sternal porefields, number and distribution of coxal pores, and the size and form of ultimate legs. G. pygmaeus is uniquely identified by its small size (under 2 cm), 41–47 leg pairs, and distinctive coxal pore arrangement. G. gigas exceeds 6 cm with swollen ultimate legs in both sexes, scattered coxal pores numbering in tens, and sternal pore-fields with additional pore groups. Cave-dwelling species such as G. hadesi and G. persephones exhibit elongated , trunk , and leg .

Images

Appearance

in this have slightly elongate with on labral intermediate parts. The forcipules are usually poorly elongate with a single small tubercle at the base of each tarsungulum. The ultimate is shaped. The has complete or nearly complete coxo- , and - are incomplete. trunk metasternites usually feature an anterior medial socket and a transversally elongate pore-field. Body length ranges from approximately 1 cm to 8 cm. Leg pair counts vary widely: most have moderate numbers, but some have notably few (29–35 pairs) while others have many (up to 89 pairs in G. caucasicus).

Habitat

Most are soildwelling ( or ). Some species inhabit caves, with at least two species—G. hadesi and G. persephones—having complete confined to cave environments. G. hadesi has been recorded at depths of 1,100 meters below ground, making it the deepest-dwelling known . G. serbicus is described as epigeic (surface-dwelling).

Distribution

Holarctic distribution. Specific documented ranges include: Southern Limestone Alps and northernmost Dinarides (G. pygmaeus); Iran (G. gigas); Stara Planina Mountains, Eastern Serbia, Balkan Peninsula (G. serbicus); and deep caves in the Velebit Mountains, Croatia (G. hadesi).

Diet

, feeding on other animals.

Ecological Role

in soil and cave . Cavedwelling are among the top predators in their subterranean .

Similar Taxa

EndogeophilusBoth are in the . Endogeophilus is a rare genus distinguished from Geophilus by structural features detailed in taxonomic .

More Details

Etymology

From Ancient Greek γεω- (geo-, "earth") and φίλος (phílos, "lover"), referring to the soildwelling habit. The generic name first appeared in Brewster's Edinburgh Encyclopaedia in 1814 as electricus.

Taxonomic status

The is largely considered synonymous with Brachygeophilus. It is the largest genus in the .

Notable size extremes

Among the smallest are G. minimus (9.5 mm), G. pinivagus (10 mm), G. richardi (10 mm), G. pusillus (11 mm), and G. piae (11 mm). Among the largest are G. procerus (72 mm) and G. piedus (75 mm).

Cave adaptation

G. hadesi and G. persephones are the only known geophilomorphs with entire confined to cave environments. Their names reference Hades and Persephone from Greek mythology.