Pachymerium is a genus of centipedes in the family Geophilidae. Centipedes in this genus range from 2 cm to 8 cm in length and have 37 to 79 pairs of legs. The Chilean species Pachymerium armatum measures only 20 mm in length and has only 37 leg pairs, the minimum number observed in this genus. The Russian species P. minutum is also notable for its small size and its modest number of legs. This genus contains the following species:
The Geophilidae are a polyphyletic, cosmopolitan family of soil centipedes in the superfamily Geophiloidea containing the mostly defunct clades Aphilodontidae, Dignathodontidae, Linotaeniidae, Chilenophilinae, and Macronicophilidae.
Himantariidae is a monophyletic family of centipedes in the order Geophilomorpha and superfamily Himantarioidea, found almost exclusively in the Northern Hemisphere. The number of leg-bearing segments in this family varies within as well as among species and ranges from 47 to 181. These centipedes are very elongated with a high mean number of trunk segments and great variability in this number within species. The maximum number of legs recorded in this family appears in the species Chomatobius bakeri. The minimum number of legs recorded in this family appears in the species Garriscaphus oreines, This family contains these genera:
Mecistocephalus heteropus is a species of centipedes in the family Mecistocephalidae. It is endemic to Sri Lanka. This species has 49 pairs of legs.
Mecistocephalus subinsularis is a species of centipedes in the family Mecistocephalidae. It is endemic to Sri Lanka. This species has 49 pairs of legs.
Mecistocephalidae is a monophyletic family of centipedes in the order Geophilomorpha. It is the only family in the suborder Placodesmata. Most species in this family live in tropical or subtropical regions, but some occur in temperate regions. This family is the third most diverse in the order Geophiliomorpha, with about 170 species, including about 130 species in the genus Mecistocephalus.
Scutigerina weberi is a species of centipedes in the family Scutigerinidae.
Geophilus is a large, heterogeneous genus of soil centipedes in the family Geophilidae largely considered to be synonymous with Brachygeophilus. It is a mostly holarctic genus characterized by a claw-shaped ultimate pretarsus, anterior porefields, complete or nearly complete coxo-pleural sutures at the prosternum, and incomplete chitin-lines. Centipedes in this genus range from 1 cm to 8 cm in length. The generic name first appeared in Brewster's Edinburgh Encyclopaedia in 1814 as Geophilus electricus.
Schendylidae is a family of centipedes in the order Geophilomorpha.
Tygarrup is a genus of centipedes in the family Mecistocephalidae, found mainly in southeast Asia and from the Seychelles to Hawaii. Although species in this genus can have either 43 or 45 leg-bearing segments, most of these species have 45 leg pairs. An undescribed Tygarrup species found in the Andaman Islands has 43 leg pairs. Centipedes in this genus range from 2 cm to 6 cm in length. Tygarrup javanicus is one of the smallest of the mecistocephalid species and has become an invasive in greenhouses in Europe.
Arrup is a genus of centipedes in the family Mecistocephalidae, native to Europe and Asia as far as Japan. These centipedes range from 1 cm to 5 cm in length. All species in this genus have 41 leg-bearing segments. Most are soil-dwellers but Arrup akiyoshiensis is a troglobiont.
Aphilodontidae is a monophyletic clade of soil centipedes in the family Geophilidae found in South America and South Africa. These centipedes are closely related to Geoperingueyia and characterized by shieldlike setae on the front of the head, lateral parts of the flattened cuticle above the mouthparts, and combined forcipular trochanteroprefemur and femur. The number of legs in this clade varies within species as well as among species and ranges from as few as 33 pairs of legs to as many as 93 pairs. The three species in the Brazilian genus Mecophilus have the fewest legs and smallest size in this clade. The two species with the fewest legs in the Neotropical genus Aphilodon also feature notably modest numbers with limited variation observed: A. meganae and A. indespectus. Aphilodon meganae is also notable for its small size, the smallest in its genus. Species with more legs also exhibit greater variation in the number of leg pairs.
Geophilus duponti is a species of centipede in the Geophilidae family. It is endemic to Australia, and was first described in 1897 by Italian entomologist Filippo Silvestri.
Tuoba is a genus of 17 species of centipedes, in the family Geophilidae. It was described by American biologist Ralph Vary Chamberlin in 1920.
Mecistocephalus is a genus of centipedes in the family Mecistocephalidae. It was described by British entomologist George Newport in 1843.
Mecistocephalus tahitiensis is a species of centipede in the Mecistocephalidae family. It was described in 1862 by American myriapodologist Horatio Wood.
Pectiniunguis is a genus of centipedes in the family Schendylidae. It was described by American naturalist Charles Harvey Bollman in 1889. Centipedes in this genus range from 16 mm to 67 mm in length, have 35 to 73 pairs of legs, and are found in the tropical and subtropical regions of the Americas, Fiji, and west Africa. The African species Pectiniunguis minutus is notable not only for being the smallest in this genus but also for having as few as 35 leg pairs, the minimum number in this genus. The Brazilian species P. ducalis is notable not only for being the largest in this genus but also for having as many as 73 leg pairs, the maximum number in this genus.
Mecistocephalus uncifer is a species of centipede in the Mecistocephalidae family. It was described in 1919 by Italian myriapodologist Filippo Silvestri. This species has 49 pairs of legs and can reach 65 mm in length.
Mecistocephalus subgigas is a species of centipede in the Mecistocephalidae family. It was described in 1919 by Italian myriapodologist Filippo Silvestri. This species has 49 pairs of legs and can reach 60 mm in length.
Mecistocephalus glabridorsalis is a species of centipede in the Mecistocephalidae family. It was described in 1900 by Austrian myriapodologist Carl Attems. This species has 49 pairs of legs, can reach 85 mm in length, and is yellow with anterior segments and a head that are reddish brown.
