page_title: Siphonophorida
section_title: Classification
hierarchical_section_title: Siphonophorida / Classification
caption_attribution_description: English: Columbianum major (Siphonophorida, Siphonophoridae), female, from Reserva Duche Terra Firme, Amazonas Province, Brazil. Total length 43 mm. , Reserva Flor.
context_page_description: Siphonophorida is an order of millipedes containing two families and over 100 species. This order includes the millipede with the most legs, Illacme plenipes.
context_section_description: Two families are traditionally recognized. Differences between the two families include antennae and head structure: the large family Siphonophoridae, with over 100 species, has elongate beak-like mouthparts, and straight antennae with sensory pits on the fifth and sixth antennal segments ("antennomeres)". The family Siphonorhinidae, with only around 10 species, lacks the beak-like mouthparts, and has elbowed antennae lacking sensory pits on the fifth and sixth antennomere.  The siphonorhinid genus Nematozonium with two species, is sometimes placed in its own monotypic family, Nematozoniidae.
  Family Siphonophoridae Newport, 1844
  Balizonium
  Columbianum
  Gonatotrichus
  Linozonium
  Lomboknium
  Okeanozonium
  Pterozonium
  Rhinosiphora
  Siphonacme
  Siphonophora
  Family Siphonorhinidae Cook, 1895
  Illacme
  Kleruchus
  Nematozonium
  Siphonorhinus
caption: Columbianum major, Brazil
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