Illacme plenipes

Illacme plenipes is a siphonorhinid millipede found in the central region of the U.S. state of California. It has up to 750 legs. One of two known species in the genus Illacme, it was first seen in 1926, but was not rediscovered until 2005, almost 80 years after its discovery, by Paul Marek, then a Ph.D. student at East Carolina University and now at Virginia Tech.[1]

Illacme plenipes
A female I. plenipes with 618 legs
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Diplopoda
Order: Siphonophorida
Family: Siphonorhinidae
Genus: Illacme
Species:
I. plenipes
Binomial name
Illacme plenipes
Cook & Loomis, 1928
Predicted habitat suitability (maximum in blue) for I. plenipes based on climatic variables

Description

On average, I. plenipes have over 600 legs, twice the average for millipede species, with one recorded specimen having 750 legs.[2] It was the leggiest species known until the 2021 description of Eumillipes persephone, which can have over 1,000 legs.[3] It is relatively small-bodied among millipedes. Females grow to just over 3 cm; males are slightly smaller and have fewer legs.[2]

Taxonomic history

The species was first discovered in San Benito County, part of the California Floristic Province, in 1926 by federal scientist Orator Cook and formally described by Cook and Harold F. Loomis in 1928.[4] Cook and Loomis described the species without illustrations, and in 1996 Rowland Shelley of the North Carolina Museum of Natural Sciences re-examined specimens and redescribed the species.[5] Marek and colleagues produced a more detailed description of the morphology of I. plenipes in 2012 and provided refined illustrations based on scanning electron micrography.[2]

Classification

Illacme is a member of the order Siphonophorida and family Siphonorhinidae. A second species of the genus, Illacme tobini, was described in 2016.[6] The closest relative of Illacme is undetermined, but a likely candidate is Nematozonium of South Africa which shares a long, narrow body shape and characteristics including gonopods.[2]

References
  1. "ECU students rediscovers rare millipede". East Carolina University. June 15, 2006. Retrieved August 27, 2010.
  2. Marek, P.; Shear, W.; Bond, J. (2012). "A redescription of the leggiest animal, the millipede Illacme plenipes, with notes on its natural history and biogeography (Diplopoda, Siphonophorida, Siphonorhinidae)". ZooKeys. 241 (241): 77–112. doi:10.3897/zookeys.241.3831. PMC 3559107. PMID 23372415.
  3. Marek, Paul E.; Buzatto, Bruno A.; Shear, William A.; Means, Jackson C.; Black, Dennis G.; Harvey, Mark S.; Rodriguez, Juanita (2021). "The first true millipede—1306 legs long". Scientific Reports. 11 (1): 23126. doi:10.1038/s41598-021-02447-0. ISSN 2045-2322.
  4. O. F. Cook & H. F. Loomis (1928). "Millipedes of the order Colobognatha, with descriptions of six new genera and type species, from Arizona and California". Proceedings of the United States National Museum. 72 (18): 1–26, f. 1–6, pls. 1–2. doi:10.5479/si.00963801.72-2714.1.
  5. Shelley, Rowland M. (1996). "The milliped order Siphonophorida in the United States and northern Mexico" (PDF). Myriapodologica. 4 (4): 21–33.
  6. Marek, Paul E.; Krejca, Jean K.; Shear, William A. (2016). "A new species of Illacme Cook & Loomis, 1928 from Sequoia National Park, California, with a world catalog of the Siphonorhinidae (Diplopoda, Siphonophorida)". ZooKeys. 626: 1–43. doi:10.3897/zookeys.626.9681.

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