Neanurinae

Börner, 1901

Neanurinae is the largest of () in the , containing approximately 800 described . These springtails are distinguished by their stout, pudgy bodies, short legs, and complete loss of the —the springing organ that characterizes most Collembola. They move exceptionally slowly and possess a distinctive mulberry-like appearance due to spherical covering the body surface. The subfamily was established by Carl Börner in 1901 and is currently divided into six tribes, though phylogenetic analyses suggest this may not reflect evolutionary relationships.

Neanurinae by (c) Ludivine Lamare, some rights reserved (CC BY), uploaded by Ludivine Lamare. Used under a CC-BY license.

Sensillanura barberi by (c) Even Dankowicz, some rights reserved (CC BY), uploaded by Even Dankowicz. Used under a CC-BY license.

Neanura muscorum by (c) Alexis Tinker-Tsavalas, some rights reserved (CC BY), uploaded by Alexis Tinker-Tsavalas. Used under a CC-BY license.

Pronunciation

How to pronounce Neanurinae: /niˈæn.jʊˌraɪ.niː/

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Identification

Neanurinae can be distinguished from other by the complete loss of the , making them unable to jump. Their slow movement contrasts sharply with the rapid springing of most . The combination of stout body, spherical , and broad toothed is diagnostic within the . Within the , tribal assignment relies heavily on tubercle arrangement and patterns, though these characters have been shown to lack strong phylogenetic support.

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Habitat

Predominantly forest , with tropical and temperate woodlands being particularly -rich. Occupies very moist terrestrial . Some species are . High altitude mountain have been documented in Southeast Brazil and the Caucasus.

Distribution

All continents including Antarctica. Particularly diverse in tropical and temperate woodlands. The austral Ectonura has been recorded from the Neotropics. Documented from Belize, Colombia, Rica, Mexico, Panama, Southeast Brazil, and the Caucasus region.

Diet

Narrow trophic specialization with slime moulds as preferred food source. This dietary preference has been experimentally confirmed.

Behavior

Exceptionally slow movements compared to the vast majority of . Defense relies on mechanical barriers provided by and stiff , supplemented by production of volatile poisonous chemical substances such as phenols. Unable to jump due to complete loss of structure.

Similar Taxa

Other Neanuridae subfamiliesNeanurinae differs from other in the by its complete loss and distinctive mulberry-like tuberculate appearance. Other retain some furcula development and lack the pronounced spherical .
Other CollembolaAll other possess functional for jumping and exhibit much faster movement. Neanurinae's slow, crawling and inability to spring immediately distinguishes them in the field.

More Details

Tribal Classification

Currently divided into six tribes: Morulodini, Neanurini, Lobellini, Paranurini, Paleonurini, and Sensillanurini. This proposed by Cassagnau in 1989 has been tested using cladistic methods; only Lobellini was supported as . Phylogenetic analysis of 101 morphological characters indicates that taxonomic characters are shared among members of different tribes, suggesting the current classification has limited phylogenetic basis.

Taxonomic History

Established by Carl Börner in 1901. Originally proposed as a , this rank was retained when were discovered to be closely related to but not actually , necessitating changes to Börner's original -level .

Diversity

Constitutes nearly one-tenth of all known , making it exceptionally diverse within the .