Ptenothrix
Börner, C, 1906
globular springtails
Species Guides
12Ptenothrix is a of globular springtails in the Dicyrtomidae, containing approximately 92 described worldwide. The genus is distinguished by specific chaetotaxy features, including a large without , bothriotricha setae, and characteristic acanthoid on the and abdomen. Species occur across diverse biogeographic regions including the Amazon, Andes, Caribbean, and Arctic. The genus was established by Börner in 1906.
Pronunciation
How to pronounce Ptenothrix: //ptɛˈnɒθrɪks//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from other Dicyrtomidae by the combination of: large without , presence of bothriotricha, abdomen covered with small acanthoid , and absence of neosminthuroid chaetae. The modified serrated chaetae on the hind tibiotarsus (2–3 in number) and serrated chaetae on the dens are additional diagnostic features. Claws lacking tunica separate it from some related genera.
Images
Appearance
Globular body form typical of Symphypleona. Large lacking a , covered posteriorly with small acanthoid . and abdomen bear at least some large acanthoid chaetae. Hind tibiotarsus with 2–3 modified serrated chaetae. Claws usually lack a tunica. Dens with outer and inner chaetae often serrated. No neosminthuroid chaetae present.
Distribution
Widespread across multiple biogeographic regions: Amazon, Andean, Antillean and southern Florida, Arctic and Sub-arctic, and Caribbean mainland. Individual show more restricted distributions, with records from North America, South America, Europe, Asia (including China, Japan, Korea, India), Hawaii, and various Pacific islands.
Similar Taxa
- Other Dicyrtomidae generaPtenothrix differs from related in its specific chaetotaxy pattern, particularly the combination of bothriotricha on the , absence of neosminthuroid , and the structure of hind tibiotarsal and dens chaetae.
More Details
Taxonomic note
Wikipedia and iNaturalist provide conflicting counts for this (approximately 92 vs. 11 described species). The higher figure appears more current based on the extensive species list provided. The genus is defined primarily by chaetotaxy characteristics rather than gross .