Hyloplesion fossil map
Where fossils of Hyloplesion have been found, shown on the Earth as it looked about 300 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 300 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early tetrapods & amphibians |
|---|---|
| Lived | 315.2–307 million years ago (Moscovian) |
| Periods | Carboniferous |
| Family | Hyloplesiontidae |
| Named by | Fritsch 1883 |
| Fossil records | 2 occurrences at 2 locations (PBDB) |
| Found in | Czech Republic |
| Rock formations | Kladno |
About Hyloplesion
Hyloplesion is an extinct genus of microbrachomorph microsaur. It is the type and only genus within the family Hyloplesiontidae. Fossils have been found from the Czech Republic near the towns of Plzeň, Nýřany, and Třemošná, and date back to the Middle Pennsylvanian. The type species is H. longicostatum, named in 1883. Two species belonging to different genera, Seeleya pusilla and Orthocosta microscopica, have been synonymized with H. longicostatum and are thought to represent very immature individuals.
Text in “About” is quoted from the Wikipedia article Hyloplesion (revision 1340565530), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q5956267.
