Leptictidium auderiense

Overview

Leptictidium auderiense is a mammal known from Eocene Messel. Leptictidium species from the same locality resemble one another but differ in size, teeth, and snout shape. Small differences in the head help distinguish species.^[1]

Key facts

Three Leptictidium species are known from Messel. An institutional account explains that auderiense has a shorter snout than nasutum. Even similar-looking ancient mammals reveal different features when their heads and teeth are compared closely.^[1]

Time and place

This mammal is known from Eocene Messel in present-day Germany. The Eocene spanned approximately 56–34 million years ago. Comparing several species from the same locality reveals differences in bodies within the group.^[1][2]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

The genus is presented as having short forelimbs, relatively long hind limbs, and an elongated tail. This comparison is also used when considering the whole body of auderiense. At species level, attention can focus on its shorter snout and dental differences.^[1]

Leptictidium auderiense specimen SMF-ME-11377 was estimated at approximately 466 g using calculations based on cranial and postcranial measurements. A different method applied to the same specimen gives approximately 627 g. Researchers used both values to examine how agile this small mammal may have been.^[7]

Habitat and reproduction

The contrast between short forelimbs and long hind limbs invites questions about support and movement on the ground. Its long tail and hip region also warrant comparison. Comparing bodies within the genus helps investigate different lifestyles of small mammals.^[1]

Fossil discovery

SMF-ME-11377 from Middle Eocene strata at Messel Pit in present-day Germany was used in inner-ear research. In 2016, researchers digitally reconstructed its internal structures using high-resolution CT. Small structures inside the head, as well as overall body form, thus informed research on lifestyle.^[3]

References

1. Welterbe Grube Messel — Three species of Leptictidium from Messel
2. International Commission on Stratigraphy (2024) — Geological time chart
3. Ruf et al. (2016) — Study of the inner ear and agility of Leptictidium
4. Mayr2005 — The skeleton of Messelastur and bird relationships
5. Welterbe Grube Messel — Three species of Leptictidium from Messel
6. Mayr2021 — New skeletal comparisons of Messelasturidae
7. Ruf et al. (2016) — Study of the inner ear and movement of Leptictidium

Research questions

Can agility be estimated from the inner ear? In 2016, researchers used semicircular-canal size to propose that Leptictidium may have been highly agile. However, predictions based on angles gave a different picture, and they explained that differences among individuals also required further study. This reveals science reading the same body region through different indicators.^[3]

Observation

Move your gaze from the snout to the short forelimbs and long hind limbs. Considering small cranial differences alongside the broad arrangement of the whole body helps compare this mammal with other Messel species.^[1]