Douglassarachne

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Douglassarachne
Temporal range: Moscovian
Holotype specimen
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Clade:
Pantetrapulmonata
Genus: Douglassarachne
Selden and Dunlop, 2024
Species:
D. acanthopoda
Binomial name
Douglassarachne acanthopoda
Selden and Dunlop, 2024

Douglassarachne is an extinct

Mazon Creek Lagerstätte, Illinois
, US.

This arachnid is characterized by having large spines on its legs. It is unknown which group this arachnid specifically belongs to.

Etymology

The genus is named for the Douglass family who donated the specimen to the Field Museum for study.[1]

History

Douglassarachne is known from Mazon Creek which preserves fossils around 308 million years ago. The fossil was preserved in a

Kankakee County, Illinois. Around 1990 he would sell the fossil to David Douglass.[1]

At this time it, was displayed in the Douglass family's Prehistoric Life Museum. In 2023, when it became apparent that this specimen represented a new species, David Douglass donated the specimen to the Field Museum of Natural History so it could be researched.[1]

The specimen is deposited in the collections of the Field Museum of Natural History with the number PE 91366.[3]

Morphology

Reconstruction

The arachnid is characterized by four pairs of legs and a body approximately 15 mm (0.59 in) long. The body is divided into an anterior

tergites without ornamentation. The posterior segments form a small anal tubercle, though the total number of segments is unclear.[1]

Classification

The morphology of Douglassarachne does not align with any known arachnid orders. With similarly spiny legs, it superficially resembles certain

apomorphic characters.[1]

Paleoecology

Its spiny legs like some of modern harvestmen suggests that it uses spines for protection from predators. There are multiple taxa from Late Carboniferous with similarly developed spines (such as

trigonotarbid Eophrynus or millipede Euphoberia and Myriacantherpestes), which possibly reflects the evolution of their predators.[1]

References

  1. ^ .
  2. ^ "308-Million-Year-Old Fossil Arachnid Is An 8-Legged Evolutionary Puzzle". IFLScience. 17 May 2024. Retrieved 2024-05-20.
  3. ^ "Phalangiotarbus | Geology Collections". collections-geology.fieldmuseum.org. Retrieved 2024-05-21.