Related Experiment Video
Updated: Apr 19, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
The first fossil spider (Araneae: Palpimanoidea) from the Lower Jurassic (Grimmen, Germany)
Paul A Selden1, Jason A Dunlop2
1Paleontological Institute and Department of Geology, University of Kansas, Lawrence, Kansas, USA Natural History Museum, London, UK;;
Abstract:
The first Lower Jurassic (Lias) spider is described as Seppo koponeni n. gen. & n. sp. from a single female specimen from Grimmen, Germany. It most likely belongs to the Palpimanoidea, on account of the presence of cheliceral peg teeth and other features consistent with palpimanoid families, though its familial placement is uncertain. Its presence in the region at that time concurs with ideas about the more widespread presence of palpimanoids across the world in the early Mesozoic, before the break-up of Pangaea.
Related Concept Videos
The Fossil Record
Carbon Skeletons
Tooth Anatomy
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
What is Evolutionary History?
Lampbrush Chromosomes
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
Bones of the Lower Limb: Tibia and Fibula

