Abstract
Morphometric analyses carried out on 126 specimens of the early Cambrian (Cambrian Series 2, Stage 3) stem-group arthropod Isoxys volucris from North Greenland reveal a bimodal distribution, where Morphogroup A is characterised by a significantly wider doublure than Morphogroup B. The dimorphism is interpreted as intraspecific variation related to gender (sexual dimorphism), where the relative numbers of individuals within the two morphogroups are equal (ratio 1:1). The discovery of established sexual dimorphism in Isoxys may have implications for the taxonomic discrimination of other stemgroup arthropods within the morphologically diverse and disparate animals of the early Cambrian.
| Original language | English |
|---|---|
| Journal | Bulletin of the Geological Society of Denmark |
| Volume | 65 |
| Pages (from-to) | 47-58 |
| Number of pages | 12 |
| ISSN | 0011-6297 |
| Publication status | Published - 2017 |
Keywords
- Early Cambrian
- Isoxys
- Sexual dimorphism
- Sirius Passet Lagerstätte
- Stem-group arthropods