Lichida
| Lichida Temporal range: Tremadocian–Frasnian | |
|---|---|
 | |
| Terataspis grandis | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Trilobita |
| Order: | Lichida Moore, 1959 |
| Superfamilies [1] | |
| |
Lichida is an order of typically spiny trilobite that lived from the Tremadocian to the Devonian period.[2] These trilobites usually have 8–13 thoracic segments.[1] Their exoskeletons often have a grainy texture or have tubercles. Some species are extraordinarily spiny, having spiny thoracic segments that are as long or longer than the entire body, from cephalon (head) to pygidium (tail). The sections of the pygidia are leaf-like in shape and also typically end in spines.
References
- ↑ 1.0 1.1 S. M. Gon III (January 1, 2008). "Pictorial guide to the order Lichida". Retrieved October 24, 2013.
- ↑ H. B. Whittington (2002). "Lichidae (Trilobita): morphology and classification". Journal of Paleontology 76 (2): 306–320. doi:10.1666/0022-3360(2002)076<0306:LTMAC>2.0.CO;2. JSTOR 1307144.
Further reading
- Margaret J. Campbell & Brian D. E. Chatterton (2009). "Silurian lichid trilobites from northwestern Canada: ontogeny and phylogeny of lichids". Journal of Paleontology 83 (2): 263–279. doi:10.1666/07-140R1.1.
External links
Data related to Lichida at Wikispecies