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LICHIDA FACT SHEET |
 | | Some treatments recognize an Order Odontopleurida separate from Order Lichida, although protaspid similarities suggest the two are ultimately related; both lichid and odontopleurid protaspides possess distinctive paired spine or tubercle patterns on cephalon and protopygidium, have an anterior border, distinct axis, and marginal spines on protopygidium (Thomas and Holloway 1988). |
 | | Whittington (2002) adds that the Odontopleuridae and Lichidae differ in several other respects, including ornamentation (primarily granules and tubercles in lichids, spines in odontopleurids), extent of ventral calcification (extended doublure with terrace ridges in lichids, not developed in odontopleurids), and hypostome size (larger in lichids). |
 | | Systematics of the Trilobite families Lichidae Hawle and Corda, 1847 and Lichakephalidae Tripp, 1957: The application of Bayesian inference to morphological data. |
| www.trilobites.info /ordlichida.htm (1004 words) |
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