Plurals in Latin! This is important.

Just to clear a few things up with plurals in Latin (since in paleontology, the language is dealt with often).

If it ends with -us, generally its plural ends with -i. Example: cactus -> cacti. Some other plurals for words, however, end with -era. Example: genus -> genera.

If it ends with -a, its plural ends with -ae. Examples: alumna -> alumnae, aurora -> aurorae.

If it ends in -um, its plural ends with -a. Examples: medium -> media, datum -> data. (Yes, data is plural.)

If it ends with -ix, its plural ends with -ices. Example: appendix -> appendices.

If it ends with -is, its plural ends with -es. Example: parenthesis -> parentheses.

Oddball words like species maintain their singular form in the plural.

I hope this brief guide helped you. The more you know. Because knowledge is power!