Singular and plural endings of some scientific terms:
-um, -on -a
-en -ina Foramen Foramina
-a -ae or -ata Larva/Stoma Larvae/Stomata
-ur -ora Femur Femora
-us -i (or -ora, -ura) Nucleus/Corpus/Crus Nuclei/Corpora/Crura
-is -es Taxis/Symphysis Taxes/Symphyses
-ex, -ix -ices Matrix Matrices
-yx -yces Calyx Calyces
-anx -anges Phalanx Phalanges
-inx -inges Meninx Meninges
Notice that the "-a" ending is both a singular and a plural ending, and, as
such, is notoriously
confusing. You must simply learn which ending goes with which words.
For instance, note that it is one mitochondrion and many mitochondria.
On the other hand, it is one larva or pupa and many larvae or pupae.
Be aware as well that you would never write mitochondriae -- that would be a
plural of a plural,
and there is no such thing!
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