Nouns ending in -a (often Latin or scientific) add -e to form the plural.
Planula is regular. It follows the -ae Addition rule.
Use plural verbs: "The planulae are ready" (not "is ready").
Yes. The plural planulae is standard across all English variants.
The word planula follows the standard English pluralization rule. When forming the plural, planula becomes planulae. This follows the -ae Addition pattern, which is one of the most common plural rules in English.
Understanding why planula becomes planulae helps with spelling and pronunciation. Nouns ending in -a (often Latin or scientific) add -e to form the plural.
When using planulae in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The planulae are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.