Yes, the noun 'anatis' is in the singular form. It's a feminine gender noun. 'Of the duck' is its English equivalent.
Anas or anatis.
you are (singular)
"Hunters" in Latin are venatores (singular venator).
Tu (singular). Vos (plural).
Tu. (singular) Vos. (plural)
Habes. (singular) Habetis. (plural)
The name pediculosis comes from the Latin word for louse (singular) or lice (plural).
Tu (singular) Vos (plural)
Natavisti (singular "you"); natavistis (plural "you").
Vale! (to singular) Valete! (to plural)
Comitia, maybe? That's plural of comitium. 'Commitia' isn't a Latin word.
A "Pilus" is the Latin for a hair, so following the Latin rules for plurals, the plural is "pili".