[Taxacom] ductus bursa or ductus bursae?

[Soowon Cho]

Dear members,

I use terms like 'ductus bursae' or 'corpus bursae' to describe the female
genitalia in Lepidoptera taxonomy. However, I am confused as the term
ductus bursae is a plural noun while only one ductus bursa is in the female
genitalia.
I searched the internet and found examples such as 'ductus bursa is',
'ductus bursae are', and 'ductus bursae is', so I was more confused.
Can someone please clarify this for me?

Sincerely,

-- 
Soowon Cho
chosoowon at gmail.com
Dept Plant Medicine
Chungbuk Nat'l Univ
Cheongju, 361-763
KOREA