medialecithal

me·di·a·lec·i·thal

(mē'dē-ă-les'i-thăl), Denoting an egg with a moderate amount of yolk, as in amphibians. [L. medialis, medial, + G. lekithos, egg yolk]

mesolecithal

adjective Referring to eggs (e.g., of amphibia) that have a moderate amount of yolk.