endosarc

[ en-duh-sahrk ]

/ ˈɛn dəˌsɑrk /

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the endoplasm of a protozoan (opposed to ectosarc).

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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

First recorded in 1865–70; endo- + -sarc

en·do·sar·cous, adjective

The endosarc is semifluid and rich in granules mostly “reserve” in nature, often showing proteid or fat reactions.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 5|Various
(Gymnostomaceae); showing the reticulate arrangement of the endosarc, b, contractile vacuoles; c, the cuticle-lined pharynx.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 5|Various
The endosarc is full of food-granules and reserve-granules (oil, colouring matter and proteid).
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 5|Various
The Intracapsular Sarcode (endosarc) or surrounding internal protoplasm.
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia)|Ernst Haeckel

Note the small granules which move about within the endosarc.
Elementary Zoology, Second Edition|Vernon L. Kellogg