TT #93 · Parshas Shemini · Aliyah 5 · Passuk 2
Chabad.org — Vayikra Chapter 11 with Rashi
English: “Which is upon the earth”: the verse teaches that the permitted animal signs apply to creatures of the land, not to creatures of the sea regardless of their signs.
Sifra (Toras Kohanim), Shemini, Section 2.
Sefaria — Sifra, Shemini, Section 2
Textual limitation — The Chazal derives the teaching from the wording or classification in the verse.
The phrase “that is on the land” excludes sea creatures from this category.