1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
ARTHROPODA. The Arachnida form a distinct class or line of descent in the grade Euarthropoda, diverging (perhaps in common at the start with the Crustacea) from primitive Euarthropods, which gave rise also to the separate lines of descent known as the classes Diplopoda, Crustacea, Chilopoda and Hexapoda. FIG. i. — Entosternum, entosternite or plastron of I.imulus polyphemus, Latr. Dorsal surface.
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- Vol. 2, pp. 287-287