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protostoma
protostoma n.
Brit. 
/prə(ʊ)ˈtɒstəmə/
, /prə(ʊ)ˈtɒstəmə/U.S. /proʊˈtɑstəmə/
[after German Protostoma ( Haeckel Anthropogenie (ed. 3, 1877) xiv. 356)] Embryology (now disused) (Haeckel's name for) the opening into the internal cavity (archenteron) of a gastrula; = blastopore n. at blasto- comb. form ./proʊˈtɑstəmə/ΚΠ
1879 tr. E. Haeckel Evol. Man I. 194 I shall call the central cavity of the Gastrula-body the primitive intestine (protogaster), and its opening the primitive mouth (protostoma).
1900 Philos. Trans. (Royal Soc.) B. 193 323 (note) In the Vertebrate embryo, the mouth, neurenteric canal, and anus, are morphologically persisting portions of the protostoma.
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