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protostome
This term is used exclusively within biological and zoological contexts to categorize animals based on their embryonic development. It describes a specific evolutionary lineage where the initial opening of the gastrula, known as the blastopore, develops into the mouth, while the anus forms later. This distinguishes these organisms from deuterostomes, such as chordates and echinoderms, where the blastopore becomes the anus.
Because it is a technical taxonomic classification, the word is typically found in academic textbooks, research papers, and scientific discussions. It carries a neutral, descriptive tone and is rarely used outside of specialized scientific discourse.
Meanings
Examples
An earthworm is a classic example of a protostome.
Is a snail considered a protostome or a deuterostome?
Is a snail considered a protostome or a deuterostome?
The blastopore develops into the mouth in every protostome.
I wonder if this specimen is a protostome based on its cleavage pattern.
Most invertebrates we studied today are categorized as protostomes.
The evolutionary split between the protostome and deuterostome lineages occurred millions of years ago.
The evolutionary split between the protostome and deuterostome lineages occurred millions of years ago.
Look at how the embryo develops in this protostome species.
Arthropods are among the most successful groups of protostomes on Earth.