単たん孔こう類るい

た

ん

こ

う

る

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Meanings

1

noun

monotremes; Monotremata

zoology

Zoological term for the order of egg-laying mammals, including the platypus and echidnas. Used in scientific and educational contexts.

カモノハシ
A specific monotreme species (platypus), while 単孔類 refers to the entire order.
ハリモグラ
Another monotreme species (echidna); 単孔類 is the broader taxonomic group.

From 単孔 (single opening, referring to the cloaca) + 類 (category, order). The term is a direct calque of the scientific concept.