monotypyn.
/ˈmɒnə(ʊ)ˌtʌɪpi/, U.S. /ˈmɑnəˌtaɪpi/ Taxonomy.
The property of a genus or other taxon of having (or of originally having) only one species or subordinate taxon within it.
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subtype1816
type1850
monotypy1931
1931 U. Grant & H. Gale in Mem. San Diego Soc. Nat. Hist. 1 502 Subgenus Bathytoma Harris and Burrows, 1891... Type (by monotypy), Murex cataphractus Brocchi, Pliocene, figured by Cossmann.
1944 Science 1 Sept. 190/2 Oscillaria Laveran, 1881... = Plasmodium Marchiafava & Celli, 1885, (type, P. malariae Laveran, 1881..; by monotypy).
1967 R. E. Blackwelder Taxon. xxv. 512 The genotype is automatically fixed by monotypy when the genus originally includes a single species.
1987 Nature 19 Nov. 252/1 Noncladistic taxa, with paraphyletic groups of highly variable size (including frequent monotypy), track patterns of diversity and extinction at the lineage level.
1995 Proc. Royal Soc. B. 261 334 We proposed to place it in a new genus here named: Atretochoana n.g. Type species: Typhlonectus eiselti Taylor, 1968, by monotypy.
This is a new entry (OED Third Edition, December 2002; most recently modified version published online March 2022).
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n.1931