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Trigonostoma (Extractrix)
Taxonomy
Pseudomalaxis (Extractrix) was named by Korobkov (1955) [TAXONOMIC COMMENTS: Originally placed in Pseuomalaxis (Architectonicidae) by Boettger, type species from Miocene of Romania. Placed in Cancellariidae with some uncertainty by Olsson (1967). Largely a form taxon. Type was lost by Cossmann during World War I.].
It was Trigonostoma (Extractrix) by Olsson (1967) and Todd (2001).
It was assigned to Pseudomalaxis by Korobkov (1955); and to Trigonostoma by Olsson (1967) and Todd (2001).
It was Trigonostoma (Extractrix) by Olsson (1967) and Todd (2001).
It was assigned to Pseudomalaxis by Korobkov (1955); and to Trigonostoma by Olsson (1967) and Todd (2001).
Species lacking formal opinion data
Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Subg. †Trigonostoma (Extractrix) Korobkov 1955
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†Trigonostoma (Extractrix) hoerlei Olsson 1967
Diagnosis
No diagnoses are available