- Kabylites
- Kachpurites
- Kalloclymenia
- Kamerunoceras
- Kammerkaroceras
- Kamptoclymenia
- Kamptokephalites
- Karaclymenia
- Karagandoceras
- Karamaiceras
- Karamaites
- Karangatites
- Karapadites
- Karaschiceras
- Kardailites
- Karlwaageites
- Karsteniceras
- Kashmirites
- Katacanites
- Katroliceras
- Katrolites
- Kayutoceras
- Kazakhoceras
- Kazakhoclymenia
- Kazakhstania
- Kazakhstanites
- Kazanskyella
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- Kellawaysites
- Kellnerites
- Kelteroceras
- Kenseyoceras
- Kepplerites
- Kerberites
- Keyserlingites
- Kheraiceras
- Kheraites
- Khvalynites
- Kiaclymenia
- Kielcensia
- Kilianella
- Kimoceras
- Kingites
- Kingoceras
- Kinkeliniceras
- Kiparisovia
- Kiparisovites
- Kirsoceras
- Kitchinites
- Klamathites
- Klematosphinctes
- Klipsteinia
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- Knemiceras
- Koenenites
- Kohaticeras
- Kokenia
- Koloceras
- Komioceras
- Koninckites
- Korythoceras
- Kosmermoceras
- Kosmoceras
- Kosmoclymenia
- Kossmatella
- Kossmatia
- Kossmaticeras
- Kozhimites
- Krafftoceras
- Kranaosphinctes
- Krumbeckia
- Kufengoceras
- Kumatostephanus
- Kurnubiella
- Kushanites
- Kutatissites
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