Polyptychoceras is an extinct genus of ammonites from the Late Cretaceous of Asia, Europe, and North and South America. It was first named by Hisakatsu Yabe in 1927.
Polyptychoceras is an extinct genus of ammonites from the Late Cretaceous of Asia, Europe, and North and South America. It was first named by Hisakatsu Yabe in 1927.
==Species and subspecies== This genus contains the following eight species and one subgenus, Subtychoceras, which contains one species. Polyptychoceras mihoense Polyptychoceras pseudogaultinum, could reach a length of 100 – 120 mm Polyptychoceras haradanum (Yokoyama) Polyptychoceras obatai Polyptychoceras obliquecostatum Polyptychoceras subunduratum Polyptychoceras obstrictum (Jimbo) Polyptychoceras vancouverensis, located around the Trent and Puntledge Rivers. Due to its shape, fossil poachers often call it the "paperclip ammonite" or "candy cane". Polyptychoceras (Subptychoceras) yubarense, could reach a maximum length of 200 mm
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).