Studied material. AMNH = American Museum of Natural History. MCM = Mikasa City Museum. YNU = Yokohama National University. PIM = Paleontological Institute and Museum, University of Zurich. NMNS = National Museum of Nature and Science (Japan). UMUT = University Museum, University of Tokyo.

Studied material. AMNH = American Museum of Natural History. MCM = Mikasa City Museum. YNU = Yokohama National University. PIM = Paleontological Institute and Museum, University of Zurich. NMNS = National Museum of Nature and Science (Japan). UMUT = University Museum, University of Tokyo.

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Hatching size has been considered of great importance in the evolution of externally shelled cephalopods. However, our knowledge of how hatching size varies in response to biotic and abiotic factors is largely lacking. We present a comprehensive overview of hatching size in all known species of modern nautilids (225 specimens, representing eight sp...

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... examined a total of 225 conchs of modern nautilid specimens including the following species: Allonautilus perforatus (Conrad, 1847), Allonautilus scrobiculatus (Sowerby, 1849), Nautilus macromphalus Sowerby, 1849, N. stenomphalus Sowerby, 1849, N. pompilius Linnaeus, 1758, N. pompilius suluensis Habe & Okutani, 1988, N. belauensis Saunders, 1981, and N. repertus Iredale, 1944. Details of the studied material are summarized in Table 1. All specimens were CT-scanned at different research institutions, which yielded image stacks. ...

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