TY - JOUR
T1 - Cretaceous amber fossils highlight the evolutionary history and morphological conservatism of land snails
AU - Hirano, Takahiro
AU - Asato, Kaito
AU - Yamamoto, Shûhei
AU - Takahashi, Yui
AU - Chiba, Satoshi
N1 - Funding Information:
We thank T. Kushibiki for micro-CT scanning in Shimadzu Corporation, Kyoto. We also thank M. Gunji for permitting and scanning micro-CT in Tsukuba Research Departments of the National Museum of Nature and Science, Tokyo. We thank Z. Fehér (Cochlostoma achaicum coeruleum), O. Kagawa (Cyclophorus oshimanus and Pupinella rufa), K. Nishi (Diplommatina tanegashimae kyushuensis), B. Páll-Gergely (Pseudopomatias maasseni), S. Uchida (Ogasawarana sp.), D. Yamazaki (Lagocheilus sp., Japonia sp. and Euhadra grata), and the Academy of Natural Sciences of Drexel University (Aperostoma burringtoni, Cyathopoma africanum, Diplommatina electa, Diplommatina immersidens, and Hainesia litturatum) for providing some photographs of the extant species in Figs 1 and 6. We thank C.E. Parent, J.G. Phillips and K. Castelin for the English editing and variable comments. S.Y. was supported by a Japan Society for the Promotion of Science (Tokyo, Japan) Overseas Research Fellowship (No. 29–212). Finally, we thank C.D. Raheem, and two anonymous referees for the helpful suggestions.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Other than hard bones and shells, it is rare for soft tissues to fossilize, but occasionally they are well-preserved in amber. Here, we focus on both modern and fossilized species of the land snail superfamily Cyclophoroidea. Phylogenetic relationships within the Cyclophoroidea were previously studied using extant species, but timing of divergence within the group remains unclear. In addition, it is difficult to observe morphological traits such as the chitinous operculum and periostracum of fossil snails due to their poor preservation potential. Here we describe nine species including a new genus and five new species of well-preserved fossil cyclophoroideans from the mid-Cretaceous Burmese amber. These fossils include not only the shell, but also the chitinous operculum and periostracum, soft body, and excrements. We present the first estimation of divergence time among cyclophoroidean families using fossil records and molecular data, suggesting extreme morphological conservatism of the Cyclophoroidea for nearly 100 million years.
AB - Other than hard bones and shells, it is rare for soft tissues to fossilize, but occasionally they are well-preserved in amber. Here, we focus on both modern and fossilized species of the land snail superfamily Cyclophoroidea. Phylogenetic relationships within the Cyclophoroidea were previously studied using extant species, but timing of divergence within the group remains unclear. In addition, it is difficult to observe morphological traits such as the chitinous operculum and periostracum of fossil snails due to their poor preservation potential. Here we describe nine species including a new genus and five new species of well-preserved fossil cyclophoroideans from the mid-Cretaceous Burmese amber. These fossils include not only the shell, but also the chitinous operculum and periostracum, soft body, and excrements. We present the first estimation of divergence time among cyclophoroidean families using fossil records and molecular data, suggesting extreme morphological conservatism of the Cyclophoroidea for nearly 100 million years.
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U2 - 10.1038/s41598-019-51840-3
DO - 10.1038/s41598-019-51840-3
M3 - Article
C2 - 31685840
AN - SCOPUS:85074360503
VL - 9
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 15886
ER -