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Genus Shimodaia MacKinnon, Saito & Endo, 1997 |
| [Type species= Shimodaia pterygiota MacKinnon, Saito & Endo, 1997 (p. 226)] |
* Small, red to white color markings, ovate, commissure rectimarginate; beak erect, attrite; foramen submesothyrid; deltidial plates disjunct. Dental plates recessive, pedicle collar long, sessile. Cardinal process inconspicuous; septal pillar arising (in adults) about midvalve, very long and narrow, strongly inclined anteroventrally, sometimes spinose distally, extending posteriorly as low ridge; hinge trough with incipient inner hinge plates; adult loop annular with descending branches attached to septal pillar and ascending branches commonly incomplete; juvenile axial loop phase with well-developed septal flanges. ** Shells small, commonly with red/white markings. Adult loop annular. Dorsal pedicle adjustor muscle scars broad, occupying floor of hinge trough. |
| Present
* Diagnosis from volume 5 of the Treatise on Invertebrate Paleontology (2006) ** Diagnosis from MacKinnon & Long (2009)
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| Extant Species of Shimodaia |
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Diagnosis Diagnosis |
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Shimodaia pterygiota MacKinnon, Saito & Endo, 1997 Type locality: Off Shimoda (Japan) Diagnosis (MacKinnon, Saito & Endo, 1997) As for genus - [Nota: there is a gap in the diagnosis of this species because the diagnosis of the genus given in 1997 is different from that publishied in 2009] |
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Shimodaia macclesfieldensis MacKinnon & Long, 2009 Type locality: Macclesfield Bank (China Sea) A Shimodaia with ascending loop elements forming a complete ring that attains no more than approximately half the width of the descending lamellae. |