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Komura, S. (1997). Additional descriptions of the new diatoms from the Miocene Nabuto Formation, central Japan. Diatom. 13: 63-81.
240912
Komura, S.
1997
Additional descriptions of the new diatoms from the Miocene Nabuto Formation, central Japan.
Diatom
13: 63-81
Publication
Available for editors  PDF available [request]
Five new genera are described from observations by SEM and they are all monotypic: (1)Streptommion torsivum represents a linear, twisted araphid with occelli of different sizes on each apical mantle; (2) Sagittula transversaria is also an araphid like Eunotogramma, carrying on the ventral mantle a distinctive wall organelle similar to a rimoportula; (3) Gyropandorus annulatus involves a naviculoid having the axial raphe reduced within the panduriform hoop of alveolar rows on the valve; (4) Apterosoma translucida, similar to a Plagiotropis in gross morphology, is characterized by a canal raphe system which lacks fibulae and helictoglossae; finally (5) Eupterotrum pulcherum bears a close resemblance to Entornoneis but differs in the framework of alar canal and by having the elaborate girdle bands. Rimobulla is explained in detail as a new organelle within the mantle wall and is compared to the rimoportula.
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Date
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2016-09-28 09:06:38Z
created

Apterosoma S.Komura, 1997 † (original description)
Apterosoma translucidum S.Komura, 1997 † (original description)
Eupterotrum S.Komura, 1997 † (original description)
Eupterotrum pulchrum S.Komura, 1997 † (original description)
Gyropandorus S.Komura, 1997 † (original description)
Gyropandorus annulatus S.Komura, 1997 † (original description)
Sagittula S. Komura, 1997 (original description)
Sagittula transversaria S.Komura, 1997 † (original description)
Streptommion S.Komura, 1997 † (original description)
Streptommion torsivum S.Komura, 1997 † (original description)
 Environment

Recovered from the Miocene marine sediments of the Nabuto Formation distributed in the Boso Peninsula. [details]

 Environment

Recovered from the Miocene marine sediments of the Nabuto Formation distributed in the Boso Peninsula. [details]

 Environment

Recovered from the Miocene marine sediments of the Nabuto Formation distributed in the Boso Peninsula. [details]

 Environment

Recovered from the Miocene marine sediments of the Nabuto Formation distributed in the Boso Peninsula. [details]

 Environment

Recovered from the Miocene marine sediments of the Nabuto Formation distributed in the Boso Peninsula. [details]

 Holotype

TNS-MPC 5070 ( National Science Museum, Tsukuba) [details]

 Holotype

TNS-MPC 5071 (National Science Museum, Tsukuba) [details]

 Holotype

TNS-MPC 5069 (National Science Museum, Tsukuba) [details]

 Holotype

TNS-MPC 5068 (National Science Museum, Tsukuba) [details]

 Holotype

TNS-MPC 5067 (National Science Museum, Tsukuba) [details]

 Type locality

Nabuto beach, Boso Peninsula. [details]

 Type locality

Nabuto beach, Boso Peninsula [details]

 Type locality

Nabuto beach, Boso Peninsula. [details]

 Type locality

Nabuto beach, Boso Peninsula [details]

 Type locality

Nabuto beach, Boso Peninsula. [details]

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