Otozamites toshioensoi Tosh.Yamada, J.Legrand et H.Nishida

Plant Fossil Names Registry Number: PFN000707

Act LSID: urn:lsid:plantfossilnames.org:act:707

Authors: T. Yamada, J. Legrand & H. Nishida

Rank: species

Reference: Yamada, T., Legrand, J. & Nishida, H. (2018): Late Early Cretaceous (Albian) Sasayama Flora from the Sasayama Group in Hyogo Prefecture, Japan. – Paleontological Research 22(2): 112–128., link

Page of description: 116

Illustrations or figures: figs 2I, J, 3A–C

Types

Original diagnosis/description

Leaf linear, pinnate, bearing leaflets alternately at 30 to 60 degrees to rachis. Rachis almost completely concealed by leaflets. No overlap between adjacent leaflets on same side of rachis. Leaflets slightly falcate. Auricle on acroscopic leaflet base prominently developed, reaching other side of rachis. Leaflet apices broadly rounded to obtuse. Leaflet margin distinctly thickened. Six to seven veins initiated from leaflet attachment. Veins bifurcate more than once. Vein density ca. 3 to 4 per mm at maximum.

Etymology

Commemorating the late Toshio Enso who first reported plant fossils from the Sasayama Group.

Stratigraphy

Cretaceous, Lower Cretaceous, Albian
Upper Formation of the Sasayama Group

Albian or Cenomanian ages have previously been proposed for the Upper Formation of the Sasayama Group by radiometric datings, but an Albian age is preferred here in regards to the extremely rare occurrence of possible angiosperms.

Locality

Japan
Ojiyama and Sasayama Castle, Sasayama City (Sasayama basin), Hyogo Prefecture