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Bull. Tokushima Pref. Mus.
No. 22 : 157-160, 2012

【Report】

Donation and registration of the Late Cretaceous ammonoid Libycocerasand Late Devonian plant Leptophloeum
to the Tokushima Prefectural Museum
Yasuyuki Tsujino

1

Abstract : The Late Cretaceous ammonoid Libycoceras and Late Devonian plant
Leptophloeum were donated to the Tokushima Prefectural Museum. These specimens,
which have been presented in published papers, are the holotype of Libycoceras
awajiense Matsumoto and Morozumi, 1985 and a first recorded fossil of Leptophoeum
rhombicum (Dawson, 1862) from Tokushima Prefecture. The specimens are now housedin the museum and have been assigned new registration numbers.
Key words : Private collection, type specimen, illustrated specimen, Izumi Group,
Kurosegawa Belt

IntroductionFive paleontological specimens, which consist of the Late Cretaceous ammonoid Libycoceras
awajiense Matsumoto and Morozumi, 1988 from the Izumi Group in Awaji Island of Hyogo
Prefecture and the Late Devonian plant Leptophoeum rhombicum (Dawson, 1862) from theKurosegawa Belt of Tokushima Prefecture, were recently donated to the Tokushima Prefectural
Museum by Mr. Masahiko Takada and Mr. Noboru Okitsu, respectively (Table 1). These specimens
have been exhibited in published academic papers (Matsumoto and Morozumi, 1988; Yasui andOkitsu, 2007). The specimen of L. awajiense is the holotype described by Matsumoto and Morozumi(1988) (Fig. 1). In addition, the specimens of L. rhombicum were presented in Yasui and Okitsu(2007) as the first recorded Late Devonian plant from Tokushima Prefecture (Fig. 2). The specimens
were originally stored as privately owned collections, although, in particular, the type specimens suchas the holotype should be preserved in an institution that maintains a research collection based on theInternational Code of Zoological Nomenclature. I report herein that the specimens donated to theTokushima Prefectural Museum have been assigned new registration number (Table 1).
Table 1. List of paleontological specimens donated to the Tokushima Prefectural Museum. Private collection number andnew registration numbers of each specimen are shown.
Species namePrivate collection number New registration number

Figure in a published paper

Libycoceras awajiense―TKPM.GFI5196

Matsumoto and Morozumi, 1985, figures 1 and 2

Leptophloeum rhombicum

KT-l3021

TKPM.GFI1172

Yasui and Okitsu, 2007, Fig 3.1

Leptophloeum rhombicum

KT-13037B

TKPM.GFI1173

Yasui and Okitsu, 2007, Fig 3.2a, b

Leptophloeum rhombicum

KT-13003

TKPM.GFI1174

Yasui and Okitsu, 2007, Fig 3.3a, b

Leptophloeum rhombicum

KT-13023

TKPM.GFI1176

Yasui and Okitsu, 2007, Fig 3.4a, b

Received 30 January, 2012 ; Accepted 28 February, 2012.
1 Tokushima Prefectural Museum, Bunka-no-Mori Park, Hachiman-cho, Tokushima 770-8070, Japan.

― 157 ―

Yasuyuki Tsujino

Data related to the donated specimens and their new registration number
Libycoceras awajiense Matsumoto and Morozumi, 1988
An ammonoid was discovered by Mr. Masahiko Takada. It was found in the Seidan Formation ofthe Upper Cretaceous Izumi Group, which is composed fine-sandy siltstone, in the Nagata area, ofMinami-Awaji City, Hyogo Prefecture during 1985-1987 when the Honshu-Shikoku Expressway wasconstructed. Following that, the ammonoid was introduced as a new species Libycoceras awajiense byMatsumoto and Morozumi (1988). Until now, L. awajiense has been known as a singular specimen of
the holotype as well as the sole example assigned to the family Sphenodiscid ammnoid from Japan.
The holotype of L. awajiense is housed in the Tokushima Prefectural Museum under TKPM. GFI5196 as a new registration number (Table 1; Fig. 1).
Leptophloeum rhombicum (Dawson, 1862)
The Late Devonian plant assigned to genus Leptophloeum was discovered by Mr. Noboru Okitsu
from the “Suberidani lenticular body” of the Kurosegawa Belt in Katsuura Town, Tokushima
Prefecture. The four specimens illustrated in Yasui and Okitsu (2007) were donated to the Tokushima
Prefecture Museum, although the twelve specimens were actually obtained from fine-grainedsandstone in the Suberidani area. These specimens are the first record of the Late Devonian plant
Leptophloeum from Tokushima Prefecture. Occurrence of Leptophloeum showed the presence of theUpper Devonian strata in Tokushima Prefecture.
The four specimens of Leptophloeum rhombicum numbered KT-l3021, 13037B, 13003 and 13023
have been newly registered as TKPM. GFI1172, 1173, 1174 and 1176, respectively (Table 1; Fig. 2).

Fig. 1. Libycoceras awajiense Matsumoto and Morozumi, 1988, TKPM.GFI5196. A: Ventral view. B: Left lateral view.
C: Apertural view.

― 158 ―

Donation and registration of Late Cretaceous ammonoid and Late Devonian plantFig. 2. Leptophoeum rhombicum (Dawson, 1862). A: TKPM.GFI1172. B: TKPM.GFI1173. C: TKPM.GFI1174. D:TKPM.GFI1176.

Acknowledgments
I would like to thank Mr. Masahiko Takada (Natural History Museum, Kishiwada City) and Mr.
Noboru Okitsu (Anan City, Tokushima) for donation of the specimens. I greatly appreciate Mr. Angus
A. McDonald (University of Tokushima) for improvement of the English text.
― 159 ―

Yasuyuki Tsujino

References
Dawson, J. W. 1862. On the flora of the Devonian Period in north-eastern America. Quarterly Journal of the GeologicalSociety, 18, 296-330.
Matsumoto, T. and Y. Morozumi. 1985. A Sphenodiscid ammonite acquired rarely from the Cretaceous of Japan.
Transactions and Proceedings of the Palaeontological Society of Japan, New Series, (150) : 465-475.
Yasui, T. and N. Okitsu. 2007. Discovery of Late Devonian plant Leptophloeum from the Suberidani area in theKurosegawa Belt, Tokushima Prefecture, southwest Japan. Journal of the Geological Society of Japan, 113(1) : 1518. (In Japanese, English abstracts)

摘要

徳島県立博物館に寄贈された後期白亜紀アンモノイド Libycoceras
および後期デボン紀植物 Leptophloeum の登録辻野泰之

1後期白亜紀アンモノイド Libycoceras および後期デボン紀植物 Leptophloeum が徳島県立博物館に寄贈された．これらの標本は，すでに論文中で紹介されたものであり，Libycoceras awajiense のホロタイプおよび徳島県から初めて記録された Leptophoeum rhombicum である．これらの標本は，徳島県立博物館に収蔵され，新しい登録番号が与えられた．
（1 徳島県立博物館，〒770-8070 徳島市八万町，文化の森総合公園）― 160 ―