Bibliography and Index of the Sirenia and Desmostylia  

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"Sawamura, Hiroshi"

Sawamura, Hiroshi: SEE ALSO Kimura et al., 1998; Inuzuka et al., 2000. (detail)
 
D
 Kimura, Masaichi; Yahata, Masahiro; Sawamura, Hiroshi; Segawa, Isao; Suzuki, Akihiko; Muraishi, Yasushi (detail)
   
1998
The vertebrate fossils and their horizon from Akan-cho, eastern Hokkaido, Japan.
Earth Science (Chikyu Kagaku) 52(1): 44-50. 1 tab. 3 figs. 1 pl. Jan. 1998.
–In Japanese. Repr.: Research report on Akan vertebrate fossils (first report), Akan City Board of Education, Akan Vertebrate Fossil Study Group, March 2000, pp. 14-20.
 
D
 Inuzuka, Norihisa; Kimura, Masaichi; Kohno, Naoki; Sawamura, Hiroshi (eds.) (detail)
   
2000
Evolution of Desmostylia: incorporating the Proceeding[s] of the Desmostylian Symposium of the Fossil Research Society of Japan 16th Annual Meeting held at the Ashoro Museum of Paleontology, Hokkaido, Japan, 22-23 August 1998.
Bull. Ashoro Mus. Pal. No. 1: 1-172. Mar. 29, 2000.
–Includes a Preface by the editors (p. 7), and 12 papers, 11 of which are listed in this bibliography under their authors: Inuzuka (2), Ogasawara, Yahata & Kimura, Yahata, Igarashi et al., Taru, Kohno, Uno, Yamazaki & Umeda, and Yamazaki & Ikeuchi. Another paper, by Akihiko Suzuki (pp. 57-66), is on Miocene molluscan faunas and mentions desmostylians only in fig. 2.
 
D
 Sawamura, Hiroshi (detail)
   
2001
Comparison of the vertebral position of mounted Keton skeletons of Desmostylus.
Bull. Ashoro Mus. Pal. 2: 27-32. 7 figs. Mar. 30, 2001.
–In Japanese; Engl. summ. Compares the vertebral formulae in the skeletal restorations of the Keton Desmostylus specimen by Nagao, Kamei, and Inuzuka.
 
D
 Inuzuka, Norihisa; Sawamura, Hiroshi; Watanabe, Hitoshi (detail)
   
2006
Paleoparadoxia and the Nishikurosawa specimen from Oga, Akita, northern Japan.
Ann. Rept. Akita Pref. Mus. No. 31: 1-28. 3 tabs. 14 figs. 1 pl. Mar. 2006.
 
D
 Inuzuka, Norihisa; Sawamura, Hiroshi; Kawano, Shigenori; Kawano, Takashige (detail)
   
2009
Fossil footprints of a large tetradactyl mammal from the Lower Miocene in Hizen-cho, Karatsu city, Saga Prefecture, western Japan.
Jour. Fossil Research 41(2): 76-81. 1 tab. 8 figs.
–In Japanese; Engl. summ.
 
D
 Hayashi, Shoji; Houssaye, Alexandra; Nakajima, Yasuhisa; Chiba, Kentaro; Ando, Tatsuro; Sawamura, Hiroshi; Inuzuka, Norihisa; Kaneko, Naotomo; Osaki, Tomohiro (detail)
   
2013
Bone inner structure suggests increasing aquatic adaptations in Desmostylia (Mammalia, Afrotheria).
PLoS ONE 8(4):e59146. 20 pp. 5 tabs. 13 figs. + Supplementary Information. DOI:10.1371/journal.pone.0059146 Apr. 2, 2013.
–ABSTRACT: BACKGROUND: The paleoecology of desmostylians has been discussed controversially with a general consensus that desmostylians were aquatic or semi-aquatic to some extent. Bone microanatomy can be used as a powerful tool to infer habitat preference of extinct animals. However, bone microanatomical studies of desmostylians are extremely scarce. METHODOLOGY/PRINCIPAL FINDINGS: We analyzed the histology and microanatomy of several desmostylians using thin-sections and CT scans of ribs, humeri, femora and vertebrae. Comparisons with extant mammals allowed us to better understand the mode of life and evolutionary history of these taxa. Desmostylian ribs and long bones generally lack a medullary cavity. This trait has been interpreted as an aquatic adaptation among amniotes. Behemotops and Paleoparadoxia show osteosclerosis (i.e. increase in bone compactness), and Ashoroa pachyosteosclerosis (i.e. combined increase in bone volume and compactness). Conversely, Desmostylus differs from these desmostylians in displaying an osteoporotic-like pattern. CONCLUSIONS/SIGNIFICANCE: In living taxa, bone mass increase provides hydrostatic buoyancy and body trim control suitable for poorly efficient swimmers, while wholly spongy bones are associated with hydrodynamic buoyancy control in active swimmers. Our study suggests that all desmostylians had achieved an essentially, if not exclusively, aquatic lifestyle. Behemotops, Paleoparadoxia and Ashoroa are interpreted as shallow water swimmers, either hovering slowly at a preferred depth, or walking on the bottom, and Desmostylus as a more active swimmer with a peculiar habitat and feeding strategy within Desmostylia. Therefore, desmostylians are, with cetaceans, the second mammal group showing a shift from bone mass increase to a spongy inner organization of bones in their evolutionary history.
Daryl P. Domning, Research Associate, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, and Laboratory of Evolutionary Biology, Department of Anatomy, College of Medicine, Howard University, Washington, D.C. 20059.
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