著者

Soichiro Kawabe Yusuke Ando Shigenori Kawano Kumiko Matsui

出版者

Kitakyushu Museum of Natural History and Human History

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.19, pp.35-39, 2021-03-31 (Released:2021-04-24)

参考文献数

26

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A rostrum of a suliform bird from the Lower Oligocene Yamaga Formation of Ashiya Group in Ainoshima Island, Fukuoka Prefecture, Kyushu, southwestern Japan is briefly described. The present specimen (KMNH VP 600013) is slender and flat, with a strongly curved rostral tip, a sharply-defined longitudinal groove, and apertura nasi ossea that were likely extremely reduced or absent.

著者

Toshiro SARUWATARI Masamitsu IWATA Yoshitaka YABUMOTO Frensley D. HUKOM Teguh PERISTIWADY Yoshitaka ABE

出版者

Kitakyushu Museum of Natural History and Human History

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.17, pp.67-80, 2019-03-31 (Released:2020-09-15)

参考文献数

11

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Seventh specimen of Indonesian coelacanth, Latimeria menadoensis POUYAUD et al., 1999 was caught off Sulawesi, Indonesia on November 5, 2014. This specimen is a female, 1276 mm in standard length. Counts and measurements on the external morphology of the specimen was carried out by a team of Japanese and Indonesian researchers, providing the most comprehensive data on the morphology of this species. All available data on morphology of L. menadonesis is compiled together to provide insights into the biology and taxonomy of extant coelacanths.

著者

Francisco José Poyato-Ariza

出版者

Kitakyushu Museum of Natural History and Human History

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.3, pp.153-168, 2005-03-31 (Released:2021-03-10)

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The fishes from the Early Cretaceous (early Barremian) locality of Las Hoyas, in the Spanish province of Cuenca, are reviewed from a palaeoecological point of view. Las Hoyas was a permanent lake surrounded by actively interacting wetlands, with dry and humid cycles; no marine influence has been detected. A good number of the most generalized fishes from the lake, as well as small piscivore forms, would probably get into the wetlands in different extents throughout time, according to the availability of additional ecological space and food sources. Other fish taxa, such as the pycnodonts and the largest piscivores, must have had more physically restrained niches, probably somehow related with the humidity cycles in the palaeoenvironment. Juvenile fishes are largely represented in this locality, including events of mass mortality. The adults show a very interesting phenomenon of size reduction, probably related with environmental stress.The ecomorphologic overview of the fishes from the permanent waters of the Las Hoyas lake confirms that they must have occupied different niches, which, according to the lacustrine ecological spaces, can be grouped into:1) nekton related with the pleuston/plankton, such as the plankter Pleuropholis (Pholidophoriformes) or the surface insect-larvae eater Gordichthys (Chanidae), plus juvenile stages of many taxa, and possibly some other primitive teleosts that were plankton filters;2) nekton in strict sense, including the piscivore Caturus, Amiopsis, and Vidalamia (Amiidae); the water-bug eater Notagogus (Macrosemiidae); the shrimp-eater Lepidotes (Semionotidae), and ram feeder Rubiesichthys (Chanidae), plus a large amount of primitive teleosts, which constituted the major component of the Las Hoyas fish biomass;3) nekton related with the benthos, such as the predatory coelacanth cf. Holophagus and the pycnodonts Stenamara and Turbomesodon, adapted to a durophagous diet.A hypothesis of sexual dimorphism for the chanid teleost Rubiesichthys gregalis is proposed. Both morphotypes are discriminated by their relative body height only, and do not differ in any other morphometric, meristic, or anatomic character. They both occur in the same levels of the same localities, in about a 50-50% ratio for adult individuals, and there is no difference between the morphotypes and specimens from both known populations, El Montsec and Las Hoyas. Consequently, the two morphotypes of Rubiesichthys are interpreted as sexual dimorphs of a single species, R. gregalis. According to the variation found in Recent fishes, the higher-bodied morphotype is proposed to be the female dimorph, and the lower-bodied morphotype, the male dimorph. Differentiation of sexual dimorphs begins at about 20 mm; all specimens below that length show slender bodies only, and are considered juvenile.

著者

Masamitsu IWATA Yoshitaka YABUMOTO Toshiro SARUWATARI Shinya YAMAUCHI Kenichi FUJII Rintaro ISHII Toshiaki MORI Frensly D. HUKOM DIRHAMSYAH Teguh PERISTIWADY Augy SYAHAILATUA Kawilarang W. A. MASENGI Ixchel F. MANDAGI Fransisco PANGALILA Yoshitaka ABE

出版者

Kitakyushu Museum of Natural History and Human History

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.17, pp.57-65, 2019-03-31 (Released:2020-09-15)

参考文献数

16

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The juvenile of Indonesian coelacanth, Latimeria menadoensis is here described for the first time in detail with comparison to embryos of Latimeria chalumnae. The juvenile was found in free swimming at 164.6 m depth off Manado, Indonesia on the 6th October in 2009. Because the total length of the juvenile is 31.5 cm, which is smaller than the embryos of L. chalumnae, it is speculated that not much time has passed from its birth. The depth at which the juvenile was found is within the range of the depth where adult L. menadoensis were observed, hidden in a narrow and long overhang where large predators could not enter. The juvenile has a more slender body, smaller orbit, shorter and deeper posterior part of the body (caudal peduncle) between the second dorsal and the anal fins and anterior ends of the dorsal and ventral lobes of the caudal fin (the third dorsal and second anal fins), longer dorsal and ventral lobes of the caudal fin (the third dorsal and second anal fins), broader peduncles of broader lobed fins, larger first dorsal fin and longer supplementary lobe of the caudal fin (caudal fin) than embryos of L. chalumnae. This indicates clear differences in the first ontogenetic stages of the two species, although adults have almost the same morphological features. Latimeria menadoensis appears to reproduce in a rather confined area, because both the juvenile and adults have been found within the same area inside of Manado Bay.

著者

籔本 美孝 坂本 陽子 刘 焕章

出版者

北九州市立自然史・歴史博物館

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.8, pp.69-86, 2010-03-31 (Released:2021-05-05)

参考文献数

31

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The osteological description and illustrations of the cyprinid fish Xenocypris argentea from Taoyuan, Hunan Province and Guixi, Jiangxi Province, China are provided for studies on fossil cyprinid fishes found in East Asia and Japan including Iki Island, Nagasaki Prefecture, with brief comparison to a cultrin species, Hemiculter leucisculus and some other xenocyprinin genera and species.

著者

Camila CUPELLO Gaël CLÉMENT François J. MEUNIER Marc HERBIN Yoshitaka YABUMOTO Paulo M. BRITO

出版者

Kitakyushu Museum of Natural History and Human History

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.17, pp.29-35, 2019-03-31 (Released:2020-09-15)

参考文献数

38

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The evolutionary history of coelacanths is long and complex with indications of adaptations to different aquatic environments. Fossil coelacanths are registered in shallow brackish, fresh or marine waters, while extant coelacanths inhabit moderate deep marine environments. Here we review some evidences of this long-time adaptation to moderate deep waters, focusing mainly on the hypothesis of bimodal respiration (gas exchange through gills and lungs) in most fossil coelacanths and on the aquatic gas exchange and the presence of a non-functional lung in the extant coelacanth Latimeria chalumnae. Another morphological evidence is the high rate of lipid accumulation in the whole body of L. chalumnae.

著者

Brito Paulo M. Yabumoto Yoshitaka

出版者

北九州市立自然史・歴史博物館

雑誌

北九州市立自然史・歴史博物館研究報告A類(自然史) (ISSN:13482653)

巻号頁・発行日

vol.9, pp.107-136, 2011

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<p>The Lower Cretaceous Crato and Santana formations have provided one of the richest Mesozoic fish faunas from South America. An updated review of this ichthyofauna, comprising, 28 nominal species, is presented here. Contrary to the previous idea that the Araripe Basin had an endemic fauna related to the opening of the South Atlantic Ocean, it is now accepted that this fauna is instead related to that of the Tethys. A marine connection with the Araripe Basin is indicated by the presence of species closely related to those of other assemblages occurring in the western part of the Tethys. However, the absence of marine invertebrates suggests non-marine conditions for this basin, with only intermittent connections to the epicontinental seaway. Some of the fishes found in the Crato Formation are juveniles of the species found in the Santana Formation, suggesting several important paleoecological implications related to the reproduction of these fishes and using there as a nursery.</p>