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Volume 1996 (1996)
- Issue 184 Pages 555-
- Issue 183 Pages 485-
- Issue 182 Pages 413-
- Issue 181 Pages 337-
Volume 1996, Issue 183
Displaying 1-7 of 7 articles from this issue
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MICHIKO SAITO1996 Volume 1996 Issue 183 Pages 485-499
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSAbstract. The early loop ontogenies of nine Recent laqueid species from Japanese waters were examined using scanning electron microscopy. Although juvenile specimens representing certain early loop stages were not available for some species, all the examined species appear to share roughly the same early stages of loop development as described by Richardson (1975). However, some differences and characteristic features exist in the early stages of loop ontogeny, such as the disposition of the septal flanges and presence or absence of septal bifurcation, characters which appear to be invariable at the genus level. A prime example is the case of the affinity between Laqueus and Frenulina, which have occasionally been included in the same subfamily. Inspections of loop morphology of early growth stages, especially of the above characters, indicate that these two genera may not be as closely related as previously thought. Comparison of relative timing of loop development as standardized by shell length reveals some variation within a species, but no major variation among species. Heterochrony is evident in one laqueid species, 'Frenulina' sp., in which adult individuals have a loop of juvenile morphology in other species.View full abstractDownload PDF (6949K) -
HISAYOSHI KATO1996 Volume 1996 Issue 183 Pages 500-521
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSSeventeen fossil decapods are described from the Miocene of the Chichibu Basin, Saitama Prefecture, Central Japan. The decapods occur in the Ushikubitoge Formation, Nagura Formation and Yokoze Formation. The following five are new : Trachycarcinus inflatus, Cancer sakamotoi, Itoigawaia chichibuensis, Maja morii, Miosesarma nagurense. Six decapod assemblages are recognized in the basin. The fauna is characterized by the predominance of muddy bottom inhabitants of the lower sublittoral zone, represented by the Miosesarma nagurense sp. nov. assemblage from the Nagura Formation. The occurrence of Maja morii sp. nov. is the first fossil record of the genus from the northern Pacific region.View full abstractDownload PDF (6497K) -
SHUJI NIKO, ALAIN PILLEVUIT, TAMIO NISHIDA1996 Volume 1996 Issue 183 Pages 522-527
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSAbstract. The Wordian Rustaq Formation is a unit of the Hawasina Nappes in the central Oman Mountains, and contains a diverse pelagic fauna. Four species of non-ammonoid cephalopods are described herein : orthocerids Brachycycloceras rustaqense sp. nov. and Bitaunioceras cf. zonatum (Gemmellaro), nautilid Liroceras sp. and bactritid Bactrites? sp. One of these, Brachycycloceras rustaqense, represents the youngest record of the genus, previously known unquestionably only from the Carboniferous. The fauna indicates affinity to the Timor and Sicily faunas.View full abstractDownload PDF (2007K) -
FUMIO KOBAYASHI1996 Volume 1996 Issue 183 Pages 528-539
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSThis paper concerns the systematic paleontology and faunal comparison of newly found Anisian foraminifers in the Kaizawa Formation distributed in the Iwai-Kanyo area, southern Kanto Mountains. The Nishitama Group including the Kaizawa Formation in the northern part of Itsukaichi is a coherent stratigraphic unit ranging in age from the latest Permian to possibly Early Jurassic. The formation shows many diagnostic lithologic characters indicating shallow shelf deposits, and is quite different from those of the surrounding Jurassic formations containing numerous exotic blocks of oceanic origin. The foraminiferal fauna consists of 25 species assignable to 16 genera having a close Tethyan faunal affinity. Among them, Glomospira densa (Pantic) and Meandrospira dinarica Kochansky-Devide and Pantic are especially important stratigraphically as well as biogeographically, because they are zonal indicators restricted to the Anisian of the Muschelkalk and contemporaneous limestones in Europe to West Asia. Most of the other species are common to those reported from the Middle Triassic of the Tethyan Realm.View full abstractDownload PDF (3618K) -
TATSURO MATSUMOTO1996 Volume 1996 Issue 183 Pages 540-543
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSInoceramus kamuy Matsumoto and Asai has been recently established on a number of specimens from the Lower Turonian of Hokkaido (Matsumoto and Asai, 1996). There is, furthermore, another little known species from the lower part of the Turonian in Hokkaido. A short note is given here on it.View full abstractDownload PDF (1375K) -
SHUJI NIKO, ALAIN PILLEVUIT, TAMIO NISHIDA1996 Volume 1996 Issue 183 Pages 544-546
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSThe aulacocerid cephalopod species Atractites arabicus sp. nov. was discovered from a limestone conglomerate exposed in the "Rustaq Ouest" area, approximately 5 km west of Rustaq village, central Oman Mountains. This area is characterized by the presence of the thrust sheets, called Hawasina Nappes, of Tethyan origin formed during the Late Cretaceous obduction of ophiolite complex onto the Arabian continental margin (e. g., Robertson and Searle, 1990). The limestone conglomerate overlies siliciclastic sequences containing Halobia, and is situated in the basal portion of the Hawasina Nappes (Pillevuit, 1993).The specimens studied are deposited in the Paleontological collections of Geological Museum of Lausanne (MGL), Switzerland.View full abstractDownload PDF (893K) -
ZAW WIN, SUMIO SAKAGAMI1996 Volume 1996 Issue 183 Pages 547-550
Published: September 30, 1996
Released on J-STAGE: May 25, 2010
JOURNAL FREE ACCESSDownload PDF (1299K)
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