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Occurrence of the isopod Archaeoniscus coreaensis new species from the Lower Cretaceous Jinju Formation, Korea

Published online by Cambridge University Press:  20 May 2016

Tae-Yoon Park ,
George D. F. Wilson ,
Dong-Chan Lee  and
Duck K. Choi
Tae-Yoon Park
Affiliation:
Australian Museum, 6 College Street, Sydney, NSW 2010, Australia, ; Present address: Division of Polar Earth System-Science, Korea Polar Research Institute, Incheon 406-840, Korea
George D. F. Wilson
Affiliation:
Australian Museum, 6 College Street, Sydney, NSW 2010, Australia, ;
Dong-Chan Lee
Affiliation:
Department of Heritage Studies, Daejeon Health Sciences College, Daejeon 300-711, Korea,
Duck K. Choi
Affiliation:
School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, Korea,
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Abstract

The fossil isopod crustacean genus Archaeoniscus has been known to occur in England, France and Germany during the Upper Jurassic, and in Mexico and Egypt during the Lower Cretaceous. The morphology of this genus is unique in having dorsoventrally compressed body, the cephalon set deeply into the first pereionite, pleon as wide as pereion, and a broad semicircular pleotelson. These features have resulted in placing the classification of the genus in the monotypic family Archaeoniscidae. However, due to the lack of detailed morphological data, suprafamilial classification of this genus has remained unclear, as well as its ecology and lifestyle. Here we report Archaeoniscus coreaensis n. sp. from the Jinju Formation, Gyeongsang Basin, Korea. The occurrence of Archaeoniscus in the East Asia implies that the genus may have had a worldwide distribution. The Gyeongsang Basin was a Cretaceous backarc basin, which consists of exclusively non-marine sedimentary sequences. The occurrence of this genus, therefore, indicates that Archaeoniscus successfully adapted to a freshwater ecosystem as well. Detailed anatomy including antennulae, antennae, pereiopods, and uropods was observed from well-preserved multiple specimens, which allows better understanding of the morphology of Archaeoniscus. The axial structure in the posterior part of the body, which was previously interpreted as a unique brood pouch characterizing the family, turned out to be a remnant of the hindgut. Females of all isopods and most of the members of the superorder Peracarida have a thoracic ventral brood pouch, modified from the thoracic coxal endites. Based on the morphology of the largely unmodified ambulatory pereiopods of A. coreaensis, the possibility of Archaeoniscus being ectoparasitic is discounted. Instead, the flattened body and the form of limbs of A. coreaensis would have been suitable for a benthic lifestyle.

Type
Research Article
Information
Journal of Paleontology , Volume 86 , Issue 4 , July 2012 , pp. 626 - 640
Copyright
Copyright © The Paleontological Society 

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