Preliminary Study on the Ecology of Ostracods from the Moat of a Coral Reef off Sesoko Island, Okinawa, Japan

Tabuki, Ryoichi; Nohara, Tomohide

doi:10.1016/s0920-5446(08)70199-7

Cited by 9 publications

(2 citation statements)

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“…Recent specimens of this species have been found in several localities besides Uranouchi Bay: Aomori Bay (Ishizaki 1971), Tateyama Bay (Frydl 1982), Aburatsubo (Kamiya 1988a), Hamana-ko Bay (Ikeya and Hanai 1982), Na-kanoumi (Ishizaki 1969), Inland Sea (Okubo 1980), Sekisei-sho (Tabuki et al 1987), and Sesoko (Tabuki and Nohara 1988). Fossil spec imens have been found in Holocene Numa Formation (Frydl 1982), Pleistocene Kioroshi and Kiyokawa Formations (Yajima 1978), Pleistocene Nakoshi Sand, Chinen Sand, Naha Limestone, Pliocene Shinzato Formation, and Miocene Yonabaru Formation (Nohara 1987).…”

Section: Methodsmentioning

confidence: 99%

Heterochronic Dimorphism of Loxoconcha Uranouchiensis (Ostracoda) and its Implication for Speciation

Kamiya

1992

Paleobiology

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Polymorphism is being actively investigated by ostracode specialists because the phenomenon is widespread and may be a key to understanding speciation patterns and evolutionary processes. However, the methods for recognizing the phenomenon and the cause or causes of polymorphism are still under debate. This study presents an example of genetically controlled ostracode dimorphism in which the relationship between the two forms can be explained in terms of heterochrony. The living males as well as the females of Loxoconcha uranouchiensis in Aburatsubo Cove, central Japan, are found to be dimorphic in size, shape, and surface ornamentation of the carapace. The dimorphic forms appear concurrently in the same microhabitat, suggesting that the dimorphism is genetically rather than environmentally controlled. Although the large and the small forms are indistinguishable in their early stages, morphological differences gradually appear and become complete after the final molting, which is the seventh molting for both forms. The characters determined by the number of moltings, such as the numbers of reticules, bristles, and pores, are identical between adults of the two forms. In contrast, for characters affected by the growth condition of the epidermal-cell system, such as carapace shape and fine surface ornamentation, the small-form adult is similar to the penultimate instar of the large form. Taking the large form as a standard, the small form is paedomorphic. These two forms are reproductively isolated and should be considered different species.

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Section: Methodsmentioning

confidence: 99%

Heterochronic Dimorphism of Loxoconcha Uranouchiensis (Ostracoda) and its Implication for Speciation

Kamiya

1992

Paleobiology

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“…They showed the structure of species composition for each traverse and each location. Tabuki & Nohara (1988) studied the ecology of intertidal and subtidal ostracods living in the moat of a coral reef off Sesoko Island, and their preliminary results on the species composition of ostracods and its seasonal changes were discussed.…”

Section: Introductionmentioning

confidence: 99%

Three new species of the genus Loxoconcha (Crustacea, Ostracoda, Podocopida) from the Okinawa Islands, southern Japan

Dung

Tsukagoshi

2014

Zootaxa

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Three new species of Ostracoda, Loxoconcha noharai sp. nov., L. santosi sp. nov. and L. sesokoensis sp. nov., are described from the Okinawa Islands, southern Japan. The two species Loxoconcha noharai sp. nov. and L. santosi sp. nov. live in estuaries, whereas the species L. sesokoensis sp. nov. lives in coral reefs. These species can be easily distinguished from other previously described Loxoconcha species by their morphological differences, mainly in the male copulatory organ, and distribution pattern of their pore systems. In addition, L. sesokoensis sp. nov. is suggested to be phylogenetically apart from any other Loxoconcha species which have been reported so far from Japan and the adjacent seas.

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The Ostracoda of the Sekisei-sho area, Ryukyu Islands, Japan: a preliminary report on ostracods from coral reefs in the Ryukyu Islands

Tabuki¹

1990

Ostracoda and Global Events

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Preliminary Study on the Ecology of Ostracods from the Moat of a Coral Reef off Sesoko Island, Okinawa, Japan

Cited by 9 publications

References 1 publication

Heterochronic Dimorphism of Loxoconcha Uranouchiensis (Ostracoda) and its Implication for Speciation

Heterochronic Dimorphism of Loxoconcha Uranouchiensis (Ostracoda) and its Implication for Speciation

Three new species of the genus Loxoconcha (Crustacea, Ostracoda, Podocopida) from the Okinawa Islands, southern Japan

The Ostracoda of the Sekisei-sho area, Ryukyu Islands, Japan: a preliminary report on ostracods from coral reefs in the Ryukyu Islands

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