Five Species of Callistocythere(ostracoda) From the Inland Sea of Seto

Okubo, Ichiro

doi:10.18353/rcustacea.9.0_13

Cited by 11 publications

(5 citation statements)

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“…The carapace morphology of this species occupies an intermediate taxonomic position between two genera, Callistocythere and Leptocythere; the female and male forms resemble the former and latter genera, respectively [43]. Due to these morphological differences between males and females, they were originally described as a different species [45] [46]. However, those two forms have recently been considered to represent males and females of a single species, Callistocythere pumila, based on the detailed description of soft parts [43].…”

Section: Carapace Surface Ornamentationmentioning

confidence: 99%

The History of Sexual Dimorphism in Ostracoda (Arthropoda, Crustacea) Since the Palaeozoic

Ozawa¹

2013

Sexual Dimorphism

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Section: Carapace Surface Ornamentationmentioning

confidence: 99%

The History of Sexual Dimorphism in Ostracoda (Arthropoda, Crustacea) Since the Palaeozoic

Ozawa¹

2013

Sexual Dimorphism

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“…7 ({); E -X. magutiensis (}); F -X. kamiya ({); G -X. vietnamensis ({); H -X. ikeya ({); I -X. planuventer ({); J -X. ryukyuensis ({); K -X. sesokoensis ({); L -X. setouchiensis ({); M -X. Kuroshio ({); N -X. magnoculus ({); O -X. notoensis ({); P -X. sagamiensis ({); Q -X. munensis ({). Note: E, F, aft er Hirosaki (2013); L, aft er Okubo (1979); O, P, aft er Sato & Kamiya (2007). Scale 100 μm.…”

Section: Discussionunclassified

Added Morphological Characteristics of Muscle Scars, Maxillula and Mandible of Two Ostracod Genera Loxoconcha (Loxoconchidae) and Xestoleberis (Xestoleberididae)

Le¹

2023

zoodiversity

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Total 23 species of the genus Loxoconcha and 21 species of the genus Xestoleberis were presented in this study. The results show that most species of the genus Loxoconcha consist of four adductor scars to arrange in a curved sub-vertical row and concave anteriorly, except L. pulchra carrying five, in which the top one is divided into two. The frontal scars with C-shape, opening anteriorly are presented in most of Loxoconcha species, however, the frontal scar with bean-shape or oval-shape is discovered in five species of L. japonica group. Most of L. kosugii bear the frontal scar with C-shape, but the frontal scar with Y-shape is found in several individuals. This phenemenon shows the close phylogeny between the genus Loxoconcha and Palmoconcha. About the genus Xestoleberis, chaetotaxy of setae on most appendages is a typical character of this genus, except for setae of exopodite on the maxillula. The published fossil records and the tendencies of change in the number of setae on the maxillula and mandible among three phylogenetic groups suggest that Group A or B is an ancestor of the genus Xestoleberis, and Group C is a derived group.

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“…Exterior Lophodont Keijia cf. demissa (Brady, 1868) Interior-interior-interior Pentodont Paradoxostoma triangulum Kajiyama, 1913 Exterior Lohodont Hemicytherura kajiyamai Hanai, 1957b Intermediate Hanai , 1957b Intermediate Yamada et al 2005 Intermediate Yajima, 1982 Intermediate-basic-intermediate Merodont Loxoconcha pulchra Ishizaki, 1968 Interior-intermediate-interior Gongylodont Loxoconcha japonica Ishizaki, 1968 Interior-intermediate-interior Gongylodont Callistocythere pumila Hanai, 1957a Interior-exterior-intermediate Entomodont Callistocythere rugosa Hanai, 1957a Interior-exterior-intermediate Entomodont Callistocythere setouchiensis Okubo, 1979 Interior-exterior-intermediate Entomodont Ishizakiella miurensis (Hanai, 1957a) Interior-basic-intermediate Entomodont Xestoleberis hanaii Ishizaki, 1968 Intermediate…”

Section: Darwinula Stevensoni: Basic Type (Figs 2d 3e) Vestalenula Cmentioning

confidence: 99%

Structure and evolution of podocopan ostracod hinges

Yamada

2007

Biological Journal of the Linnean Society

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A new concept of the hinge classification in the Podocopa is established based on a comprehensive description of the hinge ultrastructure. Four new types of structure are defined, according to the relative position of their ligaments and hingements (teeth elements): basic type, exterior type, intermediate type and interior type. The new classification reveals that the adont hinge, which is known as a simple structure, shares the fundamental structure (basic or exterior type) found in the Platycopida, Darwinuloidea and Bairdioidea, and that it develops not only as the fundamental structure, but also as the advanced structure (interior type) in the Cypridoidea and Cytheroidea. Additionally, the high level of morphological diversification of cytheroid hingements is explained in terms of the structural plasticity of the intermediate and interior hinge structure types. Most cytheroid hinges can develop complex arrangements of teeth (hingements) by only small changes of calcification because their hingements can develop independently from the particular restricted location of the ligaments. The evolutionary pathway of hinge structures is also examined based on a study of fossil records. The pathway indicates that the complex hinge structures of the derived taxa arose from simpler ones, but that sometimes this trend can be reversed and derived taxa can evolve simple hinge structures as adaptations to new habitats.

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Five Species of Callistocythere(ostracoda) From the Inland Sea of Seto

Cited by 11 publications

References 0 publications

The History of Sexual Dimorphism in Ostracoda (Arthropoda, Crustacea) Since the Palaeozoic

The History of Sexual Dimorphism in Ostracoda (Arthropoda, Crustacea) Since the Palaeozoic

Added Morphological Characteristics of Muscle Scars, Maxillula and Mandible of Two Ostracod Genera Loxoconcha (Loxoconchidae) and Xestoleberis (Xestoleberididae)

Structure and evolution of podocopan ostracod hinges

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