Sexual dimorphism in scales of marbled flounder <i>Pseudopleuronectes yokohamae</i> (Pleuronectiformes: Pleuronectidae), with comments on the relevance to their spawning behaviour

Tomiyama, Takeshi

doi:10.1111/jfb.12232

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…The ossicles of cottiforms, syngnathiforms, and gasterosteiforms have been characterized and differences in scale modifications of female and male specimens of the shorthorn sculpin documented in Märss et al (2010a, b) and Lees et al (2012). Variations in scales between sexes of different flatfishes have been documented by Norman (1934) and Tomiyama (2013). Batts (1964) ascertained the main morphological scale characteristics to distinguish the 15 species of flatfishes of Puget Sound, Washington.…”

Section: Introductionmentioning

confidence: 99%

A comparative SEM study of ossicles in the Pleuronectiformes (Teleostei) of the Baltic Sea

Märss

Wilson²,

Lees³

et al. 2015

Proc. Estonian Acad. Sci.

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The morphologies of ossicles of the European plaice Pleuronectes platessa Linnaeus, the European flounder Platichthys flesus trachurus (Linnaeus) (Pleuronectidae), and the turbot Scophthalmus maximus (Linnaeus) (Scophthalmidae) are described and compared. The examined material of these flatfishes (Pleuronectiformes) originates from Estonian waters, the eastern Baltic Sea. The cycloid and ctenoid scales, tubercles, lateral line scales and segments, and swivel-joint platelets noticeably differ among the three studied species. Because of characteristics of ctenii and development of the ctenial pattern, the scales of the flounder have been separated into a new subtype, the overgrowing ctenoid scales belonging to a general type of ctenoid scales. Two different appearances of tubercles, ctenoid and circuloid, are described for the flounder and turbot, respectively. Although the ossicles of the European plaice and European flounder differ in many details, they are not as highly modified as are the circuloid tubercles of the turbot. In the European plaice, a strong difference also occurs between the scales of males and females. In the European flounder and turbot, nodular ultrasculpture on the external surface of ossicles and structure formed by Mandl's corpuscles on their internal surface, known to be caused by mineralization processes, are imaged under scanning electron microscope and also described.

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Section: Introductionmentioning

confidence: 99%

A comparative SEM study of ossicles in the Pleuronectiformes (Teleostei) of the Baltic Sea

Märss

Wilson²,

Lees³

et al. 2015

Proc. Estonian Acad. Sci.

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“…This sexual dimorphism in external morphology often poses challenges in species identification. Moreover, this characteristic complexity in external appearance frequently hinders precise species differentiation among flatfishes [12].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Mitochondrial Genetic Makeup and Miocene Colonization of Primitive Flatfishes (Pleuronectiformes: Psettodidae) in the East Atlantic and Indo-West Pacific Ocean

Kundu,

Palimirmo,

Kang

et al. 2023

Biology

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The mitogenomic evolution of the Psettodes flatfishes is still poorly known from their range distribution in eastern Atlantic and Indo-West Pacific Oceans. The study delves into the matrilineal evolutionary pathway of these primitive flatfishes, with a specific focus on the complete mitogenome of the Psettodes belcheri species, as determined through next-generation sequencing. The mitogenome in question spans a length of 16,747 base pairs and comprises a total of 37 genes, including 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and a control region. Notably, the mitogenome of P. belcheri exhibits a bias towards AT base pairs, with a composition of 54.15%, mirroring a similar bias observed in its close relative, Psettodes erumei, which showcases percentages of 53.07% and 53.61%. Most of the protein-coding genes commence with an ATG initiation codon, except for Cytochrome c oxidase I (COI), which initiates with a GTG codon. Additionally, four protein-coding genes commence with a TAA termination codon, while seven others exhibit incomplete termination codons. Furthermore, two protein-coding genes, namely NAD1 and NAD6, terminate with AGG and TAG stop codons, respectively. In the mitogenome of P. belcheri, the majority of transfer RNAs demonstrate the classical cloverleaf secondary structures, except for tRNA-serine, which lacks a DHU stem. Comparative analysis of conserved blocks within the control regions of two Psettodidae species unveiled that the CSB-II block extended to a length of 51 base pairs, surpassing the other blocks and encompassing highly variable sites. A comprehensive phylogenetic analysis using mitochondrial genomes (13 concatenated PCGs) categorized various Pleuronectiformes species, highlighting the basal position of the Psettodidae family and showed monophyletic clustering of Psettodes species. The approximate divergence time (35−10 MYA) between P. belcheri and P. erumei was estimated, providing insights into their separation and colonization during the early Miocene. The TimeTree analysis also estimated the divergence of two suborders, Psettodoidei and Pleuronectoidei, during the late Paleocene to early Eocene (56.87 MYA). The distribution patterns of Psettodes flatfishes were influenced by ocean currents and environmental conditions, contributing to their ecological speciation. In the face of climate change and anthropogenic activities, the conservation implications of Psettodes flatfishes are emphasized, underscoring the need for regulated harvesting and adaptive management strategies to ensure their survival in changing marine ecosystems. Overall, this study contributes to understanding the evolutionary history, genetic diversity, and conservation needs of Psettodes flatfishes globally. However, the multifaceted exploration of mitogenome and larger-scale genomic data of Psettodes flatfish will provide invaluable insights into their genetic characterization, evolutionary history, environmental adaptation, and conservation in the eastern Atlantic and Indo-West Pacific Oceans.

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“…The scale types can also change even in a single individual during its life span (Able & Lamonaca, 2006; Norman, 1934; Roberts, 1993). The scale type and morphology also vary during the fish development, and also it depends on the fish size and sexes (Tomiyama, 2013).…”

Section: Introductionmentioning

confidence: 99%

Scale morphological variation across the flank in four Tonguefishes species collected from the Gulf of Oman (Pleuronectiforms; Cynoglossidae)

et al. 2022

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The scale morphology of pleuronectiforms in the Gulf of Oman remains insufficiently known. This study used light microscopy and morphological analysis to examine scale variation across the flank of four Tonguefishes species; Cynoglossus arel, C. bilineatus, C. lingua, and C. puncticeps. Scales were extracted from six flank regions, three on the eyed and blind sides, respectively. The most differentiated species was C. arel, which showed significant differences in four size variables in five regions. In Cynoglossus arel and C. lingua, the scales of the eyed side were ctenoid, and those scales from the blind side were cycloid; C. puncticeps have ctenoid scales on both flank sides and C. bilineatus has cycloid scales on both sides. All species' scales on the blind side have fewer ctenial spines (except in C. bilineatus). This study indicated that scale morphology demonstrated considerable variation among the flank regions of the examined species. As a result, the scales from the head and the trunk regions of the eyed side and the scales from the head region of the blind side have a good power of species separation in this family.

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Sexual dimorphism in scales of marbled flounder Pseudopleuronectes yokohamae (Pleuronectiformes: Pleuronectidae), with comments on the relevance to their spawning behaviour

Cited by 10 publications

References 15 publications

A comparative SEM study of ossicles in the Pleuronectiformes (Teleostei) of the Baltic Sea

A comparative SEM study of ossicles in the Pleuronectiformes (Teleostei) of the Baltic Sea

Insights into the Mitochondrial Genetic Makeup and Miocene Colonization of Primitive Flatfishes (Pleuronectiformes: Psettodidae) in the East Atlantic and Indo-West Pacific Ocean

Scale morphological variation across the flank in four Tonguefishes species collected from the Gulf of Oman (Pleuronectiforms; Cynoglossidae)

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