Dimorphism, parasitism, and sex revisited: modes of reproduction among deep-sea ceratioid anglerfishes (Teleostei: Lophiiformes)

Pietsch, Theodore W.

doi:10.1007/s10228-005-0286-2

Cited by 120 publications

(67 citation statements)

References 35 publications

(75 reference statements)

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“…Some of the most impressive cases of miniaturization occur in teleost fishes ( Weitzman & Vari 1988;Hanken & Wake 1993), which also include the smallest vertebrates maturing at sizes below 10 mm ( Winterbottom & Emery 1981;Watson & Walker 2004;Pietsch 2005;Kottelat et al 2006). Teleosts provide convincing examples for the claim that the evolution of extremely small size is frequently associated not only with reduction and structural simplification, but also with hyperossification, the evolution of morphological novelty and with increased morphological variability (Hanken & Wake 1993).…”

Section: Discussion (A) Miniaturization Developmental Truncation Andmentioning

confidence: 99%

Spectacular morphological novelty in a miniature cyprinid fish, Danionella dracula n. sp.

2009

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Danionella dracula is a new species of sexually dimorphic, miniature and highly developmentally truncated cyprinid fish. Compared with its close relative, the zebrafish Danio rerio , it lacks 44 bones or parts thereof and represents one of the most developmentally truncated vertebrates. Absence of the majority of bones appears to be due to developmental truncation via terminal deletion. In contrast to these larval-like features, D. dracula also shows several hyperossifications. Uniquely, among carp-like fishes, male D. dracula have a series of long, pointed odontoid processes on the jaws greatly resembling the jaw dentition of teleosts with true teeth. The anterior-most process in each jaw is extended as a canine-like fang projecting through the epithelium. True jaw teeth are absent from all 3700 species of cypriniforms and were lost at least in the Upper Eocene. It remains to be investigated, however, whether the conserved pathways to regulate tooth development in cypriniforms have been used in D. dracula to form and pattern the odontoid processes. This new species represents a remarkable example linking progenetic paedomorphosis via heterochronic change in developmental timing to the evolution of morphological novelties.

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Section: Discussion (A) Miniaturization Developmental Truncation Andmentioning

confidence: 99%

Spectacular morphological novelty in a miniature cyprinid fish, Danionella dracula n. sp.

2009

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“…Integration in the latter case is remarkable, granting these creatures a high degree of "organismality" (98). Another case of recursive multicellularity is in the anglerfish, which can also be regarded as the ultimate integration of the sexes, where even the circulatory systems of the female and the much smaller male(s) become one (99).…”

Section: The Origin Of Multicellularity: Fraternal and Egalitarianmentioning

confidence: 99%

Toward major evolutionary transitions theory 2.0

Szathmáry

2015

Proc. Natl. Acad. Sci. U.S.A.

325

343

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The impressive body of work on the major evolutionary transitions in the last 20 y calls for a reconstruction of the theory although a 2D account (evolution of informational systems and transitions in individuality) remains. Significant advances include the concept of fraternal and egalitarian transitions (lower-level units like and unlike, respectively). Multilevel selection, first without, then with, the collectives in focus is an important explanatory mechanism. Transitions are decomposed into phases of origin, maintenance, and transformation (i.e., further evolution) of the higher level units, which helps reduce the number of transitions in the revised list by two so that it is less top-heavy. After the transition, units show strong cooperation and very limited realized conflict. The origins of cells, the emergence of the genetic code and translation, the evolution of the eukaryotic cell, multicellularity, and the origin of human groups with language are reconsidered in some detail in the light of new data and considerations. Arguments are given why sex is not in the revised list as a separate transition. Some of the transitions can be recursive (e.g., plastids, multicellularity) or limited (transitions that share the usual features of major transitions without a massive phylogenetic impact, such as the microand macronuclei in ciliates). During transitions, new units of reproduction emerge, and establishment of such units requires high fidelity of reproduction (as opposed to mere replication).egalitarian transitions | fraternal transitions | multilevel selection | aggregative unit formation | recursive transitions T he book The Major Transitions in Evolution was published 20 y ago (1) and popularized 16 y ago (2). The impressive work accomplished by the interested community has made time ripe for a resynthesis of the field. In this paper, I outline the revised theory for transitions research while noting that the full account can be taken only in a new book. First, I present the key points of the theory, followed by an impressionist overview of some of the transitions, highlighting (without being all-inclusive) some of the most exciting findings pertinent to the major transitions in a revised list. In doing so, I rebuild some of the foundations of the theory. A scholarly account of all relevant contributions is beyond the scope of the present paper. For lack of space, I deliberately omit discussion on the origin of animal societies (3), except humans.

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“…Striking morphological differences between large unsightly females and minute parasitic males in anglerfish are one of many spectacular examples of such sexual dimorphism [1]. Sexual dimorphism manifests not only in morphological traits, but also in physiological and behavioural traits.…”

Section: Introductionmentioning

confidence: 99%

Sex differences in DNA methylation and expression in zebrafish brain: a test of an extended ‘male sex drive’ hypothesis

Chatterjee

Lagisz

Rodger

et al. 2016

Gene

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Sex differences in DNA methylation and expression in zebrafish brain: a test of an extended 'male sex drive ' hypothesis, Gene (2016' hypothesis, Gene ( ), doi: 10.1016' hypothesis, Gene ( /j.gene.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 3 ABSTRACTThe sex drive hypothesis predicts that stronger selection on male traits has resulted in masculinization of the genome. Here we test whether such masculinizing effects can be detected at the level of the transcriptome and methylome in the adult zebrafish brain.Although methylation is globally similar, we identified 914 specific differentially methylated CpGs (DMCs) between males and females (435 were hypermethylated and 479 were hypomethylated in males compared to females). These DMCs were prevalent in gene body, intergenic regions and CpG island shores. We also discovered 15 distinct CpG clusters with striking sex-specific DNA methylation differences. In contrast, at transcriptome level, more female-biased genes than male-biased genes were expressed, giving little support for the male sex drive hypothesis.Our study provides genome-wide methylome and transcriptome assessment and sheds light on sex-specific epigenetic patterns and in zebrafish for the first time.

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Dimorphism, parasitism, and sex revisited: modes of reproduction among deep-sea ceratioid anglerfishes (Teleostei: Lophiiformes)

Cited by 120 publications

References 35 publications

Spectacular morphological novelty in a miniature cyprinid fish, Danionella dracula n. sp.

Spectacular morphological novelty in a miniature cyprinid fish, Danionella dracula n. sp.

Toward major evolutionary transitions theory 2.0

Sex differences in DNA methylation and expression in zebrafish brain: a test of an extended ‘male sex drive’ hypothesis

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