Erratum to: Identification and chromosome mapping of repetitive elements in the Astyanax scabripinnis (Teleostei: Characidae) species complex

A new species of Astyanax from the upper rio Paraguaçu basin, Chapada Diamantina, Bahia, Brazil, is described. Astyanax sincora shares characters currently used to define the Astyanax scabripinnis species complex, as highest body depth approximately at vertical through pectoral-fin midlength and a low number of branched anal-fin rays (13–17). It differs from its congeners by a combination of characters, including eight branched dorsal-fin rays, six branched pelvic-fin rays, presence of bony hooks in pectoral and anal fins of males, dark midlateral line or stripe initiating posteriorly to the vertically elongate humeral blotch, and by the presence of 30–35 scales in the median longitudinal series. The generic positioning of the new species and some polymorphic morphological characters in Astyanax are briefly discussed. The degree of completeness of the lateral line in Hyphessobrycon balbus is discussed. [Species Zoobank registration: urn:lsid:zoobank.org:pub:D708FE7E-3FB5-4729-B438-779717F7ED1A]

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Physical chromosome mapping of repetitive DNA sequences in Nile tilapia Oreochromis niloticus: Evidences for a differential distribution of repetitive elements in the sex chromosomes

Micron ◽

10.1016/j.micron.2007.02.010 ◽

2008 ◽

Vol 39 (4) ◽

pp. 411-418 ◽

Cited By ~ 51

Author(s):

Irani A. Ferreira ◽

Cesar Martins

Keyword(s):

Repetitive Dna ◽

Sex Chromosomes ◽

Dna Sequences ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Chromosome Mapping ◽

Repetitive Elements ◽

Repetitive Dna Sequences ◽

Differential Distribution ◽

Nile Tilapia Oreochromis Niloticus

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Cytogenetic Diversity in the Astyanax scabripinnis Species Complex (Pisces, Characidae) I. Allopatric distribution in a small stream.

CYTOLOGIA ◽

10.1508/cytologia.60.1 ◽

1995 ◽

Vol 60 (1) ◽

pp. 1-11 ◽

Cited By ~ 33

Author(s):

I. L. Souza ◽

O. Moreira-Filho

Keyword(s):

Species Complex ◽

Small Stream ◽

Astyanax Scabripinnis ◽

Allopatric Distribution

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Two new species of Astyanax Baird & Girard (Characiformes: Characidae) from the upper rio Paraguaçu basin, Chapada Diamantina, Bahia, Brazil

Zootaxa ◽

10.11646/zootaxa.4438.3.3 ◽

2018 ◽

Vol 4438 (3) ◽

pp. 471 ◽

Cited By ~ 6

Author(s):

ANGELA M. ZANATA ◽

RAFAEL BURGER ◽

PRISCILA CAMELIER

Keyword(s):

Species Complex ◽

Ventral Margin ◽

Broad Area ◽

Caudal Peduncle ◽

Body Depth ◽

Chapada Diamantina ◽

The Third ◽

Astyanax Scabripinnis ◽

Two New Species ◽

Fin Rays

Astyanax lorien and A. rupestris are described from tributaries of upper rio Paraguaçu basin, Bahia, Brazil. Both species shares the majority of the characters currently used to define the Astyanax scabripinnis species complex, with highest body depth approximately at vertical through pectoral-fin midlength and a low number of branched anal-fin rays (15–21). Astyanax lorien is distinguished from its congeners by a combination of characters, including presence of small bony hooks on all fins of mature males, a unique vertically elongate humeral blotch, and ventral margin of the third infraorbital close to the horizontal limb of preopercle. Astyanax rupestris is distinguished from its congeners also by a combination of characters, including ventral margin of third infraorbital distinctly separated from horizontal limb of preopercle, leaving a broad area without superficial bones, absence of midlateral stripe on body, absence of blotch on caudal peduncle, and presence of a vertically elongated conspicuous dark humeral blotch, not bordered anteriorly and posteriorly by distinct unpigmented areas. Both species are apparently endemic to the upper portion of the Paraguaçu river basin, within the Chapada Diamantina domain.

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Comparative chromosome mapping of 5S rDNA and 5SHindIII repetitive sequences in Erythrinidae fishes (Characiformes) with emphasis on the Hoplias malabaricus ‘species complex’

Cytogenetic and Genome Research ◽

10.1159/000106445 ◽

2007 ◽

Vol 118 (1) ◽

pp. 78-83 ◽

Cited By ~ 19

Author(s):

I.A. Ferreira ◽

L.A.C. Bertollo ◽

C. Martins

Keyword(s):

Species Complex ◽

Repetitive Sequences ◽

5S Rdna ◽

Chromosome Mapping ◽

Hoplias Malabaricus

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Two new species of Astyanax (Ostariophysi: Characiformes: Characidae) from eastern Brazil, with a synopsis of the Astyanax scabripinnis species complex

Neotropical Ichthyology ◽

10.1590/s1679-62252006000100004 ◽

2006 ◽

Vol 4 (1) ◽

pp. 53-60 ◽

Cited By ~ 59

Author(s):

Vinicius A. Bertaco ◽

Carlos A. S. de Lucena

Keyword(s):

New Species ◽

Lateral Line ◽

Standard Length ◽

Species Complex ◽

Body Depth ◽

Astyanax Scabripinnis ◽

Interorbital Width ◽

Eastern Brazil ◽

Two New Species ◽

Fin Rays

Two new species of Astyanax are described from eastern Brazil: A . microschemos from the córrego Palmital, rio Itapemirim drainage, Espírito Santo, and A . pelecus from the rio Pardo drainage, Bahia. Astyanax microschemos differs from its congeners by its shallower body depth, 26.9-29.7% of standard length, the presence of one vertically elongate humeral spot that extend above and below the lateral line, smaller interorbital width, 26.9-30.4% of head length, and the possession of 14-18 branched anal-fin rays. Astyanax pelecus differs from its congeners in the possession of only one humeral spot limited to the region dorsal to the lateral line, conspicuous, dark, midlateral body stripe extending from the upper margin of the opercle to the caudal-fin base, a shallower body depth, 26.7-34.8% of standard length, and the possession of 16-18 branched anal-fin rays, 38-39 scales in the lateral-line series, and four scales between the lateral line and the pelvic-fin origin. Astyanax microschemos has a massive head, short snout, usually smaller than the orbital diameter, shallow body depth, and vertically-elongate humeral spot that serve to include it in the A . scabripinnis species complex. A comparative synopsis of this complex is provided.

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Small, but surprisingly repetitive genomes: Transposon expansion and not polyploidy has driven a doubling in genome size in a metazoan species complex

10.21203/rs.2.9135/v3 ◽

2019 ◽

Author(s):

Julie Blommaert ◽

Simone Riss ◽

Bette Hecox-Lea ◽

David B. Mark-Welch ◽

Claus-Peter Stelzer

Keyword(s):

Genome Size ◽

Species Complex ◽

Nuclear Dna ◽

Repetitive Element ◽

Size Variation ◽

Nuclear Dna Content ◽

Repetitive Elements ◽

Element Content ◽

Genome Size Variation ◽

Closely Related Species

Abstract Background: The causes and consequences of genome size variation across Eukaryotes, which spans five orders of magnitude, have been hotly debated since before the advent of genome sequencing. Previous studies have mostly examined variation among larger taxonomic units (e.g., orders, or genera), while comparisons among closely related species are rare. Rotifers of the Brachionus plicatilis species complex exhibit a seven-fold variation in genome size and thus represent a unique opportunity to study such changes on a relatively short evolutionary timescale. Here, we sequenced and analysed the genomes of four species of this complex with nuclear DNA contents spanning 110- 422 Mbp. To establish the likely mechanisms of genome size change, we analysed both sequencing read libraries and assemblies for signatures of polyploidy and repetitive element content. We also compared these genomes to that of B. calyciflorus, the closest relative with a sequenced genome (293 Mbp nuclear DNA content). Results summary: Despite the very large differences in genome size, we saw no evidence of ploidy level changes across the B. plicatilis complex. However, repetitive element content explained a large portion of genome size variation (at least 54%). The species with the largest genome, B. asplanchnoidis, has a strikingly high 44% repetitive element content, while the smaller B. plicatilis genomes contain between 14% and 25% repetitive elements. According to our analyses, the B. calyciflorus genome contains 39% repetitive elements, which is substantially higher than previously reported (21%), and suggests that high repetitive element load could be widespread in monogonont rotifers. Conclusions: Even though the genome sizes of these species are at the low end of the Metazoan spectrum, their genomes contain substantial amounts of repetitive elements. Polyploidy does not appear to play a role in genome size variations in these species, and these variations can be mostly explained by changes in repetitive element content. This contradicts the naïve expectation that small genomes are streamlined, or less complex, and that large variations in nuclear DNA content between closely related species are due to polyploidy.

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Small, but surprisingly repetitive genomes: Transposon expansion and not polyploidy has driven a doubling in genome size in a metazoan species complex

10.21203/rs.2.9135/v2 ◽

2019 ◽

Author(s):

Julie Blommaert ◽

Simone Riss ◽

Bette Hecox-Lea ◽

David B. Mark-Welch ◽

Claus-Peter Stelzer

Keyword(s):

Genome Size ◽

Species Complex ◽

Nuclear Dna ◽

Repetitive Element ◽

Size Variation ◽

Nuclear Dna Content ◽

Repetitive Elements ◽

Element Content ◽

Genome Size Variation ◽

Closely Related Species

Abstract Background: The causes and consequences of genome size variation across Eukaryotes, which spans five orders of magnitude, have been hotly debated since before the advent of genome sequencing. Previous studies have mostly examined variation among larger taxonomic units (e.g., orders, or genera), while comparisons among closely related species are rare. Rotifers of the Brachionus plicatilis species complex exhibit a seven-fold variation in genome size and thus represent a unique opportunity to study such changes on a relatively short evolutionary timescale. Here, we sequenced and analysed the genomes of four species of this complex with nuclear DNA contents spanning 110- 422 Mbp. To establish the likely mechanisms of genome size change, we analysed both sequencing read libraries and assemblies for signatures of polyploidy and repetitive element content. We also compared these genomes to that of B. calyciflorus, the closest relative with a sequenced genome (293 Mbp nuclear DNA content). Results summary: Despite the very large differences in genome size, we saw no evidence of ploidy level changes across the B. plicatilis complex. However, repetitive element content explained a large portion of genome size variation (at least 54%). The species with the largest genome, B. asplanchnoidis, has a strikingly high 44% repetitive element content, while the smaller B. plicatilis genomes contain between 14% and 25% repetitive elements. According to our analyses, the B. calyciflorus genome contains 39% repetitive elements, which is substantially higher than previously reported (21%), and suggests that high repetitive element load could be widespread in monogonont rotifers. Conclusions: Even though the genome sizes of these species are at the low end of the Metazoan spectrum, their genomes contain substantial amounts of repetitive elements. Polyploidy does not appear to play a role in genome size variations in these species, and these variations can be mostly explained by changes in repetitive element content. This contradicts the naïve expectation that small genomes are streamlined, or less complex, and that large variations in nuclear DNA content between closely related species are due to polyploidy.

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