Molecular and karyological aspects of Batoidea (Chondrichthyes, Elasmobranchi) phylogeny

Rocco, Lucia; Liguori, I.; Costagliola, D.; Morescalchi, M. A.; Tinti, Fausto; Stingo, Vincenzo

doi:10.1016/j.gene.2006.09.024

Cited by 35 publications

(35 citation statements)

References 38 publications

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“…A large number of different interpretations exists in scienti�c literature based on morphological characters [3][4][5][6][7][8][9][10][11], on molecular studies [12][13][14], and on conventional cytogenetics [14,15]. Many scientists consider that batoids are monophyletic, even if the time of their divergence from the other elasmobranch �sh remains controversial.…”

Section: Phylogenetic Relationships Andmentioning

confidence: 99%

“…e progressive reduction of the diploid number, the increase of the number of chromosomes with two arms and the disappearance of microchromosomes occurred, probably as a consequence of polyploidy followed by diploidization and Robertsonian rearrangements ( Figure 1) [14,15,23,[25][26][27].…”

Section: Phylogenetic Relationships Andmentioning

confidence: 99%

“…ese molecular data were further discussed with karyological evidence coming from the literature [14].…”

Section: Phylogenetic Relationships Andmentioning

confidence: 99%

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Molecular and Chromosomal Markers for Evolutionary Considerations in Torpediniformes (Chondrichthyes, Batoidea)

Rocco

2013

ISRN Genetics

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Due to their basal position in the vertebrate phylogenetic tree, the study on elasmobranch genetics and cytogenetics can provide remarkable information on the mechanisms underlying the evolution of all vertebrates. In recent years, different molecular approaches have been used to study the relationships between the different taxonomic groups of cartilaginous �sh, among them are the physical mapping of speci�c nucleotide sequences on chromosomes. However, these are controversial, particularly in Torpediniformes in which the species have different karyological parameters. e purpose of this paper is to gather the molecular markers so far present in literature that were used to reconstruct the phylogenetic position of Torpediniformes with respect to the other Batoidea and to discriminate between the various chromosome pairs in the endemic species in the Mediterranean Sea, Torpedo torpedo, T. marmorata and T. nobiliana. e 5S and 18S ribosomal DNA, the HpaI and Alu SINE, the telomeric (TTAGGG)n and the spermatogenesis-related SPATA 16, SPATA 18, and UTY sequences were particularly useful. ese last genomic segments were also able to differentiate between the male and the female karyotypes. Moreover, the torpedoes showed a particular genomic organization, especially Torpedo torpedo, in which large quantities of highly repeated DNA and a characteristic distribution of heterochromatin, which is never centromeric, were observed.

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Section: Phylogenetic Relationships Andmentioning

confidence: 99%

Section: Phylogenetic Relationships Andmentioning

confidence: 99%

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Molecular and Chromosomal Markers for Evolutionary Considerations in Torpediniformes (Chondrichthyes, Batoidea)

Rocco

2013

ISRN Genetics

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“…Both morphological and molecular studies agree that torpediniforms represent a sister group to all other batoids (McEachran et al 1996;Rocco et al 2007), but there is currently no consensus on the position of pristids, since analyses have been based on different morphological characters and have yielded different relationships (McEachran et al 1996). Compagno (1977) places pristiforms as a sister group to rajiforms and mylobatiforms, whereas Nishida (1990) and Maisey (1984) place pristiforms as a sister group to all other batoids.…”

Section: Phylogeny Of Saw-bearing Batoids (Pristidae and Sclerorhynchmentioning

confidence: 99%

The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae)

Wueringer

Squire

Collin

2009

Rev Fish Biol Fisheries

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Sclerorhynchids (extinct sawfishes, Batoidea), pristids (extant sawfish, Batoidea) and pristiophorids (sawsharks, Squalomorphi) are the three elasmobranch families that possess an elongated rostrum with lateral teeth. Sclerorhynchids are the extinct sawfishes of the Cretaceous period, which reached maximum total lengths of 100 cm. The morphology of their rostral teeth is highly variable. Pristid sawfish occur circumtropically and can reach maximum total lengths of around 700 cm. All pristid species are globally endangered due to their restricted habitat inshore. Pristiophorid sawsharks are small sharks of maximum total lengths below 150 cm, which occur in depths of 70-900 m. Close examination of the morphology of pectoral fin basals and the internal structure of the rostrum reveals that sclerorhynchids and pristids evolved independently from rhinobatids, whereas pristiophorids are squalomorph sharks. The elongation of the rostrum may be an adaptation for feeding, as all marine vertebrate taxa that possess this structure are said to use it in the context of feeding.

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“…7. Phylogenetic tree according to genus [collated from trees provided by Schluessel et al, 2008;Rocco et al, 2007;Simon Pierce, Gavin Naylor, and Neil Aschliman (pers. comm.…”

Section: Functional Considerationsmentioning

confidence: 99%

A comparison of the external morphology of the membranous inner ear in elasmobranchs

Evangelista

Mills

Siebeck

et al. 2010

Journal of Morphology

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Studies on the elasmobranch inner ear have focused predominantly on a small group of sharks, particularly, carcharhinids. As a result, subsequent studies in other species have subdivided species into two main groups: those typical and those atypical of carcharhinid sharks. This study proposes a different set of inner-ear morphology groupings to those previously suggested. The inner ears from 17 species of elasmobranchs (representing both sharks and rays) are examined in this study and based on morphometric data some groups include both rays and sharks. Four groups are now proposed based predominantly on the shape and dimensions of the membranous otoconial organs, and characteristics of the semicircular canals. Evident morphological differences between the ear types belonging to the new groups include the membranes of the semicircular canals being bound to the otoconial organs in some species, while only being connected via the canal ducts in others, as well as clear variation present in saccular organ size. Previous studies examining variation in the inner ear have attributed differences to either phylogeny or functional significance. Results from this study suggest that neither phylogeny nor feeding strategy solely accounts for the morphological diversity present in the external morphology of the elasmobranch inner ear.

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Molecular and karyological aspects of Batoidea (Chondrichthyes, Elasmobranchi) phylogeny

Cited by 35 publications

References 38 publications

Molecular and Chromosomal Markers for Evolutionary Considerations in Torpediniformes (Chondrichthyes, Batoidea)

Molecular and Chromosomal Markers for Evolutionary Considerations in Torpediniformes (Chondrichthyes, Batoidea)

The biology of extinct and extant sawfish (Batoidea: Sclerorhynchidae and Pristidae)

A comparison of the external morphology of the membranous inner ear in elasmobranchs

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