scholarly journals The Cerebellum and Cerebellum-Like Structures of Cartilaginous Fishes

2012 ◽  
Vol 80 (2) ◽  
pp. 152-165 ◽  
Author(s):  
John C. Montgomery ◽  
David Bodznick ◽  
Kara E. Yopak
Keyword(s):  
Cartilaginous Fishes

scholarly journals The Independent Evolution of Dorsal Pallia in Multiple Vertebrate Lineages

2021 ◽  
pp. 1-12
Author(s):  
Georg F. Striedter ◽  
R. Glenn Northcutt
Keyword(s):  
Olfactory Bulbs ◽  
Sensory Inputs ◽  
Independent Evolution ◽  
Sensory Modalities ◽  
Olfactory Input ◽  
Cartilaginous Fishes

Comparative neurobiologists have long wondered when and how the dorsal pallium (e.g., mammalian neocortex) evolved. For the last 50 years, the most widely accepted answer has been that this structure was already present in the earliest vertebrates and, therefore, homologous between the major vertebrate lineages. One challenge for this hypothesis is that the olfactory bulbs project throughout most of the pallium in the most basal vertebrate lineages (notably lampreys, hagfishes, and lungfishes) but do not project to the putative dorsal pallia in teleosts, cartilaginous fishes, and amniotes (i.e., reptiles, birds, and mammals). To make sense of these data, one may hypothesize that a dorsal pallium existed in the earliest vertebrates and received extensive olfactory input, which was subsequently lost in several lineages. However, the dorsal pallium is notoriously difficult to delineate in many vertebrates, and its homology between the various lineages is often based on little more than its topology. Therefore, we suspect that dorsal pallia evolved independently in teleosts, cartilaginous fishes, and amniotes. We further hypothesize that the emergence of these dorsal pallia was accompanied by the phylogenetic restriction of olfactory projections to the pallium and the expansion of inputs from other sensory modalities. We do not deny that the earliest vertebrates may have possessed nonolfactory sensory inputs to some parts of the pallium, but such projections alone do not define a dorsal pallium.

scholarly journals On the male organs of some of the cartilaginous fishes

1843 ◽  
Vol 4 ◽  
pp. 129-129
Keyword(s):  
Cartilaginous Fishes

In this paper, which is wholly occupied with anatomical details, the author refers to his paper on the Torpedo, which was published in the Philosophical Transactions for 1834; and also to Müller’s work “De Glandularum secernentium structura penitiori,” whose descriptions and views are not in accordance with those given in that paper. In the present memoir he adduces evidence of the accuracy of his former statement, chiefly founded on microscopical observations, and offers some conjectures respecting the functions of several organs found in cartilaginous fishes; but does not pretend to attach undue importance to his speculations.

scholarly journals Evolutionary Relations of Hexanchiformes Deep-Sea Sharks Elucidated by Whole Mitochondrial Genome Sequences

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Keiko Tanaka ◽  
Takashi Shiina ◽  
Taketeru Tomita ◽  
Shingo Suzuki ◽  
Kazuyoshi Hosomichi ◽  
...  
Keyword(s):  
Genetic Relationships ◽  
Close Relation ◽  
Rrna Genes ◽  
Gill Slit ◽  
Mtdna Sequences ◽  
Protein Coding ◽  
Bayesian Phylogenetic Analysis ◽  
Extant Species ◽  
Complete Mitogenome ◽  
Cartilaginous Fishes

Hexanchiformes is regarded as a monophyletic taxon, but the morphological and genetic relationships between the five extant species within the order are still uncertain. In this study, we determined the whole mitochondrial DNA (mtDNA) sequences of seven sharks including representatives of the five Hexanchiformes, one squaliform, and one carcharhiniform and inferred the phylogenetic relationships among those species and 12 other Chondrichthyes (cartilaginous fishes) species for which the complete mitogenome is available. The monophyly of Hexanchiformes and its close relation with all other Squaliformes sharks were strongly supported by likelihood and Bayesian phylogenetic analysis of 13,749 aligned nucleotides of 13 protein coding genes and two rRNA genes that were derived from the whole mDNA sequences of the 19 species. The phylogeny suggested that Hexanchiformes is in the superorder Squalomorphi,Chlamydoselachus anguineus(frilled shark) is the sister species to all other Hexanchiformes, and the relations within Hexanchiformes are well resolved asChlamydoselachus, (Notorynchus, (Heptranchias, (Hexanchus griseus,H. nakamurai))). Based on our phylogeny, we discussed evolutionary scenarios of the jaw suspension mechanism and gill slit numbers that are significant features in the sharks.

Q/R RNA editing of the AMPA receptor subunit 2 (GRIA2) transcript evolves no later than the appearance of cartilaginous fishes

FEBS Letters ◽  
2001 ◽  
Vol 509 (2) ◽  
pp. 277-281 ◽  
Author(s):  
Shieh-Shiuh Kung ◽  
Yu-Chia Chen ◽  
Wei-Hsiang Lin ◽  
Chun-Chen Chen ◽  
Wei-Yuan Chow
Keyword(s):  
Rna Editing ◽  
Ampa Receptor ◽  
Receptor Subunit ◽  
Ampa Receptor Subunit ◽  
Cartilaginous Fishes

Diversity and Evolution of Mineralized Skeletal Tissues in Chondrichthyans

2021 ◽  
Vol 9 ◽  
Author(s):  
Fidji Berio ◽  
Morgane Broyon ◽  
Sébastien Enault ◽  
Nelly Pirot ◽  
Faviel A. López-Romero ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Phylogenetic Relationships ◽  
Current Knowledge ◽  
Neural Arch ◽  
Fossil Species ◽  
Fibrous Matrix ◽  
Cartilaginous Matrix ◽  
Mineralized Tissues ◽  
Early Vertebrates ◽  
Cartilaginous Fishes

The diversity of skeletal tissues in extant vertebrates includes mineralized and unmineralized structures made of bone, cartilage, or tissues of intermediate nature. This variability, together with the diverse nature of skeletal tissues in fossil species question the origin of skeletonization in early vertebrates. In particular, the study of skeletal tissues in cartilaginous fishes is currently mostly restrained to tessellated cartilage, a derived form of mineralized cartilage that evolved at the origin of this group. In this work, we describe the architectural and histological diversity of neural arch mineralization in cartilaginous fishes. The observed variations in the architecture include tessellated cartilage, with or without more massive sites of mineralization, and continuously mineralized neural arches devoid of tesserae. The histology of these various architectures always includes globular mineralization that takes place in the cartilaginous matrix. In many instances, the mineralized structures also include a fibrous component that seems to emerge from the perichondrium and they may display intermediate features, ranging from partly cartilaginous to mostly fibrous matrix, similar to fibrocartilage. Among these perichondrial mineralized tissues is also found, in few species, a lamellar arrangement of the mineralized extracellular matrix. The evolution of the mineralized tissues in cartilaginous fishes is discussed in light of current knowledge of their phylogenetic relationships.

scholarly journals Visual Pigments of Three Species of Cartilaginous Fishes

Nature ◽  
1969 ◽  
Vol 222 (5190) ◽  
pp. 285-285 ◽  
Author(s):  
D. D. BEATTY
Keyword(s):  
Visual Pigments ◽  
Cartilaginous Fishes

Raphe nuclei in three cartilaginous fishes,Hydrolagus colliei,Heterodontus francisci, andSqualus acanthias

1995 ◽  
Vol 358 (3) ◽  
pp. 414-427 ◽  
Author(s):  
Sherry L. Stuesse ◽  
David C. Stuesse ◽  
William L. R. Cruce
Keyword(s):  
Raphe Nuclei ◽  
Cartilaginous Fishes ◽  
Raphé Nuclei

scholarly journals Cartilaginous fishes (Class Chondrichthyes) from the Ichthyological Collection at the Federal University of Paraíba, Brazil

2020 ◽  
Vol 27 (1) ◽  
Author(s):  
Sarah TFL Viana ◽  
Danilo Lima ◽  
Katherine Viana ◽  
Antônio Felinto ◽  
Ricardo de Souza Rosa
Keyword(s):  
Fish Fauna ◽  
Public Consultation ◽  
Type Collection ◽  
Neotropical Fish ◽  
Full List ◽  
Bony Fishes ◽  
Fish Collection ◽  
Cartilaginous Fishes ◽  
Geographical Scope ◽  
Amazonian Region

Federal University of Paraíba (UFPB) ichthyological collection comprises over 11,000 lots of species of cartilaginous and bony fishes from marine, estuarine and freshwater realms. Due to the collection size, rarity of some specimens, taxonomic and geographical scope, this collection represents a substantial archive of the Neotropical fish fauna, especially concerning the Northeast Brazilian region. Currently, UFPB fish collection is under bioinformatization and curatorial transitions. Hence, the present study aimed to provide a detailed analysis of the Chondrichthyan collection database in which the systematic, spatial and chronological coverages are discussed. Full list of collection objects, updated nomenclature and type collection extent are given for public consultation. There are 504 lots of sharks, batoids and chimaeras that are classified within 10 orders, 22 families, 34 genera, and 64 species. Myliobatiformes and Carcharhiniformes represent taxa with higher number of lots in which freshwater stingrays (Potamotrygonidae) and requiem sharks (Carcharhinidae) stand out. Specimens were mostly collected in the marine coastline off Paraíba state and lower Amazonian region, which set UFPB fish collection as an outstanding scientific collection of the regional genetic heritage. 

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