Otomorphs (= otocephalans or ostarioclupeomorphs) revisited

Arratia, Gloria

doi:10.1590/1982-0224-20180079

Cited by 11 publications

(15 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results fully support the lack of PU1 in zebrafish [11,13], also reported for the consolidated terminal vertebra present in the euteleost Mallotus [12], and the siluriform Ictalurus [60]. By contrast, a PU1 is present among all studied caudal skeletons with unconsolidated terminal vertebrae, such as salmoniforms [10], the alepocephaliform Talismania [27] and some clupeomorphs [11,61]. Thus, the distribution of this character seems to be related with the acquisition of a consolidated caudal skeleton.…”

Section: Absence Of a Preural Centrumsupporting

confidence: 88%

“…A single ural centrum forming above hypurals 1 and 2 is the most common pattern across basal teleosts, including †Leptolepis, †Ascalabos, †Tharsis, Elops, Hiodon, salmoniforms, alepocephaliforms and clupeomorphs [11,27]. However, a common variation from this pattern involves the formation of two independent U1 P and U2 P centra that, as in zebrafish, are occasionally observed in the salmoniforms Thymallus and Oncorhynchus [10] and in the fossil osteoglossomorphs †Asiatolepis and †Lycoptera [11].…”

Section: Compound Centrummentioning

confidence: 99%

“…This fusion occurs after the perichondral ossification of hypural 2 reaches its base and contacts the centrum, where it fuses to the autocentral ossification of the compound centrum and the membranous ossification of the pleurostyle. This compound centrum/hypural 2 fusion seems to be a homoplastic character that has been convergently acquired among otophysans [15], gonorynchids [65] and clupeomorphs [66], while it is absent in Chanos and most kneriids among gonorynchiforms [65], as well as in alepocephaliforms [27] and in the stem ostariophysan †Tischlingerichthys [4] and in the stem otophysans †Chanoides and †Nardonoides [64].…”

Section: Hypuralmentioning

confidence: 99%

“…: Elops, Hiodon, Thymallus, Sprattus, Alepocephalus; Fig. 1) [8][9][10][11]27]. This transition from polyural to diural is also observed during the ontogeny of modern teleosts, for example in Hiodon, Elops and salmonids [8,10], where distinct and separate vertebral centra may form at the base of the hypurals in a sequential and metameric pattern.…”

Section: Introductionmentioning

confidence: 99%

“…Several questions remain about the developmental and evolutionary processes leading to the formation of the single compound terminal centrum in ostariophysans, including its fusion to the hypurals and the pleurostyle [11,27]. Among them, there is the ontogenetic pathway leading towards the formation of the vertebral centrum that involves the association throughout development between an inner mineralization of the middle layer of the notochordal sheath to form a ring-like chordacentrum [6,[32][33][34] and an outer ossification outside of the external notochordal sheath to form an hourglass-shaped autocentrum [6,11,33,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

From Devo to Evo: patterning, fusion and evolution of the zebrafish terminal vertebra

2020

Self Cite

View full text Add to dashboard Cite

Background: With more than 30,000 species, teleosts comprise about half of today's living vertebrates, enriched with a wide set of adaptations to all aquatic systems. Their evolution was marked by modifications of their tail, that involved major rearrangements of the metameric organization of the axial skeleton. The most posterior or ural caudal skeleton, primitively included more than 10 vertebrae and, through a series of fusions and losses, became reduced to a single vertebra in modern ostariophysans, one of the largest clades of teleosts. The ontogeny of the ostariophysan Danio rerio recapitulates this process by forming two or three separate vertebrae that become a single vertebra in adults. We characterize the developmental sequence of this change by describing the processes of patterning, fusion and differential growth on each of the constitutive elements that sculpt the adult terminal vertebra. Results: The ontogenetic changes of the terminal vertebra were characterized, highlighting their shared and derived characters in comparison with other teleosts. In zebrafish, there is: i) a loss of the preural centrum 1, ii) the formation of an hourglass-shaped autocentrum only in the anterior but not the posterior border of the compound centrum, iii) the formation of a vestigial posterior centrum that does not form an autocentrum and becomes incorporated beneath the compound centrum during development, and iv) the elongated dorso-posterior process of the compound centrum or pleurostyle appears as an independent element posterior to the compound centrum, before fusing to the ural neural arches and the anterior portion of the compound centrum. Conclusions: The unique features of the formation of the terminal vertebra in Danio rerio reflect the remarkable changes that occurred during the evolution of teleosts, with potential shared derived characteristics for some of the major lineages of modern teleosts. A new ontogenetic model is proposed to illustrate the development of the terminal vertebra, and the phylogenetic implications for the evolution of caudal skeleton consolidation in ostariophysans are discussed.

show abstract

Section: Absence Of a Preural Centrumsupporting

confidence: 88%

Section: Compound Centrummentioning

confidence: 99%

Section: Hypuralmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

From Devo to Evo: patterning, fusion and evolution of the zebrafish terminal vertebra

2020

Self Cite

View full text Add to dashboard Cite

show abstract

The pelvic girdle in extant gonorynchiformes (Teleostei: Otomorpha)

Koch,

Moritz

2024

Zoomorphology

View full text Add to dashboard Cite

Otophysi is one of the most important fish taxa of the world, as they make up for roughly 28% of all fish species and about two-thirds of all freshwater species worldwide. To understand their success and evolutionary history their sister-group, the Gonorynchiformes, take a key-position, e.g., for reconstructing morphological conditions in the latest common ancestors. Gonorynchiformes comprising only 40 species and have been often studied for that reason. Their pelvic girdle, however, got only little attention so far. Therefore, we studied this structure in extant gonorynchiforms and described the ontogeny in Kneria stappersii. In gonorynchiforms: (1) their basipterygium is principally flat (without dorsal or ventral projections) and placed in horizontal position, (2) has a ‘simple’ shape, i.e., it has only a single anterior process with small cartilaginous tips and becomes wider in its posterior part with a medial portion connecting to the basipterygium of the other side; (3) three radials and a pelvic splint are present, and (4) a prominent posterior process is missing. Although, the morphological situation is a lot similar as seen in clupeiforms and alepocephaliforms. Therefore, these characters have likely been present in the stem of Otomorpha, Ostariophysi, and Otophysi, but within the latter taxon eventually, a higher diversity of pelvic girdle morphology arose during evolution.

show abstract

The diversity of teleost fishes during the terminal Cretaceous and the consequences of the K/Pg boundary extinction event

Schwarzhans,

Carnevale,

Stringer

2024

Netherlands Journal of Geosciences

View full text Add to dashboard Cite

The Late Cretaceous was a time of blossoming teleost diversification that came to a sudden restriction and partial termination during the extinction event at the Cretaceous–Paleogene (K/Pg) boundary. Among the dominant and diverse Late Cretaceous teleost groups prior to the K/Pg boundary event were certain pelagic Aulopiformes (e.g., Ichthyotringoidei and Enchodontoidei) and a large variety of basal Acanthomorpha whose relationships are difficult to determine. The skeletal record diminishes during the late Campanian and is low in the Maastrichtian and Paleocene, constituting the so-called ‘Patterson’s Gap’. Recent studies of fossil otoliths, however, have significantly increased the number of taxa recognised for this time inerval, but most of the putative extinct forms lack adequate calibration with otoliths found in situ in articulated skeletons. However, the otolith assemblages do confirm the presence of great morphological diversity among Aulopiformes and Acanthomorpha incertae sedis that became extinct at the K/Pg boundary. In the present review, we elucidate the effect of the K/Pg boundary from an otolith perspective and categorise extinct lineages and survivors. It is interesting to recognise that several of the surviving lineages are represented by groups that probably originated during the Late Cretaceous but were not particularly common up to the K/Pg boundary and began to expand rapidly and diversify during the early Paleogene. Such lineages probably took advantage to populate void ecospace that may have opened following the extirpation of previously dominant lineages. During the early Paleogene, the otolith record shows that the Ophidiiformes and perciforms s. lat. were the ones that diversified the most rapidly and became the most abundant, and in certain areas associated with the Gadiformes.

show abstract

Otomorphs (= otocephalans or ostarioclupeomorphs) revisited

Cited by 11 publications

References 59 publications

From Devo to Evo: patterning, fusion and evolution of the zebrafish terminal vertebra

From Devo to Evo: patterning, fusion and evolution of the zebrafish terminal vertebra

The pelvic girdle in extant gonorynchiformes (Teleostei: Otomorpha)

The diversity of teleost fishes during the terminal Cretaceous and the consequences of the K/Pg boundary extinction event

Contact Info

Product

Resources

About