Topic
Eastmanosteus
About: Eastmanosteus is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 124 citations.
Papers
TL;DR: The oldest soft tissue discovered in gnathostomes is described, which includes striated muscle fibres, circulatory and nerve tissues, preserved as phosphatized structures precipitated by microbial infilling of small, protected areas under the headshield of the arthrodire, Eastmanosteus calliaspis.
Abstract: In this paper, we show exceptional three-dimensionally preserved fossilized muscle tissues in 380–384 Myr old placoderm fish (Late Devonian), offering new morphological evidence supporting the hypothesis that placoderms are the sister group to all other gnathostomes. We describe the oldest soft tissue discovered in gnathostomes, which includes striated muscle fibres, circulatory and nerve tissues, preserved as phosphatized structures precipitated by microbial infilling of small, protected areas under the headshield of the arthrodire, Eastmanosteus calliaspis . Muscle impressions have also been found in the ptyctodontid, Austroptyctodus gardineri . The specimens display primitive vertebrate muscle structures; in particular, shallow W-shaped muscle blocks such as those observed in lampreys. New information from fossilized soft tissues thus elucidates the affinities of the placoderms and provides new insights into the evolution and radiation of gnathostomes.
67 citations
Journal Article•
TL;DR: Taxonomy of the Late Devonian placoderm remains from the Holy Cross Mountains, Poland, described by Gorizdro-Kulczycka (1934, 1950) and Kulczycki (1956, 1957), is revised and several recently found specimens are mentioned.
Abstract: Taxonomy of the Late Devonian placoderm remains from the Holy Cross Mountains, Poland, described by Gorizdro-Kulczycka (1934, 1950) and Kulczycki (1956, 1957), is revised. Several recently found specimens are also mentioned. The old collections are composed of representatives of Ptyctodontidae, Holonematidae, Plourdosteidae, Pholidosteidae, Selenosteidae, Titanichthyidae and Dinichthyidae, the latter with an undescribed species of Eastmanosteus. Newly found specimens belong to Ptyctodontidae, Plourdosteidae and Dinichthyidae. The occurrence of the Antiarcha in the Late Devonian of the Holy Cross Mountains, suggested by former authors, has not been confirmed.
17 citations
TL;DR: The first record of the genus E. lundarensis from the Middle Devonian (Late Eifelian) was found in three limestone quarries in the Elm Point and Winnipegosis formations near Lake Manitoba, south-central Manitoba as discussed by the authors.
Abstract: Fish remains from the Middle Devonian (Late Eifelian) were found in three limestone quarries in the Elm Point and Winnipegosis formations, near Lake Manitoba, south-central Manitoba. The arthrodire material represents a taxon previously unknown from Manitoba. Eastmanosteus lundarensis sp. nov., is described based on an articulated, nearly complete cranial roof and incomplete cranial roof, a suborbital plate and thoracic shield fragments. E. lundarensis is the oldest representative of the genus, and is the first record of the genus in Canada. E. lundarensis is most similar to the other North American and European Eastmanosteus species rather than the two Australasian Eastmanosteus species and Golshanichthys.
4 citations
TL;DR: Well preserved material of the parasphenoid and scapulocoracoid throws further light on the structure of these elements in arthrodires.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2007 | 1 |
| 1997 | 1 |
| 1996 | 1 |
| 1987 | 1 |