New information on the fishfauna of the Frauenweiler fossil site

Micklich, Norbert

doi:10.1080/11250009809386809

Cited by 23 publications

(17 citation statements)

References 6 publications

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“…The position of the adhesion disc posterior to the skull in †Opisthomyzon disagrees with the supracranial position of living remoras, but corresponds with the arrangement found in generalized percomorphs and, to a lesser degree, that in early developmental stages in extant remoras, where the disc initially develops posterior to the orbits only to later extend to the anterior tip of the snout [5,7,8,36]. Living remoras [35] and other fossil examples [11,12] generally have discs bearing anywhere from 15 to 28 lamellae. Phtheirichthys is unusual among modern remoras in having a count of 9-11 lamellae, but this small number appears to be secondary based on the nesting of this genus high within the crown (figure 2a) [18].…”

Section: (B) Adhesion Discmentioning

confidence: 73%

“…Modern outgroups of remoras bear spiny fins that differ considerably in their architecture, meristic counts and position from suction discs, leaving many questions about how this evolutionary transformation occurred. Because most fossil remoras are assigned to extant genera [11][12][13], they yield no clues beyond those already provided by living taxa. Exceptional among these palaeontological examples is the extinct genus †Opisthomyzon from the early Oligocene (Rupelian; approx.…”

Section: Introductionmentioning

confidence: 99%

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An early fossil remora (Echeneoidea) reveals the evolutionary assembly of the adhesion disc

et al. 2013

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The adhesion disc of living remoras (Echeneoidea: Echeneidae) represents one of the most remarkable structural innovations within fishes. Although homology between the spinous dorsal fin of generalized acanthomorph fishes and the remora adhesion disc is widely accepted, the sequence of evolutionary-rather than developmental-transformations leading from one to the other has remained unclear. Here, we show that the early remora †Opisthomyzon (Echeneoidea: †Opisthomyzonidae), from the early Oligocene (Rupelian) of Switzerland, is a stem-group echeneid and provides unique insights into the evolutionary assembly of the unusual body plan characteristic of all living remoras. The adhesion disc of †Opisthomyzon retains ancestral features found in the spiny dorsal fins of remora outgroups, and corroborates developmental interpretations of the homology of individual skeletal components of the disc. †Opisthomyzon indicates that the adhesion disc originated in a postcranial position, and that other specializations (including the origin of pectination, subdivision of median fin spines into paired lamellae, increase in segment count and migration to a supracranial position) took place later in the evolutionary history of remoras. This phylogenetic sequence of transformation finds some parallels in the order of ontogenetic changes to the disc documented for living remoras.

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Section: (B) Adhesion Discmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

An early fossil remora (Echeneoidea) reveals the evolutionary assembly of the adhesion disc

et al. 2013

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“…In these cases, a shark opens its mouth as a signal to get cleaned between its upper teeth by sharksuckers [25]. This symbiosis has an ancient evolutionary history and was probably initiated back in the Eocene-Oligocene period, when sharksuckers first appeared [65,66]. The interesting part of this cleaner-client relationship is that both the sharksucker and the shark can initiate a cleaning bout.…”

Section: Yawning and Other Jaw Gapesmentioning

confidence: 99%

The Importance of Academic Research in the Field of Shark-Human Interactions: A Three-Pronged Approach to a Better Understanding of Shark Encounters

Ritter¹,

Amin²

2017

Chondrichthyes - Multidisciplinary Approach

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One of the least understood areas of shark research is the interaction between animals and humans, from factors influencing face-to-face encounters to the causes of incidents and behavior patterns. Although some of these questions can be addressed through studies outside of the water, most interaction-related questions have to be tested by direct observation of the sharks. The main goal of our research is to better understand sharks, and what influences them the most when they are in the vicinity of a human being. Our improved understanding of this animal substantiates the notion that sharks are no different from other animal species and do not reflect the still too often presented media monster. Understanding the true nature of this animal transforms this wrongfully described creature into the rather shy and intelligent animal that it truly is.

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“…In addition to plant and invertebrate fossils (Wagner-Klett 1919;Trunkò 1997), finely preserved vertebrates have been found, especially birds (Mayr 2000(Mayr , 2004Mayr et al 2002;Mayr and Manegold 2004). There is also a very rich fossil fish fauna that is significant because of its broad systematic diversity and excellent preservation (Micklich and Parin 1996;Parin and Micklich 1996a, b;Micklich 1998;Pharisat and Micklich 1998;Hovestadt-Euler 1999, 2002;Sakamoto et al 2003Sakamoto et al , 2004Parin and Astakhov 2007). Many specimens are completely articulated because they were deposited in a stratified water body with anoxic conditions in the uppermost layers of the bottom mud, which did not permit decay of organic matter.…”

Section: General Informationmentioning

confidence: 99%

“…Different theories have been presented regarding the paleoenvironmental conditions of the Frauenweiler fossil site (Weber 1951;Weiler 1966;Trunkò 1997;Micklich 1998;Grimm et al 2002). Nevertheless, it is obvious that the fossil fish record of the site is dominated by juvenile individuals, although rather early postlarval stages are not rare.…”

Section: German Specimensmentioning

confidence: 99%

First fossil records of the tholichthys larval stage of butterfly fishes (Perciformes, Chaetodontidae), from the Oligocene of Europe

et al. 2009

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The first fossils of the tholichthys larval stage of a chaetodontid from the lower Oligocene (Rupelian, Fish Shales; about 30.1 MYA) of Frauenweiler (Baden-Würt-temberg, S Germany) are described, along with two less well-preserved probable tholichthys from the lower Oligocene of Przemyśl (Outer Carpathians, SE Poland). The fossils are compared with tholichthys larvae of the extant genus of Chaetodontidae to which they are most similar, namely Chaetodon. The German specimens are identified as tholichthys larvae by the plate-like expansions of the supracleithrum and posttemporal that extend posteriorly well behind the head and by an expanded preopercle with a large posterior spine; these bones, and the frontals and supraoccipital, are distinctively rugose. The Polish specimen from IPM3 has similar features so it is safe to assume that it also is a chaetodontid tholichthys, whereas the specimen from IPM4A is so poorly preserved that it can only very tentatively be referred to the Chaetodontidae. The occurrence of tholichthys larvae prompts reconsideration of the paleoenvironmental situation at their respective fossil sites.

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New information on the fishfauna of the Frauenweiler fossil site

Cited by 23 publications

References 6 publications

An early fossil remora (Echeneoidea) reveals the evolutionary assembly of the adhesion disc

An early fossil remora (Echeneoidea) reveals the evolutionary assembly of the adhesion disc

The Importance of Academic Research in the Field of Shark-Human Interactions: A Three-Pronged Approach to a Better Understanding of Shark Encounters

First fossil records of the tholichthys larval stage of butterfly fishes (Perciformes, Chaetodontidae), from the Oligocene of Europe

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