A set of possible sensory system preserved in cuticle of Late Devonian thylacocephalan arthropods from Poland

Broda, Krzysztof; Zatoń, Michał

doi:10.1080/08912963.2017.1284834

Cited by 17 publications

(22 citation statements)

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“…However the last feature is shared with some nektonic arthropods, like amphipods 74 , so except the last one, these features can be observed in modern nektobenthic crustaceans (both swimming and seafloor-dwelling 75 ). Although the anatomy of both raptorial and posterior appendages of the Kowala thylacocephalans remains unknown, the anatomy and architecture of their carapaces were described by Broda and Zatoń 10 . The authors pointed out an additional important feature: the presence of “sensory belts” in the upper and lower margins of the carapace.…”

Section: Discussionmentioning

confidence: 99%

Coincidence of photic zone euxinia and impoverishment of arthropods in the aftermath of the Frasnian-Famennian biotic crisis

Broda

Marynowski

Rakociński

et al. 2019

Sci Rep

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The lowermost Famennian deposits of the Kowala quarry (Holy Cross Mountains, Poland) are becoming famous for their rich fossil content such as their abundant phosphatized arthropod remains (mostly thylacocephalans). Here, for the first time, palaeontological and geochemical data were integrated to document abundance and diversity patterns in the context of palaeoenvironmental changes. During deposition, the generally oxic to suboxic conditions were interrupted at least twice by the onset of photic zone euxinia (PZE). Previously, PZE was considered as essential in preserving phosphatised fossils from, e.g., the famous Gogo Formation, Australia. Here, we show, however, that during PZE, the abundance of arthropods drastically dropped. The phosphorous content during PZE was also very low in comparison to that from oxic-suboxic intervals where arthropods are the most abundant. As phosphorous is essential for phosphatisation but also tends to flux off the sediment during bottom water anoxia, we propose that the PZE in such a case does not promote the fossilisation of the arthropods but instead leads to their impoverishment and non-preservation. Thus, the PZE conditions with anoxic bottom waters cannot be presumed as universal for exceptional fossil preservation by phosphatisation, and caution must be paid when interpreting the fossil abundance on the background of redox conditions.

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Section: Discussionmentioning

confidence: 99%

Coincidence of photic zone euxinia and impoverishment of arthropods in the aftermath of the Frasnian-Famennian biotic crisis

Broda

Marynowski

Rakociński

et al. 2019

Sci Rep

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“…The cuticle displays a polygonal cuticular pattern separated by thin grooves, which are characteristic of thylacocephalans 9 . Secrétan 24 and Broda et al 9,25 also suggested that the presence of a central depression in these polygons, the lumen (Fig. 3d), may represent pores where sensory setae inserted.…”

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confidence: 93%

First African thylacocephalans from the Famennian of Morocco and their role in Late Devonian food webs

Jobbins

Haug²,

Klug

2020

Sci Rep

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thylacocephalans are enigmatic arthropods with an erratic palaeozoic and Mesozoic fossil record. in many of the few localities where they occur, they are quite abundant. this also holds true for the famennian thylacocephalan Layer in the Maider (eastern Anti-Atlas of Morocco), a small epicontinental basin hosting some strata with taphonomic properties of a conservation deposit yielding exceptionally preserved gnathostomes and non-vertebrates. in a thin argillaceous interval in the earliest middle famennian, thylacocephalans occur in such great numbers that they became eponyms of this unit. therein, we discovered a new taxon of thylacocephalans, Concavicaris submarinus sp. nov., which represent the oldest records of thylacocephalans from Africa. in the ct-imagery, the holotype of Concavicaris submarinus sp. nov. revealed anatomical details including its eyes, appendages and other soft parts. Sedimentary facies and faunal composition of the thylacocephalan Layer suggest that these animals populated the water column above the low-oxygen sea floor. Thus, thylacocephalans likely represented an important component of the diet of chondrichthyans and placoderms, which are quite common as well. The abundance of thylacocephalans in other conservation deposits like the Cleveland Shale (USA) and the Gogo formation (Australia) underline their pivotal role in Late Devonian pelagic food webs.

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“…Thus, the phosphatic composition of the cuticle seen in the Kowala specimens is most likely to be the result of early diagenetic phosphatization during taphonomical processes (see Zatoń et al . ; Broda & Zatoń ).…”

Section: Methodsmentioning

confidence: 98%

“…; Broda et al . ; Zatoń & Broda ; Broda & Zatoń, ), phyllocarid remains are phosphatized (based on EDX analyses). As was hypothesized for the Frasnian phyllocarids from the Gogo formation of Western Australia, the cuticle of these arthropods may have been enriched in calcium carbonate (Briggs et al .…”

Section: Methodsmentioning

confidence: 99%

Phyllocarid crustaceans from the Late Devonian of the Kowala quarry (Holy Cross Mountains, central Poland)

Broda

Collette

Budil

2017

Papers in Palaeontology

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Phyllocarida (Crustacea, Malacostraca) are among the most diversified and widespread Late Devonian arthropods. Although previous studies mention phyllocarid fossils from Late Devonian (Frasnian and Famennian) deposits of the Holy Cross Mountains of south‐central Poland, phyllocarids from the Kowala quarry have not been systematically described. Two new species are described from Kowala strata: Echinocaris bisulcata sp. nov. characterized by oval carapace valves with a short hinge line, cone‐like tubercules on the carapace anterior lobe, two pronounced lateral sulci (ventral and median) and two pairs of short spines on every abdominal segment; and Montecaris marynowskii sp. nov. characterized by two pairs of robust abdominal spines, a telson that is shorter than furcal rami, distal parts of which are parallel to the telson, and a body length approximately four times longer than the telson length. Additionally, an isolated furca identified as Dithyrocaris sp. is described herein. Damage observed in the holotype specimen of Montecaris marynowski sp. nov. is consistent with a healed injury, possibly caused by predatory fish. Notes concerning the global occurrences of montecaridids, echinocaridids and the genus Dithyrocaris in the Late Devonian are also provided.

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A set of possible sensory system preserved in cuticle of Late Devonian thylacocephalan arthropods from Poland

Cited by 17 publications

References 50 publications

Coincidence of photic zone euxinia and impoverishment of arthropods in the aftermath of the Frasnian-Famennian biotic crisis

Coincidence of photic zone euxinia and impoverishment of arthropods in the aftermath of the Frasnian-Famennian biotic crisis

First African thylacocephalans from the Famennian of Morocco and their role in Late Devonian food webs

Phyllocarid crustaceans from the Late Devonian of the Kowala quarry (Holy Cross Mountains, central Poland)

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