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  • 1
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    New Devonian Microconchids (Tentaculita) from the Holy Cross Mountains, Poland (2011)
    Paleontological Society
    Details
    Publication Date: 2011-07-01
    Description: Tentaculitoid microconchid tubeworms from Devonian (uppermost Emsian-upper Givetian) deposits of the Holy Cross Mountains, Poland, include three new species from stratigraphically well-constrained lithological units: Polonoconchus skalensis n. gen. n. sp., Palaeoconchus sanctacrucensis n. sp. and Microconchus vinni n. sp. The microconchids inhabited fully marine environments during transgressive pulses, as is evidenced from facies and associated fossils. Polonoconchus skalensis n. gen. n. sp. and Palaeoconchus sanctacrucensis n. sp. inhabited secondary firm- to hard-substrates in deeper-water, soft-bottom environments. They developed planispiral, completely substrate-cemented tubes and planispiral tubes with elevated apertures, which is indicative of environments where sedimentation rate is low but competition for space (by overgrowth) may be high. Microconchus vinni n. sp., on the other hand, developed a helically coiled distal portion of the tube as a response to a high sedimentation rate. As the taxonomic composition of Devonian microconchids is poorly recognized at both regional and global scales, this new material contributes significantly to our understanding of the diversity of these extinct tube-dwelling encrusters.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
    Published by Paleontological Society
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    PAPER CURRENT
  • 2
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    Redescription and Neotype Designation of the Middle Devonian Microconchid (Tentaculita) Species ‘Spirorbis’ Angulatus Hall, 1861 (2012)
    Paleontological Society
    Details
    Publication Date: 2012-05-01
    Description: The Middle Devonian (Givetian) microconchid tubeworm species known as Spirorbis angulatus Hall, 1861 is redescribed here on the basis of a new collection from the Traverse Group of Michigan and Hamilton Group of Ohio and New York, U.S.A. Its general characteristics and ornamentation indicate it belongs to the genus Palaeoconchus Vinn, 2006. Because the original specimens on which the species was erected are lost, a neotype is here designated for a specimen from the same area (Erie County, New York) and stratigraphic interval (Hamilton Group, Givetian) as the original specimens described by Hall (1861). The new specimens of Palaeoconchus angulatus (Hall) show that the species is characterized by a spectrum of morphological variability, possibly ranging from a nearly smooth tube, though weakly ornamented, to one distinctly tuberculated on which thicker nodes and thin spines may occur together. Assemblages of microconchids from particular stratigraphic divisions are characterized by a dominance of small (up to 1.5 mm in diameter, probably juvenile) individuals, while larger individuals (〉2 mm) are rare. This suggests that the populations may have experienced occasional mass mortalities. Although substrate (in this case brachiopod shells and rugosan coral thecae) overturning and an increase in sedimentation rate are possible factors, an episodic anoxia/dysoxia of the bottom waters seems likely as it is known that the host dark shales record such occasional oxygen deficiency.
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
    Published by Paleontological Society
    Location Call Number Limitation Availability
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    PAPER CURRENT
  • 3
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    Abundance of sclerobionts and presence of malformation on Middle Devonian brachiopods from Skały, Poland (Dobruchna Member, Skały Formation) (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-27
    Description: Brachiopod shells were collected from a large heap adjacent to the Semav Stones Skała Quarry in Skały (Holy Cross Mountains, Poland) in order to describe sclerobiont diversity, abundance and colonization patterns. All specimens derive from the Dobruchna Brachiopod Shale Member of the shaly-calcareous Skały Formation (ensensis conodont Zone, Eifelian). Both articulated shells and isolated valves were sampled, but fragmentary specimens were excluded. Each brachiopod specimens (separately dorsal and ventral valves) was inspected under a binocular microscope for the presence of sclerobionts and shell malformations. Each sclerobiont was determined to the lowest possible taxonomic level and counted. Well-separated colonies of clonal epibionts were treated as separate specimens. Only brachiopod specimens with at least one sclerobiont or malformation are included in the dataset.
    Keywords: Allonema; Anticalyptraeida; Ascodictyon; Auloporida; borers; Brachiopoda; Brachiopoda indeterminata; Branched microborings; Bryozoa indeterminata; Canaliparva; Clionoides; Clionolithes; Cornulitida; Counting, light microscope; Crinoidea; Cyclostomata; Cystoporata; Deliella; Devonian; encrusters; Hederelloidea; Identification; Indeterminata; Malformation; Microconchida; Oichnus; Orbiculoidea; OUTCROP; Outcrop sample; Palaeoecology; Poland; Productida; Rothpletzella; Rugosa; Sclerobionts; Skaly_quarry; Specimen identification; Sphenothallus; Taxon/taxa; Tolypammina; Trepostomata; Valve; Vinella
    Type: Dataset
    Format: text/tab-separated-values, 80832 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Abundance of skeletobionts on Middle Devonian brachiopods from Madène el Mrakib, Morocco (Eifelian–Givetian transition, Taboumakhloûf Formation) and R code for analysing colonization patterns (2024)
    PANGAEA
    Details
    Publication Date: 2024-05-21
    Description: Brachiopod shells were collected from the scree directly adjacent to the exposures in Madène el Mrakib in order to describe skeletobiont diversity, abundance and colonization patterns, and their relation to host shell morphology. The studied specimens originate from the fossiliferous, thin-bedded, 2.5 m-thick nodular limestone (mudstone to packstone) belonging to Taboumakhloûf Formation and placed at the transition of the uppermost Eifelian (ensensis Zone) and lowermost Givetian (hemiansatus Zone) based on conodont dating. Further details can be found in Zatoń et al. (2022). The brachiopod specimens, both articulated shells and isolated valves, were collected randomly without regard for the presence of skeletobionts. Each brachiopod specimen (separately dorsal and ventral valves) was inspected under a binocular microscope and each skeletobiont was determined to the lowest possible taxonomic level and counted. For colonial organisms, each individual colony was counted as one specimen. Among brachiopod specimens without any skeletobionts only well preserved and articulated shells are included in the dataset. The external surface area of the selected, well-preserved and complete shells of the five dominant brachiopod species was measured using a square-gridded plankton net (1 x 1 cm), with a mesh size of 1 mm2.
    Keywords: Allonema; Anticalyptraeida; Ascodictyon; Auloporida; Bioerosion; Brachiopoda; Brachiopoda indeterminata; Bryozoa indeterminata; Clionolithes; Coenitidae; Cornulitida; Craniidae; Crinoidea; Cyclostomata; Cystoporata; Devonian; Encrustation; Favositida; Fenestrata; Hederelloidea; Light microscope; Madene_el_Mrakib; Madène el Mrakib section, Mader Basin, eastern Anti-Atlas, Morocco; Microconchida; Oichnus; OUTCROP; Outcrop sample; Palaeoecology; Problematica; Productida; Rhabdomesida; Rothpletzella; Rugosa; Sclerobionts; Shell completeness; Shell size; Skeletobionts; Specimen identification; Sponge; Surface area; Surface preservation; Taxon/taxa; Tetrataxis; Tolypammina; Trepostomata; Valve; Vinella
    Type: Dataset
    Format: text/tab-separated-values, 62260 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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