Further evidence for the presence of holoptychiid porolepiforms (Sarcopterygii, Dipnomorpha) from the Frasnian of Colombia

Mondéjar‐Fernández, Jorge; Janvier, Philippe

doi:10.1016/j.crpv.2014.03.009

Cited by 7 publications

(7 citation statements)

References 32 publications

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“…Such description has turned out to be too broad and matches the general morphology of the scales of many other sarcopterygian taxa (e.g., Janvier 1996;Johanson & Ritchie 2000). However, in depth observations and the combined occurrence of diagnostic features from the external and internal (or visceral) surface of the scales now allows to confidently assign isolated material to Holoptychius (e.g., Miller & Brazeau 2007;Mondéjar-Fernández & Janvier 2014). In contrast to other round-scaled Devonian sarcopterygians, the scales of Holoptychius are characterized by an !…”

Section: Remarksmentioning

confidence: 99%

“…In Ventalepis, the exposed area of certain scales is ornamented by small tubercles made of dentine but no enamel has been identified (Schultze 1980). However, in Holoptychius the superficial ornamentations are reduced to various bony reliefs of the superficial layer of the posterior field; the scales are thus considered to have lost the odontogenic component, with the exception of a narrow anterior area covered with small, probably odontogenic, tubercles occurring in certain specimens (Ørvig 1957;Mondéjar-Fernández & Janvier 2014). Moreover, in Holoptychius the morphology and ornamentation of the scales varies throughout ontogeny (Ørvig 1957) and may even differ across the body.…”

Section: Introductionmentioning

confidence: 99%

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New histological information on Holoptychius Agassiz, 1839 (Sarcopterygii, Porolepiformes) provides insights into the palaeoecological implications and evolution of the basal plate of the scales of osteichthyans

Mondéjar‐Fernández¹,

Meunier

2020

Historical Biology

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The porolepiform sarcopterygian Holoptychius Agassiz, 1839 from the Upper Devonian is one of the most widely found vertebrates in the Palaeozoic fossil record. Holoptychius is considered to display a more ubiquitous mode of life and a greater potential of dispersion than any other sarcopterygian taxon, consistent with its cosmopolitan distribution and profuse fossil record, mainly represented by scales. Previous histological studies on the squamation of Holoptychius have discussed the variable ornamentation of the superficial layer, however the basal plate has been less explored. Here we furnish new histological data on the scales of Holoptychius, focusing on the mineralization rate and organization of the lamellar bone. Ground sections show that the basal plate is made of a stacking of thick collagenous layers with a plywood-like structure. Collagenous fibres are parallel within layers, with two successive layers orthogonally arranged and with every second layer rotated by an angle of 36º. This condition, known as a double-twisted plywood-like organization, is similar to that of other sarcopterygians like Eusthenopteron and extant coelacanths and dipnoans. The new palaeohistological data provide insights into the morphofunctional, palaeoecological and phylogenetical implications of the microstructural characteristics of the scales, adding to our knowledge of the histological diversity of osteichthyans.

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Section: Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New histological information on Holoptychius Agassiz, 1839 (Sarcopterygii, Porolepiformes) provides insights into the palaeoecological implications and evolution of the basal plate of the scales of osteichthyans

Mondéjar‐Fernández¹,

Meunier

2020

Historical Biology

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“…; Andrews & Westoll 1970; Cloutier & Schultze 1996; Miller & Brazeau 2007; Downs et al . 2013; Mondéjar‐Fernández & Janvier 2014), Quebecius quebecensis from the Frasnian of Québec (Schultze & Arsenault 1987; Cloutier & Schultze 1996), and Nasogaluakus chorni from the Emsian of Canada (Schultze 2000). Other porolepiforms are known from less complete or disarticulated material.…”

Section: Figmentioning

confidence: 99%

“…Laccognathus from the Givetian-Frasnian of Europe (L. panderi, L. grossi) and North America (L. embryi) (Gross 1941;Vorobyeva , 2006Downs et al 2011), Holoptychius from the Frasnian-Famennian of Europe (H. flemingi, H. giganteus, H. halli, H. ishora, H. nobilissimus, H. radiatus, H. scheii, H. taylori, H. tuberculatus), North (H. bergmanni, H. jarviki) and South America and Asia (Holoptychius sp.) (Andrews & Westoll 1970;Cloutier & Schultze 1996;Miller & Brazeau 2007;Downs et al 2013;Mondéjar-Fernández & Janvier 2014), Quebecius quebecensis from the Frasnian of Québec (Schultze & Arsenault 1987;Cloutier & Schultze 1996), and Nasogaluakus chorni from the Emsian of Canada (Schultze 2000). Other porolepiforms are known from less complete or disarticulated material.…”

Section: Introductionmentioning

confidence: 99%

Redescription of the cranial skeleton of the Early Devonian (Emsian) sarcopterygianDurialepis edentatusOtto (Dipnomorpha, Porolepiformes)

Mondéjar‐Fernández

Friedman

Giles

2020

Papers in Palaeontology

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Porolepiforms represent a clade of Devonian stem lungfishes, divided into the cosminebearing and likely paraphyletic 'Porolepidae' (e.g., Porolepis, Heimenia) and the cosminefree and stratigraphically younger Holoptychiidae (e.g., Holoptychius, Glyptolepis, Laccognathus). Data on the dermoskeleton are available for both groups, but are more limited for 'porolepids'. Here we present new information on the 'porolepid' Durialepis edentatus from the Emsian (Early Devonian) of Germany based on micro-CT scanning. The material comprises an articulated skull of a single three-dimensionally preserved individual. The arrangement of the cheekbones of Durialepis edentatus recalls that of Porolepis brevis, with the occurrence of two subsidiary squamosals. However, the parieto-ethmoidal and postparietal shields are roughly equal in size, a condition similar to that of Glyptolepis groenlandica and intermediate between Porolepis brevis and holoptychiids. A large parasymphysial tooth plate displays five tooth rows with three large tusks in the median row, another intermediate arrangement between the primitive condition of Porolepis sp. (eight rows) and holoptychiids (five or fewer rows). Remarkably among porolepiforms, this dental plate is perfectly symmetrical. Despite the occurrence of cosmine and rhombic scales, the combination of traits displayed in Durialepis deviates from Porolepis in several ways, reflecting features shared with holoptychiids to the exclusion of other 'porolepids'. Durialepis edentatus is thus a key addition to our knowledge of 'porolepid' anatomy. Because Durialepis edentatus preserves much of the cranial and postcranial skeleton in a single individual, it represents a suitable early dipnomorph representative for inclusion in phylogenetic analyses on sarcopterygians and early osteichthyans.

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“…indet. ) Villarroel, 1998, 2000;Burrow et al, 2003;Janvier and Maisey, 2010;Mondéjar-Fernández and Janvier, 2014). This vertebrate fauna is associated with abundant plant remains (Berry et al, 2000), bivalves, and lingulids, which suggest a low-energy marginal marine to brackish environment (Janvier and Villarroel, 2000).…”

Section: Introductionmentioning

confidence: 99%

New insights into Late Devonian vertebrates and associated fauna from the Cuche Formation (Floresta Massif, Colombia)

Olive

Pradel²,

Martínez‐Pérez

et al. 2019

Journal of Vertebrate Paleontology

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New vertebrate remains are reported from the Late Devonian (?Frasnian) Cuche Formation of northeastern Colombia, including a new taxon of antiarch placoderm (Colombialepis villarroeli, gen. et sp. nov., previously reported as Asterolepis) and a new taxon of arthrodiran placoderm (Colombiaspis rinconensis, gen. et sp. nov.). We also report evidence of a stegotrachelid actinopterygian, a diplacanthid acanthodian (cf. Florestacanthus morenoi), a second antiarch placoderm (Bothriolepis sp.), a putative megalichthyid, and a putative tristichopterid. The absence of typical Euramerican markers, e.g., Asterolepis and Strepsodus, in this assemblage suggests that faunal interchange between Euramerica and Gondwana was less pronounced during the Frasnian-Famennian than previously thought (i.e., the Great Devonian Interchange hypothesis). Three arthropod taxa, including two families of spinicaudatan branchiopods and the eurypterid Pterygotus cf. bolivianus, are found to be associated with the reported vertebrate fauna. Pterygotus cf. bolivianus represents the first eurypterid described from Colombia and the youngest known pterygotid eurypterid, highlighting that pterygotids, which were competitors for large predatory fishes, did not go extinct during the major vertebrate radiation in the Early and Middle Devonian. http://zoobank.org/urn:lsid:zoobank.org:pub:08B0A655-7D78-4B09-B4F4-CF548522D205

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Further evidence for the presence of holoptychiid porolepiforms (Sarcopterygii, Dipnomorpha) from the Frasnian of Colombia

Cited by 7 publications

References 32 publications

New histological information on Holoptychius Agassiz, 1839 (Sarcopterygii, Porolepiformes) provides insights into the palaeoecological implications and evolution of the basal plate of the scales of osteichthyans

New histological information on Holoptychius Agassiz, 1839 (Sarcopterygii, Porolepiformes) provides insights into the palaeoecological implications and evolution of the basal plate of the scales of osteichthyans

Redescription of the cranial skeleton of the Early Devonian (Emsian) sarcopterygianDurialepis edentatusOtto (Dipnomorpha, Porolepiformes)

New insights into Late Devonian vertebrates and associated fauna from the Cuche Formation (Floresta Massif, Colombia)

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