A New Genus of Lungfish from the Givetian (Middle Devonian) of Central Australia

Clement, Alice M.

doi:10.4202/app.2008.0057

Cited by 8 publications

(9 citation statements)

References 36 publications

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“…Tooth plates with distinct denticles organised into discrete rows (Figs 3A, B, 5A, B) are found in many Devonian genera ( Andreyevichthys , Krupina 1987; Dipterus , White 1965; Harajicadipterus , Clement 2009; Scaumenacia , Cloutier 1996). The only other Gogo genus with similar radial tooth plates known, Adololopas (Campbell and Barwick 1998), has thick, flat dentine that separates into broad ridges anteriorly.…”

Section: Discussionsupporting

confidence: 62%

“…Numerous authors have attempted to clarify the interrelationships of Devonian dipnoans (Thomson and Campbell 1971; Miles 1977; Marshall 1986; Campbell and Barwick 1990; Krupina and Reisz 2000; Schultze 2001; Ahlberg et al . 2006; Friedman 2007; Clement 2009; Qiao and Zhu 2009; Clement and Long 2010 b ). Early attempts failed to clarify the position of Rhinodipterus within the Dipnoi (Miles 1977; Marshall 1986).…”

Section: Discussionmentioning

confidence: 99%

“…D ipnoans , or lungfishes, are a group of sarcopterygian fish that first appeared some 400 Ma during the Early Devonian (Jarvik 1967; Denison 1968; Thomson and Campbell 1971; Campbell and Barwick 1983; Chang and Yu 1984). Initially a marine group, some lungfishes started to make the transition to freshwater environments from the Early (Denison 1968) and Middle Devonian (Campbell and Barwick 1986; Long 1992 a ; Newman and den Blaauwen 2007; Clement 2009). However, marine sites show the highest species diversity (Schultze and Cloutier 1996).…”

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confidence: 99%

“…Most of the recent cladistic analyses of Devonian dipnoans have not included Rhinodipterus (Ahlberg et al . 2006; Friedman 2007; Clement 2009; Clement and Long 2010 b ). The new analysis, based on neurocranial characters, presented here groups Rhinodipterus with Orlovichthys .…”

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confidence: 99%

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A new species of long‐snouted lungfish from the Late Devonian of Australia, and its functional and biogeographical implications

Clement¹

2012

Palaeontology

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A new species of the Late Devonian lungfish Rhinodipterus is described from the Frasnian Gogo Formation, northern Western Australia. The description is based on a single specimen preserved in a small concretion, represented by elements of the skull roof, lower jaw, palate, neurocranium, hyoid arch, pectoral girdle and other parts of the postcranial skeleton. Rhinodipterus kimberleyensis sp. nov. differs from other species in the shape of its parasphenoid, number of tooth rows, nature of the tooth plates and characteristics of the skull roof. Functional morphology suggests Rhinodipterus kimberleyensis sp. nov. had a weak bite and may have fed off the reef substrate. Rhinodipterus kimberleyensis sp. nov. possessed a suite of skeletal characters that suggest it may have breathed air. Morphological comparison and a cladistic analysis place Rhinodipterus crown-ward of all other Gogo lungfishes and closely related to Oervigia, Andreyevichthys and Orlovichthys. Faunal comparisons between Australia and Laurussia indicate palaeobiogeographical links existed between these landmasses during the Middle to Late Devonian.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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A new species of long‐snouted lungfish from the Late Devonian of Australia, and its functional and biogeographical implications

Clement¹

2012

Palaeontology

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“…Of the sarcopterygian groups that existed during the Devonian, the Dipnoi represent one of the most diverse with more than 85 species being recorded from this period (Cloutier and Ahlberg ). By the Middle Devonian, the Dipnoi had diversified into freshwater habitats (Denison ; Campbell and Barwick ; Long ; Newman and den Blaauwen ; Clement ) and evolved the ability to breathe atmospheric air (Clement and Long ). Naturally, research has focused on how change in the cranial skeleton manifests itself during such transitions and periods of diversification (Ahlberg et al .…”

Section: History Of Researchmentioning

confidence: 99%

The cranial endocast of the Middle Devonian dipnoan Dipterus valenciennesi and a fossilized dipnoan otoconial mass

Challands

2015

Papers in Palaeontology

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The well known Middle Devonian (Eifelian–Givetian) lungfish Dipterus valenciennesi from Scotland, UK, has been studied for more than one hundred years though our understanding of the neurocranium and cranial cavity is incomplete. Micro‐CT scanning demonstrates that the internal cast of the cranial cavity, the endocast, possesses a mix of primitive and derived characters. The olfactory bulbs are sessile, as in the derived extant Lepidosirenidae. However, Dipterus valenciennesi possesses the primitive condition of a shallow telencephalon unlike Upper Devonian forms such as Rhinodipterus kimberleyensis and extant lungfish taxa. Further information revealed by micro‐CT scanning has allowed coding for characters pertaining to the neurocranial cristae, previously unobservable in Dipterus valenciennesi, allowing hypotheses of relationships between Devonian Dipnoi and the position of Dipterus valenciennesi to be reassessed. New analyses do not refine the phylogenetic position of Dipterus valenciennesi but do increase support for most recently established Devonian dipnoan phylogeny. The first record of a three‐dimensionally preserved fossilized otoconial mass from the utricular recess in a fossil dipnoan is also described. Comparison of morphometric data of the endosseous and soft tissue manifestations of the labyrinth system in extant dipnoan taxa demonstrates that there is largely good correspondence between the two. When compared to Dipterus valenciennesi, extant taxa exhibit semi‐circular canals that are reduced in length. Furthermore, compared to Dipterus, in extant dipnoan taxa the size of the otoconial mass has increased relative to the utricular and sacculolagenar pouches containing them. The functional implications for these observations suggest that the Dipnoi have evolved towards a more sedentary lifestyle and behaviour at least since the Middle Devonian.

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A Lungfish (Sarcopterygii, Dipnomorpha) Tooth Plate from the Lower Devonian of Vietnam and the Onset of Modern Dipnoan Dental Organization

Mondéjar‐Fernández

Challands

Huu

et al. 2020

Journal of Vertebrate Paleontology

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An isolated pterygoid tooth-plate of a lungfish from the Lower Devonian (Lochkovian-Pragian) of Vietnam is described. The material is negatively preserved and lacks associated jawbones to assign a reliable taxonomic status and phylogenetic position. The tooth-plate is composed of five main tooth-rows radially arranged, separated by several interrow denticles and flanked medially and laterally by smaller accessory rows and by a denticulated posterolateral field. The general structure of the tooth-plate displays predominantly primitive traits similar to those known in its contemporaneous Diabolepis from China. However, as opposed to Diabolepis, the tooth-plate possesses fewer and more organized rows of teeth, a condition typical of more derived dipnoans. Comparisons with other primitive forms indicate that the arrangement of teeth into distinct rows with a lack of interrow denticles is typical of juvenile specimens of Diabolepis which may imply that the presence of discrete tooth rows in more derived lungfish taxa is a product of paedomorphosis.Given its puzzling mix of primitive and derived features, this new pterygoid tooth-plate can be tentatively assigned to a previously known lungfish prearticular from Northern Vietnam, although with caution. Pending the finding of more complete remains, the condition showed by this new form might indicate that the establishment of the modern lungfish tooth-plate organization occurred no later than the Pragian.

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A New Genus of Lungfish from the Givetian (Middle Devonian) of Central Australia

Abstract: A new

Cited by 8 publications

References 36 publications

A new species of long‐snouted lungfish from the Late Devonian of Australia, and its functional and biogeographical implications

A new species of long‐snouted lungfish from the Late Devonian of Australia, and its functional and biogeographical implications

The cranial endocast of the Middle Devonian dipnoan Dipterus valenciennesi and a fossilized dipnoan otoconial mass

A Lungfish (Sarcopterygii, Dipnomorpha) Tooth Plate from the Lower Devonian of Vietnam and the Onset of Modern Dipnoan Dental Organization

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