The middle Paleozoic Selachian genus<i>Thrinacodus</i>

Ginter, Michał; Turner, Susan

doi:10.1080/02724634.2010.520785

Cited by 11 publications

(17 citation statements)

References 19 publications

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“…Lund and Grogan (1997) later mentioned that the accumulated evidence seemed to support the elongation of the second dorsal fin into the single fin found in these taxa as a derived condition. Additionally, the dorsal fin is described as entirely lacking in Thrinacodus (= Thrinacoselache) gracia (Phoebodontiformes; Ginter & Turner, 2010;Grogan & Lund, 2008). Miller et al, 2003;Turner & Miller, 2005) spines, it has also been suggested that a spine originally interpreted as forming the leading edge of a dorsal fin (Young, 1982(Young, , 1989 could be reinterpreted as a pectoral fin-spine in Antarctilamna prisca (Antarctilamniformes) from the Middle/Upper Devonian of Antarctica and Australia (Hanke & Wilson, 2010;Miller et al, 2003;Wilson et al, 2007).…”

Section: Heteropetalus and Chondrenchelyiformes Or Two Dorsal Fins Amentioning

confidence: 99%

A critical appraisal of appendage disparity and homology in fishes

2019

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Fishes are both extremely diverse and morphologically disparate. Part of this disparity can be observed in the numerous possible fin configurations that may differ in terms of the number of fins as well as fin shapes, sizes and relative positions on the body. Here, we thoroughly review the major patterns of disparity in fin configurations for each major group of fishes and discuss how median and paired fin homologies have been interpreted over time. When taking into account the entire span of fish diversity, including both extant and fossil taxa, the disparity in fin morphologies greatly complicates inferring homologies for individual fins. Given the phylogenetic scope of this review, structural and topological criteria appear to be the most useful indicators of fin identity. We further suggest that it may be advantageous to consider some of these fin homologies as nested within the larger framework of homologous fin‐forming morphogenetic fields. We also discuss scenarios of appendage evolution and suggest that modularity may have played a key role in appendage disparification. Fin modules re‐expressed within the boundaries of fin‐forming fields could explain how some fins may have evolved numerous times independently in separate lineages (e.g., adipose fin), or how new fins may have evolved over time (e.g., anterior and posterior dorsal fins, pectoral and pelvic fins). We favour an evolutionary scenario whereby median appendages appeared from a unique field of competence first positioned throughout the dorsal and ventral midlines, which was then redeployed laterally leading to paired appendages.

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Section: Heteropetalus and Chondrenchelyiformes Or Two Dorsal Fins Amentioning

confidence: 99%

A critical appraisal of appendage disparity and homology in fishes

2019

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“…Despite a lack of Phoebodus species in the Bugle Gap Limestone, the recovered shark species exhibit comparable ages for the same species found in other areas of the world. Of these, Thrinacodus tranquillus has been recorded as occurring from the Middle to Late Devonian in Laurussia and North Gondwana (Ginter and Turner 2010). The presence of this species in the Canning Basin makes it one of the oldest global occurrences (Upper marginfera CZ) with similar ages recorded in Morocco, South China and Iran (Lelièvre and Derycke 1998;Hairapetian and Long 2000;Ginter et al 2002).…”

Section: Biostratigraphymentioning

confidence: 99%

“…Previous work Ginter et al 2002;Duncan 2003;Ginter and Turner 2010) has suggested the presence of two tooth types; the first with a flattened base positioned asymmetrically in relation to the crown and a smaller almost completely symmetrical form (Duncan 2003). The first morphotype (Text-fig 4A) is the most common tooth form attributed to Th.…”

Section: Distribution and Stratigraphic Rangementioning

confidence: 99%

“…The first morphotype (Text-fig 4A) is the most common tooth form attributed to Th. tranquillus and has been reported from various locations across northern Gondwana (Ginter and Turner 2010). The second, smaller morphotype (Text- fig.…”

Section: Distribution and Stratigraphic Rangementioning

confidence: 99%

“…4B), which has had its assignment to Th. tranquillus recently questioned (Ginter and Turner 2010), is less common and with few examples recorded from the Montagne Noire . Based on reconstructions of tooth placement within thrinacodont jaws (Turner 1982;Ginter et al 2002;Duncan 2003), the supposed symmetrical symphyseal teeth only comprise a small proportion of teeth thus likely lower yields of these teeth are to be expected.…”

Section: Distribution and Stratigraphic Rangementioning

confidence: 99%

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Upper Devonian microvertebrates from the Canning Basin, Western Australia

Roelofs

Playton

Barham

et al. 2015

Acta Geologica Polonica

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A diverse microvertebrate fauna is described from the Virgin Hills and Napier formations, Bugle Gap Limestone Canning Basin, Western Australia. Measured sections at Horse Spring and Casey Falls (Virgin Hills Formation) and South Oscar Range (Napier Formation) comprise proximal to distal slope carbonates ranging in age from the Late Devonian Frasnian to middle Famennian. A total of 18 chondrichthyan taxa are identified based on teeth, including the first record of Thrinacodus tranquillus, Cladoides wildungensis, Protacrodus serra and Lissodus lusavorichi from the Canning Basin. A new species, Diademodus dominicus sp. nov. is also described and provides the first record of this genus outside of Laurussia. In addition, the upper range of Australolepis seddoni has been extended to Late Devonian conodont Zone 11, making it the youngest known occurrence for this species. The Virgin Hills and Napier formations microvertebrate faunas show close affinities to faunas recovered from other areas of Gondwana, including eastern Australia, Iran, Morocco and South China, which is consistent with known conodont and trilobite faunas of the same age.

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