Cyclotosaurus cf. Posthumus Fraas (Capitosauridae, Stereospondyli) from the Huai Hin Lat Formation (Upper Triassic), Northeastern Thailand

Ingavat, Rucha; Janvier, Philippe

doi:10.1016/s0016-6995(81)80149-0

Cited by 31 publications

(10 citation statements)

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“…Milner's results partially agree with the non-cladistic schemes drawn by Ochev (1966), Chernin and Cosgriff (1975), Shishkin (1980), and Kamphausen (1989). Their views are contrasted by Ingavat and Janvier's (1981) study. Most recently, Maryan Âska and Shishkin (1996) sketched the phylogeny of some capitosaurs, emphasizing the occurence of various parallelisms.…”

Section: H I S T O R Y O F T H E P R O B L E Mmentioning

confidence: 91%

“…The phylogeny of capitosaurs has only recently been tentatively studied on the basis of phylogenetic systematics (Ingavat and Janvier 1981;Milner 1990Milner , 1993Gubin 1997). A detailed phylogenetic analysis which relies on clear outgroup comparison, explicit character recognition, and a test of congruence is still lacking for capitosaurs in general.…”

Section: Ca P I T O S a U R S Form A Large Group Of Widespread And Abmentioning

confidence: 99%

“…Morales (1987) reported a ®rst cladistic study on the phylogeny of the group, but did not clarify his data set. Ingavat and Janvier (1981) and Milner (1990) presented the ®rst sound phylogenetic analyses of capitosaurs. While the former authors focused mainly on the genera Cyclotosaurus and Eocyclotosaurus, the latter discussed aspects of the capitosaurid ground-plan.…”

Section: H I S T O R Y O F T H E P R O B L E Mmentioning

confidence: 99%

“…This concept derived in part from that of Shishkin (1980), Kamphausen and Morales (1981) and Kamphausen (1989), and it was also partly still implicitly accepted by Paton (1974). An alternative hypothesis of the relationships between Eocyclotosaurus (and other Anisian cyclotosaur-like forms) and capitosaurids was discussed by Ingavat and Janvier (1981).…”

Section: T H E C a P I T O S A U R I D C O N C E P Tmentioning

confidence: 99%

“…The concept of a general phylogenetic trend in capitosaur phylogeny was frequently utilized (among other sources) to correlate horizons of Triassic terrestrial sediments (Watson 1958; Welles and Cosgriff 1965;Ochev 1966; Kamphausen and Morales 1981). Capitosaurs have become a predominant component of such correlations in recent years (Ochev and Shishkin 1989;Shishkin et al 1995;Hancox et al 1995).The phylogeny of capitosaurs has only recently been tentatively studied on the basis of phylogenetic systematics (Ingavat and Janvier 1981;Milner 1990Milner , 1993Gubin 1997). A detailed phylogenetic analysis which relies on clear outgroup comparison, explicit character recognition, and a test of congruence is still lacking for capitosaurs in general.…”

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The Origin And Intrarelationships Of Triassic Capitosaurid Amphibians

Schoch

2000

Palaeontology

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ABSTRACT. The status of the temnospondyl family Capitosauridae is reviewed. Only by the inclusion of the genera Mastodonsaurus and Eocyclotosaurus can this group be considered monophyletic. This view is based on a range of robust characters which in combination constitute the most parsimonious hypothesis. The traditional view that Mastodonsaurus and Eocyclotosaurus are sister taxa of Benthosuchus is demonstrated to be based on highly variable and/or homoplastic features, whose ancestral condition is moreover uncertain. The Capitosauridae encompasses the following successive sister groups: (1) various species of Parotosuchus (which do not necessarily form a monophylum); (2) the genera Eryosuchus and Mastodonsaurus (which are probably monophyletic); and (3) a range of taxa with semi-closed or entirely closed otic notches, including the genera Wellesaurus, Kupferzellia, Eocyclotosaurus, and Cyclotosaurus. The closure of the otic notch, an oft-cited trend among capitosaurs, is most easily explained to have occurred only once, namely within the more advanced capitosaurids; the stratigraphical signi®cance of this feature is, however, very limited.KEY WORDS: Temospondyli, Stereospondyli, Capitosauridae, phylogeny. CA P I T O S A U R S form a large group of widespread and abundant Triassic temnospondyl amphibians.Their appearance is crocodile-like with a relatively very large skull, a long and¯attened trunk, and a tail of moderate length. Capitosaurs reach lengths of between two and ®ve metres, the European genus Mastodonsaurus being the largest well-known representative. Their remains have been found on every continent, and they form a major component in most Triassic tetrapod assemblages.Although capitosaur phylogeny has never been studied in great detail, there exists a generally accepted concept of a phylogenetic trend from open-notched (capitosaur) to closed-notched (cyclotosaur) forms through the Triassic (Watson 1919(Watson , 1951 Sa Ève-So Èderbergh 1935;Romer 1947; Welles and Cosgriff 1965;Ochev 1966).Capitosaur phylogeny and systematics have long suffered from two major problems: (1) the enormous quantity of fragmentary material of uncertain systematic assignment: and (2) the lack of thorough anatomical studies on representative taxa of the group. The concept of a general phylogenetic trend in capitosaur phylogeny was frequently utilized (among other sources) to correlate horizons of Triassic terrestrial sediments (Watson 1958; Welles and Cosgriff 1965;Ochev 1966; Kamphausen and Morales 1981). Capitosaurs have become a predominant component of such correlations in recent years (Ochev and Shishkin 1989;Shishkin et al. 1995;Hancox et al. 1995).The phylogeny of capitosaurs has only recently been tentatively studied on the basis of phylogenetic systematics (Ingavat and Janvier 1981;Milner 1990Milner , 1993Gubin 1997). A detailed phylogenetic analysis which relies on clear outgroup comparison, explicit character recognition, and a test of congruence is still lacking for capitosaurs in general. This is particular...

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Section: H I S T O R Y O F T H E P R O B L E Mmentioning

confidence: 91%

Section: Ca P I T O S a U R S Form A Large Group Of Widespread And Abmentioning

confidence: 99%

Section: H I S T O R Y O F T H E P R O B L E Mmentioning

confidence: 99%

Section: T H E C a P I T O S A U R I D C O N C E P Tmentioning

confidence: 99%

mentioning

confidence: 99%

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