. Bulletin. Natural history; Natuurlijke historie. 184 PEABODY MUSEUM BULLETIN 42 Huerfanodon torrejonius ⢠^ Conoryctes comma - â¢â X-- ^? ? â ⢠0 Conoryctella patlersoni - ? ^ / â \ ^ N ? // K; V- â ^\ ⢠\ ; / v â. ? \-. .â¢â¢â¢â â â â¢. ^ â¢' ^ ^ ' ^ â >y V / "^^^ C^ p1 p2 p3 p4 1^1 1^2 1^3 ^ p p^ p^ p^ 1^ 1^^ 1^ Stylinodon mirus Ectoganus gliriformis Psittacotherium multifragum Wortmania otariidens. C' pi p= P' M^ M' M' Ci Pi P2 P3 P4 M, M2 M3 Fig. 57. Lengths of the teeth of various taeniodont species plotted as a percentage of the lengths of the corresponding teeth in Onychode
. Bulletin. Natural history; Natuurlijke historie. 184 PEABODY MUSEUM BULLETIN 42 Huerfanodon torrejonius ⢠^ Conoryctes comma - â¢â X-- ^? ? â ⢠0 Conoryctella patlersoni - ? ^ / â \ ^ N ? // K; V- â ^\ ⢠\ ; / v â. ? \-. .â¢â¢â¢â â â â¢. ^ â¢' ^ ^ ' ^ â >y V / "^^^ C^ p1 p2 p3 p4 1^1 1^2 1^3 ^ p p^ p^ p^ 1^ 1^^ 1^ Stylinodon mirus Ectoganus gliriformis Psittacotherium multifragum Wortmania otariidens. C' pi p= P' M^ M' M' Ci Pi P2 P3 P4 M, M2 M3 Fig. 57. Lengths of the teeth of various taeniodont species plotted as a percentage of the lengths of the corresponding teeth in Onychodectes tisonensis. Data upon which these graphs are based are presented in Table 8. appears in some respects more primitive (, lacking a well-developed talonid heel on P4) than Onychodectes and in other respects derived in a different direction and towards the later, more advanced stylinodontids (, in having transversely set premolars, with P, 4 bearing well-developed lingual cingulids). Also, signifi- cantly, Wortmania is the most primitive taeniodont in terms of the development of crown hypsodonty. Whereas Onychodectes has an extremely well-developed crown hypsodonty, in Wortmania this character-state (which is better developed in Psittacotherium and fully developed in Ectoganus and Stylinodon) is seen only in an incipient state. Thus, I suggest that whereas incipient hypsodonty was a character-state of the earliest ancestral taeniodont, it was independently elabo- rated upon in the conoryctids and stylinodontids. It is also interesting that where- as Wortmania is a much larger and more robust animal overall as compared to Onychodectes (cf. Tables 10-21), it does not intuitively seem that an animal of the size and proportions of Onychodectes would have given rise to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustra
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