Annals of the South African Museum, Volume 89The Museum, 1982 - Natural history |
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Page 195
... external cochlear foramen and by a posteriorly exposed petrosal . These struc- tures otherwise offer little resistance to high pressure and Monachus is , in fact , a littoral species and a shallow diver . Except for some individual ...
... external cochlear foramen and by a posteriorly exposed petrosal . These struc- tures otherwise offer little resistance to high pressure and Monachus is , in fact , a littoral species and a shallow diver . Except for some individual ...
Page 196
... external cochlear foramen tends to disappear and the bulla very often covers the petrosal posteriorly . These two features are never as well marked and constant as in the Lobodon- tini and a mastoid lip is not present . Erignathus ...
... external cochlear foramen tends to disappear and the bulla very often covers the petrosal posteriorly . These two features are never as well marked and constant as in the Lobodon- tini and a mastoid lip is not present . Erignathus ...
Page 199
... external cochlear foramen . It is represented by one living genus ( Mirounga ) and one fossil genus ( Callophoca ) . Palaeophoca nystii van Beneden , 1859 , was based on a cetacean tooth and therefore cannot be a phocid ( Ray 1976b ) ...
... external cochlear foramen . It is represented by one living genus ( Mirounga ) and one fossil genus ( Callophoca ) . Palaeophoca nystii van Beneden , 1859 , was based on a cetacean tooth and therefore cannot be a phocid ( Ray 1976b ) ...
Contents
Family Otarionidae | 14 |
Family Dalmanitidae | 45 |
Genus Gamonedaspis | 54 |
Copyright | |
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2p furrows 9 fig abaxially Acropyga adaxial Anoplolepis anteriorly apodemal pits distally apomorphic arbuteus Lake axial furrows axial rings axis Bainella baini Baldis bulla Burmeisteria herscheli Murchison Calmonia cephalon Clarke Cryphaeus custodiens Dalmanites deep Devonian distinct Douvilleiceras Eldredge & BraniĊĦa exsag external cochlear foramen eyes facial suture fauna Francovichia frontal lobe gamkaensis Gamonedaspis genal angles genera genus geol glabella Histriophoca holotype Homalonotus internal moulds Kozlowski Kozlowskiaspis L1 lobes lateral view lectotype Lobodontini Malvinokaffric margin material median Metacryphaeus Mirounga Miroungini moderately convex monachines Monachus Monotherium Muizon narrow occipital furrow occipital ring ocellus Oosthuizenella Oxytropidoceras Pennaia petrosal Phacopina Phacops Phoca phocids pleural fields pleural grooves post-axial posterior border furrows Potamotherium preserved as internal pugnacious pygidial pygidium Reed Rennie Renniella ribs ring furrows sagittal length Schwarz seals segmentation Semantor semantorids slightly South African Museum specimens strongly subfamily suckers synapomorphy thorax transverse trilobites tubercles Typhloniscus ventral weakly width Wolfart