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A discussion and description of prehistoric fish within an international series Material of six osteolepiform genera is described in Morphology, Phylogeny and Taxonomy of Osteolepiform Fish. This publication is Number 61 within the Fossils and Strata series. The international Fossils and Strata series features monographs in palaeontology and biostratigraphy with taxonomic descriptions. The series is owned by and published on behalf of The Lethaia Foundation in cooperation with the Scandinavian countries.
Autorentext
Ulf J. Borgen is the editor of Morphology, Phylogeny and Taxonomy of Osteolepiform Fish, published by Wiley.
Hans A. Nakrem is the editor of Morphology, Phylogeny and Taxonomy of Osteolepiform Fish, published by Wiley.
Inhalt
Introduction 1
General taxonomy 2
'Crossoptgerygii' and 'Rhipidistia' 2
Osteolepiform subdivisions 3
Terminology 4
Cranial roof 4
Endocranium 13
Dermal bones in mouth roof 13
Lower jaw 14
Operculo-gular bones 15
Upper Palaeozoic fossil locality in the Oslo Region 16
Stratigraphy 16
Descriptions 18
Material, methods and repository 18
Genus Askerichthys n gen 20
Askerichthys heintzi n sp 20
Genus Megalichthys Agassiz, 1835 62
Megalichthys cf M hibberti Agassiz, 1835 62
Megalichthys pygmaeus Tranquair, 1879 97
Megalichthys syndentolaminaris n sp 99
Genus Latvius Jarvik, 1948 100
Latvius grewingki (Gross, 1933) 101
Latvius deckerti Jensen, 1966 114
Latvius sp Jensen, 1966 121
Latvius cf L niger Jensen, 1973 128
Genus Osteolepis Agassiz, 1835 130
Osteolepis macrolepidotus Agassiz, 1835 131
Genus Gyroptychius McCoy, 1848 131
Gyroptychius milleri (Jarvik, 1948) 131
Gyroptychius groenlandicus Jarvik, 1950a 141
Morphologic comparisons and discussions 160
Fronto-ethmoidal shield 160
General shape 160
Interpremaxilla 162
Composition of naso-rostro-premaxillary complex 162
Shape of upper mouth margin 165
Anterior palatal (premaxillary and rostral) teeth and palatal processes 166
Defi nitions and occurrences of morphotypes of anterior palatal teeth 166
Tooth replacement and evolutionary relationship between the anterior palatal dental morphotypes 167
Number of premaxillary teeth 169
Systematic significance of anterior palatal teeth 170
Anterior palatal processes 171
Postrostrals 172
Variation and trends in postrostral pattern 172
Taxonomic significance of postrostral pattern 176
Nasals 178
Number of nasal bones 178
Positions of the bones in the nasal series 178
Circumnarial dermal bones and supraorbitals 180
Variation in eusthenopterids 180
Reconstructing the circumnarial pattern in Osteolepis macrolepidotus 186
Reconstructing the pattern of supraorbitals in Osteolepis macrolepidotus 188
Circumnarial and supraorbital pattern in other Devonian osteolepiforms 189
Homologizations of circumnarial bones in Megalichthys hibberti, Ectosteorhachis, Askerichthys and Cladarosymblema 191
Supraorbito-tectal series of panderichthyids 196
Frontals and dermosphenotics 197
Shape and composition of frontals 197
Shape, positions and extension of dermosphenotic bones 199
Fenestrae 199
Position of nasal fenestra 199
Shape of nasal fenestra 200
Processus dermintermedius 201
Tubercles in nasal fenestra 202
Presence or absence of pineal openings 202
Position of pineal foramen 203
Shape of pineal openings 204
Size of pineal fenestra and presence of pineal plates 204
Sensory canals 204
Pitlines 205
Parietal shield 206
Relative lengths of fronto-ethmoidal and parietal shields 206
Shape of parietal shield 207
Proportions 207
Protruding posterior margin 209
Position of spiracular incision 212
Relative length of the spiracular incision 213
Parietals 214
Shape of parietals 214
Parietal structures 214
Intertemporals 215
Shape of interpemporal 215
Anterior intertemporal margin and process in post-Devonian taxa 216
Anterior intertemporal processes in Devonian forms 222
On the function of the intracranial joint 223
Lateral shelf of intertemporal 223
Ventral surface of intertemporal 224
Supratemporals 228
Shape 228
Ventral surface and lateral margin 228 Spiracular structures 231</p&g...