Abstract Sir Arthur Smith Woodward published many scientific works on fossil fishes from Brazil, among them the description of 14 new species and the redefinition of two lectotypes. This paper provides an illustrated, taxonomic update on the following taxa, together with comments on their repository and other relevant remarks: Lissodus nitidus ( Woodward, 1888 ), Rhinoptera prisca Woodward, 1907 , ‘ Lepidotes ’ mawsoni Woodward, 1888 , ‘ Lepidotes ’ souzai Woodward, 1908 a , Calamopleurus mawsoni ( Woodward, 1902 ), ‘ Belonostomus ’ carinatus Mawson & Woodward, 1907 , Paleopiquitinga brasiliensis ( Woodward, 1939 ), Lignobrycon ligniticus ( Woodward, 1898 ), Brycon avus ( Woodward, 1898 ), Steindachneridion iheringi ( Woodward, 1898 ), Scombroclupeoides scutata ( Woodward, 1908 a ), Macracara prisca Woodward, 1939 , Mawsonia gigas Woodward, 1907 , Mawsonia minor Woodward, 1908 a ; Vinctifer comptoni ( Agassiz, 1841 ) and Notelops brama ( Agassiz, 1841 ).

Abstract The monotypic scombrid fish Micrornatus is represented by a single skull from the early Eocene (Ypresian) London Clay Formation of southeastern England. Although Arthur Smith Woodward substantially increased the diversity of scombrids and scombrid-like taxa known from this deposit, he seems not to have studied the fossil that would later be recognized as Micrornatus . Here we re-examine this specimen using computed microtomography, with two principal aims: first, a revised anatomical account with an emphasis on concealed features; and, second, ‘proof-of-concept’ for the tomographic study of fish crania from the London Clay. Scans reveal new details of the braincase, suspensorium and ventral hyoid arch. We compare the cranial anatomy of Micrornatus with other members of Eocoelopomini, a group also containing the genera Eocoelopoma , Palaeothunnus and possibly Landanichthys . Clarification of the taxonomy and phylogeny of early fossil scombrids is needed, and we suggest that computed tomography will be a useful tool for revealing the anatomical evidence needed to accomplish this goal. Supplementary material: Micrornatus hopwoodi NHMUK PV OR 36136 PLY files are available at: http://doi.org/10.6084/m9.figshare.1561381

Abstract Although a diverse range of aquatic vertebrates are documented from the Upper Cretaceous (mid-Campanian) marine strata of the Kristianstad Basin in southern Sweden, only chondrichthyans and marine amniotes have been described in detail to date. In contrast, coeval actinopterygians are virtually unreported, yet their remains are extremely abundant at most sampled localities. A comprehensive assessment of these fossils has identified the first Late Cretaceous actinopterygian fauna from the Fennoscandian Shield, incorporating indeterminate lepisosteids, the durophagous pycnodontid Anomoeodus subclavatus , the predatory pachycormid Protosphyraena sp., a large ichthyodectid, pachyrhizodontids resembling Pachyrhizodus , the enchodontid Enchodus cf. gladiolus and indeterminate small teleosts. These taxa are diagnosed mainly from isolated teeth and scales, implying substantial taphonomic loss prior to burial. Moreover, the prolific recovery of actinopterygian skeletal remnants in recent excavations suggests that historical collecting biases, rather than ecological paucity, have contributed to their under-representation in the Swedish Cretaceous record. Palaeobiogeographically, the Kristianstad Basin actinopterygians show compositional resemblance to assemblages from the Northern European Platform and the Western Interior Seaway of North America, advocating distributional communication across the Boreal proto-Atlantic Ocean.