The succession of Belemnopsis in the late Jurassic of eastern Indonesia
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Probably all the late Jurassic species of Belemnopsis from eastern Indonesia form part of the moluccana lineage which ranged from early Oxfordian to top Tithonian. B. moluccana, B. galoi and B. stolleyi appear in that order and form the main lineage, while B. alfurica and B. mangolensis represent impersistent branches with no descendants. Other previously recognized taxa are either synonyms, transitional forms or group names. Important morphological changes in the moluccana lineage include a decrease in guard length, forward movement of the point of maximum inflation and a decrease in dorso-ventral flattening. Stratigraphic distribution is established in the Misool Archipelago and Sula Islands and the relative Stratigraphic position of many specimens or species described by earlier workers is inferred.
Palaeontology - Volume 32 Part 3 Pages 571-596Palaeontology - Volume 32 Part 3 Pages 571-596
Citations
CHALLINOR, A. B. 1989. The succession of Belemnopsis in the late Jurassic of eastern Indonesia. Palaeontology, 32, 3, 571–596.