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FOSSILS and STRATA 18 (1985) Silurian Oncocerid Cephalopods Fr Om Gotland 5

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FOSSILS and STRATA 18 (1985) Silurian Oncocerid Cephalopods Fr Om Gotland 5 FOSSILS AND STRATA Editor science without national limitations or preferences. Fossils and Strata, howeve r, is an outlet fo r more comprehensive systematic and regional Stefan Bengtson, Institute of Palaeontology, Box 558, descriptions dealing with areas in the five countries of Norden, or S-751 22 Uppsala, Sweden. writ ten by palaeontologists and stratigraphers from these countries. Contributions by colleagues in other countries may also be included as Editorial and administrative board far as this series is deemed to be the appropriate medium with regard to distribution and availability. Articles can normally be accepted only if Stefan Bengtson (Uppsala), Fredrik Bockelie (Bergen), and they are heavily subsidized by the national Research Council in their country of origin or by other fu nds. All income is re-invested in Valdemar Poulsen (Copenhagen). fo rthcoming numbers of the series. Manuscripts intended fo r typographical composition should con­ Publisher fo rm with the Instructions on page 3 0fthis cover, which are essentially the same as fo r Boreas and Lethaia. Manuscripts to be printed from Universitetsforlaget, Postboks 2959, Tøyen, Oslo 6, Norway. camera-ready typescript are also accepted but necessitate contacts with the editor at the ear!iest stage of manuscript planning. Articles in English, German, and French are accepted; the use of the Fossils and Strata is an internationally distributed series ofmonographs English language is preferred. A card abstraet in English should always and memoirs in palaeontology and stratigraphy. It is issued in Numbers be provided, and non-English artic!es should always be provided with with individual pagination, listed cumulatively on the back of each English versions of the figure captions. Abstracts or summaries in one cover; the arrangement of the numbers in volumes fo r binding is left to or more additional languages may be added. the individual subscriber's discretion. Many regional or systematic descriptions and revisions contain a nucleus of results which are of immediate and general interest in Fossils and Strata fo rms part of the same structured publishing international palaeontology and stratigraphy. It is expected that programme as thejournals Boreas and Lethaia. These twojournals are authors of such papers will to some ex tent duplicate their publication fu lly international and accept papers within their respective sectors of in the fo rm of an artic!e fo r ajournal, in the first place Lethaia or Boreas. An International Journal of niques, met ho dolog y and sta nda rds in scie nt ifi c publicat ion. These LETHALA Palaeontology and Stratigraphy jo urnals are se mi-specialize d, inte nding to co ve r an d provide info r­ mation within the re spe ct ive inte rest range s of la rge groups of ea rt h scientists. They do not duplicat e the functions of exta nt, strictly � specialized journals in their fid d, nat io na l se rie s, or mono graph and memQl r sen es. Editor SUBSCRIPTION TO LETHAIA 1984 Anita Liifgren, Department of Historical Geology and Palae­ ontology, Siilvegatan 13, S-223 62 Lund, Sweden. Ordinary price (non-members of IPA, institutions, libraries, etc.): NOK 440,00 (USD 73 00 1984) Lethaia publishes artic!e s of int ernat io na l interest in the fi elds of palaeontology and strat igraphy. Artic! es on the mo rp ho lo gy and anatomy of fo ssil plantsan d animals should be of general interest to DISCOUNT ON LETHAIA AN D MEMBERSHIP palaeontologists, and artic! es on systema tic pa la eo nto logy should FOR 1985 IN THE INTERNATI ONA L deal with the highcr units in syste mat ics.or key fo rms on which our PALAEONT OLOGICAL ASSOCIATION concepts of c! assification are ba sed. New feat ures, ne w fo rms and significant changes in the known distributionof fo ssil orga nisms also Subscribing membership fo r individual palaeontologists in the Inter­ const it ute important criteria fo r the accepta nce of artic!e s. Pa laeo­ national Palaeontological Association (IPA, affi liated to the biology - pa rticularly pa laco ecology - and ecost rat igraphy are the International Union of Geological Sciences, IUGS) may be ' core topics of the journal. Artic!c s on st rat igraphy should mect the o btained by payment of USD 42.00 to Unive rsitet sfo rlaget, Box same requirementsfo r general interest as the pa la conto logicalar tic­ 2959, Tø yen, Oslo 6, Norway. The applicant must sign a les and deal with st ratigraphic principles, corrc lat ions of at lea st statement that he undertakes to retain his discount copy of Lethaia continent-wide importance, stratot ype area s of key cha ra cter, ne w as a personal copy and not deposit it in a public or institutional occurrence s or re visio ns which esta blish majo r feat ures in pa la eo ­ library. gc ography, etc. Lethaia, like its siste r jo urna l Boreas, fo rms pa rt of a publishing Back volumes (1-17, 1968- 1 984) ma y be orde re d on the same system with special ambit io ns to app ly and de vc10p mo dern te ch- conditions. " Silurian oncocerid cephalopods from Gotland SVEN STRIDSBERG Stridsberg, S. 1985 05 09: Silurian oncocerid cephalopods from Gotland. Fossils and Strata, No. 18, pp. 1-65. Oslo ISSN 0300-9491. ISBN 82-00-07575-3. Two new genera, Jeppssonoceras and Plemeroeeras, eight new speeies, Trimeroeeras bulbosum, Pentameroceras fa cula, Clathroceras plieatum, Jeppssonoeeras concentratum, Plemeroeeras cassis, Oetamero­ ceras sinuosum, O. pugil and O. unguifer, and fo ur old speeies of oncocerids are described from IU S Gotland. Comparative studies are made on material from Czechoslovakia, Great Britain, UNES O Estonia and the United States. Immature and mature growth stages are diseussed. Growth patterns in the apertural area support the interpretation that the number of sinuses does not necessarily reflect any specific genus, or speeies. Sexual dimorphism based on size and shape of shell is demonstrated in six speeies. Truncation seems to occur in three speeies. Floating Project Ecostratigraphy conditions and swimming abilities are diseussed as well as colour patterns. Comparisons are made with the extant Nautilus and Sp irula. Malformation and bore hoies in shell are described. Sven Stridsberg, Geologiska Institutionen, Solvegatan 13, S-223 62 Lund, Sweden; 22nd January, 1985. Contents Introduction ..... ................... ................... 3 Family Trimeroceratidae Hyatt 1900 . .. 30 Acknowledgements . 3 Genus Tr imeroeeras Hyatt 1884 . .. 30 Historical review . 3 Trimeroceras cylindrieum (Barrande 1865) n. comb. .. 30 Geology of the area . 4 Trimeroceras bulbosum n. sp. .. 34 Localities ........................................ .... 4 Ge nus Pentameroceras Hyatt 1884 . .. 37 Material and methods .................................. 8 Pentameroceras mirum (Barrande 1865) . ... ... 37 Photography . 9 Pentameroceras fa cula n. sp. .. 40 Shell orientation ..................................... 9 Genus Inversoceras Hedstr6m 1917 . .. 42 Measuring methods ............. ..................... 10 Inversoceras perversum (Barrande 1865) . .. .. 42 Deposition and preservation ofshell ...................... 10 Genus Clathroeeras Foerste 1926 . .. 45 Apertural growth ...................................... I1 Clathroceras plieatum n. sp. .. 45 Dimorphism . .. 12 Genus Jeppssonoeeras n. gen ..."........................ 48 Truncation . .. 15 Jeppssonoceras concentratum n. sp. ................. 48 Malformation, regeneration and parasitism . .. 18 Genus Plemeroceras n. gen. .. 49 Epifauna . .. 21 Plemeroceras eassis n. sp. .. 49 Colour pattern . .. 23 Family Hemiphragmoceratidae Foerste 1926 ............... 51 Palaeoecology . .. 24 Genus Octameroceras Hyatt 1900 . .. 51 Aperture . .. 24 Octameroceras sinuosum n. sp. ......... .. 53 Buoyancy . .. 25 Octameroceras pugil n. sp. .. 56 Swimming .......................................... 27 Octameroceras rimosum (Barrande 1865) ........... 57 Classification . .. 28 Oetameroceras unguifer n. sp. .. 59 Taxonomic descriptions . .. 30 Summary . .. .. 61 Class Cephalopoda Cuvier 1797 . .. 30 Appendix: Locality list . • . .. 62 Subclass Nautiloidea Agassiz 1847. .. 30 Referenees ............................................ 63 Order Oncocerida Flower 1950 . 30 Introduction Apart fr om extensive publications by Barrande in the 19th from Gotland (PSSFG) provided unique silicili ed material. For this century and later discussions by Hyatt, Foerste, Flower and I am very grateful. For stimulating guidanee in the lield in Bohemia and great help during my examinations of the Barrandian collec­ Teichert, very little work has been carried out on Silurian tions in Narodni Muzeum, Prague, I would like to express my brevicone cephalopods. A reason fo r this state of affairs is thanks to Vojtech Turek. For help during visits to museums, sincere probably the rarity of brevicone fo ssils. The limited number thanks also go to Adrian Rushton on the British Geological Survey, ofknown specimens of brevicones has not given palaeontolo­ London, H. Owen at the British Museum of Natural History, gists the opportunity to com pare material from different London, Sven Laufeld and Anders Oamberg at Sveriges Geologiska Undersiikning, Uppsala, Hermann Jaeger at Museum flir Natur­ places and thus many species are known only from one kunde, Berlin, and Or. Jauch at Wilhelma Aquarium in Stuttgart. specimen. With the exception of some American species, Oesmond H. Collins at the Royal Ontario Museum of Palaeonto­ most specimens discussed hitherto originate fr om the Bar­ logy provided material for which I am very thankful.
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