Unusual brachiopod fauna from the Middle Triassic algal meadows of Mt. Svilaja (Outer Dinarides, Croatia)

2015 ◽  
Vol 89 (4) ◽  
pp. 553-575 ◽  
Author(s):  
Adam T. Halamski ◽  
Maria Aleksandra Bitner ◽  
Andrzej Kaim ◽  
Tea Kolar-Jurkovšek ◽  
Bogdan Jurkovšek
Keyword(s):  
New Species ◽  
Middle Triassic ◽  
Southern Alps ◽  
Evolutionary Line ◽  
Low Diversity ◽  
Brachiopod Fauna

AbstractLadinian deposits at Mt. Svilaja in Dalmatia (Outer Dinarides, Croatia) yielded an abundant brachiopod fauna of low diversity interpreted as a parautochthonous assemblage representing an ecosystem of dasycladacean submarine meadow. The fauna consists of four named species and one left in open nomenclature. The most common is the spiriferinideFlabellocyrtia flabellulumChorowicz and Termier, 1975 (Spiriferinida) accounting for more than 70% of the material. The athyridideCassianospira humboldtii(von Klipstein, 1845) is the only species known from elsewhere (Anisian of Southern Alps). The new species of SpiriferinidaThecocyrtella dagysiiHalamski, Bitner, Kaim, Kolar-Jurkovšek, and Jurkovšek n. sp. differs from other representatives of the genus in having a deep ventral sulcus.Albasphe albertimagniHalamski, Bitner, Kaim, Kolar-Jurkovšek, and Jurkovšek n. gen. n. sp. is a new brachiopod that possesses a dorsal septum with an intra-septal cavity and dorsal submarginal ridges, both features in common with AalenianZellaniaMoore, 1855 from which it differs in lack of the ventral septum and of ventral submarginal ridges. They are interpreted as members of a sparsely recorded paedomorphic evolutionary line of terebratulides with secondarily lost loop, described formally herein as Gwyniidina Halamski and Bitner n. subordo and subdivided into newly emended Dispheniidae Grant, 1988 (Dispheniinae Grant, 1988 with the only genusDispheniaand Albasphinae Halamski and Bitner n. subfam. withAlbaspheandZellania) and Gwyniidae MacKinnon, 2006 (including RecentGwyniaandSimpliciforma). In contrast to previous interpretations, the trocholophe lophophore ofGwyniais interpreted herein as secondarily simplified.

Magnigondolella, a new conodont genus from the Triassic of North America

2017 ◽  
Vol 92 (2) ◽  
pp. 207-220 ◽  
Author(s):  
Martyn L. Golding ◽  
Michael J. Orchard
Keyword(s):  
British Columbia ◽  
New Species ◽  
North America ◽  
New Genus ◽  
Middle Triassic ◽  
Regional Scale ◽  
Biostratigraphic Correlation ◽  
Low Diversity ◽  
The Usa ◽  
Stratigraphic Ranges

AbstractThe new conodont genusMagnigondolellais recognized based on specimens recovered from the Anisian (Middle Triassic) of British Columbia in Canada, and Nevada in the USA. This new genus encompasses problematic specimens with high carinas, which have recently been collectively referred to asNeogondolellaex gr.regalisMosher. Ten species from North America are herein assigned toMagnigondolellan. gen., including the eight new speciesM.alexanderi,M.cyri,M.julii,M.nebuchadnezzari,M.salomae,M. n. sp. A,M. n. sp. B, andM. n. sp. C, as well as the two existing speciesM.regalis(Mosher) andM.dilacerata(Golding and Orchard). Other species from the Tethys region are also tentatively assigned toMagnigondolellan. gen. Based on published records, the genus appears to range from the Spathian to the upper Anisian in North America. The recognition of eight new species from the Anisian significantly increases the conodont biodiversity of this period, which has previously been regarded as a time of low diversity. Although some of the species included withinMagnigondolellan. sp. have relatively long stratigraphic ranges, many have been identified in both British Columbia and Nevada, and therefore show potential for biostratigraphic correlation on a regional scale.

Spatangoid echinoids from the Eocene of Jamaica

2000 ◽  
Vol 74 (4) ◽  
pp. 654-661 ◽  
Author(s):  
Stephen K. Donovan ◽  
Deborah-Ann C. Rowe
Keyword(s):  
New Species ◽  
First Record ◽  
Trace Fossils ◽  
Upper Eocene ◽  
Area Effects ◽  
Low Diversity ◽  
First Time ◽  
Incomplete Sampling

Paleocene spatangoids are unknown from the Antilles, apart from evidence from trace fossils. The peak of spatangoid diversity was the Eocene. Jamaican Oligo-Miocene spatangoids have a relatively low diversity compared with that of the Antillean region. Plio-Pleistocene spatangoids are poorly known from the Antilles (four genera), in contrast to the Oligo-Miocene (16 genera) and Holocene (17 genera). The depauperate Paleocene and Plio-Pleistocene spatangoid faunas are probably in part artifacts of incomplete sampling, facies-related absences, outcrop area effects and the relative brevity of these stratigraphic intervals.To the large echinoid fauna of the Swanswick Formation (Middle-Upper Eocene) of Jamaica is added the schizasterid Aguayoaster schickleri new species. This is the first record of this genus outside Cuba; it is distinctly more elongate than all other known specimens of this genus. The schizasterid Caribbaster loveni (Cotteau, 1875) is recorded from the Swanswick Formation for the first time, the youngest occurrence of this genus in Jamaica. The coeval Claremont Formation has not previously yielded spatangoid echinoids; the brissid Eupatagus cf. antillarum (Cotteau) from a new locality is the first spatangoid known from a lagoonal unit of the White Limestone Group.

The anisian (middle triassic) carbonate bank of Camorelli (Lombardy, Southern Alps)

Facies ◽  
1989 ◽  
Vol 21 (1) ◽  
pp. 41-56 ◽  
Author(s):  
Maurizio Gaetani ◽  
Marta Gorza
Keyword(s):  
Middle Triassic ◽  
Southern Alps ◽  
Carbonate Bank

Helmolepis cyphognathus, sp. nov., a new platysiagid actinopterygian from the Lower Triassic Sulphur Mountain Formation (British Columbia, Canada)

2005 ◽  
Vol 42 (1) ◽  
pp. 25-36 ◽  
Author(s):  
Andrew G Neuman ◽  
Raoul J Mutter
Keyword(s):  
British Columbia ◽  
New Species ◽  
Central Europe ◽  
Middle Triassic ◽  
Lower Triassic ◽  
Western Canada ◽  
Early Triassic ◽  
East Greenland ◽  
The Family ◽  
A New Species

A new species of stem actinopterygian, Helmolepis cyphognatus sp. nov., is reported from the Lower Triassic Sulphur Mountain Formation of western Canada (probably Smithian). This taxon differs from the only other known Early Triassic platysiagid, H. gracilis from the Lower Triassic Wordie Creek Formation of East Greenland (Griesbachian), in counts of branchiostegal rays, shape of the maxilla, shape (and possibly counts) of extrascapulars, and the size ratio of major opercular bones. In spite of their overall unfavorable preservation, the numerous available specimens amend our knowledge of the little known genus Helmolepis considerably: it has become evident that the morphology of Helmolepis cyphognatus sp. nov. comes closest to Platysiagum minus (Middle Triassic Besano Formation of central Europe). This study suggests placement of the two genera in the family Platysiagidae. Investigation of this new species also shows certain features of the cheek and the caudal fin are more primitive than previously believed, whereas the snout region is probably derived but of yet uncertain affinities in Helmolepis.

scholarly journals A new millipede (Diplopoda, Helminthomorpha) from the Middle Triassic Luoping biota of Yunnan, Southwest China

2018 ◽  
Vol 92 (3) ◽  
pp. 478-487
Author(s):  
Jinyuan Huang ◽  
Joseph T. Hannibal ◽  
Rodney M. Feldmann ◽  
Qiyue Zhang ◽  
Shixue Hu ◽  
...  
Keyword(s):  
New Species ◽  
New Genus ◽  
Southwest China ◽  
Middle Triassic ◽  
Body Segments ◽  
Near Shore

AbstractA new helminthomorph millipede,Sinosoma luopingensenew genus new species, from the Triassic Luoping biota of China, has 39 body segments, metazonites with lateral swellings that bear a pair of posterolateral pits (?insertion pits for spine bases), and sternites that are unfused to the pleurotergites. This millipede shares a number of characters with nematophoran diplopods, but lacks the prominent dorsal suture characteristic of that order. Other “millipede” material from the biota is more problematic. Millipedes are a rare part of the Luoping biota, which is composed mainly of marine and near-shore organisms. Occurrences of fossil millipedes are exceedingly rare in Triassic rocks worldwide, comprising specimens from Europe, Asia, and Africa, and consisting of juliform millipedes and millipedes that are either nematophorans or forms very similar to nematophorans.

Freboldia carinii sp. nov. from the Middle Triassic Brembana Valley (Esino Limestone, Southern Alps, Italy) – possibly the oldest known holoplanktonic gastropod

2020 ◽  
Vol 298 (1) ◽  
pp. 9-15
Author(s):  
Vittorio Pieroni ◽  
Alexander Nützel
Keyword(s):  
Life Style ◽  
Thin Shell ◽  
Type Species ◽  
Middle Triassic ◽  
Canadian Arctic ◽  
Southern Alps ◽  
Early Jurassic ◽  
Ellesmere Island ◽  
Gastropod Species ◽  
Mass Occurrence

A monospecific mass occurrence of the new gastropod species Freboldia carinii sp. nov. is described from the Middle Triassic Esino Limestone of the Brembana Valley, Southern Alps, Italy. It is the second species assigned to the genus Freboldia that was initially described from the Early Jurassic of Ellesmere Island, Canadian Arctic. This gastropod is unusual in being planispiral and inflated with a nearly bilateral symmetrical shape and in having a very thin shell. Like the Canadian type species of Freboldia, the new Triassic species is interpreted as a possibly holoplanktonic gastropod. If true, it would be the oldest known example of this life style in Gastropoda.

Cambrian and Ordovician linguliform brachiopods from the Shallow Bay Formation (Cow Head Group), western Newfoundland

2001 ◽  
Vol 75 (2) ◽  
pp. 241-260 ◽  
Author(s):  
Sean P. Robson ◽  
Brian R. Pratt
Keyword(s):  
New Species ◽  
Continental Slope ◽  
Head Group ◽  
Lower Paleozoic ◽  
Middle Cambrian ◽  
Middle Ordovician ◽  
Upper Cambrian ◽  
Three New Species ◽  
Brachiopod Fauna ◽  
Shallow Bay

Linguliform brachiopods were recovered from the Upper Cambrian Downes Point Member (lower Sunwaptan) and from the Middle Ordovician Factory Cove Member (Arenig) of the Shallow Bay Formation, Cow Head Group, of western Newfoundland. These rocks are a series of Middle Cambrian to Middle Ordovician conglomerates, lime mudstones, and shales that formed a sediment apron at the base of the lower Paleozoic continental slope of Laurentia. The linguliform brachiopod fauna consists of sixteen species assigned to twelve genera. Three new species are described: Picnotreta lophocracenta, Neotreta humberensis, and Siphonotretella parvaducta.

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