Gill structure and relationships of the Triassic cycloid crustaceans

Dzik, Jerzy

doi:10.1002/jmor.10663

Cited by 32 publications

(20 citation statements)

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“…Vertebrates are represented by a second temnospondyl, Cyclotosaurus intermedius Sulej & Majer, 2005, a phytosaur ( Palaeorhinus ; see Dzik, 2001), the typical terrestrial tetrapod aetosaur Stagonolepis olenkae Sulej, 2010, pterosaurs (Dzik & Sulej, 2007), sphenodonts and other small tetrapods (Dzik & Sulej, 2007), as well as fishes (dipnoans described recently by (Skrzycki, 2015), and various actinopterygian and chondrichthyan species). Invertebrates, such as unionid bivalves (Dzik et al, 2000; Skawina & Dzik, 2011; Skawina, 2013), cycloids (Dzik, 2008), spinicaudatan crustaceans (Olempska, 2004), fresh-water ostracods (Olempska, 2004; Olempska, 2011), and some gastropods are also very common. The upper horizon is restricted to lenses cemented with calcium carbonate, interpreted as a meander deposit (e.g., Gruszka & Zieliński, 2008).…”

Section: Methodsmentioning

confidence: 99%

Cranial bone histology ofMetoposaurus krasiejowensis(Amphibia, Temnospondyli) from the Late Triassic of Poland

Gruntmejer

Konietzko-Meier

Bodzioch

2016

PeerJ

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In this study, 21 skull bones of Metoposaurus krasiejowensis from the Late Triassic of Poland were investigated histologically. Dermal bones show a diploë structure, with an ornamented external surface. The ridges consist of mostly well vascularized parallel-fibered bone; the valleys are built of an avascular layer of lamellar bone. The thick middle region consists of cancellous bone, with varying porosity. The thin and less vascularized internal cortex consists of parallel-fibered bone. The numerous Sharpey’s fibers and ISF are present in all bones. The cyclicity of growth is manifested as an alternation of thick, avascular annuli and high vascularized zones as well as a sequence of resting lines. The detailed histological framework of dermal bones varies even within a single bone; this seems to be related to the local biomechanical loading of the particular part of the skull. The dynamic processes observed during the ornamentation creation indicate that the positions of the ridges and grooves change during growth and could be a specific adaptation to changing biomechanical conditions and stress distribution during bone development. In the supratemporal, the cementing lines show that the remodeling process could be involved in the creations of sculpture. The common occurrence of ISF suggests that metaplastic ossification plays an important role during cranial development. Endochondral bones preserved the numerous remains of calcified cartilage. This indicates that ossification follows a pattern known for stereospondyl intercentra, with relatively slow ossification of the trabecular part and late development of the periosteal cortex. The large accumulation of Sharpey’s fibers in the occipital condyles indicates the presence of strong muscles and ligaments connecting the skull to the vertebral column.

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Section: Methodsmentioning

confidence: 99%

Cranial bone histology ofMetoposaurus krasiejowensis(Amphibia, Temnospondyli) from the Late Triassic of Poland

Gruntmejer

Konietzko-Meier

Bodzioch

2016

PeerJ

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“…This discovery extends to East Asia in geographic range of cyclids, whose previous records were limited in Austria, Belgium, Bosnia, Central Asia, France, Germany, Ireland, Italy, Madagascar, Netherlands Poland, Russia, the U. K. and the U. S. A. (Glaessner, 1969;Schram et al, 1997;Fraaije et al, 2003;Dzik, 2008).…”

Section: Introductionmentioning

confidence: 67%

“…Previously it has been thought that the earliest known representatives of the group were endemic in Euramerica, and they exhibit distinct provincialism consisting of the eastern fauna typified by Schramine in Montana, North America and the western one typified by Cyclus in England, Ireland and Belgium (Goldring, 1967;Schram et al, 2005;Dzik, 2008) (see Fig. 3).…”

Section: Discussionmentioning

confidence: 99%

“…Since Phillips (1835), who placed cyclids to agnostid trilobites, many different views have been proposed for their higher taxonomic placement. Although they are exclusively interpreted as the class Maxillopoda in recent workers, three different subclasses for their assignment are advocated, namely Branchiura (Dzik, 2008), Copepoda (Clark, 1989), and Halicyna (Gall and Grauvogel, 1967;Schram et al, 1997). Herein, we document the occurrence of a new species of a cyclid from central Japan.…”

Section: Introductionmentioning

confidence: 88%

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First cyclid crustacean from East Asia

Niko

Ibaraki

2011

Jour. Geol. Soc. Japan

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“…Even though the ventral appendages of cycloids are poorly preserved, what is known about them is that they have fewer appendages, with fewer podomeres, than the fossil described here, no well-developed anterior grasping appendage. A single, large carapace is always visible (Dzik, 2008). Further investigation proved that the animals from Friuli are isopod crustaceans.…”

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confidence: 94%

First fossil asellote (Isopoda: Asellota), from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy)

Selden

Wilson

Simonetto

et al. 2016

Journal of Crustacean Biology

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A B S T R A C TThe first asellote isopod from the fossil record is described here as Fornicaris calligarisi Wilson and Selden, n. gen. and sp. The two specimens, both probably males, showing dorsal morphology, come from loose material of the Dolomia di Forni Formation in the bed of the Tagliamento River below the town of Forni di Sotto, Udine Province, Friuli Venezia Giulia Autonomous Region, northeastern Italy. The Dolomia di Forni Formation is Triassic (Norian) in age, and the fossils date from approximately 210-215 Ma. Characters such as narrow, elongate eye stalks, tiny uropods, and enlarged first pereionite (found in terminal males) place the fossil within the Paramunnidae. Parsimony analysis using TNT placed the fossil within the Austrosignum-Munnogonium species complex. The robust pereiopods with hooked tips, elongate and robust carpus and propodus of pereiopod I, axial compression of the pereion, and the large size of the fossils (>2× related extant taxa) are features particular to the fossil genus and species.KEY WORDS: Dolomia di Forni Formation, Janiroidea, Paramunnidae DOI: 10.1163/1937240X-00002387 INTRODUCTIONIsopods are common inhabitants of marine, freshwater, and humid terrestrial environments, but not plentiful as fossils. In particular, while fossil isopods are known from numerous suborders (Hessler, 1969;Etter, 2014;Jones et al., 2014;Klompmaker et al., 2014;Broly et al., 2015), until now, no members of the large and diverse suborder Asellota, comprising marine and freshwater forms, have been described from the fossil record. Here, we describe a new genus and species of asellote isopod based on two specimens from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy).A cursory examination of these specimens suggested they showed ventral views of the cycloid Halicyne von Meyer, 1844, which is not uncommon in the Triassic of Europe (von Meyer, 1847;Trümpi, 1957;Merki, 1961; Gall and Grauvogel, 1967;Gall, 1971). Even though the ventral appendages of cycloids are poorly preserved, what is known about them is that they have fewer appendages, with fewer podomeres, than the fossil described here, no well-developed anterior grasping appendage. A single, large carapace is always visible (Dzik, 2008). Further investigation proved that the animals from Friuli are isopod crustaceans.Although isopods appear frequently among Mesozoic strata (Etter, 2014), some groups apparently do not fossilize * Corresponding author; e-mail: paulselden@mac.com well and have been slow to be reported in the literature. The terrestrial isopods described prior to Broly et al. (2015) were known only from Cenozoic facies, although Lins et al. (2012), using molecular dating techniques on modern taxa, asserted that the Oniscidea and other isopod suborders appeared prior to the Mesozoic, perhaps as early as Carboniferous or Late Devonian. The suborder Asellota may fossilize poorly, owing to their thin cuticle, and were currently unreported in the fossil literature, despite Lins et al. (2012) estimating the...

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Gill structure and relationships of the Triassic cycloid crustaceans

Cited by 32 publications

References 32 publications

Cranial bone histology ofMetoposaurus krasiejowensis(Amphibia, Temnospondyli) from the Late Triassic of Poland

Cranial bone histology ofMetoposaurus krasiejowensis(Amphibia, Temnospondyli) from the Late Triassic of Poland

First cyclid crustacean from East Asia

First fossil asellote (Isopoda: Asellota), from the Upper Triassic (Norian) of the Carnic Prealps (Friuli, northeastern Italy)

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