A revision of Holm's Early and early Mid Cambrian hyoliths Of Sweden

Malinky, John M.; Berg‐Madsen, Vivianne

doi:10.1111/1475-4983.00061

Cited by 42 publications

(29 citation statements)

References 44 publications

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“…G) indicates that the profile was not strongly inflated, as in N. whitei . Nevadotheca socialis (Linnarsson, ) and Nevadotheca tenuistriata (Linnarsson, ) from the middle Cambrian of Sweden, as redescribed by Malinky & Berg‐Madsen () and Berg‐Madsen & Malinky (), have much more slender conchs (incremental angle 9° and 13°, respectively) than N. boerglumensis (20–25°). Opercula assigned to N. tenuistriata by Berg‐Madsen & Malinky (, text‐fig.…”

Section: Hyolithellus Sp Figure T Y–aamentioning

confidence: 99%

The Buen Formation (Cambrian Series 2) biota of North Greenland

Peel

Willman

2018

Papers in Palaeontology

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The diverse metazoan fauna from the upper member of the Buen Formation of North Greenland is described as a complement to published descriptions of the exceptionally preserved fauna of the Sirius Passet Lagerstätte which occurs in the lowest beds of the formation. Considered together with organic‐walled microfossils, which are absent from the Sirius Passet Lagerstätte on account of regional metamorphism, the fauna from the upper member provides an extended picture of the Buen Formation biota (Cambrian, Series 2, Stages 3–4; Montezuman–Dyeran of Laurentian usage). Although dominated numerically by specimens of the olenelline trilobites Limniphacos and Mesolenellus, the oldest assemblages (Montezuma–Dyeran boundary) from the upper member of the Buen Formation are characterized by a high diversity of hyoliths which often occur as partial associations of conch, operculum and helens in the dark mudstones; hyoliths are rare in the Sirius Passet Lagerstätte. Sponges are rare in the upper Buen Formation but diverse at Sirius Passet. Unlike the Sirius Passet Lagerstätte, fossil remains of non‐mineralized metazoans with limbs and other details of internal anatomy do not occur in the upper Buen Formation, although organic tubes assigned to a new selkirkiid stem group priapulid (Sullulika) are common. New taxa: Alutella siku sp. nov., Sullulika broenlundi gen. et sp. nov., Nevadotheca boerglumensis sp. nov., Kalaallitia myliuserichseni gen. et sp. nov., Nasaaraqia hyptiotheciformis gen. et sp. nov., Trapezovitus malinkyi sp. nov., Decoritheca? hageni sp. nov.

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Section: Hyolithellus Sp Figure T Y–aamentioning

confidence: 99%

The Buen Formation (Cambrian Series 2) biota of North Greenland

Peel

Willman

2018

Papers in Palaeontology

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“…There is a superficial resemblance between the spicule rods in L. conicus and the ribs of some early cephalopods and hyoliths (Malinky and Berg‐Madsen 1999), but these have completely mineralized shells. In the Murero Formation, hyolith conchs are either conspicuously three‐dimensional or show cracked walls owing to compaction, a process not present in these sponges.…”

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confidence: 99%

THE DEMOSPONGE GENUS LEPTOMITUS and A NEW SPECIES FROM THE MIDDLE CAMBRIAN OF SPAIN

García‐Bellido¹,

Gutiérrez²,

Martorell³

et al. 2007

Palaeontology

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Forty-five specimens of Leptomitus conicus sp. nov. have been collected from the base of the Murero Formation (Caesaraugustan, Middle Cambrian) in the Murero area of Zaragoza, north-east Spain. The new species is a small obconical sponge, which has coarse oxeas forming parallel rods that run the whole length of the specimens in the manner typical of the genus. The biostratigraphy and facies of the levels with Leptomitus conicus have been analysed. Palaeoecological information derived from associated trilobites, brachiopods and ichnofossils shows that L. conicus lived in a soft substrate of a sublittoral environment of low to low ⁄ moderate energy. According to established Cambrian palaeogeographical reconstructions, a tropical distribution is inferred for the genus Leptomitus. Based on body shape, wall structure and stratigraphical distribution, a phylogenetic tree of the various Leptomitus species is proposed, with a central stock of simple cylindrical sponges branching out to other morphs.

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“…The zones are interpreted as assemblagezones. Other Series 2 taxa that may have correlation potential regionally or intercontinentally include eodiscoid trilobites (Kiaer 1917;Bergström & Ahlberg 1981;Ahlberg 1983Ahlberg , 1984bAhlberg , 1991Ahlberg & Bergström 1993;Axheimer et al 2007;Cederström et al 2009), bradoriids (Dies Á lvarez et al 2008;Streng et al 2008), brachiopods (Kautsky 1945), hyoliths (Malinky & Berg-Madsen 1999) and helcionelloids (Ebbestad et al 2009 (Fig. 9).…”

Section: Scania Swedenmentioning

confidence: 99%

Morphology, ontogeny and distribution of the Cambrian Series 2 ellipsocephalid trilobiteStrenuaeva spinosafrom Scandinavia

Cederström¹,

Ahlberg

Babcock

et al. 2012

GFF

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The ellipsocephalid trilobite Strenuaeva spinosa occurs widely in Scandinavia in the lower part of the Ornamentaspis? linnarssoni Zone (Cambrian Series 2). Its first appearance is a readily recognisable, widespread biohorizon in Scandinavia. During ontogeny, intergenal spines are lost and the librigenae develop from a generative zone in the genal region. The palpebro-ocular ridges are distinct and connected to the posterior part of the frontal glabellar lobe in the early meraspid period, but eye ridges become separate from the palpebral lobes and the glabella in the late meraspid period. S. spinosa is characterised by large genal spines, distinct axial spines and falcate pleural tips. The spines may have functioned in predation resistance. S. spinosa also has a small pointed projection at the anterolateral corners of some thoracic pleurae, the function of which is unknown. The presence of five furrows in the cephalic axial lobe of S. spinosa, best expressed in meraspides, suggests that the head of this ellipsocephalid trilobite was composed of six fused primary segments.

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A revision of Holm's Early and early Mid Cambrian hyoliths Of Sweden

Cited by 42 publications

References 44 publications

The Buen Formation (Cambrian Series 2) biota of North Greenland

The Buen Formation (Cambrian Series 2) biota of North Greenland

THE DEMOSPONGE GENUS LEPTOMITUS and A NEW SPECIES FROM THE MIDDLE CAMBRIAN OF SPAIN

Morphology, ontogeny and distribution of the Cambrian Series 2 ellipsocephalid trilobiteStrenuaeva spinosafrom Scandinavia

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