The Fortunian (lowermost Cambrian) Qinscyphus necopinus (Cnidaria, Scyphozoa, Coronatae) underwent direct development

Shao, Tiequan; Liu, Yunhuan; Duan, Baichuan; Zhang, Huaqiao; Zhang, Hu; Qi, Wang; Zhang, Yanan; Qin, Jianchun

doi:10.1127/njgpa/2018/0755

Cited by 11 publications

(14 citation statements)

References 20 publications

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“…The morphological variation along the tube (uniseriate proximal region with rings grading to quadriseriate distal region with plates), a bilayered wall with regular and inverse imbrication mode of the sclerites in each layer, a multi-element articulated imbricated skeleton, and an alternation of independent, articulated plates along the midlines (articulation axes) is not consistent with a cnidarian affinity. Staurozoans, cubozoans, and living scyphozoans are unmineralized 50 (including Cambrian taxa 51 ). Although Corumbella shares an aragonitic composition with hydrozoans, 34 , 52 the latter have a massive skeleton, 34 in opposition to the multi-element skeleton of Corumbella .…”

Section: Discussionmentioning

confidence: 99%

Ediacaran Corumbella has a cataphract calcareous skeleton with controlled biomineralization

Osés¹,

Wood²,

Romero³

et al. 2022

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Section: Discussionmentioning

confidence: 99%

Ediacaran Corumbella has a cataphract calcareous skeleton with controlled biomineralization

Osés¹,

Wood²,

Romero³

et al. 2022

iScience

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“…Olivooids consist of a cone-shaped organic periderm showing circular ribs (annulations) and numerous vertical striations (Steiner et al, 2014). Both the embryonic and apical regions of olivooids are greater than 0.5 mm in diameter, suggesting that these animals produced large eggs containing enough yolk for direct development (Dong et al, 2013, 2016; Han et al, 2013, 2016b, 2016c; Wang et al, 2017; Shao et al, 2018). Because the apical region of S. yanjiaheensis is also large, development in this species, too, may have been direct.…”

Section: Discussionmentioning

confidence: 99%

A fourteen-faced hexangulaconulariid from the early Cambrian (Stage 2) Yanjiahe Formation, South China

et al. 2019

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Extant medusozoans (phylum Cnidaria) are dominated by forms showing tetraradial symmetry, but stem-group medusozoans of early Cambrian age collectively exhibit tetra-, bi-, penta-, and hexaradial symmetry. Moreover, the developmental and evolutionary relationships between four-fold and other types of radial symmetry in medusozoans remain poorly understood. Here we describe a new hexangulaconulariid, Septuconularia yanjiaheensis new genus new species, from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) in the Three Gorges area of Hupei Province, China. The laterally compressed, biradially symmetrical periderm of this species possesses 14 gently tapered faces, the most of any hexangulaconulariid described thus far. The faces are bordered by longitudinal ridges and crossed by short, irregularly spaced transverse ribs. Longitudinally, the periderm consists of three regions that probably correspond, respectively, to an embryonic stage, a transient juvenile stage, and a long adult stage. Septuconularia yanjiaheensis may have been derived from six-faced Hexaconularia (Fortunian Stage), which is morphologically intermediate between Septuconularia yanjiaheensis and Arthrochites. Furthermore, conulariids sensu stricto, carinachitids, and hexangulaconulariids may constitute a monophyletic group united by possession of an organic or organophosphatic periderm exhibiting longitudinal (corner) sulci, a facial midline, and offset of transverse ribs along the facial midline.UUID: http://zoobank.org/01a972aa-aef3-4eef-a9a5-c2d8c3dda615

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“…5). All available evidence indicates that olivooid embryos, which measure ~500–700 μm in diameter, underwent direct development (Han et al, 2013; Duan et al, 2017; Shao et al, 2018). The apical region of Octapyrgites elongatus, the diameter of which exceeds 1,000 μm, is substantially larger than the earliest juvenile stage and embryos of other olivooids (see Steiner et al, 2014, fig.…”

Section: Discussionmentioning

confidence: 99%

A new tetraradial olivooid (Medusozoa) from the lower Cambrian (Stage 2) Yanjiahe Formation, South China

et al. 2019

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Octapyrgites elongatus n. gen. n. sp., a relatively rare, tetraradial olivooid (Cnidaria, Medusozoa), is described from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) near Yichang, China. Although similar to Olivooides and Quadrapyrgites from the Fortunian Stage in consisting of a partially corrugated (longitudinal) periderm with a quadrate (transverse) apical portion and V-shaped apertural lobes, O. elongatus is substantially larger than other olivooids. The elongate apical region of O. elongatus is similar to four-sided Anaconularia anomala (Barrande, 1867), though with a flat tip that may have been an adaption for a sessile mode of life. As in other olivooids, embryonic development in O. elongatus may have been direct. Last, the paucity of olivooids and the absence of pentaradial cnidarians and carinachitids in Cambrian Stage 2 indicate a marked decline in the disparity of cnidarians near the Fortunian–Cambrian Age 2 boundary, when by contrast bilaterians underwent rapid diversification.UUID: http://zoobank.org/60acc2f9-44f8-4a97-9449-960ad76f8fff

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The Fortunian (lowermost Cambrian) Qinscyphus necopinus (Cnidaria, Scyphozoa, Coronatae) underwent direct development

Cited by 11 publications

References 20 publications

Ediacaran Corumbella has a cataphract calcareous skeleton with controlled biomineralization

Ediacaran Corumbella has a cataphract calcareous skeleton with controlled biomineralization

A fourteen-faced hexangulaconulariid from the early Cambrian (Stage 2) Yanjiahe Formation, South China

A new tetraradial olivooid (Medusozoa) from the lower Cambrian (Stage 2) Yanjiahe Formation, South China

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