Feeding currents: a limiting factor for disparity of Palaeozoic fenestrate bryozoans

Andrés, Juan Luis Suárez; Jackson, Patrick N. Wyse

doi:10.1016/j.palaeo.2015.05.015

Cited by 13 publications

(6 citation statements)

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“…NRF-2/476). Andrés and Wyse Jackson, 2015). Observations in the field indicate an abundance of large colonies of Ptilotrypa bajpaii n. sp.…”

Section: Resultsmentioning

confidence: 99%

“…may represent an evolutionary innovation improving filtering feeding capacity of this bryozoan compared to the branched colony of the type species. Reticulate colonies in bryozoans act as effective filtering architectures in which water currents go through fenestrules (Cowen and Rider, 1972; Cook, 1977; Suárez Andrés and Wyse Jackson, 2015). Observations in the field indicate an abundance of large colonies of Ptilotrypa bajpaii n. sp.…”

Section: Resultsmentioning

confidence: 99%

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A new cryptostome bryozoanPtilotrypafrom the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India

et al. 2019

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A new species of the Paleozoic bryozoan genus Ptilotrypa of the order Cryptostomata is described from the lower part of the Yong Limestone Formation, Katian, Upper Ordovician of the Kumaun Tethys Himalaya: Ptilotrypa bajpaii new species. The presence of the genus Ptilotrypa in the Tethyan Himalaya suggests paleogeographic connections to the Upper Ordovician of North America and, consequently, Upper Ordovician age for the lower part of the Yong Limestone Formation. This species displays a reticulate colony shape, which suggests an efficient filtering capacity in an environment with a high primary production. Morphological peculiarities and systematic assignment of the genus Ptilotrypa are discussed.UUID: http://zoobank.org/898276c8-2924-4da2-ae96-3392cb2ebbc3

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“…NRF-2/476). Andrés and Wyse Jackson, 2015). Observations in the field indicate an abundance of large colonies of Ptilotrypa bajpaii n. sp.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A new cryptostome bryozoanPtilotrypafrom the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India

et al. 2019

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“…A more functionally oriented interpretation of unilaminate and bilaminate configurations is based on whether autozooidal apertures open on one or both sides of a branch or sheet (e.g., McKinney & Jackson, 1989 , p. 56). This trait has important implications for feeding currents and colony form (e.g., Cheetham, 1986 ; McKinney, 1986 ; Suárez Andrés & Wyse Jackson, 2015 ). In this context Hornera could be considered to be developmentally bilaminate but functionally unilaminate.…”

Section: Discussionmentioning

confidence: 99%

“…According to Hageman (2003) Jackson, 1989, p. 56). This trait has important implications for feeding currents and colony form (e.g., Cheetham, 1986;McKinney, 1986;Suárez Andrés & Wyse Jackson, 2015). In this context Hornera could be considered to be developmentally bilaminate but functionally unilaminate.…”

Section: Implications Of Exomural Budding and Composite Branch Constr...mentioning

confidence: 99%

Composite branch construction by dual autozooidal budding modes in hornerids (Bryozoa: Cyclostomatida)

Batson

Tamberg

Taylor

2022

Journal of Morphology

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Horneridae (Cyclostomatida: Cancellata) is a family of marine bryozoans that forms tree-like colonies bearing functionally unilaminate branches. Colony development in this clade is not well understood. We used micro-computed tomography and scanning electron microscopy to trace zooidal budding in Hornera from the ancestrula onwards. Results show that hornerid branches are constructed by dual zooidal budding modes occurring synchronously at two separate budding sites at the growing tips. Frontal autozooids bud from a multizooidal budding lamina. Lateral autozooids bud from discrete abfrontal budding loci by "exomural budding," a previously undescribed form of frontal budding centered on hypostegal pores in interzooidal grooves on the colonial body wall. These two budding modes are integrated during primary branch morphogenesis, forming composite, developmentally bilaminate, branches. Patterns of exomural budding vary among hornerid taxa, and future studies of Cancellata taxonomy and phylogeny may benefit from morphological concepts presented here.

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“…This trait has important implications for feeding currents and colony form (e.g. McKinney, 1986; Suárez Andrés & Wyse Jackson, 2015). In this context Hornera could be considered to be developmentally bilaminate but functionally unilaminate.…”

Section: Discussionmentioning

confidence: 99%

Composite branch construction by dual autozooidal budding modes in hornerids (Bryozoa: Cyclostomatida)

Batson

Tamberg

Taylor

2022

Preprint

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Horneridae (Cyclostomata; Cancellata) is a family of marine bryozoans that form tree-like colonies bearing functionally unilaminate branches. Colony development in this clade is not well understood. We used micro-CT and SEM to trace zooidal budding in Hornera from the ancestrula onwards. Results show that hornerid branches are constructed by dual zooidal budding modes occurring synchronously at two separate budding sites at the growing tips. Frontal autozooids bud from a multizooidal budding lamina. Lateral autozooids bud from discrete abfrontal budding loci by 'exomural budding', a previously undescribed form of budding centred on hypostegal pores in interzooidal grooves on the colonial body wall. These two budding modes are integrated during primary branch morphogenesis, forming composite, developmentally bilaminate, branches. Tracing development back to the founding zooids shows that the ancestrula and adventitious periancestrular autozooids are the first-formed lateral autozooids. They grow as a vertical stem onto which new laterals bud exomurally, intercalating with earlier autozooids to form an expanding funnel. The inner wall of this funnel becomes a ring-shaped budding lamina, from which the first frontal autozooids bud centripetally. When the branch crown splits, the ring lamina is subdivided, each fragment becoming a paramedial budding lamina in its own branch, while new laterals continue to be budded exomurally onto the frontal walls of existing laterals. Co-occurrence of two rare cyclostome frontal budding types - adventitious budding on the ancestrula and exomural budding on the branches - suggests they may be homologous. Patterns of exomural budding vary among hornerids. Narrow-branched taxa possess a single medial line of budding sites on the abfrontal wall; wide-branched species have up to six parallel lines of loci. Exomural budding also occurs sporadically in Calvetia osheai, a radial-branching hornerid. Future studies of cancellate taxonomy and phylogeny may benefit from morphological concepts presented here.

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Feeding currents: a limiting factor for disparity of Palaeozoic fenestrate bryozoans

Cited by 13 publications

References 53 publications

A new cryptostome bryozoanPtilotrypafrom the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India

A new cryptostome bryozoanPtilotrypafrom the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India

Composite branch construction by dual autozooidal budding modes in hornerids (Bryozoa: Cyclostomatida)

Composite branch construction by dual autozooidal budding modes in hornerids (Bryozoa: Cyclostomatida)

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