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11 results for “trepostome”
Fig. 5 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 5. Thin sections of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation, Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. Holotype, NMW 2019.21G.2.3, ramose colony form (A1), thick mesozooecia walls connected by diaphragms, continue cystose shape of earlier growth (A2). B. NMW 2019.21G.2.4, autozooecia rounded in cross-section, some irregularly shaped.
Fig. 4 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 4. Thin section of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation, Ludfordian, upper Ludlow; Delbury Quarry, Shropshire, UK. Holotype, NMW 2019.21G.2.3, bryozoan colony encrusting gastropod shell and developing ramose form at shell aperture.
Fig. 2 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 2. Trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation; Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. NMW 2019.21G.7.1, bryozoan encrusting the surface of a gastropod shell. B. NMW 2019.21G.33, bryozoan encrusting the surface of a gastropod shell but not growing across aperture.
Fig. 1 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 1. Map showing the location and geological setting (asterisk) of Delbury Quarry in Shropshire, UK (amended from https://digimap.edina.ac.uk/roam/ map/geology and https://digimap.edina.ac.uk/roam/map/os; accessed 05/08/21).
Data from: Trepostomate bryozoans from the upper Katian (Upper Ordovician) of Morocco: gigantism in high latitude Gondwana platforms
A study of the Upper Ordovician trepostomate bryozoans belonging to the families Amplexoporidae and Monticuliporidae, from the eastern Anti-Atlas of Morocco, is presented here. They occur in the marly to fine-grained limestone, intermediate unit of the Khabt-el-Hajar Formation, late Katian in age, representing outer-ramp depositional environments. They inhabited the highest paleolatitude known for a bryozoan fauna during the Ordovician, estimated at more than 65–70ºS. A total of 11 species of the genera Anaphragma, Atactoporella, Homotrypa, Monotrypa, Monticulipora, and Prasopora are described. Three species are already known from the equatorial-tropical paleocontinents of Baltica, Laurentia, and Siberia: Anaphragma mirabile, Monotrypa jewensis, and Prasopora falesi. Four new taxa are described:Anaphragma undulata, Atactoporella moroccoensis, Monticulipora globulata, and Monticulipora irregularis. The two species of Anaphragma and the one of Atactoporella display significantly larger zoarial sizes than congeneric species, representing gigantism among bryozoans. Polar gigantism is rejected for the two species of Anaphragma as is gigantism related to photosynthetic endosymbionts. An alternative proposal for their giant size is their long zoarial life span due to their well-balanced, robust branching form, with a relatively wide basal supporting surface, adapted to unconsolidated substrates in environments below wave base. Their great stability in outer-ramp environments, with infrequent storms, would allow the zoaria to grow for an extended time and reach large sizes before being overturned and buried. Atactoporella moroccoensis, has both zoaria and zooecia gigantic, suggesting a hypothesis of polar gigantism.
FIGURE 6. Ramose trepostome bryozoans from the Khrevitsa Formation. A–C in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 6. Ramose trepostome bryozoans from the Khrevitsa Formation. A–C. CNIGR museum №2/13403, Homotrypa sp. A. Longitudinal section. B. Longitudinal section showing diaphragms in mesozooecia (arrow). C. Tangential section showing mesozooecia (arrow). D, E CNIGR museum №3/13403, Stigmatella cf. claviformis (Ulrich, 1893). D. Longitudinal section. E. Longitudinal section showing acanthostyles (arrow). F, G. CNIGR museum №8/13403, Hallopora gracilens Bassler, 1927. F. Transverse section. G. Longitudinal section showing abundant diaphragms in mesozooecia (arrow). H. CNIGR museum №9/13403, Hallopora gracilens, tangential section showing mesozooecia (arrow).
FIGURE 7. Massive trepostome bryozoans from the Khrevitsa Formation. A in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 7. Massive trepostome bryozoans from the Khrevitsa Formation. A. CNIGR museum №5/13403, Diplotrypa abnormis (Modzalevskaya, 1953), colony exterior on basal side, arrow shows a crinoid segment on which a colony started to grow. B–E. CNIGR museum №4/13403, Diplotrypa abnormis. B. View on basal side with first point of growing (arrow). C. Longitudinal section showing diaphragms in autozooecia (DiA) and mesozooecia (DiM). D. Tangential section. E. Longitudinal section of colony showing a radial budding. F–H. CNIGR museum №7/13403, Monotrypa jewensis Bassler, 1911. F. Longitudinal section. G. Tangential section. H. Longitudinal section.
FIGURE 5. Trepostome and cryptostome bryozoans from the Khrevitsa Formation. A–C in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 5. Trepostome and cryptostome bryozoans from the Khrevitsa Formation. A–C. CNIGR museum №11/13403, Amplexopora sp. A. Branch colony exterior (micro-CT). B. Longitudinal section showing diaphragms (Di) and cystiphragms (Cy). C. Tangential section showing acanthostyles on the ridges (arrow). D–G. CNIGR museum №1/13403, Nematotrypa robusta (Spjeldnaes, 1984). D. Tangential section showing abundant tektitozooecia (arrow). E. Longitudinal section showing hemiphragms (arrow). F. Tangential section showing paurostyles (Pa) and acanthostyles (Ac). G. Transverse section.
Data from: New Trepostomate bryozoans from the upper Ordovician of Morocco and the temperature influence on zooid size
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Data from: Trepostomate bryozoans from the upper Katian (Upper Ordovician) of Morocco: gigantism in high latitude Gondwana platforms
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Fig. 3 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 3. Thin sections of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation; Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. NMW 2019.21G.5.2, encrusting colonies comprising multiple layers caused by self-overgrowths (A1), apex of gastropod shell encrusted with bryozoan colony (A2), colony does not grow over the gastropod shell aperture (A3, A4). B. NMW 2019.21G.6.2, colony encrusting apertural side of shell thinner than on the abapertural side, arrow indicates Trypanites boring in bryozoan colony. C. NMW 2019.21G.7.3, colony can be seen inside the aperture of gastropod shell.
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