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holdfasts

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Journal Article
Published: 19 September 2013
Geological Magazine (2013) 151 (4): 649-665.
... of these holdfasts are multi-plated discoidal structures representing the thecal attachments of diploporite ‘cystoids’. This large population of holdfasts permits the first detailed taphonomic and palaeoecologic study of hardground diploporite attachments, allowing for increased morphological understanding...
FIGURES | View All (10)
Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/SP286.23
EISBN: 9781862395343
... structures resembling the root offshoots of sponges or rhizoids of algae rather than flexible tentacles, as has been suggested in the past. These structures originally penetrated liquid sediment, served for anchoring within it and, could have been nutrient collectors. Hiemalora holdfasts seem to have had...
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Journal Article
Published: 01 October 1980
Canadian Journal of Earth Sciences (1980) 17 (10): 1431-1435.
...Samuel J. Nelson; Thomas E. Bolton Abstract Well-preserved, enigmatic and striking, partially interlocking slender star-like structures from the Mississippian of the southern Canadian Rockies are incertae sedis , but may possibly be bryozoan holdfasts. They represent a new genus, Macgowanella...
Journal Article
Published: 18 September 2017
Journal of Paleontology (2017) 91 (6): 1091-1101.
...Ye Wang; Yue Wang; Wei Du Abstract The fixing organ of the Precambrian macroalga was briefly described by most researchers as a holdfast or rhizoid, suggesting a fixation structure and/or tissue differentiation. An Ediacaran macroscopic alga, Discusphyton whenghuiensis n. gen. n. sp...
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Circular  Arborea  <b>holdfasts</b> attached to cylindrical stem. ( 1 ) Specimen P...
Published: 14 March 2018
Figure 2 Circular Arborea holdfasts attached to cylindrical stem. ( 1 ) Specimen P14186 with large central boss and several radial striations most likely representing soft-tissue folding during compression. ( 2 ) Specimen P40332 with deflated disc similar in size to the stem. Scale bars=1 cm.
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Figure 3. <b>Holdfasts</b> from the Cantabrian Mountains. A) Specimen BMNH EE13930...
in > PALAIOS
Published: 01 December 2010
Figure 3. Holdfasts from the Cantabrian Mountains. A) Specimen BMNH EE13930 (Natural History Museum, London, UK) in lateral view. Arrows indicate the surface where the specimen was attached. Note the microfractures that flank the holdfast produced after differential compaction of limestone
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Figure 4. Isolated <b>holdfasts</b> from Morocco and Australia. A–C) Scanning elec...
in > PALAIOS
Published: 01 December 2010
Figure 4. Isolated holdfasts from Morocco and Australia. A–C) Scanning electron microscopy images of pelmatozoan (eocrinoid?) holdfasts from the earliest middle Cambrian, Brèche à Micmacca Member (Lemdad section 11, High-Atlas, Morocco). A) BMNH EE13915, upper (proximal) and oblique views. B
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FIGURE 2 —Millericrinid <b>holdfasts</b> from the Kimmeridgian of the Małogoszcz q...
in > PALAIOS
Published: 01 November 2008
FIGURE 2 —Millericrinid holdfasts from the Kimmeridgian of the Małogoszcz quarry with preservation of fossil pigments. A) Longitudinal section (GIUS-8-2324/1); scale bar = 10 mm. B–D) Transverse sections (GIUS-8-2324/2, GIUS-8-2324/3, GIUS-8-2324/4); scale bar = 10 mm. E–F) Photomicrographs
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FIGURE 3 —Stacked-cone <b>holdfasts</b> of millericrinids. (A) Complete specimen o...
in > PALAIOS
Published: 01 June 2005
FIGURE 3 —Stacked-cone holdfasts of millericrinids. (A) Complete specimen of Apiocrinites ; Upper Jurassic, England (YPM 6507). The holdfast is a simple cone, as appropriate for a rockground dweller. (B–F) On softgrounds in the Upper Jurassic, Switzerland, similar cones (cf., Apiocrinites
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FIGURE 4 —Bowl-shaped <b>holdfasts</b> from the Lower Devonian Becraft Limestone, ...
in > PALAIOS
Published: 01 June 2005
FIGURE 4 —Bowl-shaped holdfasts from the Lower Devonian Becraft Limestone, New York. (A) Convex-up position as revealed by geopetal voids in section (NYSM 16080). (B, C) Aspidocrinus scutelliformis Hall. (B) Convex side overgrown by bryozoan. Enlarged pictures show that the articulation surface
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FIGURE 11 —Rhizoidal <b>holdfasts</b> ( Eucalyptocrinites ) from the Silurian, Got...
in > PALAIOS
Published: 01 June 2005
FIGURE 11 —Rhizoidal holdfasts ( Eucalyptocrinites ) from the Silurian, Gotland, Sweden lack a cuticular coating and therefore show the original articulation. (A) Nodal with five rhizoid cirri. Shaded stubs stem from the next nodal at a higher level. Magnified portions show that cirrules branch off
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Figure   6—Sphenothallus  sp. 2. Approximately 35 <b>holdfasts</b> attached to the...
Published: 01 May 2000
Figure 6—Sphenothallus sp. 2. Approximately 35 holdfasts attached to the pedicle valve of Hebertella occidentalis (Hall, 1847) from the Grant Lake Formation, Kentucky, CMNH 11421. Uncoated, photographed using polarized light. Scale bar equals 1 cm
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Figure  9 —<b>Holdfasts</b> of and attachment to  Bangtoupocrinus kokeni  n. gen. ...
Published: 01 January 2000
Figure 9 —Holdfasts of and attachment to Bangtoupocrinus kokeni n. gen. n. sp. from the lower Upper Anisian (Leidapo Member) north-northeast of Qingyan, Guizhou Province, southwestern China. 1–3, Proximal multiradiate articulation facet, lateral view, and distal attachment area of discoid
Journal Article
Published: 01 July 2010
Journal of Paleontology (2010) 84 (4): 626-645.
...JAMES C. BROWER Abstract The camerates, Pycnocrinus argutus ( Walcott, 1883 ) and Rhaphanocrinus subnodosus ( Walcott, 1883 ), are characterized by narrow food grooves. An open distal stem coil was present in P. argutus , and R. subnodosus may have possessed the same type of holdfast...
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Journal Article
Published: 01 May 2008
Journal of Paleontology (2008) 82 (3): 576-584.
...James C. Brower Abstract Three crinoids are known from the Upper Ordovician Hatter Limestone at Union Furnace in central Pennsylvania, i.e., Haptocrinus buttsi n. sp., an unknown crinoid with a lichenocrinid holdfast, and an indeterminate columnal that probably belongs to a crinoid. Two crowns...
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Journal Article
Published: 19 February 2008
Canadian Journal of Earth Sciences (2008) 45 (2): 135-140.
...Kathy A. Hollis; William I. Ausich Abstract Gilbertsocrinus is a common Middle Devonian to Lower Mississippian crinoid from Europe, North America, and China. This crinoid has several very unusual features, such as tegmen appendages, minute arms, a very flexible column, and an unusual holdfast...
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Diversity of frondomorph <b>holdfast</b> structures with root-like extensions:  1 ...
Published: 01 March 2014
Figure 3 Diversity of frondomorph holdfast structures with root-like extensions: 1 , Mawsonites spriggi Glaessner and Wade, 1966 , Rawnsley Quartzite, Ediacaran Range, South Australia, holotype SAM F17009; 2 , Mawsonites reticulatus ( Gehling and Rigby, 1996 ), Khatyspyt Formation, Olenek
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<b>Holdfast</b> of  Eucalyptocrinites  (Crinoidea) on microbioherm,
              ...
Published: 19 September 2013
Figure 9. Holdfast of Eucalyptocrinites (Crinoidea) on microbioherm, displaying extreme swelling by growth of secondary stereom. L – distorted lumen; S – secondary stereomic overgrowth. The exact reasons for this skeletal modification, which
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Fig. 5.   (A–B) Tuberous <b>holdfast</b> affiliated to  Gilbertsocrinus  by  Lane ...
Published: 19 February 2008
Fig. 5. (A–B) Tuberous holdfast affiliated to Gilbertsocrinus by Lane (1963) from the Edwardsville Formation, Crawfordsville, Indiana, UCMP 14089. (A) Holdfast in lateral view preserved vertically in siltstone. Nearly symmetrical shape and small irregularities at base; ×1.0. (B) Upper
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Figure  6 — 1, 2,  <b>Holdfast</b> indeterminant, lateral views, USNM 529103, ×2.5...
Published: 01 September 2007
Figure 6 — 1, 2, Holdfast indeterminant, lateral views, USNM 529103, ×2.5. 3, 4, Cladid indeterminant 2, lateral views of crushed proximal parts of crown, USNM 529099, ×2.7. 5, Cladid? indeterminant, lateral view of arm fragment, USNM 529102, ×1.5. 6, Cladid indeterminant 3, lateral view