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platyceratids

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Journal Article
Published: 01 March 2016
Journal of Paleontology (2016) 90 (2): 195–210.
... of two other gastropods from the same formation reveals the following: Platyostoma quadrangulare (Dunbar, 1920) is the only platyceratid gastropod among them; Saffordella tennessensis Dunbar, 1920 has a selenizone above midwhorl so it is an eotomarioidean belonging to the Gosseletinidae; Aulopea nelsoni...
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Frequency of regeneration in genera with infesting <b>platyceratids</b> versus tho...
Published: 07 May 2014
Table 4. Frequency of regeneration in genera with infesting platyceratids versus those without. Significant results indicated by boldface. Genera known to be hosts are significantly more likely to be injured than those on which no parasites have been found. Data from Baumiller and Gahn (2004) .
Journal Article
Journal: Paleobiology
Published: 01 May 2018
Paleobiology (2018) 44 (2): 290–305.
... as an expanded survey of the prevalence of spinosity and infestation by platyceratid gastropods on crinoid genera during the Paleozoic. Spine regeneration frequency in the measured populations is comparable to arm regeneration frequencies from Mississippian Rhodocrinites and from modern deep-water crinoid...
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Proportion of crinoid genera hosting <b>platyceratid</b> gastropod epibionts vs. p...
Published: 01 May 2018
Figure 5 Proportion of crinoid genera hosting platyceratid gastropod epibionts vs. proportion with spines in each time interval for the Paleozoic, with camerates and non-camerates separated. Error bars indicate ±1 SE. The proportion of spiny genera and that of infested genera are well correlated
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Arm regeneration and <b>platyceratid</b> infestation frequencies in camerates (A) ...
Published: 07 May 2014
Figure 5. Arm regeneration and platyceratid infestation frequencies in camerates (A) compared with camerate EAL values (B). Period time bins.
Journal Article
Published: 01 May 2020
Journal of Paleontology (2020) 94 (3): 467–474.
... to the surface. The shell has been serially sectioned, and the trace (including boring and bioclaustration) has been modeled in three dimensions. Healing of the shell evident in serial sections supports a long-term relationship between the brachiopod and borer that we interpret as parasitic. Platyceratid...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 1954
GSA Bulletin (1954) 65 (7): 621–652.
... is a coral biostrome over much of the State but locally passes into a bioherm facies. A basal zone of reworked sand (Springvale of various authors) is included in the Edgecliff wherever present. The Nedrow member is a shaly limestone characterized by a variety of platyceratid gastropods. The upper part...
Journal Article
Journal: PALAIOS
Published: 01 October 1993
PALAIOS (1993) 8 (5): 465–476.
Journal Article
Published: 01 May 1974
Journal of Paleontology (1974) 48 (3): 474–484.
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Proportion of the crinoid genera present in each interval with the followin...
Published: 01 May 2018
Figure 4 Proportion of the crinoid genera present in each interval with the following properties: having spines on different body parts; having spines anywhere on the body; having an elevated anal structure; and hosting platyceratid snails as epibionts. From top to bottom: all genera; Camerata
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Photos of a conjoined shell of brachiopod  Rongatrypa xichuanensis  with a ...
Published: 01 May 2020
Figure 7. Photos of a conjoined shell of brachiopod Rongatrypa xichuanensis with a gastropod shell attached on its surface and two endocasts of platyceratid gastropods Cyclonema? sp. from the upper part of the Shiyanhe Formation (Upper Ordovician) at Shiyanhe section, southwestern Henan
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Figure  2 —Platycrinitids with high basal circlets visible in lateral view....
Published: 01 September 2009
Figure 2 —Platycrinitids with high basal circlets visible in lateral view. 1 , 2 , Elegantocrinus saffordi (Hall, 1858c), USNM S 1401a: 1 , C-ray lateral view of calyx, note the smooth shell material in the CD interray that is a platyceratid gastropod, ×1.0; 2 , tegmen view of theca, note
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Figure 1. Gastropod initial whorls; scale bars = 0.3 mm. A–E: Ancient type ...
in > Geology
Published: 01 September 2003
Figure 1. Gastropod initial whorls; scale bars = 0.3 mm. A–E: Ancient type (openly coiled) from Early Devonian (A, E), Late Silurian (C), and Carboniferous (B, D). A is neritimorph, B is limpet-shaped platyceratid, C is isolated larval shell, E is caenogastropod. F–J: Closely coiled initial whorls
Journal Article
Published: 01 March 2001
Geological Magazine (2001) 138 (2): 228–229.
... and evolutionary history; fossil occurrence; taphonomy; ecology and ecological interactions. These are particularly informative and provide a detailed introduction to the crinoids as living functioning animals. The last chapter is largely concerned with interactions with platyceratid gastropods and other parasites...
Journal Article
Journal: PALAIOS
Published: 01 October 2010
PALAIOS (2010) 25 (10): 636–641.
... ; Leighton, 2001 ). Recent studies have revealed a much greater taxonomic breadth of bored organisms, including crinoids ( Gahn et al., 2003 ), blastoids ( Baumiller, 1993 , 1996 ; Baumiller and Macurda, 1995 ), platyceratids ( Brett, 2003 ; Baumiller et al., 2004 ), and hederellids ( Wilson and Taylor...
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Journal Article
Published: 01 March 2021
Journal of Paleontology (2021) 95 (2): 320–326.
... . A statistically significant difference in calyx size was documented between populations of Paleozoic crinoids that were hosts to parasitic platyceratid gastropods (smaller) and those devoid of parasites (larger) in several studies (e.g., Rollins and Brezinski, 1988 ; Baumiller and Gahn, 2002 ; Baumiller, 2003...
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Journal Article
Journal: Paleobiology
Published: 07 May 2014
Paleobiology (2014) 40 (3): 417–427.
...Table 4. Frequency of regeneration in genera with infesting platyceratids versus those without. Significant results indicated by boldface. Genera known to be hosts are significantly more likely to be injured than those on which no parasites have been found. Data from Baumiller and Gahn (2004) . ...
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Journal Article
Journal: Paleobiology
Published: 01 January 2015
Paleobiology (2015) 41 (1): 89–107.
... 2002 ; Gahn and Baumiller 2005 ), such as platyceratid gastropods (Brett and Walker 2002 ; Brett 2003 ). It was first proposed that platyceratid gastropods attached to crinoid tegmens were engaged in the act of coprophagy (e.g., Hinde 1885 ; Bowsher 1955 ; Lane 1984...
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Journal Article
Published: 01 November 2003
Geological Magazine (2003) 140 (6): 727–728.
... olfaction and vision. This is not to say, however, that some of the current investigators are unaware of some of the subtleties in the investigation of predator–prey interactions. Take the famous case of the platyceratid gastropods and their infestation of mid–Palaeozoic crinoids. As Carlton Brett...
Journal Article
Published: 07 November 2018
Scottish Journal of Geology (2019) 55 (1): 1–5.
... was presumably loose externally or the organism lacked a hard shell as there are no marks generated on the pluricolumnals as might be anticipated from, for example, a platyceratid snail ( Donovan & Webster 2013 ). These small round holes are shallow; a predatory or parasitic infestation would need...
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