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Pentagonopentagonalis annulus

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( a – l )  <span class="search-highlight">Pentagonopentagonalis</span>  (col.)  <span class="search-highlight">annulus</span>  sp. nov., holotype ( j ,...
Published: 18 October 2024
Fig. 2. ( a – l ) Pentagonopentagonalis (col.) annulus sp. nov., holotype ( j , l ) and selected paratypes. Images illustrate mainly external moulds of articular facets. ( a – e ) GLAHM 163415. ( a ) GLAHM 163415/1a and 2a. Scale bar represents 2 mm. ( b , c ) GLAHM 163415/1a and 1b, part
Image
( a – d )  <span class="search-highlight">Pentagonopentagonalis</span>  (col.)  <span class="search-highlight">annulus</span>  sp. nov., paratypes, art...
Published: 18 October 2024
Fig. 3. ( a – d ) Pentagonopentagonalis (col.) annulus sp. nov., paratypes, articular facets. ( a ) GLAHM 163420, pentalobate outline. ( b ) GLAHM 163422, irregular lumen. ( c , d ) GLAHM 163423, pentalobate outline ( c ) and detail of facet suggesting the presence of a thin, overlying
Image
<span class="search-highlight">Pentagonopentagonalis</span>  (col.)  <span class="search-highlight">annulus</span>  sp. nov., GLAHM 163414&#x2F;2, paratype,...
Published: 18 October 2024
Fig. 4. Pentagonopentagonalis (col.) annulus sp. nov., GLAHM 163414/2, paratype, pluricolumnal preserved as natural mould. Infill of axial canal is too poorly preserved to confirm if the pluricolumnal is either homeomorphic(?) or heteromorphic, but it is more probably the latter. Scale bar
Image
( a – f )  <span class="search-highlight">Pentagonopentagonalis</span>  (col.)  <span class="search-highlight">annulus</span>  sp. nov., paratypes, art...
Published: 18 October 2024
Fig. 6. ( a – f ) Pentagonopentagonalis (col.) annulus sp. nov., paratypes, articular facets. ( a ) GLAHM 163413. ( b ) GLAHM 163409. ( c , d ) GLAHM 163412. ( c ) Several specimens on bedding plane. ( d ) Large pentagonal specimen with irregularly shaped lumen. ( e , f ) GLAHM 163414. ( e
Image
( a – k )  <span class="search-highlight">Pentagonopentagonalis</span>  (col.)  <span class="search-highlight">annulus</span>  sp. nov., paratypes, art...
Published: 18 October 2024
Fig. 7. ( a – k ) Pentagonopentagonalis (col.) annulus sp. nov., paratypes, articular facets. ( a – d ) GLAHM 163403. ( a ) Bedding plane with three columnals. Scale bar represents 2 mm. ( b , c ) Circular columnals. ( d ) Large, rounded pentagonal columnal. ( e ) GLAHM 163404. ( f ) GLAHM
Journal Article
Published: 18 October 2024
Scottish Journal of Geology (2024) 60 (2): sjg2024-007.
...Fig. 2. ( a – l ) Pentagonopentagonalis (col.) annulus sp. nov., holotype ( j , l ) and selected paratypes. Images illustrate mainly external moulds of articular facets. ( a – e ) GLAHM 163415. ( a ) GLAHM 163415/1a and 2a. Scale bar represents 2 mm. ( b , c ) GLAHM 163415/1a and 1b, part...
FIGURES | View All (8)
Image
Schematic restoration of the articular facet of a pentagonal  Pentagonopent...
Published: 18 October 2024
Fig. 8. Schematic restoration of the articular facet of a pentagonal Pentagonopentagonalis (col.) annulus sp. nov. with swollen angles, based mainly on GLAHM 163404 ( Fig. 7e ).
Image
Schematic restoration of the articular facet of a pentagonal  Pentagonopent...
Published: 18 October 2024
Fig. 5. Schematic restoration of the articular facet of a pentagonal Pentagonopentagonalis (col.) annulus sp. nov. based mainly on the holotype ( Fig. 2j and l ). Scale bar represents 1 mm.