Phricodothyris sp.
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publication ID |
https://doi.org/ 10.4202/app.00972.2022 |
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persistent identifier |
https://treatment.plazi.org/id/41708783-FFFC-FF96-8C7E-C823FE8FF909 |
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treatment provided by |
Felipe |
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scientific name |
Phricodothyris sp. |
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Fig. 16O View Fig .
Material.—Three articulated specimens: MPUM12069 RCC54-17b; RCC128-4c; RCK15B-4). Five ventral valves: MPUM12070 (RCC3-1); MPUM12071 (RCC60-4a); MPUM 12072 (RCC1-49; RCC49-35; RCK15-70). All from mud mound complex of Ricklow Quarry, Monyash, Derbyshire, UK, Monsal Dale Limestone Formation, Brigantian, upper Visean.
Remarks.—The specimens are rectimarginate abraded Elythidae lacking ventral adminicula. Because their original lamellose ornamentation is not preserved, they are assigned to an undetermined species of Phricodothyris .
Genus Nebenothyris Minato, 1953
Type species: Nebenothyris lineatus Minato, 1953 , from the upper Visean of the Hagen area in north-western Rheinische Schiefergebirge, Germany .
Fig. 16P View Fig .
Material.— One ventral valve: MPUM12073 View Materials (WI1-26a) from Wensley Dale , Matlock , Derbyshire, UK, Eyam Limestone Formation , upper Brigantian, upper Visean .
Description.—Medium-sized, convex ventral valve with suboval outline; cardinal margin straight; maximum width attained at shell mid-length. Anterior commissure slightly uniplicate. Ventral umbo curved, interarea apsacline. Shell covered by subimbricated lamellae, spaced 1.0 mm in average. Ventral adminicula absent. Prominent ventral median septum, reaching two-thirds valve length.
Remarks.—The specimen is assigned to an undetermined species of Nebenothyris based on the long ventral median septum, ornamentation of broadly spaced lamellae and absence of ventral adminicula. It is close to N. lineata in its morphology, though limited information available on the taxon prevents its identification.
The specimen differs from Nebenothyris rhachis Brunton and Mundy, 1997 , from the upper Visean of Yorkshire and Ireland, and N. tripustulosa (Demanet, 1938) , from the upper Visean of Belgium, in having a more transverse outline; moreover N. rhachis shows a weak ventral sulcus developing from the umbo ( Brunton and Mundy 1997: figs. 1.7, 1.13).
Order Spiriferinida Ivanova, 1972
Suborder Spiriferinidina Ivanova, 1972
Superfamily Pennospiriferinoidea Dagys, 1972
Family Punctospiriferidae Waterhouse, 1975
Genus Punctospirifer North, 1920
Type species: Punctospirifer scabricosta North , 1920, from the Visean of England .
Remarks.— Punctospirifer differs from the allied genus Spiriferellina Fredericks, 1924 , of the Spiriferellinidae Ivanova, 1972 , in having a lower ventral interarea, an angular ventral sulcus without coarse sulcus-bounding costae and a capillate, rather than pustulose, micro-ornamentation. European Carboniferous species assigned to Spiriferellina (e.g., S. insculpta Phillips, 1836 , S. perplicata North, 1920) because of their pustulose micro-ornamentation, are characterised by an angular sulcus with sulcus-bounding costae not exceeding the width of lateral costae.
Fig. 16Q View Fig .
Material.—One ventral valve: MPUM12074 (RCC73-23c) from mud mound complex of Ricklow Quarry, Monyash, Derbyshire, UK, Monsal Dale Limestone Formation, Brigantian, upper Visean.
Description.—Medium-sized, transverse shell. Cardinal margin corresponding to the maximum width. Cardinal extremities mucronate. Anterior commissure uniplicate. Shell substance punctate. Deep angular sulcus starting from umbo, widening and deepening anteriorly; 8.0 mm wide at anterior commissure.
Sulcus smooth. Flanks covered by coarse, simple, angular costae with narrow, subrounded interspaces, extending from the umbo, becoming lower and indistinct laterally. Six to seven costae on each flank.
Remarks.—The specimen is tentatively assigned to Punctospirifer based on its deep subangular sulcus and the absence of coarse sulcus-bounding costae. However, as the micro-ornamentation is not preserved, it is not possible to confirm the assignment.
Order Terebratulida Waagen, 1883
Suborder Terebratulidina Waagen, 1883
Superfamily Cryptonelloidea Thomson, 1926
Family Cranaenidae Cloud, 1942
Subfamily Girtyellinae Stehli, 1965
Genus Harttella Bell, 1929
Type species: Harttella parva Bell, 1929 , from the Lower Windsor Group, Nova Scotia, Canada (upper Visean; Brunton 1982).
Remarks.—The genus was established by Bell (1929) to include terebratulides from Nova Scotia ( Canada) lacking dental plates and having a high Y-shaped septalium. The absence of dental plates distinguishes Harttella from Girtyella Weller, 1911 .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Phricodothyris sp.
| Carniti, Alessandro P., Porta, Giovanna Della, Banks, Vanessa J., Stephenson, Michael H. & Angiolini, Lucia 2022 |
Nebenothyris
| Minato 1953 |
Harttella
| Bell 1929 |