... would have allowed for larger diductor muscles to open a larger, heavier shell. In this study, two new species, Plaesiomys periosa sp. nov. and Plaesiomys lenzi sp. nov., are proposed, and two existing species are transferred from Dinorthis to Plaesiomys. Corresponding author: Colin D. Sproat...

...W. B. N. Berry Abstract Graptolites are not common in shell-rich, fossil-bearing beds. Numerous speecimens of Orthograptus were found associated with the brachiopods Rafinesquina and Dinorthis and with the pelecypod Pteriinea. GeoRef, Copyright 2004, American Geological Institute. Reference...

... being chosen from the Dalmanellacea, Orthacea, and Strophomenacea. The brachiopod indices include 13 new species and varieties of which 4 are referred to Onniella, 5 to a new subgenus, 2 to a new genus, 2 to Wattsella and 1 to Dinorthis . An additional genus and subgenus and 3 new sub-zonal indices...

... the status of Plaesiomys between a discrete genus or a subgenus within Dinorthis Hall and Clark, 1892 . Although suggested by Macomber (1970 ), no prior study has utilized phylogenetic analysis to inform a comprehensive taxonomic revision or assess evolutionary relationships among species of Plaesiomys...

...Figure 10 —Epipunctae and shell surface pits. 1–5, Dinorthis occidentalis ( Okulitch, 1943 ), GSC117813, Stony Mountain Formation, southern Manitoba (GSC locality 37130); 1–3, exterior coated, exterior noncoated (immersed in alcohol), and interior views of ventral valve; 4, 5, fine...

... for plaesiomyids is present in the type material and type species of Dinorthis . The commonly silicified specimens of Dinorthis pectinella (Emmons, 1842 ) in North America have made this determination difficult. In this study, Plaesiomys is treated as an independent genus from Dinorthis...

... cucullus and Orthis testudinaria bicoinis Orthis costalis L Pliomerops ncvadensis L Orthis (Dinorthis) deflectra r U Platymetopus schmklti V Orthis (?) holstoni L Vogdesia bearsi L Orthis acutiplicata Leperditella macra L Plectorphis plicatella r Leperditia...

... of Dinorthis , all Richmond forms. They are not perfectly typical, and Dr. Cumings states that “only the Rhynchotrema is well enough preserved to make an identification at all certain, and this, though smaller, seems to be very close to R. Capax .” This substantiates correlation with the Viola...

... and lchadites cf. iowensis 9 10 254.5 Resistant rough coarse yellow limestone 10 15 269.5 Shale interval 11 4.5 274 Coarse brown limestone 12 7.5 281.5 Mostly shale, some thin limestones at base. Dalmanella fertilis, Dinorthis subquadrata, Herbertella bellarugosa, Orthis tricenaria...

... Stromatocerium pustulosum, Dinorthis ulrichi, Strophomena vicina , and Cyphotrypa frankfortensis . Associated with the Stromatocerium reef in parts of Fayette and Jessamine counties is an equally diagnostic reef composed of the contorted laminae of an undescribed species of Ceramoporella(?) . Two to four...

... Plectambonites sericeus var. Strophomena filitexta Hall Rafinesquina deltoidea Conrad Dalmanella hamburgensis ? Walcott Dinorthis pectinella Hall Platystrophia sp. undetermined (small) Rhyncholrema increbescens Hall Zygospira recurvirostris Hall Vanuxemia gibbosa Ulrich Technophorus subacutus...

... emplacement which commonly results in the fluidization (Kokelaar 1984) or liquefaction of 3-5 m of the underlying sediments (G. J. Orton personal observation). The d pths indicated by sedimentary facies are supported by brachiopod palaeocommunities. All shelly faunas at Pont-y-Gromlech indicate a Dinorthis...

..., Catanipora, Manipora, Protrochiscolithus, Chaetetes, Palaeophyllum, Grewingkia, Lobocorallium ), brachiopods ( Hesperorthis, Platystrophia, Gnamptorhynchos, Glyptorthis, Plaesiomys, Dinorthis, Diceromyonia, Thaerodonta, Strophomena, Tetraphalerella, Kjaerina, Oepikina, Megamyonia, Rhynchotrema, Hiscobeccus...

... that the upper, or quartzite, member of the type Swan Peak may be a younger (Eureka) quartzite resting transgressively on the shaly lower member, the formation then being Chazyan in the lower part and Trentonian in the higher part, with a dividing disconformity ( Webb, 1956 ). Dinorthis ? sp., Leptellina...

... holstonensis Willard, Dinorthis atavoides Willard, Solenopora sp., Acrolichas minganesis (Billings), and Hyboaspis sp. The beds directly below the calcarenite are questionably referred to the Lincolnshire. The Five Oaks and Blackford are thinnly developed below. Overlying the Thompson Valley...

... Ashgill times. Diagnostic taxa of the Hiscobeccus Fauna in Maysvillian and Richmondian strata throughout North America consist of various species of Hiscobeccus, Lepidocyclus , and Hypsiptycha . Other commonly associated brachiopod taxa include large-shelled species of Plaesiomys, Dinorthis...

.... Diceromyonia ignota is also abundant in a 1-foot bed at 30 feet ( Fig. 24 ). Less common are Hypsiptycha spp., Platystrophia, Dinorthis (Plaesiomys?) , and Streptelasma . Many well preserved complete specimens were freed by acid etching. This zone can be traced 12 miles southward to sections 5 and 6...

... contain brachiopods of the Dinorthis–Macrocoelia community, thought to be characteristic of water depths ≤25 m ( Pickerill 1977; Pickerill & Brenchley 1979). He considered the sequence to represent shelf‐ridge sands with interbar siltstones and mudstones, with periodic storms recorded...

... Elias et al. (2013) reported occurrences of Diceromyonia storeya , Plaesiomys occidentalis (reported as Dinorthis ), and Oepikina limbrata in the Gunton Member, and Holtedahlina sp. in the Williams Member. The unusual fossils at the William Lake site, including eurypterids, xiphosurids...