Rodney Feldmann

Kent State University | KSU · Department of Geology

The Cretaceous crab Dromiopsis oscari Nyborg et al., 2019 is herein reviewed and removed from Dynomenidae Ortmann 1892 and placed in Goniodromitidae Beurlen, 1932. Sabel- lidromites oscari (Nyborg et al., 2019) n. comb. is reassigned and newly diagnosed and described. Fossil species of Sabellidromites are associated with shallow continental shelf e...

Treatise Online no. 179: Part R, Revised, Volume 1, Generalized external adult Decapoda morphology

We describe the first discovery of a Cretaceous crab in the Orenburg region (Russia) and the entire Cis-Urals region. Silvacarcinus cisuralicus sp. nov. can be assigned to the genus Silvacarcinus Collins and Smith, 1993, previously known only from one species S. laurae. It is noteworthy that the new species significantly expands the stratigraphic r...

PART R, REVISED, VOLUME 1, TREATISE ONLINE 173: SYSTEMATIC DESCRIPTIONS: ANOMURA (GASTRODOROIDEA, LITHODOIDEA, LOMISOIDEA, PAGUROIDEA)

The superfamily Dromioidea (Decapoda, Brachyura) includes six families of true crabs that first appeared in the fossil record during the Aptian (Early Cretaceous). Members of the family Dromiidae are well known in modern oceans as sponge carriers that utilize a reduced and sub-dorsal 5th pereopod in order to hold onto the sponge. Along with these c...

Tang et al. (2021) described Malayacyclus terengganuensis as a new genus and new species from the Early Carboniferous (Visean) of Terengganu, eastern Peninsular Malaysia. Although the description and figures given by Tang et al. (2021) fully characterise the new genus and species, the journal in which the description appeared was published online-o...

Necrocarcinus gorbenkoi sp. nov. from the Lyamino Formation (Cenomanian, Upper Cretaceous) from Moscow Region represents the third discovery of crabs in Central Russia and the first member of the genus Necrocarcinus in this geographical area. Morphologically, the new species is close to the species N. bodrakensis Levitskyi, 1974, N. tauricus Ilyin...

The Superfamily Dromioidea is one of the earliest groups of extant crabs to appear in the fossil record. Though the superfamily has been recognized since the 1800s, a comprehensive study of the evolution, paleoecology, and biogeography of fossil extant members has yet to be conducted. Dromioidea first appeared in the fossil record in the Cretaceous...

Extinction and origination of genera and families of marine Decapoda at the end of the Cretaceous established the modern fauna. Podotrematous crabs suffered high extinction levels, whereas heterotrematous crabs experienced both extinction and radiation. Anomuran decapods exhibited high extinction levels at the generic but not family level. In gener...

New specimens of Late Jurassic and Early Cretaceous decapods from Argentina document new species and new occurrences. Pehuenchia Rusconi, 1948, originally placed within Palinura and subsequently placed within Callianassidae or Mecochiridae, is herein referred to Mecochiridae. The type species, Pehuenchia tellecheai Rusconi, 1948, is herein illustra...

Faunal turnover is a pattern of diversification and extinction in taxa throughout the geologic record. Patterns of repeated faunal turnovers are referred to as faunal progression, demonstrated by Decapoda in clawed lobsters and podotrematous and heterotrematous crabs. The transition between podotrematous and heterotrematous crabs is the most recent...

The end-Permian mass extinction led to the disappearance of >81% of marine species and the collapse of marine ecosystems. Despite the progress made in recent years, the severity of the impact of the mass extinction upon some groups still remains unclear. Horseshoe crabs are a typical example among these groups. Here we report a new fossil horseshoe...

A new genus and species of cyclidan Magnitocyclus struveae gen. et sp. nov., from the Mississippian of the Urals is described and illustrated. It is the first reliable record of a cyclidan in the Upper Viséan-Lower Serpukhovian of Russia. Petschorocaris kozhimensis, from the Permian of the Pechora Coal Basin (Russia), is not a cyclidan but is appar...

A single concretion derived from the Miocene Greta Siltstone in North Canterbury, South Island, New Zealand, contains an adult and a juvenile individual of Trichopeltarion greggiDell, 1969. The association of an adult female and a juvenile brachyuran of the same species has not been documented previously in the fossil record. Condition of the chalk...

Several hundred specimens of the crab Dakoticancer overanusRathbun, 1917 represent a normal size-distributed adult population, with a skewed sex ratio of 21% females to 79% males. Sexual dimorphism is clearly developed in the shape of the sternum and pleon as well as overall carapace size. The Dakoticancer Assemblage displays a variety of intersex...

Two well preserved specimens of nephropid lobster from the Late Cretaceous (late Campanian) Point Loma Formation in San Diego County, California, form the basis of description of a new species of Hoploparia. The occurrence represents the southernmost fossil record of macrurans along the Pacific coast of North America and it is only the third fossil...

A new fossil pinnotheroid crab from the late Miocene (Tortonian) Little Cove Point Member of the St. Marys Formation of Maryland, marking the first occurrence of a pinnotheroid from the Chesapeake Group, is herein described on the basis of several well preserved specimens. They are only known to occur in a highly-localized, finely-bedded lens, whic...

Malayacyclus terengganuensis, a new genus and species of the Cyclida (Crustacea), is reported from the Early Carboniferous (Visean) of Terengganu, eastern Peninsular Malaysia (East Malaya Block). The new genus possesses diagnostic features of both families Cyclidae and Americlidae. Plus, it develops the trifurcate posterior spines: a unique morphol...

It is rare to find Early Jurassic crustacean material outside of Europe but the discovery of the Ya Ha Tinda Lagerstätte in Alberta, Canada has significantly increased the number of specimens, specifically of the genus Uncina. New articulated specimens of Uncina pacifica and Uncina ollerenshawi preserve the majority of the cephalothorax and pleon,...

The Society of Vertebrate Paleontology (SVP) has recently circulated a letter, dated 21st April, 2020, to more than 300 palaeontological journals, signed by the President, Vice President and a former President of the society (Rayfield et al. 2020). In this letter, significant changes to the common practices in palaeontology are requested. In our pr...

The Society of Vertebrate Paleontology (SVP) has recently circulated a letter, dated 21st April, 2020, to more than 300 palaeontological journals, signed by the President, Vice President and a former President of the society (Rayfield et al. 2020). In this letter, significant changes to the common practices in palaeontology are requested. In our pr...

Recently, the Society of Vertebrate Paleontology (SVP) has sent around a letter, dated 21st April, 2020 to more than 300 palaeontological journals, signed by the President, Vice President and a former President of the society (Rayfield et al. 2020). The signatories of this letter request significant changes to the common practices in palaeontology....

All cyclidan species represented by existing material are illustrated photographically. New genera within Cyclidae include Ambocyclus new genus; Carabicyclus new genus; Chernyshevine new genus, Litocyclus new genus; and Tazawacyclus new genus with the following new combinations: A.). A neotype is herein designated for Halicyne plana. Each family wi...

A collection of decapod fossils from the Miocene St. Marys Formation, Little Cove Point Member (Maryland, USA), yielded six species belonging to three genera of brachyuran crabs, NecronectesA. Milne-Edwards, 1881, CallinectesStimpson, 1860, and CancerLinnaeus, 1758. Cancer included four species, Cancer irroratusSay, 1817; C. borealisStimpson, 1859;...

The description of a new species of an erymid lobster, Stenodactylina beardi, from the Upper Cretaceous Haslam Formation of the Nanaimo Group on Vancouver Island, British Columbia, Canada, brings to fifteen the number of Erymidae in North America. The species are arrayed within five genera based upon configuration of carapace groove morphology, res...

In the comment on our paper (this issue), Zatoń (2020) questions the conclusions reported in Błażejowski et al. (2019). We present further arguments defending our theses. Late Jurassic horseshoe crabs preserved in sediments of the Kcynia Formation, (Owadów-Brzezinki Quarry), lived in a restricted lagoon repeatedly subjected to dysoxia/anoxia, which...

The best-preserved Scottish species of a cyclidan is reinterpreted, based upon recent advances in cyclidan paleobiology. Americlus rankini (Woodward, 1868) is one of the best-preserved members of this crustacean group, and its morphology suggests that it and related forms exhibited a unique and distinct morphology within Multicrustacea. Paleoecolog...

Discovery of a single specimen of a nearly complete cephalothorax and pleon of a new arthropod from the Late Devonian (Famennian) Chagrin Shale Member of the Ohio Shale Formation in Lake County, northeastern Ohio, USA documents the oldest known representative of the Axiidea. The specimen documents a new genus and species, Devonoaxius garlandi, and...

Within the crustacean group Cyclida, Prolatcyclus gen. nov. includes two species, Prolatcyclus martinensis (Goldring, 1967) and P. kindzadza sp. nov., described from the Lower Carboniferous (Mississippian, upper Viséan) of England and the Southern Urals of Russia, respectively. Members of the genus have a unique feature for cyclids – large hypertro...

The Cyclida comprise six families embracing 55 species in 17 genera. Diagnoses for each family based upon examination of type and referred material as well as photographs of specimens previously known only from drawings has confirmed that four of the families, Cyclidae Packard, 1885; Americlidae Dzik, 2008; Halicynidae Gall & Grauvogel, 1967; and S...

An incomplete arthropod fossil, Tricarina gadvanensis Feldmann et al., 2007, from the Lower Cretaceous (Barremian–Aptian) of Iran, originally interpreted as a lobster (Malacostraca, Eucarida, Decapoda), is reinterpreted herein as a representative of a seroloid isopod crustacean (Malacostraca, Peracarida, Isopoda). The body orientation of the fossil...

Neohelice granulata is an endemic, burrowing intertidal species of crab distributed in mudflats and saltmarshes of bays and lagoons along the coast, from southern Brazil to northern Patagonia (Argentina). It is widely known in modern population studies dealing with ecology, genetics, physiology, and burrowing. However, it is known in the fossil rec...

Examination of 36 specimens of the Pennsylvanian horseshoe crab Euproops danae (Meek & Worthen, 1865) from a previously unreported occurrence in the lower Mercer Shale exposed in an abandoned strip mine south from Windber, Pennsylvania, USA, document ontogen-etic changes in prosomal morphology. Intercardiophthalmic transverse bars become less prono...

Full text available at: https://advances.sciencemag.org/content/5/4/eaav3875/tab-pdf. Evolutionary origins of novel forms are often obscure because early and transitional fossils tend to be rare, poorly preserved, or lack proper phylogenetic contexts. We describe a new, exceptionally preserved enigmatic crab from the mid-Cretaceous of Colombia and...

Investigation of decapod crustaceans from Paleogene sediments of Mississippi has yielded one new Eocene brachyuran species, Matutites periosusn. sp., and six new Oligocene brachyuran species, Lophoranina linckin. sp., Notopus adinaen. sp., Calappilia granulosan. sp., C. perreaultin. sp., C. gableorumn. sp., and Acanthocarpus osbornin. sp. Other occ...

Specimens collected from the Lower Cretaceous (Albian) Hudspeth Formation, Oregon, are referable to Anoplocarcinus hudspethi new genus, new species. The new taxon is supported by phylogenetic analysis as well as comparison to type and referred material within Orithopsidae of Raninoida. Albian decapods are rare from the Pacific Coast of North Americ...

Fossil caridean shrimp of Palaemonidae are reasonably common in Cretaceous and Oligocene deposits of Brazil. Reexamination of species assigned to Pseudocaridinella Martins-Neto and Mezzalira, 1991b, indicate that a new genus, Bahiacaris n. gen., must accommodate one of the referred species, Bahiacaris roxoi new combination. Palaemonidae invaded fre...

Approximately 10% of Late Jurassic (Tithonian) horseshoe crabs collected from the Kcynia Formation in the Owadów-Brzezinki Quarry, Central Poland, display microborings covering the entire carapace of specimens. Detailed examination of the surrounding sediment indicates the occurrence of short-term fluctuations in the oxygenation level of bottom wat...