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New records of Palaeocorystoidea from the Iberian Peninsula and remarks on the taxonomic significance of the posterior margin of Cenomanocarcinus Van Straelen, 1936 and Hasaracancer Jux, 1971 (Decapoda; Brachyura; Cenomanocarcinidae)
Abstract and Figures
Two species of Cenomanocarcinus (Cenomanocarcinidae) from the late Albian and Turonian of Spain are reported herein, increasing the number of Iberian Cenomanocarcinus species. Likewise, Necrocarcinus woodwardii (Necrocarcinidae) is reported for the first time in the Iberian Peninsula and constitutes the southernmost record for the species. As well, the features of the posterior margin of the cenomanocarcinids Cenomanocarcinus and Hasaracancer, are reviewed and clarified.
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... Inner fore-reef Ruiz de Gaona, 1943;Via, 1981Via, , 1982Artal et al., 2012;Fraaije et al., 2008Fraaije et al., , 2009Fraaije et al., , 2013Fraaije et al., , 2019Klompmaker et al., 2011aKlompmaker et al., ,b,c, 2012aKlompmaker et al., ,b, 2013aKlompmaker et al., , 2020 Klompmaker et al., 2011c Cretamaja granulata Distefania incerta Distefania renefraaijei Klompmaker et al., 2012b Eodromites cristinarobinsae Klompmaker et al., 2020 Etyxanthosia fossa (Wright and Collins, 1972) Faksecarcinus koskobiloensis (Klompmaker et al., 2011c) Glyptodynomene alsasuensis Van Straelen, 1944 Shallow marine carbonate platform (coral and microbialite facies) early late Albian 8th Symposium on Fossil Decapod Crustaceans Annuntidiogenes ruizdegaonai Fraaije et al., 2008(in Ossó, 2017) ...
A highly diverse decapod crustacean fauna is described from the classic Aptian outcrop of Cal Cassanyes (Castellet i la Gornal) in Catalonia. Although decapod crustaceans are a minor component of the rich invertebrate assemblages at that locality, the just over fifty specimens collected comprise sixteen taxa assignable to the Macrura, Anomura and Brachyura. Of these, the last-named are the most prominent group, comprising eleven species, representing seven families, inclusive of one representative of the Eubrachyura. On the basis of this material, two new genera and five new species are erected, namely Pagurus? garrafensis sp. nov., Garrafosopon gen. nov. angustus (Wright and Collins, 1972) comb. nov., Vectis
blesai sp. nov., Mesodromilites prietoi sp. nov., Necrocarcinus mariae sp. nov. and Iberodorippe vinea gen. nov., sp. nov. In addition, Hoploparia sp., an indeterminate axiid and one paguroid, as well as one indeterminate galatheoid are recorded here. Material of Distefania incerta (Bell, 1863), the commonest species at the study site by far, of Goniodromites laevis (Van Straelen, 1940) and of Etyxanthosia fossa (Wright and Collins, 1972) represents the first Aptian and stratigraphically oldest records for these taxa.
Added to this list are also Eodromites sp., Paranecrocarcinus? sp. and Pseudonecrocarcinus? sp. The high decapod crustacean diversity at Cal Cassanyes establishes this locality as the richest Aptian assemblage from the Iberian Peninsula, but also one of the richest in the world. The faunal assemblages here are dominated by sponges, and the varied composition of the decapod crustacean faunas can be linked to upwelling currents which provided abundant nutrients. In fact, the establishment of sponge communities played a crucial role in activating the food chain and functioned similarly to a patch reef, creating a relatively sheltered environment that facilitated the colonisation of other invertebrate communities, including decapod crustaceans. The latter occupied various trophic levels as both primary and secondary consumers. Current knowledge of Early Cretaceous decapod crustaceans is scant and hinders a thorough palaeobiogeographical analysis. The present study emphasises the challenges surrounding the identification of endemic taxa, thus impacting our understanding of decapod crustacean palaeobiogeography of the late Early Cretaceous.
A new necrocarcinid crab, Necrocarcinus christinae, is described from the Cenomanian deposits (Woodbine Formation) of Irving, Texas. Only a handful of decapod species are known from this formation but N. christinae sp. nov. remarkably represents the third palaeocorystoid crab. The size of the sole specimen known is much larger than usual for the genus; only the larger size of N. woodwardii is more or less comparable, and this species is morphologically most similar to this species. The closely allied genus Elektrocarcinus is reviewed and its diagnostic characters are discussed; its composition is here revised.
The sole specimen of Necrocarcinus christinae sp. nov. retains a complete female thoracic sternum, with well-preserved spermathecal apertures. These are the first of such structures known from the Necrocarcinidae; they are conspicuously large compared with similar structures in other palaeocorystoid families such as Cenomanocarcinidae and Palaeocorystidae and likely represent the more basal, plesiomorphic character state. In that respect, this new material contributes to a more complete knowledge of the morphology and diversity of the extinct palaeocorystoid stock.
NEMUS 11 (2021)
Resum: El descobriment de Cantabroxanthus loredoensis en els nivells d’espongiaris del Campanià mitjà de Cantàbria (Espanya), incrementa el nombre de decàpodes braquiürs recuperats en els afloraments de la línia costanera de Cantàbria. El nou gènere és ubicat dins la família Feldmanniidae (Etyoidea) en base a les similituds amb el gènere Caloxanthus. També es compara Cantabroxanthus amb membres de Palaeocorystoidea, tot i que les importants diferències observades, com per exemple el marge supraorbital sencer en Cantabroxanthus, exclou qualsevol relació propera amb Palaeocorystoidea.
La present publicació serveix per validar els actes de nomenclatura establerts en Ossó & Díaz-Isa (2014), per tal de complir els requisits indicats a ICZN (2012).
Mots clau: Cantabroxanthus, Decapoda, Etyoidea, Feldmanniidae, Campanià, Cantàbria, península Ibèrica.
The discovery of Cantabroxanthus loredoensis, from the Sponge Beds (middle Campanian) of Cantabria (Spain), increases the number of known Cretaceous brachyuran taxa that the coastline outcrops of Cantabria have yielded. The new genus is herein placed within the family Feldmanniidae (Etyoidea) on the basis of similarities with the genus Caloxanthus. Cantabroxanthus is also compared to the Palaeocorystoidea families, however important differences, for example, Cantabroxanthus possesses an entire supraorbital margin, preclude any relationship with Palaeocorystoidea.
This publication principally serves to validate the nomenclatural acts in Ossó & Díaz-Isa (2014), in order to fulfil the requirements outlined in ICZN (2012).
Keywords: Cantabroxanthus, Decapoda, Etyoidea, Feldmanniidae, Campanian, Cantabria, Iberian Peninsula.
The Barremian–Aptian Paja Formation, as exposed in Villa de Leyva and nearby areas (Boyacá, Colombia), is one of the most fossiliferous Cretaceous units in northern South America, yet no fossil crabs had ever been recorded from this formation in the region. Here we report the first occurrence of crabs from the upper Aptian “Arcillolitas con nódulos huecos” Member of the Paja Formation in Boyacá, belonging to two species of orithopsid crabs: Bellcarcinus aptiensis Luque, 2014 and Planocarcinus olssoni (Rathbun, 1937). The newly collected material — represented by dozens of samples in small nodules — includes individuals preserving key rostral, orbital and pereonal traits previously unknown from the type material. Furthermore, a few specimens of B. aptiensis have swellings in their branchial regions, consistent with the deformation produced by parasitic isopods infesting the crab’s gill chambers. To our knowledge, this is the first record of parasitic isopod traces in the family Orithopsidae, and the oldest evidence of isopod parasitism in raninoidan crabs. The new material here reported increases the number or marine arthropods known from the fossiliferous Paja Formation in Boyacá and provides valuable information for further palaeoecological reconstructions of these shallow-marine settings in northern South America during the Early Cretaceous.
Seventeen species of decapod crustaceans have been described from Campanian through Paleocene rocks in the Santa Marta, López de Bertodano, and Sobral Formations of the James Ross Basin, Antarctica. Of these, nine are new species: Metanephrops rossensis, Glyphea australensis, Paguristes santamartaensis, Munidopsis foersteri, Retrorsichela laevis, Plagiophthalmous collinsi, Rhinopoupinia bicornis, Cristafrons praescientis , and Torynomma (Torynomma) australis. One new family, Retrorsichelidae, and three new genera, Retrorsichela, Rhinopoupinia , and Cristafrons , were also named. This assemblage includes the first notice of brachyurans from the Cretaceous of Antarctica; six species are described. The nephropid lobster Hoploparia stokesi (Weller), the most common decapod throughout the section, exhibits significant morphological change throughout its range from late Santonian or earliest Campanian to Paleocene; however, variation of key features is asynchronous. The raninid brachyuran, Cristafrons praescientis , is second in abundance to H. stokesi. The occurrence of Metanephrops rossensis and Munidopsis foersteri represents the oldest geological records for these genera and the recognition of species of Paguristes, Plagiophthalmous, Torynomma , and Necrocarcinus constitutes the first notice of these genera in Antarctica. Of those taxa that have living congenors, the species of Metanephrops, Linuparus , and Munidopsis occupied habitats at inner shelf depths in the Cretaceous whereas their extant descendants are restricted to outer shelf and bathyal depths. This diverse decapod fauna is dominated by genera that range into the Cenozoic and appears to be a pioneer assemblage.
Twenty-nine new identifications of fossil decapod crustacean remains in the Basque-Cantabrian Basin (Western Pyrenees) spanning from the Jurassic to the Miocene and coming from twentyfour new and five yet known localities are described here for the first time. These remains represent a substantial advance in the knowledge of these faunas and their diversity in this basin, giving an accurate image of the decapod faunal succession. The study includes a taxonomical description and discussion with reference to the known occurrences. Their accurate dating and the environmental ascription have been possible after the analysis of the stratigraphic occurrence in the context of a well-known basinal stratigraphy. This has ultimately permitted a brief analysis of the decapod palaeoecology and faunal turnovers in the context of basin evolution.
Two new Raninoida crabs from the Cretaceous of Texas are described, Planocorystes robreidi new genus new species, and Texicancer new genus to accommodate Necrocarcinus renfroae . All the previously described raninoid-like decapods from the Pawpaw Formation have been reassigned according to Karasawa et al. (2014). Cretaceous raninoid-like crabs are the dominant taxa amongst the fossil decapods found in the Fort Worth, Texas, area, with hundreds of specimens collected. All of these fossils have been collected from limonitic nodules, and most of them present a good degree of preservation, with articulated pereiopods, pleons, venter and in rare occasions even the gills. The decapod fauna of the Pawpaw Formation represents a diverse population, with a large number of taxa in high abundance. One specimen of P . robreidi appears to exhibit a lethal bite mark.
New records of Late Cretaceous cenomanocarcinid crabs are presented. A single, isolated carapace from the middle Santonian of Austria exhibits several distinct features, including a smooth posterolateral margin, and absence of two conical inflations in the intestinal region on both sides of the axial ridge that do not reach the posterior margin. Based on these unique characters, it can be differentiated from all other congeners and described as a new species, Cenomanocarcinus lenzenwegeri. This record is considered to be the youngest European occurrence of the genus known to date. Cenomanocarcinus sp. is recorded from the lower Turonian of Germany, on the basis of a single individual preserved in ventral aspect, previously identified as a tentative representative of the Carcineretidae. The new European occurrences presented herein document the persistence of the genus in that part of the world at least into the Santonian.
The recently traced type specimens of decapod crustaceans erected by H. Forir from the Upper Cretaceous (upper Maastrichtian) of southern Limburg and Liège (southeast Netherlands, northeast Belgium) include Necrocarcinus ornatissimus, a species based on a single left claw. This species is shown to be conspecific with another claw-based taxon from the same area and stratigraphic level, Prehepatus werneri Fraaye & Collins, 1987. Necrocarcinus ornatissimus is thought to be a dynomenid.