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Illustration of selected character states. A, Lyreidus tridentatus De Haan, 1841, MFM 192111, 45 = spermatheca opening on endosternite 7/8, 68 = sternite with lyreidid hook; B, Ranilia muricata H. Milne Edwards, 1837 [in 1834-1840], USNM unnumbered, 35 = oblique crest on ischium of third maxilliped, 37 = notodopine-type chela. Scale bars = 1 cm.
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Phylogenetic analysis of most genera within fossil and extant Raninoida (Brachyura) based on 72 adult morphological characters yielded a new superfamily and family level classification for the section. The section was most diverse at the family level during the Late Cretaceous but remains diverse at the genus and species level in the Holocene. New...
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Context 1
... diversity in Raninoida reached its peak in the Campanian, when all seven families were present. Six families were present throughout the entire Late Cretaceous. Ypresian time was the most diverse Cenozoic time period, with four families present. Modern oceans only embrace two families (Fig. ...
Context 2
... diversity.-Peak generic diversity occurred in the Maastrichtian, with 23 recorded genera (Fig. 20). The entire Late Cretaceous ranges from 16-23 genera within each stage. Fig. 20. Diversity curve at genus level for all raninoidans, extinct and extant. Note that the x-axis is not to scale. Table 5. Four major body plans within ...
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... diversity.-Peak generic diversity occurred in the Maastrichtian, with 23 recorded genera (Fig. 20). The entire Late Cretaceous ranges from 16-23 genera within each stage. Fig. 20. Diversity curve at genus level for all raninoidans, extinct and extant. Note that the x-axis is not to scale. Table 5. Four major body plans within ...
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Citations
... We follow the classification of brachyurans proposed by Karasawa et al. (2011) and Luque et al. (2019) for the Raninoida as construed by Ahyong et al. (2007), as it is supported by phylogenetic analysis. Karasawa et al. 2014, with expanded morphology of the new species): Carapace hexa gonal, about as wide as long; there is a small rostrum; apparently with a narrow intraorbital spine; outer orbital spine stout; anterolateral margins with 3 or 4 spines excluding outer orbital spine; hepatic regions are small, subtriangular, separated from the protogastric regions by deep hepatic groove; carapace axially keeled; protogastric regions ornamented with rounded or elongated combshaped tubercles; epibranchial region arcuate; branchial region with longitudinal keel subparallel to axial keel; male sternum narrowly ovate. ...
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 range of the genus Silvacarcinus from the Eo-cene to Upper Cretaceous (Campanian), and it indicates that Silvacarcinus survived the Cretaceous-Paleogene extinction boundary.
... Description: Carapace elongate, much longer than wide, widest at level of epibranchial angle; narrow orbitofrontal margin; subtriangular bifid rostrum slightly depressed distally, not axially keeled, with rimmed lateral margins; very short inner-orbital spines; narrow orbital margins with two spines divided by two deep fissures, first one wider than the second one; short, flat, rounded intra-orbital spines; elongate, lanceolate outer-orbital spines, longer than the intra-orbital ones, frontally directed; anterolateral margins shorter than posterolateral ones; anterolateral margins slightly convex with two spines; short pointed first spine located anteriorly, reduced bump-shaped spine at level of epibranchial angle; entire posterolateral margins narrowing posteriorly; short, rimmed, and slightly convex posterior margin; dorsal regions indistinct; weak branchiocardiac grooves; dorsal surface uniformly granulated. Guinot, Artal, Fraaije & Jagt, 2012;Bournelyreidus Van Bakel, Guinot, Artal, Fraaije & Jagt, 2012;Delyrius Schweitzer, Feldmann, Kues & Bridge, 2017;Hemioon Bell, 1863;and Heus Bishop & Williams, 2000); and Rogueinae Karasawa, Schweitzer, Feldmann & Luque, 2014 with one genera Rogueus Berglund & Feldmann, 1989. Furthermore, Gustafson et al. (2019 reported the new genus Doraranina within the Rogueinae. ...
... Discussion: Based on Van Bakel et al. (2012a), Karasawa et al. (2014) and Schweitzer et al. (2018), the Raninoidea includes two families, Lyreididae Guinot, 1993;Raninidae De Haan, 1833. We rule out the belonging of the studied specimens to the former in having: an elongate carapace that is wider anteriorly and convex in transverse direction; a wide orbitofrontal margin; a supraorbital margin with two deep open fissures with two spines; and wide orbits, characters shared with the latter to which they are assigned. ...
... Subfamily Rogueinae Karasawa, Schweitzer, Feldmann and Luque, 2014 Genus Rogueus Berglund and Feldmann, 1989 Rogueus orri Berglund and Feldmann, 1989 Figures 13, 14 Raninoides washburni of Orr and Kooser, 1971, Fig.4 D, E. Carapace strongly arched side-to-side, less convex than Raninoides but similar to Doraranina, slightly convex front to rear, widest at or just ahead of center of length, posterior margin straight and about half of maximum width. Front margin width about ¾ of maximum carapace width, with prominent rostrum whose tip is divided into two small rounded points by a small longitudinal groove. ...
... However, subspines are a commonly observed character in Raninoidea: in Amphoranina Nyborg, Pasini, Garassino, Van Bakel, Vega and Nyborg, 2020;Doraranina Gustafson, Nyborg and Van Bakel, 2019;Ranina Lamarck, 1801;Pseudorogueus Fraaye, 1995;Bicornisranina Nyborg and Fam, 2008; and Rogueus this character is present. The overall appearance of Bicornisranina and Pseudorogueus are similar to that of Rogueus, however, they are assigned to Raninoidinae Lőrenthey in Lőrenthey andBeurlen, 1929 (Nyborg andFam, 2008;Van Bakel et al., 2012;Karasawa et al., 2014) based on the diagnosis of in particular the orbitofrontal margin. ...
Palaeocene crabs are rare globally; crab faunules at this era are mostly described from reefal environments, and little is reported about non-reefal environments.
A new raninoid crab is described and formally named from Thanetian (upper Palaeocene) non-reefal deeper water deposits of Boussens, southern France. The new species is assigned to the genus Rogueus, from which only two species were previously known, and this new record suggests the genus was widespread in the European Palaeocene.
A rich Palaeocene brachyuran assemblage of this locality is preliminarily presented and briefly discussed. It appears that eubrachyuran crabs dominated this palaeoenvironment. Based on the global fossil record, it appears that brachyuran crabs quickly recovered after the K/Pg extinction event and were able to restock both reefal and non-reefal environments, prior to the explosive diversification of decapods during the Early Eocene Climatic Optimum.
... We follow the classification of brachyurans proposed by Karasawa et al. (2011); Karasawa et al. (2014) and Luque et al. (2019) for the Raninoida as construed by Ahyong et al. (2007), as it is supported by phylogenetic analysis. ...
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 & Alekseev, 1998, and N. labeschii Eudes-Deslongchamps, 1835, but has some differences that allow us to establish a new taxon.
... Decapoda, and all extant infraorders and sections as used herein, have been demonstrated to be monophyletic (Wolfe et al., 2016(Wolfe et al., , 2019. Phylogenies including fossil taxa for all lobsters (Karasawa et al. 2013;Bracken-Grissom et al., 2014), Anomura (Bracken-Grissom et al., 2013), podotrematous crabs ( Karasawa et al.,2011( Karasawa et al., , 2014Luque et al., 2019), and several heterotrematous superfamilies (Karasawa & Schweitzer, 2006;Karasawa et al., 2008;Luque et al., 2021) confirm the monophyly of groups herein. ...
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 general, family extinctions predominantly occurred among podotrematous and heterotrematous crabs, which also exhibit overall shorter family ranges. Possible refugia promoted survival of genera and families into the Paleocene, whereas habitation of the Western Interior Seaway ensured high levels of extinction. Areas proximal to the Chicxulub impact site experienced moderate levels of extinction. Habitat specialists preferentially survived the end-Cretaceous extinction in some clades. Heterotrematous crabs recovered rapidly in the Paleocene, especially in the siliciclastic environments of the Americas. Because decapod crustaceans are highly variable in morphology, habitat, and ecology, no one pattern of extinction and recovery can explain the end-Cretaceous decapod extinction event. Rather, a mosaic of responses in various decapod groups led to their differential survival.
... The fossil record of the Lyreididae (Lyreidinae) is very scarce in North America. Indeed, based on Karasawa et al. (2014) and Schweitzer et al. (2018), Giuliano lyreidus Luque, 2014 andSymethoides Van Bakel, Guinot, Artal, Fraaije &Jagt, 2012 are the only two genera restricted to the Paleocene [Danian (Texas, New Jersey) and Thanetian (Alabama)] reported to date in USA. Oregonina n. gen. ...
... The fossil record of the Lyreididae (Lyreidinae) is very scarce in North America. Indeed, based on Karasawa et al. (2014) and Schweitzer et al. (2018), Giuliano lyreidus Luque, 2014 andSymethoides Van Bakel, Guinot, Artal, Fraaije &Jagt, 2012 are the only two genera restricted to the Paleocene [Danian (Texas, New Jersey) and Thanetian (Alabama)] reported to date in USA. Oregonina n. gen. ...
... Based on Karasawa et al. (2014) and Schweitzer et al. (2018), the holotype and additional specimens of leucosiae can be assigned to the Lyreididae Guinot, 1993 for the orbito-frontal margin tridentate, rostrum longer than inner orbital spines, st4 with proximal symmetric large wing-shaped protuberances, and st5 similar in shape to st4 but smaller (Figs. 3-5). ...
... The most recent faunal turnover in decapods occurred between the Cretaceous and Paleocene and involved a transition between podotrematous and heterotrematous crabs (Schweitzer & Feldmann, 2015). Podotrematous crabs are a paraphyletic group exhibiting the plesiomorphic state in which the female gonopores are on the third pereiopod coxae and male gonopores are on the fifth pereiopod coxae (Karasawa et al., 2011(Karasawa et al., , 2014Davie et al., 2015), which is the basal state for all decapods (Luque et al., 2019;Schram & Koenemann, 2021). Heterotremes are crabs with female gonopores on the sixth thoracic sternite and male gonopores on the fifth pereiopod coxae, considered to be a derived state (Davie et al., 2015). ...
... Because the podotremes are paraphyletic, a monophyletic subset, Raninoida Ahyong, Lai, Sharkey, Colgan & Ng, 2007, was selected for analysis, a group ranging in the fossil record from the Early Cretaceous to the present day (Karasawa et al., 2011(Karasawa et al., , 2014Van Bakel et al., 2012). Raninoidans originated in the Late Jurassic (Van Bakel et al., 2021) and diversified into several body forms during the Early Cretaceous (Karasawa et al., 2014) (Fig. 1). ...
... Because the podotremes are paraphyletic, a monophyletic subset, Raninoida Ahyong, Lai, Sharkey, Colgan & Ng, 2007, was selected for analysis, a group ranging in the fossil record from the Early Cretaceous to the present day (Karasawa et al., 2011(Karasawa et al., , 2014Van Bakel et al., 2012). Raninoidans originated in the Late Jurassic (Van Bakel et al., 2021) and diversified into several body forms during the Early Cretaceous (Karasawa et al., 2014) (Fig. 1). Raninoida as currently construed includes three superfamilies, Necrocarcinoidea Förster, 1968, Palaeocorystoidea Lőrenthey in Lőrenthey & Beurlen, 1929, and Raninoidea De Haan, 1839, and numerous families and genera, mostly extinct (Supplementary material Table S1) following Schweitzer et al. (2018). ...
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. Among these, section Raninoida Ahyong, Lai, Sharkey, Colgan & Ng, 2007, commonly called “frog crabs,” constitutes a major monophyletic group with podotrematous body forms, and the focus of our study. Declines in raninoidan diversity were aligned with mass extinction events and major climate shifts, especially cooling. Likewise, diversification within Raninoida occurred in warm, greenhouse climates. Thus, a major factor in patterns of faunal turnover in Decapoda is shown to be environmental conditions. Raninoidan families exhibiting adaptations facilitating back-burrowing preferentially survived the end-Cretaceous mass extinction event, whereas raninoidans lacking such adaptions did not go completely extinct at the end-Cretaceous but failed to recover diversity. Given the diversification of heterotrematous crabs into a wide variety of ecological niches throughout the Cenozoic, competition may be a secondary, but still crucial, factor in this faunal turnover.
... Fortunately, two specimens of the type species of Necrocarcinus, N. labeschii, retains a thoracic sternum; this was illustrated by Schweitzer et al. (2012: fig. 2), Karasawa et al. (2014: fig. 1D) and Schweitzer et al. (2016: fig. ...
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.
