Eocarcinus praecursor is a Jurassic species of decapodcrustacean, sufficiently distinct from its relatives to be placed in its own family (Eocarcinidae).[1] Often considered the oldest true crab, it was considered by a 2010 study to be an early member of the Anomura. However, a reanalysis in 2020 again found it to be the earliest known stem-group crab.[2]
In many of its characters, it represents a transitional stage between the Glypheoidea and the Middle Jurassic crabs in the Prosopidae.[3] Since its ancestors were long-tailed decapods, and its successors were short-tailed crabs, Eocarcinus has been described as "the lobster who decided to become a crab".[5] Previously considered to be the oldest known true crab, a 2010 revision concluded that Eocarcinus could not be accommodated among the Brachyura, and was instead transferred to the Anomura.[6] However, a 2020 reanalysis found that it was again the earliest known stem-group crab, but that it had not undergone the process of carcinisation.[2]
Referencesedit
^Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06.
^ abScholtz, Gerhard (November 2020). "Eocarcinus praecursor Withers, 1932 (Malacostraca, Decapoda, Meiura) is a stem group brachyuran". Arthropod Structure & Development. 59: 100991. doi:10.1016/j.asd.2020.100991. PMID 32891896.
^ abM. Krobicki; M. Zaton (2008). "Middle and Late Jurassic roots of brachyuran crabs: Palaeoenvironmental distribution during their early evolution". Palaeogeography, Palaeoclimatology, Palaeoecology. 263 (1–2): 30–43. Bibcode:2008PPP...263...30K. doi:10.1016/j.palaeo.2008.01.025.
^Danièle Guinot; Marcos Tavares (2001). "Une nouvelle famille de Crabes du Crétacé, et la notion de Podotremata Guinot, 1977 (Crustacea, Decapoda, Brachyura)" (PDF). Zoosystema. 23 (3): 507–546.
^Anonymous (1932). "The Royal Society Conversazione". British Medical Journal. 1 (3724): 946–947. doi:10.1136/bmj.1.3724.944. S2CID 220003084. JSTOR: 1st page, 2nd page
^Rodney M. Feldmann; Carrie E. Schweitzer (2010). "Is Eocarcinus Withers, 1932, a basal brachyuran?". Journal of Crustacean Biology. 30 (2): 241–250. doi:10.1651/09-3230.1.
April 12, 2024
eocarcinus, praecursor, jurassic, species, decapod, crustacean, sufficiently, distinct, from, relatives, placed, family, eocarcinidae, often, considered, oldest, true, crab, considered, 2010, study, early, member, anomura, however, reanalysis, 2020, again, fou. Eocarcinus praecursor is a Jurassic species of decapod crustacean sufficiently distinct from its relatives to be placed in its own family Eocarcinidae 1 Often considered the oldest true crab it was considered by a 2010 study to be an early member of the Anomura However a reanalysis in 2020 again found it to be the earliest known stem group crab 2 EocarcinusTemporal range Pliensbachian PreꞒ Ꞓ O S D C P T J K Pg NHolotype top and paratype bottom specimensScientific classificationKingdom AnimaliaPhylum ArthropodaSubphylum CrustaceaClass MalacostracaOrder DecapodaInfraorder BrachyuraFamily EocarcinidaeWithers 1932Genus EocarcinusWithers 1932Species E praecursorBinomial nameEocarcinus praecursorWithers 1932Reconstruction based on 2020 reanalysisAdditional paratype specimenDistribution editIt lived during the early Pliensbachian age Lower Jurassic 3 and has been found in rocks at two sites in the United Kingdom Mickelton Tunnel near Aston Magna Gloucestershire and Runswick Bay Yorkshire 4 Description editIn many of its characters it represents a transitional stage between the Glypheoidea and the Middle Jurassic crabs in the Prosopidae 3 Since its ancestors were long tailed decapods and its successors were short tailed crabs Eocarcinus has been described as the lobster who decided to become a crab 5 Previously considered to be the oldest known true crab a 2010 revision concluded that Eocarcinus could not be accommodated among the Brachyura and was instead transferred to the Anomura 6 However a 2020 reanalysis found that it was again the earliest known stem group crab but that it had not undergone the process of carcinisation 2 References edit Sammy De Grave N Dean Pentcheff Shane T Ahyong et al 2009 A classification of living and fossil genera of decapod crustaceans PDF Raffles Bulletin of Zoology Suppl 21 1 109 Archived from the original PDF on 2011 06 06 a b Scholtz Gerhard November 2020 Eocarcinus praecursor Withers 1932 Malacostraca Decapoda Meiura is a stem group brachyuran Arthropod Structure amp Development 59 100991 doi 10 1016 j asd 2020 100991 PMID 32891896 a b M Krobicki M Zaton 2008 Middle and Late Jurassic roots of brachyuran crabs Palaeoenvironmental distribution during their early evolution Palaeogeography Palaeoclimatology Palaeoecology 263 1 2 30 43 Bibcode 2008PPP 263 30K doi 10 1016 j palaeo 2008 01 025 Daniele Guinot Marcos Tavares 2001 Une nouvelle famille de Crabes du Cretace et la notion de Podotremata Guinot 1977 Crustacea Decapoda Brachyura PDF Zoosystema 23 3 507 546 Anonymous 1932 The Royal Society Conversazione British Medical Journal 1 3724 946 947 doi 10 1136 bmj 1 3724 944 S2CID 220003084 JSTOR 1st page 2nd page Rodney M Feldmann Carrie E Schweitzer 2010 Is Eocarcinus Withers 1932 a basal brachyuran Journal of Crustacean Biology 30 2 241 250 doi 10 1651 09 3230 1 Retrieved from https en wikipedia org w index php title Eocarcinus amp oldid 1173371507, wikipedia, wiki, book, books, library,
