Achelata Explained

The Achelata is an infra-order of the decapod crustaceans, holding the spiny lobsters, slipper lobsters and their fossil relatives.

Description

The name "Achelata" derives from the fact that all the members of this group lack the chelae (claws) that are found on almost all other decapods (from the Ancient Greek, = "not",, = "claw"). They are further united by the great enlargement of the second antennae, by the special "phyllosoma" form of the larva, and by a number of other characters.[1]

Classification and fossil record

The infraorder Achelata belongs to the group Reptantia, which consists of the walking/crawling decapods (lobsters and crabs). The cladogram below shows Achelata's placement within the larger order Decapoda, from analysis by Wolfe et al., 2019.[2]

Achelata contains the spiny lobsters (Palinuridae), the slipper lobsters (Scyllaridae) and the furry lobsters (Synaxidae, now usually included in Palinuridae),[3] as well as two extinct families, Cancrinidae and Tricarinidae.[4]

Both Palinuridae and Scyllaridae have a fossil record extending back to the Cretaceous.[5] [6] The two fossil families contain a single genus each;[4] Tricarina is known from a single Cretaceous fossil,[7] while Cancrinos is known from the Jurassic and Cretaceous.[6] One estimate of the divergence between Achelata and its closest relatives places it at about .[8]

Notes and References

  1. Gerhard Scholtz . Stefan Richter . 1995 . Phylogenetic systematics of the reptantian Decapoda (Crustacea, Malacostraca) . . 113 . 3 . 289–328 . 10.1006/zjls.1995.0011 .
  2. Wolfe . Joanna M. . Breinholt . Jesse W. . Crandall . Keith A. . Lemmon . Alan R. . Lemmon . Emily Moriarty . Timm . Laura E. . Siddall . Mark E. . Bracken-Grissom . Heather D. . A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans . Proceedings of the Royal Society B . 24 April 2019 . 286 . 1901 . 10.1098/rspb.2019.0079 . 6501934 . 31014217 . free .
  3. Ferran Palero . Keith A. Crandall. Keith A. Crandall . Pere Abelló . Enrique Macpherson . Marta Pascual . 2009 . Phylogenetic relationships between spiny, slipper and coral lobsters (Crustacea, Decapoda, Achelata) . . 50 . 152–162 . 10.1016/j.ympev.2008.10.003 . 18957325 . 1.
  4. Sammy De Grave . N. Dean Pentcheff . Shane T. Ahyong . 2009 . A classification of living and fossil genera of decapod crustaceans . . Suppl. 21 . 1–109 . etal . dead . https://web.archive.org/web/20110606064728/http://rmbr.nus.edu.sg/rbz/biblio/s21/s21rbz1-109.pdf . 2011-06-06 .
  5. Francisco J. Vega . Pedro García-Barrera . María del Carmen Perrilliat . Marco A. Coutiño . Ricardo Mariño-Pérez . 2006 . El Espinal, a new plattenkalk facies locality from the Lower Cretaceous Sierra Madre Formation, Chiapas, southeastern Mexico . . 23 . 3 . 323–333 .
  6. . 2 . 97–110 . 2009 . Development in Mesozoic scyllarids and implications for the evolution of Achelata (Reptantia, Decapoda, Crustacea) . Joachim T. Haug . Carolin Haug . Dieter Waloszek . Andreas Maas . Matthias Wulf . Günter Schweigert .
  7. Rodney M. Feldmann . Ali Kolahdouz . Bijan Biranvand . Guenter Schweigert . 2007 . A new family, genus, and species of lobster (Decapoda: Achelata) from the Gadvan Formation (Early Cretaceous) of Iran . . 81 . 2 . 405–407 . 10.1666/0022-3360(2007)81[405:ANFGAS]2.0.CO;2 . 2012-02-05 . https://web.archive.org/web/20160304044303/http://isopods.nhm.org/pdfs/30391/30391.pdf . 2016-03-04 . dead .
  8. Book: Keith A. Crandall . Megan L. Porter . Marcos Pérez-Losada . Crabs, shrimps and lobsters (Decapoda) . 293–297 . S. Blair Hedges . Sudhir Kumar . 2009 . The Timetree of Life . . 978-0-19-160898-8 . https://books.google.com/books?id=TC2cSR4oQY8C&pg=PA296. Keith A. Crandall .

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