Fine Art

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Crustacea
Superclassis: Multicrustacea
Classis: Malacostraca
Subclassis: Eumalacostraca
Superordo: Eucarida
Ordo: Decapoda
Subordo: Pleocyemata
Infraordo: Achelata
Familiae (2): Palinuridae – Scyllaridae
Name

Achelata
References

Palero, F. et al. 2009: Phylogenetic relationships between spiny, slipper and coral lobsters (Crustacea, Decapoda, Achelata). Molecular phylogenetics and evolution, 50(1): 152–162. DOI: 10.1016/j.ympev.2008.10.003

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 ἀ-, a- = "not", χηλή, chela = "claw"). They are further united by the great enlargement of the first antennae, by the special "phyllosoma" form of the larva, and by a number of other characters.[2]
Phyllosoma larva (micrograph)
Classification and fossil record

The infraorder Archelata belongs to the group Reptantia, which consists of the walking/crawling decapods (lobsters and crabs). The cladogram below shows Archelata's placement within the larger order Decapoda, from analysis by Wolfe et al., 2019.[3]

Decapoda

Dendrobranchiata (prawns) Litopenaeus setiferus.png

Pleocyemata

Stenopodidea (boxer shrimp) Spongicola venustus.png

Procarididea

Caridea (true shrimp) Macrobrachium sp.jpg

Reptantia (crawling/walking decapods)

Achelata (spiny lobsters, slipper lobsters) Panulirus argus.png

Polychelida

Astacidea (lobsters, crayfish) Lobster NSRW rotated2.jpg

Axiidea (mud shrimp, ghost shrimp, or burrowing shrimp)

Gebiidea

Anomura (hermit crabs and others) Coenobita variabilis.jpg

Brachyura (crabs) Charybdis japonica.jpg


Achelata contains the spiny lobsters (Palinuridae), the slipper lobsters (Scyllaridae) and the furry lobsters (Synaxidae, now usually included in Palinuridae),[4] as well as two extinct families, Cancrinidae and Tricarinidae.[1]
Extant families of Achelata
Palinurus elephas
Palinuridae
Palinurellus gundlachi
Palinuridae, formerly Synaxidae
Scyllarides latus
Scyllaridae

Both Palinuridae and Scyllaridae have a fossil record extending back to the Cretaceous.[5][6] The two fossil families contain a single genus each;[1] 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 341 million years ago.[8]
References

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.
Gerhard Scholtz; Stefan Richter (1995). "Phylogenetic systematics of the reptantian Decapoda (Crustacea, Malacostraca)" (PDF). Zoological Journal of the Linnean Society. 113 (3): 289–328. doi:10.1006/zjls.1995.0011.
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. (24 April 2019). "A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans". Proceedings of the Royal Society B. 286 (1901). doi:10.1098/rspb.2019.0079. PMID 31014217.
Ferran Palero; Keith A. Crandall; Pere Abelló; Enrique Macpherson; Marta Pascual (2009). "Phylogenetic relationships between spiny, slipper and coral lobsters (Crustacea, Decapoda, Achelata)". Molecular Phylogenetics and Evolution. 50 (1): 152–162. doi:10.1016/j.ympev.2008.10.003. PMID 18957325.
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" (PDF). Revista Mexicana de Ciencias Geológicas. 23 (3): 323–333.
Joachim T. Haug; Carolin Haug; Dieter Waloszek; Andreas Maas; Matthias Wulf; Günter Schweigert (2009). "Development in Mesozoic scyllarids and implications for the evolution of Achelata (Reptantia, Decapoda, Crustacea)" (PDF). Palaeodiversity. 2: 97–110.
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" (PDF). Journal of Paleontology. 81 (2): 405–407. doi:10.1666/0022-3360(2007)81[405:ANFGAS]2.0.CO;2. Archived from the original (PDF) on 2016-03-04. Retrieved 2012-02-05.
Keith A. Crandall; Megan L. Porter; Marcos Pérez-Losada (2009). "Crabs, shrimps and lobsters (Decapoda)". In S. Blair Hedges; Sudhir Kumar (eds.). The Timetree of Life. Oxford University Press. pp. 293–297. ISBN 978-0-19-160898-8.

Images

Biology Encyclopedia

Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License

Home - Hellenica World