Phyllocarida.html



Leptostraca
Nebalia bipes
Scientific classification
Kingdom: Animalia Phylum: Arthropoda Subphylum: Crustacea Class: Malacostraca Subclass: Phyllocarida Packard, 1879 Order: Leptostraca Claus, 1880 1
Families
Nebaliidae Nebaliopsidae Paranebaliidae

Leptostraca (from the Greek words for thin and shell ²) is an order of small, marine crustaceans. Its members, including the well-studied Nebalia, occur throughout the world's oceans and are usually considered to be filter-feeders ³. It is the only extant order in the subclass Phyllocarida.

Description

Diagram of Nebalia bipes showing the major features of the external anatomy: 1: antennule; 2: rostrum; 3: carapace; 4: abdomen / pleon; 5: furca; 6: telson; 7: pleopods; 8: antenna; 9: thoracopods; 10: eye

Leptostracans are usually small (typically 5–15 mm long ⁴) possess a head with stalked compound eyes, two pairs of antennae (one biramous, one uniramous) and a pair of mandibles but no maxillipeds ³. The carapace is large and comprises two valves which cover the head and the thorax, including most of the thoracic appendages, and houses as a brood pouch for the developing embryos. The abdomen has eight segments, six of which bear pleopods, and a pair of caudal furcae, which may be homologous to uropods of other crustaceans ⁵.

Classification

It is now accepted that leptostracans belong to the Malacostraca ⁶, and the sister group to Leptostraca is Eumalacostraca ⁷.

The Order Leptostraca is divided into three families, with ten genera containing a total of around 40 valid described species ⁸:

Nebaliopsidae Hessler, 1984

• Nebaliopsis Sars, 1887
  • Nebaliopsis typica Sars, 1887
• Pseudonebaliopsis Petryachov, 1996
  • Pseudonebaliopsis atlantica Petryachov, 1996

Nebaliidae Samoulle, 1819

• Nebalia Leach, 1814
  • Nebalia antarctica Dahl, 1990
  • Nebalia bipes Fabricius, 1780
  • Nebalia borealis Dahl, 1985
  • Nebalia brucei Olesen, 1999
  • Nebalia cannoni Dahl, 1990
  • Nebalia capensis Barnard, 1914
  • Nebalia clausi Dahl, 1985
  • Nebalia falklandensis Dahl, 1990
  • Nebalia dahli Kazmi & Tirmizi, 1989
  • Nebalia daytoni Vetter, 1996
  • Nebalia geoffroyi Milne-Edwards, 1828
  • Nebalia gerkenae Haney and Martin, 2000
  • Nebalia herbstii Leach, 1814
  • Nebalia hessleri Martin et al., 1996
  • Nebalia ilheoensis Kensley, 1976
  • Nebalia kocatasi Kocak, Moreira and Katagan, 2007
  • Nebalia lagartensis Escobar & Villalobos-Hiriart, 1995
  • Nebalia longicornis Thomson, 1879
  • Nebalia marerubi Wägele, 1983
  • Nebalia patagonica Dahl, 1990
  • Nebalia schizophthalma Haney, Hessler, and Martin, 2001
  • Nebalia strausi Risso, 1826
  • Nebalia troncosoi Moreira, Cacbelos, and Dominguez, 2003
• Nebaliella Thiele, 1904
  • Nebaliella antarctica Thiele, 1904
  • Nebaliella brevicarinata Kikuchi and Gamô, 1992
  • Nebaliella caboti Clark, 1932
  • Nebaliella declivatas Walker-Smith, 1998
  • Nebaliella extrema Thiele, 1905
• Dahlella Hessler, 1984
  • Dahlella caldariensis Hessler, 1984
• Sarsinebalia Dahl, 1985
  • Sarsinebalia cristobi Moreira, Gestoso, and Troncoso, 2003
  • Sarsinebalia typhlops (Sars, 1870)
  • Sarsinebalia urgorrii Moreira, Gestoso, and Troncoso, 2003
• Speonebalia Bowman, Yager and Iliffe, 1985
  • Speonebalia cannoni Bowman, Yager and Iliffe, 1985

Paranebaliidae Walker-Smith and Poore, 2001

• Levinebalia Walker-Smith, 2000
  • Levinebalia maria Walker-Smith, 2000
  • Levinebalia fortunata (Wakabara, 1976)
• Paranebalia Claus, 1880
  • Paranebalia belizensis Modlin, 1991
  • Paranebalia longipes (Willemoes-Suhm, 1875)
• Saronebalia Haney and Martin, 2004
  • Saronebalia guanensis Haney and Martin, 2004

References

Wikispecies has information related to:

Leptostraca