Themisto Oken 1815
Creators
Description
Key to the species of the genus Themisto
1. Pereopod 5 not longer than P6 or P7........................................................................... 2
Pereopod 5 much longer than P6 or P7........................................................................ 5
2. Maxilliped without row of setae on distal margin of basal plate (arctic and subarctic of Atlantic)............................................................................. T. abyssorum (Boeck, 1871)
Maxilliped with row of setae on distal margin of basal plate..................................... 3
3. Pereopods 5 & 6; dactylus smooth. Antenna 1 of female hooked, stout (colder waters of Australia and New Zealand) T. australis (Stebbing, 1888)
Pereopods 5 & 6; dactylus with setae at base. Antennae 1 of female straight, tapering (North Pacific)............................................................................................................. 4
4. Antennae 2 of females longer than A1. Adult females reach 9–17 mm in length. Pereopod 3 with 6–8 (usually 7) robust setae on posterior margin of carpus...................... .......................................................................................... T. japonica (Bovallius, 1887)
Antennae 2 of females equal in length to A1. Adult females reach 5–9 mm in length. Pereopod 3 with 3–5 (usually 4) robust setae on posterior margin of carpus................ ........................................................................................... T. pacifica (Stebbing, 1888)
5. Pereopod 7 usually longer than P6, but shorter than P5. Gnathopod 2; merus with relatively straight distal margin,anterodistal corner produced into small tooth(North Atlantic) ................................................................................................. T. compressa Goës, 1865
Pereopod 6 & 7 subequal in length. Gnathopod 2; merus with rounded distal margin 6
6. Pereopods 3–7; dactylus with setae on basal part (arctic and subarctic)........................ ....................................................................... T. libellula (Lichtenstein in Mandt, 1822)
Pereopods 3–7; dactylus smooth (colder waters of southern oceans)............................. ......................................................................................... T. gaudichaudii Guérin, 1825
Notes
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Hyperiidae
- Genus
- Themisto
- Kingdom
- Animalia
- Order
- Amphipoda
- Phylum
- Arthropoda
- Scientific name authorship
- Oken
- Taxon rank
- genus
- Taxonomic concept label
- Themisto Oken, 1815 sec. Zeidler, 2004
References
- Boeck, A. (1871) Crustacea Amphipoda Borealia et Arctica. Forhandlinger i Vedenskabs-Selskabet i Christiana Aar, 1870, 81 - 280 (1 - 200).
- Stebbing, T. R. R. (1888) Report on the Amphipoda collected by H. M. S. ' Challenger' during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. ' Challenger' during the years 1873 - 76 Zoology, 29, i - xxiv + 1 - 1737, pls 1 - 210.
- Bovallius, C. (1887) Systematical list of the Amphipoda Hyperiidea. Bihang till Kungliga Vetenskaps-Akademiens Handlingar, 11 (16), 1 - 50.
- Goes, A. T. (1865) Crustacea amphipoda maris Spetsbergiam alluentis cum speciebus aliis arcticis enumerat. Ofversigt af Kongelige Vetenskaps-Akademiens Forhandlingar 1865, 8, 517 - 536, pls 36 - 41. (Reprint, pp. 1 - 20).
- Mandt, M. A. (1822) Observationes in historium naturalem et anatomiam comparatum in itinere Groenlandico factae, Dissertatio inauguralis. Berlin, 40 pp.
- Guerin, F. E. (1825) Encyclopedie Methodique Histoire Naturelle. Entomologie, ou histoire naturelle des Crustaces, des Arachnides et des Insectes par M. Latreille. Tome 10. Paris.