Themisto Oken 1815

• Main Author: Zeidler, Wolfgang
• Format: Text
• Language: unknown
• Published: Zenodo 2004
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Hyperiidae; Themisto; Arctic; New Zealand; Pacific; North Atlantic; Subarctic
• Online Access: https://dx.doi.org/10.5281/zenodo.5030021; https://zenodo.org/record/5030021

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 : Published as part of Zeidler, Wolfgang, 2004, A review of the families and genera of the hyperiidean amphipod superfamily Phronimoidea Bowman & Gruner, 1973 (Crustacea: Amphipoda: Hyperiidea), pp. 1-66 in Zootaxa 567 on page 28, DOI: 10.11646/zootaxa.567.1.1, http://zenodo.org/record/5259734 : {"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."]}