Themisto Oken 1815
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 marg...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2004
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| Online Access: | https://doi.org/10.5281/zenodo.5030021 http://treatment.plazi.org/id/03931615EC6BFFEAFEDFFCDCFAB8F957 |
| Summary: | 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 |
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