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...

Full description

Bibliographic Details
Main Author: Zeidler, Wolfgang
Format: Other/Unknown Material
Language:unknown
Published: 2004
Subjects:
Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Hyperiidae
Themisto
Arctic
Pacific
New Zealand
North Atlantic
Subarctic
Online Access:https://zenodo.org/record/5030021
https://doi.org/10.5281/zenodo.5030021
Description
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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