Tmetonyx Stebbing 1906
- Dataset
- A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae)
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Amphipoda
- family
- Uristidae
- genus
- Tmetonyx
description
(Fig. 48)
discussion
Remarks. Based on the subchelate gnathopod 1 with a fully developed coxa and long carpus Tmetonyx appears to be similar to Anonyx and Caeconyx. Tmetonyx differs from Anonyx in the accessory flagellum cap (present in Anonyx and Caeconyx), the mandibular molar (setose with a vestigial triturating surface in Anonyx and Caeconyx), gnathopod 1 ischium (short in Anonyx and Caeconyx).
distribution
Distribution. Atlantic Ocean: North Atlantic; North Polar Sea; Mediterranean Sea.
type_taxon
Type species. Oniscus cicada O. Fabricius, 1780, original designation. Included species. Tmetonyx includes 8 species: T. acuta (G. O. Sars, 1891); T. albida (G. O. Sars, 1891); T. cicada (O. Fabricius, 1780); T. gulosa (Krøyer, 1845); T. leucophthalma (G. O. Sars, 1891); T. nardonis (Heller, 1867); T. palpiserrata Bellan-Santini, 1985; T. rotundata (Chevreux, 1926 a); T. similis (G. O. Sars, 1891). Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 with weakly developed brush setae. Mandible molar a reduced column with convex, fully triturating surface. Maxilla 1 outer plate a well developed 7 / 4 crown. Maxilla 2 inner plate significantly shorter than outer plate. Gnathopod 1 subchelate; coxa 1 large, about as long as coxa 2, subrectangular with straight anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth); propodus margins subparallel. Uropod 2 inner ramus not constricted. Telson deeply cleft.
Name
- Homonyms
- Tmetonyx Stebbing 1906