Pachynus, Bulycheva, 1955

Lowry, J. K. & Stoddart, H. E., 2012, The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246, Zootaxa 3246 (1), pp. 1-69: 38

publication ID

http://doi.org/ 10.11646/zootaxa.3246.1.1

DOI

http://doi.org/10.5281/zenodo.5251248

persistent identifier

http://treatment.plazi.org/id/456087D3-3600-FFAC-B8DF-09BAFA1D4C88

treatment provided by

Felipe

scientific name

Pachynus
status

 

Key to species of Pachynus  

1. Gnathopod 1 subchelate or only slightly chelate............................................................. 2

- Gnathopod 1 chelate................................................................................... 3

2. Maxilla 1, outer plate with 4/3 setal-tooth arrangement. Antenna 1 accessory flagellum absent. Pereopod 4 merus produced anteroventrally beyond carpus................................................................ P. obsolescens  

- Maxilla 1, outer plate with 5/3 setal-tooth arrangement. Antenna 1 accessory flagellum 2-articulate. Pereopod 4 merus produced anteroventrally less than halfway along carpus................................................ P. pugilator  

3. Antenna 1 accessory flagellum 2-articulate. Pereopod 7 basis about as long as wide................................. 4

- Antenna 1 accessory flagellum absent. Pereopod 7 basis about 1.5 × as long as wide................... P. denticulatum  

4. Mandible, molar absent. Gnathopod 2 propodus, length less than 2 × breadth............................. P. barnardi  

- Mandible, molar present. Gnathopod 2 propodus, length more than 2 × breadth............................ P. chelatum