Gordonopsis Guinot & Richer de Forges 1995
Creators: name: Ng, Peter K. L.
name: Forges, Bertrand Richer de
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Homolidae
Gordonopsis

description: Key to species of Gordonopsis   
 1. Carapace and pereiopods covered with long dense setae which obscures surfaces and margins (Fig. 27 A–C); distal edge of dorsal margin of cheliped merus with 1 spine (Fig. 28E, G, H)..... Gordonopsis velutina, new species (Admiralty Islands)   
– Carapace and pereiopods glabrous, covered with short setae that may obscure surface or longer sparser setae that does not obscure surface (e.g., Figs. 2 A–C, 14A–C, 17A–C); distal edge of dorsal margin of cheliped merus with 2 spines (e.g., Figs. 3F, G, 15G).............................................................................2  
2. Latero-posterior margin of carapace with distinct tubercle or spine (e.g., Fig. 2A); outer margin of P2–P4 coxae unarmed, smooth.....................................................................................3  
– Latero-posterior margin of carapace with very low tubercle, barely visible (e.g., Fig. 17A); outer margin of P2–P4 coxae with a spine or tubercle (may be reduced or absent on some of articles) (e.g., Figs. 18J, K, 22I, J)....................................5  
 3. Carapace relatively narrower with lateral margins straighter, less convex (Fig. 9B); carpus of cheliped with 1 spine on each of outer and inner margins, dorsal ridge smooth, unarmed (Fig. 10F, G)......... Gordonopsis alaini, new species (Madagascar)   
– Carapace longitudinally ovate, with posterior part more globose, lateral margins distinctly convex (e.g., Fig. 2A); carpus of cheliped with 3 or more spines and spinules on each of outer and inner margins, dorsal ridge not armed with spines or spinules (e.g., Fig. 3F, G).......................................................4  
 4. Ambulatory legs long (Figs. 2A, 6A); distal part of P5 merus extending beyond gastric groove when folded anteriorly (Figs. 4A, 8A); dorsal ridge of carpus of cheliped with row of low granules (Figs. 3F, G, 7G); tip of G1 subtruncate (Figs. 4H, 8K)... Gordonopsis profundarum (Alcock & Anderson, 1899) (western Indian Ocean)   
 – Ambulatory legs short (Fig. 12A, B); distal part of P5 merus just reaching gastric groove when folded anteriorly (Fig. 12D); dorsal ridge of carpus of cheliped with row of low sharp tubercles (Fig. 13F); tip of G1 appears bifurcated (Fig. 13K)... Gordonopsis robusta Ng, Padate & Saravanane, 2019 (Andaman Sea)   
5. Supraorbital margin proportionately wider, pseudorostral spines relatively short, directed slightly obliquely laterally at angle of 20–30° (Figs. 14B, 15D, 17B)................................................6  
– Supraorbital margin C-shaped, less wide, pseudorostral spines long, directed almost 45° obliquely laterally (Figs. 21B, 24B).........................................................................................7  
 6. Carapace appears inflated when viewed laterally and frontally (Fig. 15A, B); P2–P4, particularly merus, proportionately shorter (Fig. 16 E–G, K, L); outer surface of P4 merus with 1 tubercle on proximal part (Fig. 16G, I)............... Gordonopsis pacifica Takeda & Suyama, 2019 (southern Japan)   
 – Carapace appears inflated when viewed laterally and frontally (Fig. 18A, B); P2–P4, particularly merus, proportionately longer (Fig. 19 D–F); outer surface of P4 merus unarmed, completely smooth (Fig. 19F)...... Gordonopsis hera, new species (Papua New Guinea)   
 7. Outer margin of each P3 and P4 coxa with 2 long spines each (Figs. 22I, J, 23B, H); outer surface of P4 merus with 1 perpendicular spine on proximal part... Gordonopsis phorcys, new species (Solomon Islands)   
 – Outer margin of each P3 and P4 coxa with 1 spine each (Fig. 26 B–D); outer surface of P4 merus unarmed, completely smooth..... Gordonopsis ceto, new species (South China Sea)
description: Published as part of Ng, Peter K. L. & Forges, Bertrand Richer de, 2020, A revision of the deep-sea porter crabs of the genus Gordonopsis Guinot & Richer de Forges, 1995 (Crustacea, Decapoda, Brachyura, Homolidae), with descriptions of five new species, pp. 267-307 in Raffles Bulletin of Zoology 68 on page 305, DOI: 10.26107/RBZ-2020-0023, http://zenodo.org/record/4576743