Abstract
A second species of the previously monotypic aphanodactylid crab genus Gustavus Ahyong & Ng, 2009 is described from the Red Sea coast of Saudi Arabia. The new species, Gustavus holthuisae sp. nov., inhabits the tubes of terebellid polychaetes near mangrove roots. It can be distinguished from the type species from Guam, Gustavus mecognathus Ahyong & Ng, 2009, by the structure of the dorsal surface of the carapace, the proportions and form of the frontal margin, the shape of the third maxilliped, the armature of the basis-ischium and merus of the third and fourth ambulatory legs, and the structure of the male pleon and gonopods.
Reference20 articles.
1. Ahyong, S.T. & Ng, P.K.L. (2009) Aphanodactylidae, a new family of thoracotreme crabs (Crustacea: Brachyura) symbiotic with polychaete worms. Zootaxa, 2289 (1), 33–47. https://doi.org/10.11646/zootaxa.2289.1.3
2. Borradaile, L.A. (1903) Marine Crustaceans. IV. Some Remarks on the Classification of the Crabs. V. The Crabs of the Catometope Families. VI. The Sand Crabs (Oxystomata). VII. The Barnacles (Cirripedia). In: Gardiner, J.S. (Ed.), The Fauna and Geography of the Maldive and Laccadive Archipelagoes: Being the Account of the Work carried on and of the Collections made by an Expedition during the years 1899 and 1900, 1, pp. 424–443.
3. Castro, P. (2015) Symbiotic Brachyura. In: Castro, P., Davie, P.J.F., Guinot, D., Schram, F.R. & Vaupel Klein, J.C. von (Eds.), Decapoda: Brachyura, Treatise on Zoology – Anatomy, Taxonomy, Biology. The Crustacea. Vol. 9. Part C-I. Decapoda: Brachyura (Part 1), Brill, Leiden, pp. 543–581. https://doi.org/10.1163/9789004190832_012
4. Chow, L.H., Ahyong, S.T., Tsang, C.T.T., Lam, Y.F., Naruse, T., Ng, P.K.L. & Tsang, L.M. (2023) Shift in symbiotic lifestyle as the major process shaping the evolution of pea crabs (Decapoda: Brachyura: Pinnotheroidea). Molecular Phylogenetics & Evolution, 188, 1–13. https://doi.org/10.1016/j.ympev.2023.107904
5. Dana, J.D. (1851) Conspectus Crustaceorum quae in Orbis Terrarum circumnavigatione, Carolo Wilkes e Classe Reipublicae Foederatae Duce, lexit et descripsit J.D. Dana. Pars VI. American Journal of Science and Arts, Series 2, 11, 268–274.