Gustavus Ahyong & Ng, 2009

Ng, Peter K. L. & Anker, Arthur, 2024, A second species in the polychaete-associated crab genus Gustavus Ahyong & Ng, 2009 (Decapoda: Brachyura: Aphanodactylidae), Zootaxa 5497 (3), pp. 369-380 : 370

Gustavus Ahyong & Ng, 2009

Type species. Gustavus mecognathus Ahyong & Ng, 2009 .

Other species included. Gustavus holthuisae sp. nov.

Remarks. Števčić (2011) recognised a new tribe, Gustavini , placing it under the Aphanodactylinae in his concept of Asthenognathidae Stimpson, 1858. Whereas the morphological features of Gustavus , in particular the somewhat peculiar Mxp3, are unusual within Aphanodactylidae , members of this family are so diverse in form that a suprageneric grouping just for Gustavus would not be taxonomically meaningful, even with discovery of a second species of the genus (described below). In addition, the subtriangular Mxp3 ischium of Gustavus , being slender and distinctly tapering proximally, is a feature also present in Takedactylus Naruse & Maenosono, 2012 . Takedactylus , however, has a completely different carapace form and much longer walking legs, the latter also with a distinctive dactylus armed with an accessory spine (cf. Naruse & Maenosono 2012; Naruse & Yoshida 2018).