Additions to the Indonesian fauna of the hermit crab genus Pseudopaguristes McLaughlin and a further division of the genus Paguristes Dana (Crustacea: Decapoda: Paguroidea: Diogenidae)

Abstract

An in-depth study of the genera Paguristes Dana, 1851 and Pseudopaguristes McLaughlin, 2002 in Indonesian waters has resulted in refined hypotheses of some of the evolutionary trajectories within the Paguroidea. Not only has the observed reduction in pleurobranch and arthrobranch number in three species, Paguristes hians Henderson, 1888, P. kuekenthali De Man, 1902 and P. monoporus Morgan, 1987 required the transfer of these taxa to Pseudopaguristes, they, and two new species, have required an emendation of the genus itself. Additionally, the investigation has also revealed anintermediate evolutionary change that heretofore has gone unrecognized. In several, apparently less derived, representatives of Paguristes, the characteristic gill number of 13 pairs (ten of arthrobranchs and three pleurobranchs) has been reduced to 12, with the loss of the pleurobranch on the wall of fifth thoracic somite. Only one of these recognized species, Paguristes tuberculatus Whitelegge, 1900, occurs in Indonesian waters. The genus Stratiotes, Thomson, 1899, erected for Pagurus setosus Filhol, 1885, a junior synonym of Paguristes setosus (H. Milne Edwards, 1848), is reinstated because its type species has proved to have 12 pairs of gills. Three new species are included in Stratiotes: S. micheleae n. sp., S. breviantennatus n. sp., and S. ngochoae n. sp. The new species assigned to Pseudopaguristes are P. asper n. sp. and P. gracilis n. sp.

Redescription and taxonomic status of Paguristes praedator Glassell, 1937 and P. oxyophthalmus Holthuis, 1959 (Anomura: Paguroidea: Diogenidae), with an emendation to the diagnosis of the genus Areopaguristes Rahayu & McLaughlin, 2010

“…Although the nine species originally described in Areopaguristes have been documented in detail, several of the species reassigned from Paguristes sensu lato have remained poorly diagnosed or insufficiently illustrated (see Rahayu 2005).…”

“…exhibit several significant characters (e.g., absence of epipod on first maxilliped, and lack of spines on ventral margins of dactyls of second and third pereopods) that were not considered in the original diagnosis of the genus Areopaguristes or mentioned in descriptions of these two species. Furthermore, Ayón-Parente & Hendrickx (2006Hendrickx ( , 2012 previously found that three eastern Pacific species (A. mclaughlinae, A. lemaitrei, and A. waldoschmitti) differ in important characters such as lack of first pleopods in females, from other congeners known from the Indo-West Pacific and western Atlantic (Rahayu 2005, McLaughlin 2008, Komai 2009, 2010, Lemaitre & Felder 2012. Thus, the need fulfilled in this study to emend the diagnosis of Areopaguristes.…”

“…Despite various revisions and descriptions of new species published since first Stratiotes Thomson, 1899 and then Areopaguristes (a replacement name for the preoccupied Stratiotes Thomson, 1899) were proposed for species previously in Paguristes sensu lato with 12 pairs of gills instead of 13, this group of diogenids (i.e., Paguristes sensu stricto, Areopaguristes) has remained one of the most taxonomically and morphologically problematic in the Paguroidea (e.g., Hendrickx & Harvey 1999;Rahayu 2005;Ayón-Parente & Hendrickx 2006Komai 2009Komai , 2010McLaughlin 2008;Lemaitre & Felder 2012). In the eastern tropical Pacific, several new species of Areopaguristes, and a morphologically similar genus, Tetralobistes Ayón-Parente & Hendrickx, 2010, have been described, and taxonomic problems in various taxa resolved (Ayón-Parente & Hendrickx 2006, 2010b.…”

New taxonomic and distributional information on hermit crabs (Crustacea: Anomura: Paguroidea) from the Gulf of Mexico, Caribbean Sea, and Atlantic coast of South America

“…List of Paguroidea known from the Brazilian coast. [1, species present in Brazil collections reported herein; 2, previously reported as Paguristes oxyophthalmus, see Ayón-Parente et al (2015); 3, previously confused in Brazil under C. vittatus (Bosc, 1802), see Negri et al( 2014); 4, mentioned in Coelho et al (2007) as Petrochirus insignis under Dardanus venosus, 5, previously reported as Paguristes calliopsis, see Rahayu (2005)]. …”

Hermit crabs (Crustacea: Anomura: Paguroidea) of the Dampier Archipelago, Western Australia

“…rIlL' hierarchical classification used follows that of Martin and Davis (2001); the division of the genus Paguristes Dana, 1851 is that of Rahayu (2005). The shield length (sI), as measured from the tip of the rostrum or midpoint of the rostra I lobe (exclusive of the intercalary rostra I process of [)iogenes species) to the midpoint of the posterior margin of the shield provides an indication of animal size.…”