Revision of Garthiella Titgen, 1986 (Crustacea: Decapoda: Brachyura: Xanthidae), with description of a new subfamily and a new species from the central Philippines

Abstract

Examination of the holotype and other specimens of the type species of Garthiella Titgen, 1986, G. aberrans (Rathbun,1906), reveals that this genus must be excluded from Chlorodiellinae Ng & Holthuis, 2007, due to the absence of thediagnostic morphological features of the subfamily such as spoon-tipped chelae, prominent dactylo-propodal locks on theambulatory legs, and subdistal teeth on the ambulatory dactyli. Garthiellinae subfam. nov. is therefore established for thisgenus, as molecular and morphological evidence show that it cannot be classified in any other subfamily of XanthidaeMacLeay, 1838. A new species of Garthiella from the Bohol Sea, central Philippines, is also described. Garthiellasikatuna sp. nov. can be distinguished from G. aberrans by its relatively flatter and less granular carapace, more pronounced and curved anterolateral teeth, longer and more slender pereopods and by the form of the male first gonopods.

Phylogeny of eriphioid crabs (Brachyura, Eriphioidea) inferred from molecular and morphological studies

“…This resulted in a number of new character suites being uncovered, which allowed many of the groups to be redefined to better reflect natural groupings (e.g. Mendoza & Guinot ; Mendoza & Manuel‐Santos ). Although recent systematic reviews have increased subdivision within the taxa formerly attributed to the superfamily Xanthoidea (Guinot ; Serène ; Martin & Davis ; Davie ; Števčić ; Karasawa & Schweitzer ; Ng et al .…”

Harryplax severus, a new genus and species of an unusual coral rubble-inhabiting crab from Guam (Crustacea, Brachyura, Christmaplacidae)

“…suture 5/6 is the suture between sternites 5 and 6). Terminology essentially follows that of Mendoza and Manuel-Santos (2012), Mendoza et al (2012), and Naruse and Ng (2014).…”

Phylogenetic relationships of the ubiquitous coral reef crab subfamily Chlorodiellinae (Decapoda, Brachyura, Xanthidae)

“…The 50 described species, in eight genera, of chlorodielline crabs (Xanthidae) are widely distributed throughout the tropical and subtropical Indian and Pacific oceans, with one western Atlantic representative (Ng et al . ; Mendoza & Manuel‐Santos ; Lasley et al . ).…”

“…Cymo , Cymoinae; Leptodius , Xanthinae; Etisus , Etisinae; Kraussia , Kraussiinae; and Garthiella , Garthiellinae) (Ng et al . ; Mendoza & Manuel‐Santos ). Furthermore, the closest relatives of Chlorodiellinae, namely Etisinae, are polyphyletic and defined by morphological characters of doubtful homology, making generic assignment based on common ancestry difficult (Ng et al .…”

“…Three monotypic genera were subsequently assigned to this group: Sulcodius Clark & Ng, ; Vellodius Ng & Yang, ; and Garthiella Titgen, . The latter genus was eventually elevated to a monotypic subfamily (Mendoza & Manuel‐Santos ). The monotypic genera Sulcodius and Vellodius were compared to Cyclodius , Pilodius and Chlorodiella in their original descriptions (Ng & Yang ; Clark & Ng ).…”