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Medaeops serenei, new species. Holotype male. A, dorsal overall view; B, frontal view of carapace; C, ventral carapace view.
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Two new species of deep-water xanthid crabs, Euryxanthops chiltoni, new species, and Medaeops serenei, new species, are described from the Kermadec Islands, New Zealand. This is the first time these genera are reported from New Zealand. Keys for the identification of all species of Euryxanthops and Medaeops are provided. The two new species bring t...
Context in source publication
Context 1
... type species, M. granulosus, is the most widespread member of the genus and is actually the easiest species to diagnose. It is the only member of the genus with distinctly carinate ambulatory legs, especially along the margins of the meri, and its G1 is the stoutest, with the proximal two-thirds straight and stout, and the distal third more slender and lined with long setae nearer the tip (Guinot 1967 : Fig. 40). The other species of Medaeops have the meri of their ambulatory legs granulated or serrated, but never carinate. ...
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Citations
... 2d, 3d). The G1s of E. latifrons and E. chiltoni are not known as they are described only from females (Davie, 1997;Ng & McLay, 2007;Mendoza, 2010). The differences in the G1s are significant, and they should be separated into two genera once the genus is revised. ...
Two rare xanthid crabs of the genus EuryxanthopsGarth & Kim, 1983 were collected from Donggang fish port in southwestern Taiwan. Euryxanthops flexidentatusGarth & Kim, 1983, is recorded from Taiwan for the first time; this species was originally described from the Philippines on the basis of a single male. The taxonomy of a second species, E. orientalis(Sakai, 1939), is also treated and the variations in carapace form, in anterolateral margin armature, and in colour pattern are discussed. The known range of this species is also extended to southern Taiwan.
... Additional research in the New Zealand EEZ (Exclusive Economic Zone) has seen knowledge about the number of species of marine Crustacea increase during recent years. New species have been discovered, especially from the Kermadec area northeast of New Zealand (Webber & Takeda 2005;Takeda & Webber 2006; Komatsu & Takeda 2007;McLay 2007;Ng & McLay 2007;Schnabel 2009) and from seamounts and chemosynthetic habitats on the eastern side of New Zealand (Schnabel & Bruce 2006;Ahyong 2008). The new material reported here comes from the NIWA collection at Greta Point, including additional material from seamounts and chemosynthetic habitats, and from the Canterbury Museum. ...
... McLay (2007) recorded 2 new families associated with hydro-thermal vents near the Kermadecs, represented by Gandalfus puia McLay, 2007(Bythograeidae Williams, 1980 and Xenograpsus ngatama McLay, 2007(Xenograpsidae Ng, Davie, Schubart & Ng, 2007. From the same collections Ng & McLay (2007) Ng & McLay, 2007(Xanthidae Macleay, 1838 and Medaeops serenei Ng & McLay, 2007(Xanthidae Macleay, 1838) from the Macauley Caldera north of the Kermadec Is. ...
... McLay (2007) recorded 2 new families associated with hydro-thermal vents near the Kermadecs, represented by Gandalfus puia McLay, 2007(Bythograeidae Williams, 1980 and Xenograpsus ngatama McLay, 2007(Xenograpsidae Ng, Davie, Schubart & Ng, 2007. From the same collections Ng & McLay (2007) Ng & McLay, 2007(Xanthidae Macleay, 1838 and Medaeops serenei Ng & McLay, 2007(Xanthidae Macleay, 1838) from the Macauley Caldera north of the Kermadec Is. ...
Seven species and two families previously unknown from New Zealand are recorded: Dynomene pilumnoides Alcock, 1900, Metadynomene tanensis (Yokoya, 1933) (Dynomenidae new to New Zealand); Pseudopalicus undulatus Castro, 2000 (Palicidae); Mursia microspina Davie & Short, 1989 (Calappidae new to New Zealand); Ovalipes elongatus Stephenson & Rees, 1968, Thalamita danae Stimpson, 1858, (Portunidae); Percnon planissimum (Herbst, 1804) (Plagusiidae); Ontogenetic morphological changes in Nectocarcinus antarcticus (Portunidae) are described. The southern limit for Pseudopalicus undulatus is extended from Fiji to New Zealand and the depth limit from 410 m to more than 560 m. A checklist of Brachyura recorded from the Kermadec Is is also updated. The genus Dromia Weber, 1795 (Dromiidae) is revised and restricted to the Atlantic Ocean (6 species) and Metadromia gen. nov. and Tumidodromia gen. nov., are erected for Indo-West Pacific species previously included in Dromia sensu lato. A new species of Rochinia (Epialtidae) is described from the Rumble V seamount. The stridulatory ridges on the chelipeds of Ocypode (Ocypodidae), important for identification, are shown to be sexually dimorphic: males have more striae than females. A single specimen of O. pallidula is reported from the Leigh Marine Reserve where it may have been accidentally released.
... There are currently 24 genera and 83 species in the xanthid crab subfamily Euxanthinae worldwide, with most occurring in the Indo-Pacifi c (Ng & McLay, 2007;Ng et al., 2008). Euxanthine crabs are distinguished from other xanthids mainly by having a carapace anterolateral margin that does not meet the exorbital angle, but instead, continues (distinctly or feebly) down across the subhepatic region toward the buccal frame (Serène, 1984;Ng, 1993Ng, , 2002Davie, 2002;Ng et al., 2008). ...
Two new genera and four new xanthid crab species belonging to the subfamily Euxanthinae Alcock (Crustacea: Decapoda: Brachyura) are described from the Bohol Sea, central Philippines. Rizalthus, new genus, with just one species, R. anconis, new species, can be distinguished from allied genera by characters of the carapace, epistome, chelipeds, male abdomen and male fi rst gonopod. Visayax, new genus, contains two new species, V. osteodictyon and V. estampadori, and can be distinguished from similar genera using a combination of features of the carapace, epistome, thoracic sternum, male abdomen, pereiopods and male fi rst gonopod. A new species of Hepatoporus Serène, H. pumex, is also described. It is distinguished from congeners by the unique morphology of its front, carapace sculpturing, form of the subhepatic cavity and structure of the male fi rst gonopod.
The xanthid genus Medaeops Guinot, 1967 currently contains seven species reported from the Indo-West Pacific region. However, only one species, Medaeops granulosus (Haswell, 1882), has been recorded from China seas and was once thought to be widespread in the Indo-West Pacific region. In this study, two species of the Medaeops granulosus species-group were identified during the analysis on Medaeops crabs from China seas. Medaeops japonicus (Rathbun, 1898), which had previously been considered a junior synonym of M. granulosus, is shown to be a distinct species that can be distinguished from M. granulosus by the lower first anterolateral tooth, the larger and concentrated granules on carapace dorsally, and the different shape of the male’s first gonopod. In addition, a new recorded species, Medaeops edwardsi Guinot, 1967, was reported from China seas for the first time. A molecular analysis was conducted to determine the status of each species, and an updated key for species of the genus Medaeops was provided.
At least 2086 species from 729 families are reported from the insular shelf and upper slope of the
Kermadec Islands Marine Reserve and north Kermadec Ridge. The best known groups are benthic
Foraminifera, benthic macroalgae, Cnidaria, Mollusca, Crustacea, Bryozoa, Echinodermata, fishes
and sea birds. However knowledge of the region’s biota remains superficial and even amongst
these groups new species records are commonplace. Bacteria, most planktonic groups, sessile
invertebrates (particularly Porifera and Ascidiacea), infaunal and interstitial invertebrates, and
parasites are largely unstudied.
Deepwater crabs from seamounts and chemosynthetic habitats off eastern New Zealand are reported. Of the 30 species reported, eight are new to science: Cymonomus clarki sp. nov. (Cymonomidae), Dicranodromia delli sp. nov. (Homolodromiidae), Ethusina castro sp. nov. and E. rowdeni sp. nov. (Dorippidae), Trichopeltarion janetae sp. nov. (Atelecyclidae), Mathildella mclayi (Mathildellidae), Neopilumnoplax nieli sp. nov. (Mathildellidae), and Garthambrus tani sp. nov. (Parthenopidae). The dorippids, parthenopids and mathidellids reported here are the first members of these families to be described from New Zealand. Three previously described species are recorded for the first time from New Zealand waters: Dicranodromia spinulata Guinot, 1995 (Homolodromiidae), Intesius richeri Crosnier & Ng, 2004 (Mathildellidae) and Miersiograpsus australiensis Türkay, 1978 (Plagusiidae). The majority of brachyurans from New Zealand seamounts and chemosynthetic habitats are 'typical' deepwater forms of which thirteen species are presently unique to New Zealand. At species level, 43% of the seamount and cold-seep brachyurans are apparent New Zealand endemics, with strongest affinities with the eastern Australian fauna (37%). At the generic level, however, congeners of most species reported herein occur widely in the Indo-West Pacific (including eastern Australia and New Caledonia), suggesting that the New Zealand seamount and cold-seep brachyuran fauna is an extension of the tropical Indo-West Pacific fauna. Thirty-three percent (10 of 30 species) of the known New Zealand seamount and cold-seep brachyurans have only been recently discovered indicating that species richness is probably strongly underestimated. A key to the Brachyura known from New Zealand seamounts and chemosynthetic habitats is given.
