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| Macromedaeus adelus Mendoza, 2021 RAFFLES BULLETIN OF ZOOLOGY. 69 |
Abstract
Four species of marine crab (Brachyura) are reported for the first time from Singapore. Three of these have been previously reported from other localities in the Indo-West Pacific region, while one is a new species described herein. The camptandriid crab, Exagorium fidelisi Naruse, Chung & Tangah, 2015, originally described from northeastern Sabah, Malaysia, is reported from the mangroves of northern Singapore. Two xanthid crabs are newly recorded as well: Hepatoporus guinotae (Zarenkov, 1971) and Medaeops edwardsi Guinot, 1967, previously described from the Red Sea and Indian Ocean, respectively. Another xanthid crab, Macromedaeus adelus, new species, is described from the intertidal areas of Singapore. It is most similar to M. distinguendus (De Haan, 1835) and M. voeltzkowi (Lenz, 1905), primarily in having a distinctly areolated and granular carapace and having four teeth on the carapace anterolateral margin. It can, however, be distinguished from congeners by morphological features of the carapace, chelipeds, ambulatory legs, and the male first gonopods.
Key words. Xanthidae, Camptandriidae, taxonomy, biodiversity, Macromedaeus adelus, Hepatoporus, Exagorium
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| Live colouration. Macromedaeus adelus, new species (ZRC 2017.0466), West Coast Park, Singapore. A, paratype, male, 16.0 × 10.3 mm; B, paratype, male, 11.8 × 7.7 mm. Scale bar: A, B = 5.0 mm. |
Macromedaeus adelus, new species
Etymology. The specific epithet of the new species is derived
from the Greek “adelos”, meaning “unseen, unknown, and
obscure”, because the true identity of this crab remained
concealed for many decades. Used as a Latin adjective.
Jose Christopher E. Mendoza. 2021. Marine Crabs new to Singapore, with A Description of A New Species of intertidal xanthid crab of the Genus Macromedaeus Ward, 1942 (Crustacea: Decapoda: Brachyura). RAFFLES BULLETIN OF ZOOLOGY. 69: 463–480. [5 November 2021]
