A new species of crab has been identi fied from Goa’s mangrove ecosystem after scientists re-examined preserved specimens that had long been misidentified, in a discovery that highlights both the rich ness of coastal biodiversity and the con tinuing impor tance of taxo nomic research. The spe cies, named Chhapgarus ngankeeae, was identified by zoologist Sameer Kumar Pati of the Zo ological Survey of India follow ing a detailed re-evaluation of specimens housed in the National Zoo logical Collec tions. The sam ples, originally collected from Goa as well as parts of Karna taka and Maharashtra, had earlier been classified as Chhapgarus intermedius.
The breakthrough came when subtle but consistent differences were observed during microscopic exam ination. These distinctions confirmed that the spec imens did not belong to the previously identified species but represented a distinct and previously un documented crab. The holotype specimen — the reference used to formally describe the spe cies — was collected from the muddy backwaters of the Galgibag River in South Goa, where it was found beneath a stone, placing Goa at the centre of the dis covery and reinforcing the ecological significance of its mangrove habitats. Measuring about 1.6 cm in width, the crab is rela tively small but exhibits defining anatomical fea tures. Researchers point ed to differences in the abdominal structure and tail region, along with a uniquely shaped male re productive organ, which is a key criterion used in crab classification.
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The species has been named in honour of the late Dr Ngan Kee Ng, a not ed marine biologist from the National University of Singapore, in recognition of her contributions to crustacean taxonomy. Scientists say the finding demonstrates how pre served specimens, some of which may have been collected years or even decades ago, can still yield new discoveries when ex amined with greater pre cision. It also highlights how Goa’s mangrove eco systems remain underex plored despite their eco logical importance. Mangrove crabs play a crucial role in coastal eco systems by recycling nutri ents and supporting food chains. Researchers believe that continued study of such habitats could lead to the identification of more un documented species along India’s western coast, even as concerns persist over pressures on mangroves from development and envi ronmental degradation.
