Answer-Mytella strigata, recently seen in the news, is a:

Recently, the Southern Bench of the National Green Tribunal NGT has asked the Fisheries Department and the Tamil Nadu State Wetland Authority to file a detailed report on the removal of invasive mussel species Mytella strigata from Ennore-Pulicat wetland. Individual mussels have a diversity of external colour schemes from black, dark bluish, brown, grey, orange and rarely green. These mussels spread like a carpet over the river bottoms and thus preventing prawns from grazing or burying themselves in the sediment.