Which is the largest known of these invertebrates?
Largest organisms of all invertebrates (in terms of mass) are the largest squids. The colossal squid ("Mesonychoteuthis hamiltoni") is projected to be the largest invertebrate. Current estimates put its maximum size at long and , based on analysis of smaller specimens. In 2007, authorities in New Zealand announced the capture of the largest known colossal squid specimen. It was initially thought to be and . It was later measured at long and in weight. The mantle was long when measured. The giant squid ("Architeuthis dux") was previously thought to be the largest squid, and while it is less massive and has a
Largest known prime number the progression of the largest known prime number in ascending order. Here M = 2 − 1 is the Mersenne number with exponent "n". The longest record-holder known was M = 524,287, which was the largest known prime for 144 years. No records are known before 1456. GIMPS found the fourteen latest records (all of them Mersenne primes) on ordinary computers operated by participants around the world. A list of the 5,000 largest known primes is maintained by Chris K. Caldwell, of which the twenty largest are listed below. Largest known prime number The largest known prime number () is