In a shadowed limestone tunnel in Vietnam’s Ha Long Bay, a diver reaches into the dark and lifts out a pale green lump.<\/p>\n
It looks like an ordinary sponge, the kind seen on any reef.<\/p>\n
It is not.<\/p>\n
The blob turns out to be a species science had never properly named.<\/p>\n
And the same creature was already sitting in museum drawers an ocean away.<\/p>\n
So how does a sponge hide from the very people who collect it?<\/p>\n
When the lab work came back, the surprise was not the green sponge from the tunnel. It was that specimens pulled years earlier from reefs in Hawaii and Thailand<\/strong>, filed under a completely different name, turned out to be the exact same species<\/strong>. Three widely separated collections, one animal. The sites span thousands of miles of ocean, yet the sponge is genetically identical across all three.<\/p>\n The trick was color.<\/p>\n In the Vietnamese cave the sponge grows a soft green. In the Pacific collections the same species had come up in blue, gray and violet<\/strong>, so nobody guessed the two were related. Only the genetics tied them into a single thread<\/strong>.<\/p>\n The clear specimen came from an odd little world. Divers found it in a shadowed rock tunnel<\/strong> linked to a saltwater lake ringed by limestone, sitting in just seven to thirteen feet<\/strong> of water. In that dim, sheltered passage the sponge had grown to about 8 inches<\/strong> across, shaped like a cluster of stubby tubes.<\/p>\n Ha Long Bay is riddled with these drowned karst basins, pools half sealed off from the open sea, and they shelter oddities that rarely turn up on ordinary reefs.<\/p>\n That setting is why it stood out. Cut off from open surf and bright reef, the tunnel sponge kept a clean, even green tint<\/strong> that looked plainly different from anything on the catalog shelves. It was the living, brightly colored version that finally gave the game away.<\/p>\n Eight specimens went to the lab in all.<\/p>\n Sponges are among the hardest animals to name. They have no fixed shape, no real skeleton, and their color and form<\/strong> shift with depth, light and current. Two sponges of one species can look like strangers, and two strangers can look alike. For over a century, naming them has leaned on tiny glassy skeletal needles called spicules, visible only under a microscope, and even those can overlap between close species.<\/p>\n Preserved specimens make it worse. Once a sponge is pulled from the sea and dropped in alcohol, it often loses its color<\/strong> and slumps into a shapeless mass on the shelf. A curator working from a faded lump has very little to go on.<\/p>\n So the wrong label sticks for years.<\/p>\n That is exactly how the Hawaiian and Thai specimens ended up misfiled, sorted by eye into a neighboring species<\/strong> that they merely resembled. The mistake was reasonable, and it was still a mistake, invisible until someone read the genes<\/strong>.<\/p>\n The team leaned on what biologists call integrative taxonomy, matching physical features<\/strong> against genetic ones. They sequenced several stretches of DNA from each specimen and ran statistical models that sort samples into true species<\/strong>, the same careful cross checking behind an offshore wind<\/a> survey.<\/p>\n The genes were blunt. The green Vietnamese sponge and the faded Pacific ones fell into one clean cluster<\/strong>, and the name they had carried before simply did not fit. The delimitation models drew the same boundary the eye had missed, splitting off the old catch all label and pulling these specimens firmly onto their own branch.<\/p>\n The researchers gave the species a fresh name<\/strong>, honoring a veteran sponge taxonomist<\/a>. One author said the work “expands the knowledge of species distribution along iconic hotspots of the Indo Pacific Oceans” and should inspire more research.<\/p>\n The bigger lesson is about how little we have counted. Museum drawers around the world hold untold sponge specimens<\/strong>, many labeled by sight decades ago and never checked against DNA. Some unknown share of them are almost certainly filed wrong. Scientists have formally described roughly nine thousand sponge species, and many suspect a large slice of that diversity is still sitting unnamed in jars.<\/p>\n Sponges are worth the trouble. They sit still and filter seawater<\/strong> all day, cycling nutrients that reefs and fish rely on, so a miscounted sponge is a small hole in the whole ledger of a reef.<\/p>\n The same study named a second one.<\/p>\n A purple, fan shaped sponge from Indonesian waters<\/strong> was described in the very same paper, which, contrary to how these finds are often locked away, is free to read<\/a>. Discovery here looks less like a dive and more like a fox wandering back onto solar panels<\/a>, life turning up where nobody was looking<\/strong>.<\/p>\n The tunnel sponge was there all along. It just needed someone to read it right.<\/p>\n","protected":false},"excerpt":{"rendered":" In a shadowed limestone tunnel in Vietnam’s Ha Long Bay, a diver reaches into the dark and lifts out a pale green lump. It looks like an ordinary sponge, the kind seen on any reef. It is not. The blob turns out to be a species science had never properly named. And the same creature … Read more<\/a><\/p>\n","protected":false},"author":28,"featured_media":32129,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rank_math_focus_keyword":"ha long bay","rank_math_title":"An 8 inch pale green sponge wedged in a limestone tunnel in Vietnam's Ha Long Bay matched specimens sitting mislabeled in Hawaii, revealing one sea sponge that changes color enough to fool experts for years","rank_math_description":"Divers discovered a new sea sponge species inside a limestone tunnel in Ha Long Bay, and museums in Hawaii and Thailand had already held specimens for yea","footnotes":""},"categories":[83],"tags":[],"class_list":["post-32111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth"],"_links":{"self":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/32111","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/users\/28"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/comments?post=32111"}],"version-history":[{"count":0,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/posts\/32111\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media\/32129"}],"wp:attachment":[{"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/media?parent=32111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/categories?post=32111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecoportal.net\/en\/wp-json\/wp\/v2\/tags?post=32111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}The tunnel where the living one turned up<\/h2>\n
Why a sponge is so easy to misfile<\/h2>\n
What the DNA finally settled<\/h2>\n
The hidden inventory of the sea<\/h2>\n