New Shrinking Worm Discovered Off Spain’s Coast
Recently, researchers have made an exciting discovery in the world of invertebrates with the identification of a new genus and species of ribbon worm named Pararosa vigarae. This remarkable accordion worm, found in the Ría de Arosa on Spain’s northwest coast, has the extraordinary ability to compress its body to just one-fifth of its normal length. The worm was located under rocks at a depth of 30 meters (98 feet), and its identification was made possible through a combination of morphological data and advanced DNA analysis techniques.
Classification Challenges
The classification of the accordion worm presents significant challenges for scientists. According to a study published in the Royal Society Open Science, these worms belong to the phylum Nemertea, which consists of predatory species that utilize venom to subdue their prey. Taxonomical studies of Nemerteans are particularly difficult due to their lack of distinctive external morphological features. Traditionally, taxonomy relies on visible characteristics for classification, but the limited external traits of Nemerteans have hindered their study.
To address this issue, researchers attempted to use internal anatomical features as classification markers. However, this approach proved to be complex and impractical, leading to a stagnation in the understanding of this phylum. Currently, there are about 1,350 described species within Nemertea, but many remain poorly understood due to these classification challenges.
Genetic Analysis
The study conducted on Pararosa vigarae involved extensive molecular phylogenetic analyses. Researchers examined partial sequences of several gene markers, including 16S rRNA, 18S rRNA, 28S rRNA, cytochrome c oxidase subunit I (COI), and histone H3. These analyses confirmed that the newly identified specimens belong to a new genus and species within the family Lineidae, a subgroup of heteronemerteans.
Imaging experiments further revealed the unique physical characteristics of the accordion worm. When contracted, the worm forms distinct rings due to annular epidermal constrictions, which remain visible even when the worm is fully extended. The number of these rings varies with the size of the specimen; for instance, the largest specimen collected displayed 60 rings when fully stretched. This fascinating ability not only highlights the worm’s adaptability but also adds to the intrigue surrounding this newly discovered species.
Observer Voice is the one stop site for National, International news, Sports, Editor’s Choice, Art/culture contents, Quotes and much more. We also cover historical contents. Historical contents includes World History, Indian History, and what happened today. The website also covers Entertainment across the India and World.
Follow Us on Twitter, Instagram, Facebook, & LinkedIn
