Next Article in Journal
Knowing the Enemy: Inducible Defences in Freshwater Zooplankton
Previous Article in Journal
Assessing the Nature Reserve Management Effort Using an Expert-Based Threat Analysis Approach
Open AccessArticle

More Knot Worms: Four New Polygordius (Annelida) Species from the Pacific and Caribbean

1
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0202, USA
2
Department Molecular Biology and Genetics, Koç University, Rumelifeneri Yolu, Sarıyer, Istanbul 34450, Turkey
3
Department of Fisheries and Oceans, Bedford Institute of Oceanography, Dartmouth, NS B2Y 4A2, Canada
*
Authors to whom correspondence should be addressed.
http://zoobank.org/urn:lsid:zoobank.org:pub:23D8E38E-4496-41F2-A4BC-A09251DD0F98
Diversity 2020, 12(4), 146; https://doi.org/10.3390/d12040146
Received: 3 March 2020 / Revised: 26 March 2020 / Accepted: 27 March 2020 / Published: 7 April 2020
(This article belongs to the Section Marine Diversity)
Polygordius is a clade of marine annelids mainly seen in coarse-grained habitats. They are notable for their smooth bodies, lacking in chaetae or obvious segments, and they resemble Nematoda or Nemertea. Though Polygordius taxa are found in all oceans of the world, identifying species based only on morphological characters can be challenging due to their relatively uniform external appearances. Diversity within the clade has likely been markedly underestimated. Where morphological characters are inconspicuous or even unreliable, molecular methods can provide clarity in delimiting species. In this study, morphological methods (examination under light and scanning electron microscopy) were integrated with molecular analyses (sequencing of Cytochrome c oxidase subunit I, 16S rRNA and Histone H3 gene fragments) to establish the systematic placement of Polygordius specimens collected from Australia, Belize, French Polynesia, Indonesia, Japan, and the U.S. west coast. These analyses revealed three new species of Polygordius from the Pacific Ocean (P. erikae n. sp., P. kurthcarolae n. sp., and P. kurthsusanae n. sp.) as well as one new species from the Caribbean Sea (P. jenniferae n. sp.). These new species are formally described, and a previously known Japanese species, P. pacificus Uchida, 1936, is redescribed. This study establishes the first molecular data set for Polygordius species from the Pacific region, as well as the first formal description of a Caribbean species of Polygordius. Phylogenetic relationships within Polygordius are summarized and discussed. View Full-Text
Keywords: integrative taxonomy; meiofauna; interstitial; diversity; distribution; new records integrative taxonomy; meiofauna; interstitial; diversity; distribution; new records
Show Figures

Figure 1

MDPI and ACS Style

Tustison, C.A.; Ramey-Balci, P.A.; Rouse, G.W. More Knot Worms: Four New Polygordius (Annelida) Species from the Pacific and Caribbean. Diversity 2020, 12, 146.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop