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Your search keyword '"Palaeonemertea"' showing total 3 results
Start Over Descriptor "Palaeonemertea" Publisher pensoft publishers
3 results on '"Palaeonemertea"'

1. Ribbon worms (phylum Nemertea) from Bodega Bay, California: A largely undescribed diversity.

Author

Ellison, Christina I., Frey, Madeline R., Sanford, Eric, and Maslakova, Svetlana

Subjects
*TIDAL flats, *BEACHES, *NEMERTEA, *DNA sequencing, *CYTOCHROME oxidase, *BARNACLES, *WORMS
Abstract

The diversity of nemerteans along the Pacific coast of the United States is regarded as well characterized, but there remain many cryptic, undescribed, and "orphan" species (those known only in their larval form). Recent sampling of nemerteans in Oregon and Washington has begun to fill in these taxonomic gaps, but nemertean diversity in California has received relatively little attention over the past 60 years. During the summers of 2019 and 2020, nemertean specimens were collected from 20 locations in the Bodega Bay region of northern California, USA, including rocky intertidal shores, sandy beaches, mudflats, and other habitats. Based on morphological assessment and DNA sequence analysis (partial Cytochrome Oxidase I and 16S rRNA genes), our surveys identified 34 nemertean species. Only 13 of these (38%) can be confidently assigned to described species. Another 11 represent species that are new to science, including members of the genera Riserius, Nipponnemertes, Poseidonemertes, Zygonemertes, Nemertellina, Oerstedia, and three species of uncertain affiliation. The remaining ten species include undescribed or cryptic species of uncertain status that have been found previously along the Pacific Coast of North America. Our surveys also document extensions of known geographic ranges for multiple species, including the first records in California of Antarctonemertes phyllospadicola, Cephalothrix hermaphroditica, and Maculaura oregonensis. This is the first report of the genus Nemertellina in the northeast Pacific and Riserius in California. Overall, our findings highlight how much remains to be learned about the diversity and distribution of nemerteans in the northeast Pacific. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Caridina sinanensis, a new species of stygobiotic atyid shrimp (Decapoda, Caridea, Atyidae) from a karst cave in the Guizhou Province, southwestern China

Author

Zhao-Liang Guo, Da-Jian Xu, Deng-Xu Li, and Xiao-Zhuang Zheng

Subjects
0106 biological sciences, 0301 basic medicine, Not assigned, Conservation Biology, Palaeonemertea, southwestern China, 01 natural sciences, Eumalacostraca, taxonomy, Caridea, Genus, Crustacea, COI and 16S rRNA, Decapoda, lcsh:Zoology, Bilateria, freshwater biodiversity, lcsh:QL1-991, Malacostraca, Invertebrata, Ecology & Environmental sciences, biology, spelaeology, Rostrum, Cephalornis, Tubulanidae, Shrimp, Geography, Taxonomy (biology), Eucarida, Coelenterata, Research Article, Asia, karst landform, Arthropoda, Carinina sinensis, Nephrozoa, Protostomia, Zoology, Carinina, Circumscriptional names of the taxon under, 010603 evolutionary biology, Atyidae, 03 medical and health sciences, Polychelida, biology.animal, Biodiversity & Conservation, Animalia, Ecology, Evolution, Behavior and Systematics, biology.organism_classification, Caridina, Nemertea, 030104 developmental biology, Notchia, Ecdysozoa, Animal Science and Zoology
Abstract

From a biodiversity survey of a subterranean habitat near Sinan County, Guizhou Province, southwestern China, a new atyid shrimp of the genus Caridina H. Milne Edwards, 1837, C. sinanensissp. nov. was discovered. The new species can be separated from other congeners based on a combination of characters including depigmentation in body and reduction of eyes, small pigment spot at the centre of the cornea, the shape of rostrum and the endopod of the 1st male pleopod, and the relatively longer appendix interna on the appendix masculina of the 2nd pleopod. Mitochondrial COI and 16S rRNA gene sequences also support the establishment of the new species. Information on the habitat, and the levels of threat are discussed to guide the conservation of C. sinanensissp. nov.

Published
2020

3. A shore-based preliminary survey of marine ribbon worms (Nemertea) from the Caribbean coast of Colombia

Author

Sigmer Quiroga, Jon L. Norenburg, and Jaime Gonzalez-Cueto

Subjects
Hoplonemertea, Fauna, Monostilifera, Biodiversity, Palaeonemertea, Rhynchocoela, lcsh:Zoology, Littoral zone, Animalia, lcsh:QL1-991, Heteronemertea, Ecology, Evolution, Behavior and Systematics, Polystilifera, Nemertea, Shore, Lineidae, geography, geography.geographical_feature_category, biology, Ecology, benthic species, Nemertini, biology.organism_classification, Checklist, Tubulanidae, Caribbean biodiversity, Benthic zone, Animal Science and Zoology, Valenciniidae
Abstract

A checklist of benthic ribbon worm species from the Caribbean coast of Colombia is presented, including synonyms, distributions, a photographic record, and the main morphologic characters of each species for a rapid identification. This is the first research focused broadly on nemerteans in Colombia. 54 specimens of nemerteans were hand-collected from the rocky littoral of two different localities, and identified according to personal experience and specialist literature. 13 species were found; of which 11 represent new records for the country. These species belong to eight different traditionally used families: Tubulanidae, Valenciniidae, Lineidae, Amphiporidae, Cratenemertidae, Emplectonematidae, Drepanophoridae and Ototyphlonemertidae. The most common and abundant species was Dushia atra. The biodiversity of nemerteans in Colombia seems to overlap with the nemertean fauna from Florida and Brazil, explained by the convergence of the North Brazil Current, Guiana Current, Caribbean Currents and the Panama-Colombia Contracurrent in the sampled region. The results of this work suggest that the Caribbean coast of Colombia is a region with a high diversity of nemerteans, and provide important taxonomic data for environmental assessments and future biological research.

Published
2014

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