Author: Olga HartmanPublisher:
ISBN:
Category : Science
Languages : en
Pages : 80
Book Description
The Marine Annelids of Oregon
Author: Olga HartmanMethods for Collection and Analysis of Aquatic Biological and Microbiological Samples
Author: Phillip E. GreesonPublisher:
ISBN:
Category : Aquatic biology
Languages : en
Pages : 344
Book Description
Bulletin
Author: United States National MuseumPublisher:
ISBN:
Category : Science
Languages : en
Pages : 662
Book Description
Techniques of Water-resources Investigations of the United States Geological Survey
Author: Proceedings of The Academy of Natural Sciences (Vol. 132, 1980)
Author: Publisher: Academy of Natural Sciences
ISBN: 9781437955286
Category :
Languages : en
Pages : 316
Book Description
Marine Research
Author: Revision of Sternaspis Otto, 1821 (Polychaeta, Sternaspidae)
Author: Kelly SendallPublisher: PenSoft Publishers LTD
ISBN: 9546426792
Category : Science
Languages : en
Pages : 82
Book Description
The peanut-shaped sternaspid polychaetes have been known since 1760 when Plancus named them as Mentula cucurbitacea marina. Sternaspids are common and abundant in soft bottoms. Some authors suggested that only one species should be recognized, whereas others regard a few species very widely distributed and variable depths. Delineating species was problematic; the ventro-caudal shield was disregarded or barely used for identifying species. In this contribution the ventral shield is evaluated and its diagnostic potential is confirmed. The revision of Sternaspis is based upon type or topotype materials. Sternaspid body, introvert hooks and shield show three distinct patterns: two genera have 7 abdominal segments and tapered introvert hooks, and one genus has 8 abdominal segments and spatulate introvert hooks. The ventro-caudal shield has 3 different patterns: stiff with ribs, and sometimes concentric lines, stiff with feebly-defined ribs but no concentric lines, and soft with firmly adhered sediment particles. Sternaspis is restricted to include species with 7 abdominal segments, falcate introvert hooks, and stiff shields, often exhibiting radial ribs, concentric lines or both. Two new genera incorporate the remaining species: Caulleryaspis has falcate introvert hooks, 7 abdominal segments, and soft shields with sediment particles firmly adhered on them. Petersenaspis has spatulate introvert hooks, 8 abdominal segments, and stiff shields with poorly-defined ribs but no concentric line. The geographic range of most species is smaller than previously indicated. Keys to genera and to all species are also included.
FWS/OBS.
Author: Systematics and Diversity of Annelids
Author: Maria CapaPublisher: MDPI
ISBN: 3036513906
Category : Science
Languages : en
Pages : 520
Book Description
In this Special Issue, we address the state of the art of the systematics of the main annelid groups and the improvements in the diversity they hold, with special emphasis on the latest discoveries in well-studied areas, expeditions to unsurveyed areas or environments, or the use of novel techniques that allow for the improvement of biodiversity knowledge. We are hoping that this Special Issue will provide a platform facilitating a review of current knowledge on the subject, identifying current research problems, as well as indicating directions and research trends for the future.
Author: