Spio seticornis
| Spio seticornis | ||||||||||||
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Spio seticornis (Figures 1-7) and Spio filicornis (Figures 8-12). Otto Fabricius (1785): From the Spio sex, a new worm sex . |
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| Scientific name | ||||||||||||
| Spio seticornis | ||||||||||||
| ( Linnaeus , 1767) |
Spio seticornis (in Otto Fabricius "the bristle-horned Spio") is amarine annelid describedby Linnaeus from the family of Spionidae within the class of polychaetes . It was foundin the Arctic Sea near Greenland , but has beenaroundsince the 20th century. There are no more scientific papers in the 19th century.
features
Spio seticornis has an approximately 7.5 cm long, thread-like body, flat on top and furrowed and convex below, which in adult animals has about 70 segments with parapodia . The head is broad behind, but tapers towards the front in a rounded snout. On the sides of it are two elongated black eyes that are closer to each other. The pharynx cannot be protruded from the mouth. A pair of very mobile, curled, white, delicate, long and thin antennae, which are about as long as the body, sit just in front of the eyes. The body is widest in the middle and tapers towards the head, but even stronger towards the tail, so that the rearmost segments are the smallest. There are two short, egg-shaped warts on the pygidium. The head is pale, the segments on both sides black-gray with white horizontal stripes, the middle segments whitish green with red vertical stripes on the back and the rear segments sea-green with light green edges and cross lines. The threads on the back have red stripes.
The cylindrical, evenly thick living tube of Spio seticornis is about three times as long as the body.
Publication history
Linnaeus described Nereis seticornis from the Greenland Sea in the 12th edition of the Systema naturae 1767 as a Nereis with two tentacles on the head that are about as long as the body. The Danish clergyman Otto Fabricius , author of the Fauna Groenlandica , described the genus Spio in 1785 , in which he placed Spio seticornis and the species Spio filicornis described by Otto Friedrich Müller in 1776 under the name Nereis filicornis . In the 13th edition of the Systema naturae published by Johann Friedrich Gmelin in 1788, the species already appears as Spio seticornis and is contrasted with the species Spio filicornis .
In the 19th century the species was referred to repeatedly, for example by Anders Sandöe Örsted in 1844 . Wilhelm Michaelsen mentions occurrences of the species in the eastern Baltic Sea in 1897 , but in the same year Félix Mesnil recognized alleged specimens of Spio seticornis sent to him as identical to Pygospio elegans .
Spio seticornis is the first described species, which is now part of the Spionidae family , but Spio filicornis was assigned the status of a type species. In contrast to Spio filicornis , there have been no more works on Spio seticornis since the 20th century . The World Register of Marine Species (WoRMS) lists Spio seticornis as a valid species name.
literature
- Caroli a Linné , Systema naturae , per regna tria naturae, secundum classes, ordines, genera, species cum characteribus, differentiis, synonymis, locis. Tom. I. Pars II. Trattner, 1767. p. 1085. 286. Nereis, seticornis. 4th
- Otto Friedrich Müller : Zoologiae Danicae prodromus: seu Animalium Daniae et Norvegiae indigenarum characteres, nomina, et synonyma imprimis popularium. Hafniae, Typiis Hallageriis, 1776. Nereis , 2639. N. seticornis , p. 218.
- Otto Fabricius (1785): From the Spio family, a new worm family Nereis seticornis and Nereis filicornis, with illustrations. Writings of the Berlin Society of Friends of Nature Research 6, pp. 256–270.
- Johann Friedrich Gmelin (Ed.): Caroli a Linné, Systema naturae. Tom. I. Pars VI. Vermes Mollusca. Impensis Georg Emanuel Beer, 1788. p. 3109. Spio, seticornis. 1.
- Anders Sandöe Örsted (1844): On the classification of annulates with a description of some new or insufficiently known genera and species. Archive for Natural History, Berlin, 10 (1), pp. 99–112, here p. 106f.
- Wilhelm Michaelsen (1897): The polychaete fauna of the German seas including the neighboring and connecting areas. Scientific marine studies published by the Commission for the Scientific Investigation of the German Seas in Kiel and the Biological Institute on Heligoland. New episode, 2 (1-1), p. 152.
- Félix Mesnil (1897): Études de morphologie external chez les annélides. Bulletin scientifique de la France et de la Belgique 30, pp. 83-100.
Individual evidence
- ^ Spio seticornis (Linnaeus, 1767). G. Read, K. Fauchald (Eds.): World Polychaeta database. WoRMS , 2018. Retrieved November 13, 2018.