Prostoma graecense
{{Short description|Species of Nemertea}}
{{Speciesbox
| image = Prostoma graecense (YPM IZ 088793) 001.jpeg
| genus = Prostoma
| species = graecense
| authority = (Böhmig, 1892)
| synonyms =
{{species list
| Monopora lacustris | (du Plessis, 1892)
| Prostoma jenningsi | Gibson & Young, 1971
| Prostoma rubrum | (Leidy)
| Stichostemma graecense | (Böhmig, 1892)
| Tetrastemma graecense | Böhmig, 1893
| Tetrastemma graecensis | Böhmig, 1892
| Tetrastemma lacustre | du Plessis, 1892
}}
| synonyms_ref = {{GBIF |id=4288870 |taxon=Prostoma graecense |accessdate=17 September 2021}}
}}
Prostoma graecense is a species of Nemertea in the family Prostomatidae.{{Cite web|title=Prostoma graecense (Böhmig 1892) - Encyclopedia of Life|url=https://eol.org/pages/46586703|access-date=2021-09-17|website=eol.org|language=en}} It was once called Emea rubrum.{{Cite book|last=Smith|first=Douglas Grant|url=https://books.google.com/books?id=GqIctb8IqPoC&q=Prostoma+graecense&pg=PA109|title=Pennak's Freshwater Invertebrates of the United States: Porifera to Crustacea|date=2001-08-07|publisher=John Wiley & Sons|isbn=978-0-471-35837-4|pages=109|language=en}} It is closely related to Prostoma eilhardi. The species is distributed all across the world.
Characteristics
Individuals in this species can reach up to a length of 5 cm. It is hermaphroditic and has 2 or 3 pairs of eyes.{{Cite book|last=Hammerson|first=Geoffrey A.|url=https://books.google.com/books?id=FWc3zDq9P10C&q=Prostoma+graecense&pg=PA191|title=Connecticut Wildlife: Biodiversity, Natural History, and Conservation|date=2004|publisher=UPNE|isbn=978-1-58465-369-1|pages=191|language=en}}
Occurrence
It is distributed all across the world. However the authenticity of this is hard to tell. It has been reported in the continents of Europe, Africa, Asia, South America, Australia, and North America.{{Cite book|last=Clifford|first=Hugh F.|url=https://books.google.com/books?id=8UQ4jHev6voC&q=Prostoma+graecense&pg=RA1-PA535|title=Aquatic Invertebrates of Alberta|date=1991|publisher=University of Alberta|isbn=978-0-88864-234-9|pages=40|language=en}}
It has been reported in Japan, Russia, New Zealand, Kenya,{{Cite book|last1=Balian|first1=E. V.|url=https://books.google.com/books?id=Dw4H6DBHnAgC&q=Prostoma+graecense&pg=PA65|title=Freshwater Animal Diversity Assessment|last2=Lévêque|first2=C.|last3=Segers|first3=H.|last4=Martens|first4=K.|date=2008-04-27|publisher=Springer Science & Business Media|isbn=978-1-4020-8259-7|pages=64|language=en}} Venezuela, Argentina, and Mexico.{{Cite book|last1=Damborenea|first1=Cristina|url=https://books.google.com/books?id=PgFQCwAAQBAJ&q=Prostoma+graecense&pg=PA123|title=Thorp and Covich's Freshwater Invertebrates: Volume 5: Keys to Neotropical and Antarctic Fauna|last2=Rogers|first2=D. Christopher|last3=Thorp|first3=James H.|date=2020-06-26|publisher=Academic Press|isbn=978-0-12-804266-3|pages=121|language=en}} Genetic evidence indicates this species was introduced by humans.{{Cite book|last1=Thorp|first1=James H.|url=https://books.google.com/books?id=LB-OAwAAQBAJ&q=Prostoma+graecense&pg=PA207|title=Thorp and Covich's Freshwater Invertebrates: Ecology and General Biology|last2=Rogers|first2=D. Christopher|date=2014-09-06|publisher=Elsevier|isbn=978-0-12-385027-0|pages=206|language=en}}{{Clarify|date=October 2021}}
It is the only known species of fresh water Nemertea in Australia.{{Cite book|last=Williams|first=William David|url=https://books.google.com/books?id=2qqrV5WaJ4sC&q=Prostoma+graecense&pg=PA55|title=Australian Freshwater Life: The Invertebrates of Australian Inland Waters|date=1980|publisher=Macmillan Education AU|isbn=978-0-333-29894-7|pages=55|language=en}}
It is rarely found in the United States. But in the state of Connecticut it lives in freshwater habitats. Here it usually lives among algae, plants, or detritus. It is more numerous during the Fall season.