| 词条 | Macrogrammus |
| 释义 |
| name = Macrogrammus | status = fossil | fossil_range = Early Arenig[1] | regnum = Animalia | phylum = Arthropoda | classis = Trilobita | ordo = Phacopida | superfamilia = | familia = Pilekiidae | genus = Macrogrammus }} Macrogrammus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the early part of the Arenig stage of the Ordovician Period,[1] a faunal stage which lasted from approximately 478 to 471 million years ago. References1. ^1 {{cite journal |last=Sepkoski |first=Jack |authorlink= |coauthors= |title=A compendium of fossil marine animal genera (Trilobita entry) |journal=Bulletins of American Paleontology |volume=364 |issue= |page=560 |publisher= |location= |year=2002 |url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class |doi= |id= |accessdate=2008-01-12 |deadurl=yes |archiveurl=https://web.archive.org/web/20060905162524/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=307&rank=class |archivedate=2006-09-05 |df= }} {{Taxonbar|from=Q16962983}}{{Phacopida-stub}} 5 : Pilekiidae|Phacopida genera|Ordovician trilobites|Trilobites of South America|Trilobites of Europe |
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