| 词条 | Maretia |
| 释义 |
| image = Tiny maretia heart urchin (Maretia planulata).jpg | image_width = 240px | image_caption = Maretia planulata | fossil_range = {{fossil range|40.4|0|Eocene - Recent}} | regnum = Animalia | phylum = Echinodermata | classis = Echinoidea | superordo = Atelostomata | ordo = Spatangoida | familia = Spatangidae | genus = Maretia | genus_authority = Gray, 1855 }}Maretia is a genus of heart urchins belonging to the family Spatangidae.[1][2] Species
DescriptionThese sea urchins are irregular, as the mouth is located at the front of the underside of the animal, while the anus is located in rear end position. Fossil recordFossils of Maretia are found in marine strata from the Eocene until the Quaternary (age range: from 40.4 to 0.012 million years ago.). Fossils are known from some localities in United Kingdom, United States, Germany, Cuba, Indonesia, New Zealand and Eritrea.[4] References1. ^Catalogue of life 2. ^Ubio 3. ^WoRMS 4. ^Paleobiologhy Database
External links
2 : Spatangoida|Spatangidae |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。