{"product_id":"2-75-diplomystus-dentatus-and-2-5-knightia-eocaena-100-natural-green-river-formation-wyoming","title":"2.75\" Diplomystus dentatus and 2.5\" Knightia eocaena | 100% Natural | Green River Formation | Wyoming","description":"\u003cp style=\"text-align: center;\"\u003eDiplomystus dentatus and Knightia eocaena\u003cbr\u003eEocene (51.98 Million Years Ago) \u003cbr\u003eGreen River Formation, Wyoming, USA \u003cbr\u003eIn Stone Fossils Private Quarry\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003ePlate approx. size: 9.5\" x 5.25\"\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eDiplomystus approx. size: 2.75\"\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eKnightia approx. size: 2.5\"\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e \u003c\/p\u003e\n\u003cdiv class=\"Polaris-Popover__ContentContainer\"\u003e\n\u003cdiv class=\"Polaris-Popover__Content Polaris-Popover__Content--fluidContent\" id=\":r6rv:\"\u003e\n\u003cdiv data-polaris-scrollable=\"true\" class=\"Polaris-Popover__Pane Polaris-Scrollable Polaris-Scrollable--vertical Polaris-Scrollable--horizontal Polaris-Scrollable--scrollbarWidthThin\"\u003e\n\u003cdiv class=\"_PopoverContainer_1o103_1\"\u003e\n\u003cdiv data-polaris-scrollable=\"true\" class=\"Polaris-Popover__Pane Polaris-Scrollable Polaris-Scrollable--vertical Polaris-Scrollable--horizontal Polaris-Scrollable--scrollbarWidthThin\"\u003e\n\u003cdiv class=\"_Container_1kcqz_1\"\u003e\n\u003cdiv class=\"_Vertical_1kcqz_9\"\u003e\n\u003cdiv class=\"_VerticalLayout_tmqkl_40\"\u003e\n\u003cdiv class=\"_OutputSection_tmqkl_1\"\u003e\n\u003cdiv class=\"_ContentWrapper_tmqkl_19\"\u003e\n\u003cdiv data-polaris-scrollable=\"true\" class=\"_Content_tmqkl_19 _VerticalContent_tmqkl_45 Polaris-Scrollable Polaris-Scrollable--vertical Polaris-Scrollable--horizontal Polaris-Scrollable--scrollbarWidthThin\"\u003e\n\u003cdiv class=\"Polaris-Box\"\u003e\n\u003cdiv class=\"Polaris-InlineStack\"\u003e\n\u003cp class=\"_TextOutput_nect0_1\"\u003eThis is a completely natural, unrestored fossil specimen featuring both fish positioned dorsally correct as originally preserved.\u003c\/p\u003e\n\u003cp class=\"_TextOutput_nect0_1\"\u003e \u003c\/p\u003e\n\u003cp class=\"_TextOutput_nect0_1\"\u003e\u003cstrong\u003e\u003c\/strong\u003eDiplomystus is an extinct genus of freshwater clupeomorph fish distantly related to modern-day extant herrings, alewives, and sardines. The genus was first named and described by Edward Drinker Cope in 1877.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eRay-finned Fish - Diplomystus dentatus\u003c\/p\u003e\n\u003cp\u003eOrder Ellimmichthyiformes, Family Paraclupeidae\u003c\/p\u003e\n\u003cp\u003eThe last known species of the Ellimmichthyiformes order went extinct sometime in the middle Eocene. D. dentatus is a primitive relative of the modern day herring. The genus Diplomystus is also known from fossil deposits in China.\u003c\/p\u003e\n\u003cp\u003eD. dentatus is the 2nd most common fossil fish found from Fossil Lake. Specimens ranging from embryonic size (about 0.7 inches) to full-grown adults (about 26 inches) are common. Smaller-sized specimens are more commonly found in mid-lake than near-shore deposits. This suggests that D. dentatus spawned in open water.\u003c\/p\u003e\n\u003cp\u003eThis species' upturned mouth indicates it fed at the surface of Fossil Lake. D. dentatus specimens are commonly found with other fish stuck in their mouths, including other D. dentatus specimens.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eKnightia is an extinct genus of clupeid bony fish that lived in the freshwater lakes and rivers of North America and Asia during the Eocene epoch. The genus was erected by David Starr Jordan in 1907, in honor of the late University of Wyoming professor Wilbur Clinton Knight, \"an indefatigable student of the paleontology of the Rocky Mountains.\" It is the official state fossil of Wyoming, and the most commonly excavated fossil fish in the world.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eKnightia belongs to the same taxonomic family as herring and sardines, and resembled the former closely enough that both Knightia alta and Knightia eocaena were originally described as species of true herring in the genus Clupea.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAs with modern-day clupeids, Knightia sp. likely fed on algae and diatoms, as well as insects and occasionally smaller fish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAnatomy\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn Knightia fish, rows of dorsal and ventral scutes run from the back of the head to the medial fins. They had heavy scales and small conical teeth. Their size varied by species: Knightia eocaena was the longest, growing up to 25 cm (10 in), though most specimens are no larger than 15 cm. K. alta was shorter and relatively wider, with specimens averaging between 6 and 10 cm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePredators\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA small schooling fish, Knightia made an abundant food source for larger Eocene predators. The Green River Formation has yielded many fossils of larger fish species preying on Knightia; specimens of Diplomystus, Lepisosteus, Amphiplaga, Mioplosus, Phareodus, Amia, and Astephus have all been found with Knightia in either their jaws or stomachs.\u003c\/span\u003e\u003c\/p\u003e","brand":"In Stone Fossils","offers":[{"title":"Default Title","offer_id":49174280306910,"sku":"DIPKN-07","price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0466\/5117\/9163\/files\/20261008-175725_81333f0f-493b-4049-865b-5e8348919159.jpg?v=1791504368","url":"https:\/\/instonefossils.com\/products\/2-75-diplomystus-dentatus-and-2-5-knightia-eocaena-100-natural-green-river-formation-wyoming","provider":"In Stone Fossils ","version":"1.0","type":"link"}