David in Japan Posted November 5, 2021 Share Posted November 5, 2021 Hi TFF friends, it's been a while. I hope you're all fine. This week, I explored my favorite place in Kumamoto prefecture (trip report coming these week-end) and found the following fossil. First time I saw such fossil from this location. I have browsed the literature related to this location but I unfortunately didn't find any clues about what this fossil could be. I suspect this could be some kind of fish tooth. In the all the papers I read about this location, I found some mentions of fish material found there but no description or further information. I was wondering if this could be some kind of Pycnodont tooth, the general shape matches and we can see in cross section the kind of fold where the root is missing. However the regular grooves on the surface makes me doubt about my guess a little bit as I think that Pycnodont tooth are "smooth" . If any one has a guess about what it could be, do not hesitate to throw it in the comments. Any help is welcome. Size: 8mm by 3mm Himenoura Formation (lower) Late Cretaceous (Santonian) Kumamoto prefecture, Japan ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 5, 2021 Share Posted November 5, 2021 Hi, David. My first thought is praying mantis egg case. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Rockwood Posted November 5, 2021 Share Posted November 5, 2021 The texture looks like. . . @Carl Maybe it's a coprolite ? 1 Link to comment Share on other sites More sharing options...
David in Japan Posted November 5, 2021 Author Share Posted November 5, 2021 2 hours ago, Tidgy's Dad said: Hi, David. My first thought is praying mantis egg case. Ootheca? Your right it looks a little bit alike. When i fist found it i thought it was a satsuma cockroach before realising it was a fossil. 1 ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
David in Japan Posted November 5, 2021 Author Share Posted November 5, 2021 2 hours ago, Rockwood said: The texture looks like. . . @Carl Maybe it's a coprolite ? It is really smooth except the fact it has those grooves. The grooves are spaced very regularly. It does not look like a bivalve. I put in red the cross section. I found in the past coprolites from this very location, they are usually phosphatised and jet-black. ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
caterpillar Posted November 5, 2021 Share Posted November 5, 2021 Maybe ostracod 1 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Rockwood Posted November 5, 2021 Share Posted November 5, 2021 13 minutes ago, David in Japan said: found in the past coprolites from It brings to my mind coprolites that I collected at Blue Beach in Nova Scotia Canada. The surface of them is smooth, the texture is too though. Those are almost the texture of modern excrement. Maybe Carl is back to his break routine at the museum. He may be along soon. 1 1 Link to comment Share on other sites More sharing options...
Carl Posted November 5, 2021 Share Posted November 5, 2021 4 hours ago, Rockwood said: The texture looks like. . . @Carl Maybe it's a coprolite ? I'm thinking not: the lines are a bit too regular here. 1 1 1 Link to comment Share on other sites More sharing options...
Rockwood Posted November 5, 2021 Share Posted November 5, 2021 There you have it, straight from. Well we won't go there. Carl's a good. 1 1 Link to comment Share on other sites More sharing options...
David in Japan Posted November 5, 2021 Author Share Posted November 5, 2021 2 hours ago, Rockwood said: There you have it, straight from. Well we won't go there. Carl's a good. 2 hours ago, Carl said: I'm thinking not: the lines are a bit too regular here. 4 hours ago, caterpillar said: Maybe ostracod Yes, the pattern is too regular for something going straight out of an ... Thank you. Reducing the possibilities is also a good thing. Ostracod could be a good push. Would match the marine environment, a saw they can grow up to 5 cm so the size is in the good bracket. Still the pattern of the grooves is intriguing. I have never seen an ostracod fossil and i do not know anything about their ontogeny but shouldn t we see growth ring of some sort on the outside of the shell, a little bit like in bivalves? Sorry, it is a stupid question but i do not know ostracod dev stages. ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 5, 2021 Share Posted November 5, 2021 Newbie - Member Introductions - The Fossil Forum Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
David in Japan Posted November 6, 2021 Author Share Posted November 6, 2021 5 hours ago, Tidgy's Dad said: Newbie - Member Introductions - The Fossil Forum Praying mantis ootheca ard really weird isn t it? Have a lot in my garden, the cool thing is that it start like a foam and then harden. 1 ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
caterpillar Posted November 7, 2021 Share Posted November 7, 2021 On 11/5/2021 at 4:11 PM, David in Japan said: Sorry, it is a stupid question but i do not know ostracod dev stages. Ostracods exist from ordovician (maybe cambrian) to recent http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
David in Japan Posted November 9, 2021 Author Share Posted November 9, 2021 On 11/5/2021 at 7:53 PM, caterpillar said: Maybe ostracod Thank you for the push. I contacted a friend working at Ehime University and he agreed this might be an ostracod. Thank you all. ~~~~~~~~~~~~〇~~~~~~~~~~~~~ Warmest greetings from Kumamoto、 Japan Link to comment Share on other sites More sharing options...
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