387:
132:
119:
401:
740:
359:
is the shape, thickness, and angle of the tooth whorl. Its teeth protrude outwards not like a tightly coiled saw, but instead a curved arrangement of cutting blades indicating it relied less on crushing slow-moving invertebrates and catching cephalopods, or other small mollusk prey, but inflicting
330:
is based on a poorly preserved material, so its size estimates along with those of some other large eugeneodonts are highly subjective due to their fragmentary fossil remains that cannot provide an empirical basis. While
Karpinsky separated the type species from the genus
360:
traumatic damage against more durable, faster prey. Their teeth grew at a much slower pace than those of other whorl-tooth sharks, resulting in a depreciated spiral, growing only half of the teeth a
375:
is thought to have been a nektonic carnivore that probably preyed upon a variety of different species, using its blade-like teeth to cut at exposed flesh like a hatchet or wedge.
784:
686:
808:
848:
828:
673:
843:
777:
425:
Merino-Rodo, Dagmar; et al. (1986). "Chondrichthyan and actinopterygian remains from theLower
Permian Copacabana Formation of Bolivia".
813:
770:
131:
818:
600:
Brad Matsen and Ray Troll (October 25, 2012). "Planet Ocean: A Story of Life, the Sea, and
Dancing to the Fossil Record".
838:
364:
would grow in its lifetime. The tooth spiral also was able to indicate the age of the eugeneodontidans in question.
853:
823:
803:
833:
610:
626:
314:
546:
Naugolnykh, S.V. (2018). "Artinskian (Early
Permian) Sea Basin and Its Biota (Krasnoufimsk, Cis-Urals)".
712:
664:
555:
473:
461:
434:
392:
571:
497:
323:, a related holocephalid that shares similar traits to it, including the helical whorl of teeth.
126:
717:
699:
691:
489:
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704:
563:
481:
442:
209:
559:
477:
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Maisey, John G.; Bronson, Allison W.; Williams, Robert R.; McKinzie, Mark (2017-05-04).
438:
306:
295:
196:
173:
118:
588:
446:
797:
575:
501:
69:
30:
337:, it has been recently suggested that this genus does represent a junior synonym of
750:
235:
485:
317:, Bolivia. The genus name, from "nearly coiled saw" in Greek, directly refers to
747:
658:
406:
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44:
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http://dinonews.net/forum/paleoactus.php?msg=168926
529:Zapiski Ural'skogo Obshchestva Estestvoispytatelei
778:
8:
420:
418:
351:One of the primary qualities that separate
16:Extinct genus of giant cartilaginous fishes
785:
771:
621:
117:
20:
462:"A Pennsylvanian 'supershark' from Texas"
548:Stratigraphy and Geological Correlation
414:
809:Prehistoric cartilaginous fish genera
7:
849:Prehistoric cartilaginous fish stubs
736:
734:
591:Parahelicoprion and Agassizodontidea
757:. You can help Knowledge (XXG) by
466:Journal of Vertebrate Paleontology
14:
829:Prehistoric fish of South America
738:
399:
385:
130:
272:Merino-Rodo & Janvier, 1986
611:"Fossilworks: Parahelicoprion"
1:
844:Fossil taxa described in 1916
486:10.1080/02724634.2017.1325369
447:10.1016/S0016-6995(86)80005-5
870:
814:Permian cartilaginous fish
733:
568:10.1134/S0869593818070080
515:Karpinsky, A.P. (1924). "
257:
252:
241:
234:
127:Scientific classification
125:
116:
23:
746:This article about a
713:Paleobiology Database
819:Permian fish of Asia
315:Copacabana Formation
560:2018SGC....26..734N
478:2017JVPal..37E5369M
439:1986Geobi..19..479M
393:Paleontology portal
839:Fossils of Bolivia
243:Helicoprion clerci
854:Holocephali stubs
824:Fossils of Russia
766:
765:
728:
727:
700:Open Tree of Life
627:Taxon identifiers
279:
278:
273:
265:
264:(Karpinsky, 1916)
230:
861:
804:Agassizodontidae
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326:The holotype of
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29:Temporal range:
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834:Permian Bolivia
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731:
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665:Parahelicoprion
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635:Parahelicoprion
629:
619:
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521:Parahelicoprion
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472:(3): e1325369.
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373:Parahelicoprion
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353:Parahelicoprion
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328:Parahelicoprion
283:Parahelicoprion
269:P. mariosuarezi
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247:Karpinsky, 1916
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229:Karpinsky, 1924
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224:Parahelicoprion
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210:Helicoprionidae
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37:298.9β295
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25:Parahelicoprion
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554:(7): 734β754.
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433:(4): 479β493.
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307:Ural Mountains
286:is an extinct
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759:expanding it
751:holocephalan
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236:Type species
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748:prehistoric
659:Wikispecies
517:Helicoprion
407:Fish portal
362:Helicoprion
357:Helicoprion
347:Description
340:Helicoprion
334:Helicoprion
320:Helicoprion
184:Holocephali
798:Categories
379:References
180:Subclass:
576:135304766
502:134127771
494:0272-4634
301:from the
261:P. clerci
150:Kingdom:
144:Eukaryota
650:Q7134758
644:Wikidata
253:Species
203:Family:
164:Chordata
160:Phylum:
154:Animalia
140:Domain:
705:4140105
692:1019852
679:4825208
556:Bibcode
535:: 1β10.
474:Bibcode
435:Bibcode
427:Geobios
305:of the
303:Permian
294:-like
216:Genus:
190:Order:
170:Class:
106:↓
574:
525:clerci
523:n.g.)
500:
492:
313:) and
311:Russia
753:is a
718:34463
687:IRMNG
572:S2CID
498:S2CID
355:from
292:shark
288:genus
755:stub
674:GBIF
490:ISSN
45:Preκ
564:doi
527:".
482:doi
443:doi
290:of
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417:^
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95:Pg
39:Ma
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519:(
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309:(
220:β
207:β
194:β
100:N
90:K
85:J
80:T
75:P
70:C
65:D
60:S
55:O
50:κ
34:~
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