Helicoprion

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Helicoprion

a genus of fossil animals belonging to the shark family, described by the Russian scientist A. P. Karpinskii. Helicoprion was distributed in the early Permian period in the seas that covered the territories of the Urals, Japan, Australia, Spitsbergen, and the United States. The middle (symphyseal) row of teeth in the lower jaw merged into a spiral of two or three turns (hence the name) that protruded from the mouth and was bent on the outside into a cartilaginous cavity. Small crushing teeth in the upper jaw opposed the spiral organ.

REFERENCE

Obruchev, D. V. “Izuchenie edestid i raboty A. P. Karpinskogo.” Tr. Paleontologicheskogo in-ta, 1953, vol. 45.

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No references found			Timothy Bradley offers tidbits of information about the earliest species from the Paleozoic era, with the angel-shaped Doliodus and the Helicoprion with the buzzsaw jaw leading the aquatic parade. Animal tales a natural draw for children by Telegram & Gazette (Worcester, MA)			helical scanning helical spring helical stair helical steel support helical traveling-wave tube helical-fin section helical-flow turbine helical-spline broach helicase helicate Helice Helichrysum helicin Helicinidae Helicity helicline Helicobacter helicoid helicoid cyme Helicon Helicon Home Colony Helicon, Mount Heliconiaceae Heliconidae Helicoplacoidea Helicoprion Helicopter Helicopter Carrier Helicopter Engine Helicopter Landign Pad Helicopter Sports helicopter yarding Helicosporae helicospore Helicosporida helicotrema helictite Helictotrichon Heligmosomidae Heligoland Helike helimagnet helimagnetism Heliobiology heliocentric heliocentric coordinates heliocentric Julian date heliocentric latitude heliocentric longitude heliocentric orbit Heliocentric Parallax			Helicoidal Helicoidal Bianisotropic Media helicoids helicoids helicoids helicoids helicon helicon Helicon (disambiguation) Helicon (disambiguation) Helicon Double Layer Thruster Helicon Home Colony Helicon, Mount Heliconia Heliconiaceae Heliconian heliconias Heliconidae Heliconiinae Heliconius charithonia helicons helicons Helicoplacoidea Helicoplacus helicopod helicopod gait helicopod gait helicopod gait helicopod gait helicopodia Helicoprion helicopter helicopter helicopter Helicopter Acoustic Receiver System Helicopter Action Group Helicopter Action Group Commander Helicopter Active Control Rotor Helicopter Active Control Technology Helicopter Advance Readiness Program Helicopter Advanced Health and Usage Monitoring System Helicopter Adverse Weather Fire Control Radar Helicopter Adverse Weather Fire Control/Acquisition Radar System Helicopter Adverse Weather Target Acquisition and Destruction System Helicopter Adverse Weather Target Servicing System Helicopter Aerial Refueling Helicopter Air Data System Helicopter Air to Air Combat Helicopter Air-To-Air Combat Simulation Helicopter Aircraft Commander Helicopter Aircrew Breathing Device Helicopter Aircrew Integrated Life Support System Helicopter Aircrew Survivability Program Helicopter Ambulance Medical Detachment Helicopter and Aircraft Detection Training System Helicopter Anti-Submarine Squadron Helicopter Anti-Submarine Warfare Squadron Light

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