Horn sharks, Heterodontus francisci, are unique among sharks for their ability to rest motionless for extended periods without constantly swimming to breathe.
Photo: CC BY-SA 2.5
Photo: CC BY-SA 2.5
October 3, 2026 at 10:23 PM
Horn sharks, Heterodontus francisci, are unique among sharks for their ability to rest motionless for extended periods without constantly swimming to breathe.
Photo: CC BY-SA 2.5
Photo: CC BY-SA 2.5
29/ Horn sharks (Heterodontus francisci) are other candidates - and they live south of the SF bay area, with a similar diet to the wolf eel. These tubby little sharks have a fossil record going back to the Cretaceous. I photographed this one while snorkeling last June.
September 22, 2026 at 5:21 PM
29/ Horn sharks (Heterodontus francisci) are other candidates - and they live south of the SF bay area, with a similar diet to the wolf eel. These tubby little sharks have a fossil record going back to the Cretaceous. I photographed this one while snorkeling last June.
@gubigu.eurosky.social Heterodontus portusjacksoni
September 15, 2026 at 3:39 PM
@gubigu.eurosky.social Heterodontus portusjacksoni
🦈 The California horn shark (Heterodontus francisci) shows notable population structure influenced by deep-water channels and geographic distance. Photo by Cymothoa exigua
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September 7, 2026 at 9:11 PM
🦈 The California horn shark (Heterodontus francisci) shows notable population structure influenced by deep-water channels and geographic distance. Photo by Cymothoa exigua
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Little sharks in a genomic world: A high-resolution view of population structure in the California horn shark (Heterodontus francisci) doi.org/10.1093/jher...
Little sharks in a genomic world: A high-resolution view of population structure in the California horn shark (Heterodontus francisci)
Abstract. The California horn shark (Heterodontus francisci) is a small demersal elasmobranch distributed along Pacific coastlines from California to Mexic
doi.org
September 2, 2026 at 4:57 PM
Little sharks in a genomic world: A high-resolution view of population structure in the California horn shark (Heterodontus francisci) doi.org/10.1093/jher...
Paleo Fact!
Eremiasaurus (Desert Lizard) is a mosasaurid from Late Cretaceous Africa! Its name refers to the arid climate of modern Morocco, where it was found! The name of its only currently known species, E. heterodontus, means "different teeth," which refers to how- (1/2)
Art by Joschua Knüppe!
Eremiasaurus (Desert Lizard) is a mosasaurid from Late Cretaceous Africa! Its name refers to the arid climate of modern Morocco, where it was found! The name of its only currently known species, E. heterodontus, means "different teeth," which refers to how- (1/2)
Art by Joschua Knüppe!
June 21, 2024 at 7:40 PM
Paleo Fact!
Eremiasaurus (Desert Lizard) is a mosasaurid from Late Cretaceous Africa! Its name refers to the arid climate of modern Morocco, where it was found! The name of its only currently known species, E. heterodontus, means "different teeth," which refers to how- (1/2)
Art by Joschua Knüppe!
Eremiasaurus (Desert Lizard) is a mosasaurid from Late Cretaceous Africa! Its name refers to the arid climate of modern Morocco, where it was found! The name of its only currently known species, E. heterodontus, means "different teeth," which refers to how- (1/2)
Art by Joschua Knüppe!
Our #FishOfTheWeek this week is… the Port Jackson Shark (Heterodontus portusjacksoni) 🐟
👇More #fishfacts and the latest #research featuring ASFB members:
doi.org/10.1016/j.ma...
🌐 Info via Fishes of Australia: fishesofaustralia.net.au
#Australia #fish #biology
👇More #fishfacts and the latest #research featuring ASFB members:
doi.org/10.1016/j.ma...
🌐 Info via Fishes of Australia: fishesofaustralia.net.au
#Australia #fish #biology
August 26, 2025 at 8:30 PM
Our #FishOfTheWeek this week is… the Port Jackson Shark (Heterodontus portusjacksoni) 🐟
👇More #fishfacts and the latest #research featuring ASFB members:
doi.org/10.1016/j.ma...
🌐 Info via Fishes of Australia: fishesofaustralia.net.au
#Australia #fish #biology
👇More #fishfacts and the latest #research featuring ASFB members:
doi.org/10.1016/j.ma...
🌐 Info via Fishes of Australia: fishesofaustralia.net.au
#Australia #fish #biology
マクセルアクアパーク品川のサメ水槽にいるとされていたが観たことなかったネコザメ（Heterodontus japonicus）、先日ついに確認。
#ネコザメ #サメ #shark #水族館 #bullheadshark #Japanesebullheadshark
#ネコザメ #サメ #shark #水族館 #bullheadshark #Japanesebullheadshark
August 5, 2025 at 3:23 AM
マクセルアクアパーク品川のサメ水槽にいるとされていたが観たことなかったネコザメ（Heterodontus japonicus）、先日ついに確認。
#ネコザメ #サメ #shark #水族館 #bullheadshark #Japanesebullheadshark
#ネコザメ #サメ #shark #水族館 #bullheadshark #Japanesebullheadshark
This shy creature, posing for our May Photo of the Month, is a horn shark (Heterodontus francisci), spotted near Catalina Island.
📷 Photo: Allie Smith, San Diego
Submit YOUR CA coast and ocean photo:
opc.ca.gov/2024/08/submit-photo
Read the May newsletter and subscribe: bit.ly/OPC-MAY-2025
📷 Photo: Allie Smith, San Diego
Submit YOUR CA coast and ocean photo:
opc.ca.gov/2024/08/submit-photo
Read the May newsletter and subscribe: bit.ly/OPC-MAY-2025
May 28, 2025 at 5:25 PM
This shy creature, posing for our May Photo of the Month, is a horn shark (Heterodontus francisci), spotted near Catalina Island.
📷 Photo: Allie Smith, San Diego
Submit YOUR CA coast and ocean photo:
opc.ca.gov/2024/08/submit-photo
Read the May newsletter and subscribe: bit.ly/OPC-MAY-2025
📷 Photo: Allie Smith, San Diego
Submit YOUR CA coast and ocean photo:
opc.ca.gov/2024/08/submit-photo
Read the May newsletter and subscribe: bit.ly/OPC-MAY-2025
Baby shark! (🎶do-do do-do-do-do🎶) - horn shark (*Heterodontus francisci*) egg case spotted yesterday at Little Corona Beach, Corona Del Mar, Calif.)
August 5, 2023 at 2:02 PM
Baby shark! (🎶do-do do-do-do-do🎶) - horn shark (*Heterodontus francisci*) egg case spotted yesterday at Little Corona Beach, Corona Del Mar, Calif.)
The Port Jackson shark (Heterodontus portusjacksoni)has unusual chompers. Many sharks have blade-like teeth. This critter’s jaws have small pointed teeth in the front and broad flat ones in the back. Perfect for mollusks and crustaceans. The Port Jackson is found off the coast of Southern Australia.
July 28, 2025 at 2:42 PM
The Port Jackson shark (Heterodontus portusjacksoni)has unusual chompers. Many sharks have blade-like teeth. This critter’s jaws have small pointed teeth in the front and broad flat ones in the back. Perfect for mollusks and crustaceans. The Port Jackson is found off the coast of Southern Australia.
I can't be the only one who read this as "Heterodontus marshmallae," can I?
October 3, 2023 at 6:07 PM
I can't be the only one who read this as "Heterodontus marshmallae," can I?
#FishyFriday #SharkArt
Whale Shark (Rhincodon Typus)
Port Jackson Shark (Heterodontus Portusjacksoni)
Epaulette Shark (Hemiscyllium Ocellatum)
#WhaleShark #PortJacksonShark #EpauletteShark #Sharks #Fish #Protectwhatyoulove #Ocean #sealife #JulyArty #BskyArt #Artyear #Art
Whale Shark (Rhincodon Typus)
Port Jackson Shark (Heterodontus Portusjacksoni)
Epaulette Shark (Hemiscyllium Ocellatum)
#WhaleShark #PortJacksonShark #EpauletteShark #Sharks #Fish #Protectwhatyoulove #Ocean #sealife #JulyArty #BskyArt #Artyear #Art
July 25, 2025 at 2:50 PM
#FishyFriday #SharkArt
Whale Shark (Rhincodon Typus)
Port Jackson Shark (Heterodontus Portusjacksoni)
Epaulette Shark (Hemiscyllium Ocellatum)
#WhaleShark #PortJacksonShark #EpauletteShark #Sharks #Fish #Protectwhatyoulove #Ocean #sealife #JulyArty #BskyArt #Artyear #Art
Whale Shark (Rhincodon Typus)
Port Jackson Shark (Heterodontus Portusjacksoni)
Epaulette Shark (Hemiscyllium Ocellatum)
#WhaleShark #PortJacksonShark #EpauletteShark #Sharks #Fish #Protectwhatyoulove #Ocean #sealife #JulyArty #BskyArt #Artyear #Art
Oh! 🎶🎺🦈, I was thinking "horn shark" (Heterodontus francisci).
November 4, 2025 at 1:58 PM
Oh! 🎶🎺🦈, I was thinking "horn shark" (Heterodontus francisci).
Interestingly, this connection to the exterior allows some sharks to take sand particles into their inner ears to use as part of their otoliths (lumps of minerals that help with hearing and balance).
(Source: anatomypubs.onlinelibrary.wiley.com/doi/full/10.... )
(Source: anatomypubs.onlinelibrary.wiley.com/doi/full/10.... )
Exogenous Material in the Inner Ear of the Adult Port Jackson Shark, Heterodontus Portusjacksoni (Elasmbranchii)
Previous studies have suggested that the inner ear of some benthic species of elasmobranchs contain only exogenous material within their otoconial organs, a unique feature within vertebrates. However....
anatomypubs.onlinelibrary.wiley.com
January 5, 2025 at 1:01 AM
Interestingly, this connection to the exterior allows some sharks to take sand particles into their inner ears to use as part of their otoliths (lumps of minerals that help with hearing and balance).
(Source: anatomypubs.onlinelibrary.wiley.com/doi/full/10.... )
(Source: anatomypubs.onlinelibrary.wiley.com/doi/full/10.... )
they are believed to have “a great spatial memory”
https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/heterodontus-portusjacksoni/
https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/heterodontus-portusjacksoni/
April 25, 2023 at 11:36 AM
they are believed to have “a great spatial memory”
https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/heterodontus-portusjacksoni/
https://www.floridamuseum.ufl.edu/discover-fish/species-profiles/heterodontus-portusjacksoni/
Species Highlight: Port Jackson Shark (Heterodontus portusjacksoni)
🌍 Conservation Status: Least Concern
⚠️ Threats: Bycatch
📝 Registration and abstract submission for SI2026 is now open!
🔗 si2026.org
🌍 Conservation Status: Least Concern
⚠️ Threats: Bycatch
📝 Registration and abstract submission for SI2026 is now open!
🔗 si2026.org
October 22, 2025 at 9:04 AM
Species Highlight: Port Jackson Shark (Heterodontus portusjacksoni)
🌍 Conservation Status: Least Concern
⚠️ Threats: Bycatch
📝 Registration and abstract submission for SI2026 is now open!
🔗 si2026.org
🌍 Conservation Status: Least Concern
⚠️ Threats: Bycatch
📝 Registration and abstract submission for SI2026 is now open!
🔗 si2026.org
This beautiful embryo from a Port Jackson shark (Heterodontus portusjacksoni) goes back to 1977, when it was placed in a jar of ethanol by a very good friend of mine #elasmomorph #portjacksonshark #sharkembryo
April 18, 2024 at 8:42 PM
This beautiful embryo from a Port Jackson shark (Heterodontus portusjacksoni) goes back to 1977, when it was placed in a jar of ethanol by a very good friend of mine #elasmomorph #portjacksonshark #sharkembryo
Individual personality differences in Port Jackson sharks Heterodontus portusjacksoni
http://onlinelibrary.wiley.com/doi/10.1111/jfb.12993/abstract
http://onlinelibrary.wiley.com/doi/10.1111/jfb.12993/abstract
February 24, 2025 at 4:29 PM
Individual personality differences in Port Jackson sharks Heterodontus portusjacksoni
http://onlinelibrary.wiley.com/doi/10.1111/jfb.12993/abstract
http://onlinelibrary.wiley.com/doi/10.1111/jfb.12993/abstract
Feed: "Things I Get To I.D. At Work"
Published on Thursday, August 7, 2025
Published on Thursday, August 7, 2025
#1101 - Heterodontus portusjacksoni - Port Jackson Shark Egg
#1101 - Heterodontus portusjacksoni - Port Jackson Shark Egg drhoz: “The side-on photos didn’t turn out, which is aggravating, since the biggest difference between the eggs of Horn Sharks and...
drhoz.tumblr.com
August 7, 2025 at 7:53 AM
Feed: "Things I Get To I.D. At Work"
Published on Thursday, August 7, 2025
Published on Thursday, August 7, 2025
