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Northern Rock Barnacle (Adults, Juveniles, and Cypris) - Semibalanus balanoides The adults are the large barnacles to the right. The juveniles are the smaller ones in the middle. And, the cypris are the brownish, ovalish specks to the left in the photo. <br /> <br /> Northern rock barnacles are hermaphrodites, but cannot fertilize themselves. Copulation is followed by internal fertilization. The eggs (up to 10,000!) remain inside the shell. The eggs hatch into free-swimming larvae, which is followed by a unique cypris larval stage. The cypris larvae spend their time seeking a habitable substrate. Once it settles on a spot, it metamorphoses into its adult form, but is called a &quot;juvenile&quot; as it is much smaller than its ultimate size will be.<br /> <br /> Habitat: Low tide zone<br /> <figure class="photo"><a href="https://www.jungledragon.com/image/89871/northern_rock_barnacle_cypris_larvae_-_semibalanus_balanoides.html" title="Northern Rock Barnacle (Cypris Larvae) - Semibalanus balanoides"><img src="https://s3.amazonaws.com/media.jungledragon.com/images/3232/89871_thumb.jpg?AWSAccessKeyId=05GMT0V3GWVNE7GGM1R2&Expires=1681948810&Signature=PRUMf9F5onItgpRnsYmpWcDUqVE%3D" width="118" height="152" alt="Northern Rock Barnacle (Cypris Larvae) - Semibalanus balanoides The cypris larvae are the brownish, ovalish specks to the left in the photo.<br /> <br /> Northern rock barnacles are hermaphrodites, but cannot fertilize themselves. Copulation is followed by internal fertilization. The eggs (up to 10,000!) remain inside the shell. The eggs hatch into free-swimming larvae, which is followed by a unique cypris larval stage. The cypris larvae spend their time seeking a habitable substrate. Once it settles on a spot, it metamorphoses into its adult form, but is called a &quot;juvenile&quot; as it is much smaller than its ultimate size will be.<br /> <br /> Habitat: Low tide zone<br /> https://www.jungledragon.com/image/89870/northern_rock_barnacle_adults_juveniles_and_cypris_-_semibalanus_balanoides.html Geotagged,Semibalanus balanoides,Spring,United States,barnacle,barnacle cypris,cypris,larvae" /></a></figure> Cyprid,Geotagged,Semibalanus balanoides,Spring,United States,cypris Click/tap to enlarge Promoted

Northern Rock Barnacle (Adults, Juveniles, and Cypris) - Semibalanus balanoides

The adults are the large barnacles to the right. The juveniles are the smaller ones in the middle. And, the cypris are the brownish, ovalish specks to the left in the photo.

Northern rock barnacles are hermaphrodites, but cannot fertilize themselves. Copulation is followed by internal fertilization. The eggs (up to 10,000!) remain inside the shell. The eggs hatch into free-swimming larvae, which is followed by a unique cypris larval stage. The cypris larvae spend their time seeking a habitable substrate. Once it settles on a spot, it metamorphoses into its adult form, but is called a "juvenile" as it is much smaller than its ultimate size will be.

Habitat: Low tide zone

Northern Rock Barnacle (Cypris Larvae) - Semibalanus balanoides The cypris larvae are the brownish, ovalish specks to the left in the photo.<br /> <br /> Northern rock barnacles are hermaphrodites, but cannot fertilize themselves. Copulation is followed by internal fertilization. The eggs (up to 10,000!) remain inside the shell. The eggs hatch into free-swimming larvae, which is followed by a unique cypris larval stage. The cypris larvae spend their time seeking a habitable substrate. Once it settles on a spot, it metamorphoses into its adult form, but is called a "juvenile" as it is much smaller than its ultimate size will be.<br /> <br /> Habitat: Low tide zone<br /> https://www.jungledragon.com/image/89870/northern_rock_barnacle_adults_juveniles_and_cypris_-_semibalanus_balanoides.html Geotagged,Semibalanus balanoides,Spring,United States,barnacle,barnacle cypris,cypris,larvae

    comments (3)

  1. View Ferdy Christant's profile
    Ferdy Christant
    Lion
    View Lion class
    You made me realize I never really read much about barnacles so now did a bit of it, they are so cool and what amazing specialism and life cycle they have, truly weird creatures. Posted 3 years ago
    1. View Christine Young's profile
      Christine Young
      Lion
      View Lion class
      They are really cool! I took photos and a video of them feeding, but haven't gotten that far in this set of photos. Posted 3 years ago
      1. View Ferdy Christant's profile
        Ferdy Christant
        Lion
        View Lion class
        Sweet, I'll wait. Posted 3 years ago

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The Northern Rock Barnacle

''Semibalanus balanoides'' is a common and widespread boreo-arctic species of acorn barnacle. It is common on rocks and other substrates in the intertidal zone of north-western Europe and both coasts of North America.

Info 14 1
Similar species: Symmetrical Sessile Barnacles
Species identified by Christine Young
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By Christine Young

All rights reserved
Uploaded Feb 13, 2020. Captured Jun 18, 2019 08:08 in 1563 Post Rd, Wells, ME 04090, USA.
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  • Canon EOS 80D
  • f/4.5
  • 1/332s
  • ISO100
  • 100mm