Ένα είδος σπόγγου που θυμίζει γλυπτό σύγχρονης τέχνης έχει εγκαταλείψει τις διατροφικές συνήθειές της οικογένειάς του και προτιμά να τρέφεται με μικρές γαρίδες.
In this video we describe a
new species of carnivorous sponge, Chondrocladia lyra from the deep-sea off
California. C. lyra is called the harp sponge because its basic structure,
called a vane, is shaped like a harp or lyre. Each vane consists of a horizontal
branch supporting several parallel, vertical branches. Clinging with root-like
"rhizoids" to the soft, muddy sediment, the harp sponge captures tiny
animals that are swept into its branches by deep-sea currents. Typically,
sponges feed by straining bacteria and bits of organic material from the
seawater they filter through their bodies. However, carnivorous harp sponges
snare their prey—tiny crustaceans—with barbed hooks that cover the sponge's
branching limbs. Once the harp sponge has its prey in its clutches, it envelops
the animal in a thin membrane, and then slowly begins to digest it. The harp
sponge's unusual shape and exposure to currents may also help it to reproduce
more effectively. The swollen balls at the tip of the sponge's upright branches
produce packets of sperm. These sperm packets are released into passing
currents and are captured on the branches of other nearby sponges. The sperm
then works its way from the packets into the host sponge to fertilize its eggs.
As the fertilized eggs mature, these contact sites swell up, forming bulges
part way up the host sponge's branches (see photo). MBARI article: http://www.mbari.org/scientists-disco... Publication
reference: Lee, W. L., Reiswig, H. M., Austin, W. C. and Lundsten, L. (2012),
An extraordinary new carnivorous sponge, Chondrocladia lyra, in the new
subgenus Symmetrocladia (Demospongiae, Cladorhizidae), from off of northern
California, USA. Invertebrate Biology. doi: 10.1111/ivb.12001


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