Black Sea Hare

Black Sea Hare (Aplysia vaccaria)

Black Sea Hare

Where found:  Low tide zone up to upper tidepools. Similar to California Sea Hare but is deep purplish black instead of brownish gray.

Interesting facts:  A sea hare is a mollusc, related to snails, but without the conspicuous outer shell. They have a tremendous internal shell. It does not squirt “ink” in contrast to the California Sea Hare. This species has few natural predators and holds the size record for sea hares, up to 30 inches in length and up to 35 pounds. The species name is descriptive, referring to its cow-like attributes, since vaccaria refers to cow-house or pasture in Latin.

Adaptations:  Aplysia breathe with the help of two fleshy flaps that extend over the back and are flapped and create currents to force water over the gills.

Food:  Aplysia eat algae. They sense the food at a distance and cut it up with their radula. They use three stomachs, two of which have grinding “teeth” inside.

Life history:  Aplysia is hermaphroditic, with both male and female sex organs. Fertilization is internal and copulation lasts several hours to several days. Mating occurs year-round, but is concentrated in the late spring to late fall. Eggs are deposited in stringy yellow masses, with on the order of 80 million eggs per mass. One egg mass was unraveled in a lab and was 1/3 of a mile long! Within 12 days the eggs hatch to free swimming larvae that are planktonic for approximately a month. Settlement usually occurs on or near red algae. The animals grow quickly, and within a year are usually full-grown. They usually don’t live much longer than a year.

Phylum:           Mollusca (Soft-bodied animals with external shells or modified internal       shells)
Class:              Gastropoda (Snails, Limpets, Sea hares, Nudibranchs, etc.)
Subclass:         Opisthobranchia (Nudibranchs, Sea hares, Sea slugs, etc.)
Order:             Anaspidea
Family:            Aplysiidae

J&W Tam

Black Sea Hare Facts

  • Impressively, the truly stunning Black Sea Hare represents an extremely large species of animal known as a sea slug. For the moment, a total of roughly 3,000 recognized varieties of such creatures exist. That’s an astounding number.
  • This creature forms the largest all of presently known related species. Yet, its superior size alone does not constitute its only difference from related creatures. Nature, it would seem, chose to set it apart from its brethren in more ways than one.
  • This holds true, in part, because unlike most of its brethren, this remarkable sea slug actually does not produce ink. In addition to this, its evolved defensive measures, which are quite impressive, also set it apart from similar creatures.
  • Since it lacks ink, the invertebrate protects itself from predators by making its flesh undesirable to them. While other species also do this, it approaches it from an unusual angle. This occurs due to the fact that its principle food source contains natural toxins.
  • The magnificent Black Sea Hare, however, evolved a natural immunity to such poisons. As a result of its consumption of the animals, the toxin builds up concentrations in its flesh sufficient to make it lethal to potential predators.

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