Information about Mermaid's Purse
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A mermaid's purse on Trefor beach, North Wales.
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A Port Jackson shark's egg case. The screw-like helical flanges help the mother shark to secure the egg within rock crevices.
Mermaid's purses (also known as Devil's Purses) are the normally empty egg cases of dogfish, skates, sharks and rays. They are among the objects which are washed in by the sea, and can be found at the strandline, which is the furthest point of the highest tide.
The size of mermaid's purses vary; those of the small-spotted catshark or lesser spotted dogfish, Scyliorhinus canicula, are around 5 cm long, while those of the greater spotted dogfish, S. stellaris, are around 10 cm. That excludes the four long tendrils found in each corner, which assist in anchorage. Mermaid's purses from rays vary in that they have points rather than tendrils. The colour and shape of mermaid's purses also varies greatly from species to species.
The young fish would normally gestate between 6 to 12 months, but can be much longer for deep sea catsharks which lay their eggs in very cold water.
If a mermaid's purse is still moist (not dried out) and has no visible hole, it is probably still occupied, and should be returned to the sea.
In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. To enable incubation the egg is usually kept within a favourable temperature range as it nourishes and protects the growing embryo.
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dogfish is applied to a number of small sharks found in the northeast Atlantic, Pacific, and Mediterranean, especially those in the three families Scyliorhinidae, Dalatiidae and Squalidae.
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Rajidae
Skates are cartilaginous fish belonging to the family Rajidae in the superorder Batoidea of rays. They are carnivorous, feeding mostly on smaller fish and crustaceans.
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Skates are cartilaginous fish belonging to the family Rajidae in the superorder Batoidea of rays. They are carnivorous, feeding mostly on smaller fish and crustaceans.
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SHARK
General
Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, Erik De Win
1996
KHAZAD, Rijndael
Cipher detail
Key size(s):| 128 bits
Block size(s):| 64 bits
Substitution-permutation network
6
In cryptography,
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General
Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, Erik De Win
1996
KHAZAD, Rijndael
Cipher detail
Key size(s):| 128 bits
Block size(s):| 64 bits
Substitution-permutation network
6
In cryptography,
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Batoidea
Orders
Rajiformes - common rays and skates
Pristiformes - sawfishes
Torpediniformes - electric rays
See text for families.
Batoidea
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Orders
Rajiformes - common rays and skates
Pristiformes - sawfishes
Torpediniformes - electric rays
See text for families.
Batoidea
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mermaid (from the Middle English mere in the obsolete sense 'sea' (as in maritime, the Latin mare, "sea") + maid(en)) is a legendary aquatic creature with the head and torso of human female and the tail of a fish.
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S. canicula
Binomial name
Scyliorhinus canicula
(Linnaeus, 1758)
The small-spotted catshark or lesser spotted dogfish, Scyliorhinus canicula
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Binomial name
Scyliorhinus canicula
(Linnaeus, 1758)
The small-spotted catshark or lesser spotted dogfish, Scyliorhinus canicula
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1 centimetre =
SI units
010−3 m 0 mm
US customary / Imperial units
010−3 ft 0 in
A centimetre (American spelling: centimeter, symbol cmSI units
010−3 m 0 mm
US customary / Imperial units
010−3 ft 0 in
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S. stellaris
Binomial name
Scyliorhinus stellaris
(Linnaeus, 1758)
The nursehound, greater spotted dogfish or bull huss, Scyliorhinus stellaris
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Binomial name
Scyliorhinus stellaris
(Linnaeus, 1758)
The nursehound, greater spotted dogfish or bull huss, Scyliorhinus stellaris
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tendril is a specialized stem, leaf or petiole with a threadlike shape that is used by climbing plants for support and attachment, generally by twining around whatever it touches.
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