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Spondylus
Spondylus
is a genus of bivalve molluscs, the only genus in the family Spondylidae. They are known in English as spiny oysters (though they are not, in fact, oysters) .

Contents

1 Description 2 Evolutionary history 3 Distribution 4 Ecology 5 Uses 6 Species 7 References 8 External links 9 Bibliography

Description[edit]

Spondylus varius
Spondylus varius
in Mayotte.

The many species of Spondylus
Spondylus
vary considerably in appearance and range. They are grouped in the same superfamily as the scallops. They are not closely related to true oysters (family Ostreidae); however, they do share some habits such as cementing themselves to rocks rather than attach themselves by a byssus. The two halves of their shells are joined with a ball-and-socket type of hinge rather than with a toothed hinge, as is more common in other bivalves. They also still retain vestigial anterior and posterior auricles ("ears", triangular shell flaps) along the hinge line, a common feature of scallops though not of oysters. Like all scallops, Spondylus
Spondylus
spp. have multiple eyes around the edges of their shells, and have relatively well-developed nervous systems. Their nervous ganglia are concentrated in the visceral region, with recognisable optic lobes connected to the eyes. Evolutionary history[edit] The genus Spondylus
Spondylus
appeared in the Mesozoic era
Mesozoic era
and it is known in the fossil records from the Triassic
Triassic
Cassian beds in Italy (235 to 232 years ago) on. About 40 extinct species are known.[1]

Fossil valve of Spondylus
Spondylus
crassicosta from the Pliocene
Pliocene
of Italy

These molluscs can be found in fossil shells all over the world. They are present in cretaceaous rocks in the Fort Worth Formation of Texas and in the Trent River Formation of Vancouver
Vancouver
as well as in other parts of North America.[2][3] Distribution[edit] Spiny oysters are found close in all subtropical and (especially) tropical seas, usually close to the coasts. Ecology[edit] Spondylus
Spondylus
adults are filter feeders that live cemented to hard substrates, a characteristic they share, by convergent evolution, with true oysters and jewel boxes. Like the latter, they are protected by spines and a layer of epibionts and, like the former, they can produce pearls.[4] The type of substrate depends on the species: many only attach to coral, and the largest diversity of species is found in tropical coral reefs; others, (particularly S. spinosus) however, easily adapt to man-made structures and have become important invasive species. Other still are often found attached to other shells, perhaps the most common belonging to the genus Malleus. Uses[edit] Archaeological evidence indicates that people in Neolithic
Neolithic
Europe
Europe
were trading the shells of S. gaederopus to make bangles and other ornaments throughout much of the Neolithic
Neolithic
period.[5] The main use period appears to have been from around 5350 to 4200 BC.[5] The shells were harvested from the Aegean Sea
Aegean Sea
but were transported far into the center of the continent. In the LBK
LBK
and Lengyel cultures, Spondylus shells from the Aegean Sea
Aegean Sea
were worked into bracelets and belt buckles. Over time styles changed with the middle neolithic favouring generally larger barrel-shaped beads and the late neolithic smaller flatter and disk shaped beads.[5] Significant finds of jewelry made from Spondylus
Spondylus
shells were made at the Varna Necropolis. During the late Neolithic
Neolithic
the use of Spondylus
Spondylus
in grave goods appears to have been limited to women and children.[5] S. crassisquama is found off the coast of Colombia
Colombia
and Ecuador
Ecuador
and has been important to Andean
Andean
peoples since pre-Columbian times, serving as both an offering to the Pachamama
Pachamama
and as currency.[6] In fact, much like in Europe, the Spondylus
Spondylus
shells also reached far and wide, as pre-Hispanic Ecuadorian peoples traded them with peoples as far north as present-day Mexico
Mexico
and as far south as the central Andes.[7] The Moche people of ancient Peru
Peru
regarded the sea and animals as sacred; they used Spondylus
Spondylus
shells in their art and depicted Spondylus
Spondylus
in effigy pots.[8] Spondylus
Spondylus
were also harvested from the Gulf of California and traded to tribes through Mexico
Mexico
and the American Southwest. Even today, there are collectors of Spondylus
Spondylus
shells, and a commercial market exists for them. Additionally, some species (especially S. americanus) are sometimes found in the saltwater aquariums. S. limbatus was commonly ground for mortar in Central America, giving raise to its junior synonym, "S. calcifer". Some Mediterranean species are edible and, in particular S. gaederopus, is commonly consumed in Sardinia. Tropical species, however, tend to bioaccumulate saxitoxin.[9] Species[edit] Spondylidae taxonomy has undergone many revisions,[10] mostly due to the fact that identification is traditionally based on the shell only, and this is highly variable. To add to this, while some shallow-water species are extremely common, at least two deep-water ones are known from a single specimen, while a third (S. gravis)[11] was only rediscovered after 77 years. At least another common species (S. regius) has a different shell when it grows in deep water.[12]

Pacific thorny oyster, S. crassisquama Lamarck, 1819, from the Gulf of California, Mexico

The interior of two fossil valves of Spondylus
Spondylus
from the Pliocene
Pliocene
of Cyprus

Cat's tongue oyster, Spondylus
Spondylus
linguaefelis Sowerby, 1847, from Hawaii

A view of the colorful mantle edges of a live thorny oyster from East Timor: The eyes can be seen on the fringe between the mantle and the shell.

A fossil Spondylus gaederopus
Spondylus gaederopus
from the Pliocene
Pliocene
of Cyprus

S. americanus Hermann, 1781 — Atlantic thorny oyster S. anacanthus Mawe, 1823 — nude thorny oyster S. asiaticus Chenu, 1844 S. asperrimus G. B. Sowerby II, 1847 S. aucklandicus P. Marshall, 1918 † S. avramsingeri Kovalis, 2010 S. butleri Reeve, 1856 S. candidus Lamarck, 1819 S. clarksoni Limpus, 1992 S. concavus Deshayes in Maillard, 1863 S. crassisquama Lamarck, 1819 S. croceus Schreibers, 1793 S. darwini Jousseaume, 1882 S. cumingii Sowerby, 1847 S. deforgesi Lamprell & Healy, 2001 S. depressus Fulton, 1915 S. eastae Lamprell, 1992 S. echinatus Schreibers, 1793 S. echinatus Schreibers, 1793 S. erectospinus Habe,1973 S. exiguus Lamprell & Healy, 2001 S. exilis G. B. Sowerby III, 1895 S. fauroti Jousseaume, 1888 S. foliaceus Schreibers, 1793 S. gaederopus Linnaeus, 1758 — European thorny oyster S. gloriandus Melvill & Standen, 1907 S. gloriosus Dall, Bartsch & Rehder, 1938 S. gravis Fulton, 1915 S. groschi Lamprell & Kilburn, 1995 S. gussoni O. G Costa, 1829 S. heidkeae Lamprell & Healy, 2001 S. imperialis Chenu, 1843 S. lamarckii Chenu, 1845 S. layardi Reeve, 1856 S. leucacanthus Broderip, 1833 S. limbatus G. B. Sowerby II, 1847 S. linguaefelis Sowerby, 1847 S. maestratii Lamprell & Healy, 2001 S. mimus Dall, Bartsch & Rehder, 1938 S. morrisoni Damarco, 2015 S. multimuricatus Reeve, 1856 S. multisetosus Reeve, 1856 S. nicobaricus Schreibers, 1793 S. occidens Sowerby, 1903 S. ocellatus Reeve, 1856 S. orstomi Lamprell & Healy, 2001 S. ostreoides E. A. Smith, 1885 S. pratii Parth, 1990 S. proneri Lamprell & Healy, 2001 S. raoulensis W. R. B. Oliver, 1915 S. reesianus G. B. Sowerby III, 1903 S. regius Linnaeus, 1758 — regal thorny oyster S. rippingalei Lamprell & Healy, 2001 S. rubicundus Reeve, 1856 S. senegalensis Schreibers, 1793 S. setiger Reeve, 1846 S. sinensis Schreibers, 1793 S. spinosus Schreibers, 1793 S. squamosus Schreibers, 1793 S. tenellus Reeve, 1856 S. tenuis Schreibers, 1793 S. tenuispinosus G. B. Sowerby II, 1847 S. tenuitas Garrard, 1966 S. varius Sowerby,1829 S. variegatus Schreibers, 1793 S. versicolor Schreibers, 1793 S. victoriae G. B. Sowerby II, 1860 S. violacescens Lamarck, 1819 S. virgineus Reeve, 1856 S. visayensis Poppe & Tagaro, 2010 S. zonalis Lamarck, 1819

References[edit]

^ Fossilworks ^ Finsley, Chalres. 1999. A Field Guide to the Fossils of Texas. Gulf Publishing. Lanham, Maryland. plate 55. ^ Ludvigsen, Rolf & Beard, Graham. 1997. West Coast Fossils: A Guide to the Ancient Life of Vancouver
Vancouver
Island. pg. 104 ^ WingYan Ho, Joyce; Zhou, Chunhui. "Natural Pearls
Pearls
Reportedly from a Spondylus
Spondylus
Species ("Thorny" Oyster)". GIA. Gemological Institute of America. Retrieved 24 February 2018.  ^ a b c d Gardelková-Vrtelová, Anna; Golej, Marián (2013). "The necklace from the Strážnice site in the Hodonín district (Czech Republic). A contribution on the subject of Spondylus
Spondylus
jewelry in the Neolithic". Documenta Praehistorica. Znanstvena založba Filozofske fakultete Univerze v Ljubljani. 40: 265–277. doi:10.4312/dp.40.21. Retrieved 2 December 2015.  ^ Carter, Benjamin. " Spondylus
Spondylus
in South American Prehistory" in Spondylus
Spondylus
in Prehistory: New Data and Approaches. Ed. Fotis Ifantidis and Marianna Nikolaidou. BAR International Series 2216. Oxford: Archaeopress, 2011: 63-89. ^ Shimada, Izumi. “Evolution of Andean
Andean
Diversity: Regional Formations (500 B.C.E-C.E. 600). The Cambridge History of the Native People of the Americas. Vol. III, pt. 1. Ed. Frank Salomon & Stuart B. Schwartz. Cambridge: Cambridge University Press, 1999: 350-517, esp. "Mesoamerican-Northwest South American Connections", pp. 430-436. ^ Katherine Berrin and Larco Museum. The Spirit of Ancient Peru: Treasures from the Museo Arqueológico Rafael Larco Herrera. New York: Thames and Hudson, 1997. ^ Montojo, U.M.; Sakamoto, S.; Cayme, M.F.; Gatdula, N.C.; Furio, E.F.; Relox, J.R.; Kodama, M. (2006). "Remarkable difference in toxin accumulation of paralytic shellfish poisoning toxins among bivalve species exposed to Pyrodinium bahamense var. compressum bloom in Masinloc bay, Philippines". Toxicon. 48: 85.  access-date= requires url= (help) ^ WoRMS Editorial Board. "Spondylus". World Register of Marine Species. doi:10.14284/170. Retrieved 19 February 2018.  ^ Lamprell, Kevin L. (May 1998). "Recent Spondylus
Spondylus
species from the Middle East and adjacent regions, with the description of two new species". Vita Marina. 45 (1-2): 58.  access-date= requires url= (help) ^ Poppe, Guido T. " Spondylus
Spondylus
regius, deep water". Shell Encyclopedia. Retrieved 19 February 2018. 

External links[edit]

Spondylidae pictures of the shells of most extant species. shells at the Rotterdam Natural History Museum Spondylus
Spondylus
Session Abstracts on Spondylus
Spondylus
research at the 13th Meeting of the European Association of Archaeologists at Zadar, Croatia, September 2007 Information about Spondylus
Spondylus
from the website of the Gladys Archerd Shell Collection at Washington State University Tri-Cities Natural History Museum Article on "notched" Spondylus
Spondylus
Neolithic
Neolithic
artifacts in Europe

Bibliography[edit]

A full and constantly updated bibliography on Spondylus
Spondylus
spp. in Aegean, Balkan, European and American contexts Lamprell, Kevin L.: Spondylus: Spiny Oyster
Oyster
Shells of the World, E. J. Brill, Leiden, 1987 ISBN 90 04 0839 4

Taxon identifiers

Wd: Q649156 ADW: Spondylus EoL: 57938 Fossilworks: 17044 iNaturalist: 123464 ITIS: 79778 NCBI: 10

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