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You are viewing an archived site. The Chesapeake Bay Introduced Species Database project ended in 2020 and the database is no longer receiving updates. Learn more…
Image of Teredo furcifera

Teredo furcifera

Mollusks-Bivalves

Forked Shipworm

Shipworms may look like worms with their long tubular bodies, but they are actually bivalves like clams. Instead of living in their shells, they use them to burrow into wood to create a home. This tropical species was first described in Indonesia in 1894 and is now widely distributed. Like many shipworms, it moved around the world in the hulls of wooden sailing ships. The first report of the Forked Shipworm on the East Coast was from North Carolina in the 1940s. Because it is so widespread, there is some uncertainty as to its introduced status south of Cape Hatteras. It was introduced into the Chesapeake Bay region in 1988 where it was discovered in submerged pine planks in Wachapreague VA. Although it is unlikely to survive winters in this region, it is one of several tropical species that is transported north by boats traveling up the coast. In 1960 it arrived in New York on the Bounty II, a wooden sailboat built for the movie “Mutiny on the Bounty”, which had been in Tahiti.

Image Credit: USGS

Taxonomy Invasion History Ecology Impacts References

Description


Taxonomy

Kingdom Phylum Class Order Family Genus
Animalia Mollusca Bivalvia Myoida Teredinidae Teredo

Synonyms

Teredo australasiatica; Teredo bensoni; Teredo furcata; Teredo furcillatus; Teredo krappei; Teredo laciniata; Teredo parksi; Teredo parksi madrasensis

Invasion History

Chesapeake Bay Status

First Record Population Range Introduction Residency Source Region Native Region Vectors
1988 Unknown Unknown Introduced Regular Resident Western Atlantic Unknown-Marine Shipping(Fouling Community)

History of Spread

The tropical shipworm Teredo furcifera was described from Indonesia in 1894, and is now cosmopolitan (Turner 1966; Turner 1971). In the marine borer surveys, done for the U.S. Navy by the W. F. Clapp laboratories, T. furcifera (including synonyms) was reported from Japan, Phillipines, Guam, Hawaii, the Panama Canal Zone, Cuba, Trinidad, Puerto Rico, Virgin Islands, Florida, and Bermuda (Wallour 1960). A few specimens were collected in Port Hueneme, California and the Gulf of California (undated collections, Museum of Comparative Zoology 2009), probably in Clapp Laboratory surveys (1940-1960).

East Coast,- On the East Coast, this shipworm was collected from Wilmington, NC, in 1941 (Museum of Comparative Zoology 2009), and was collected from the Atlantic and Gulf coasts from Fort Pierce, FL to Corpus Christi, TX (Wallour 1960). It was not mentioned in an earlier shipworm survey (Brown 1953). We consider this shipworm to be cryptogenic in the subtropical Northwest Atlantic (Carlton and Ruckelshaus 1997). Florida occurrences included Key West, Tampa, Panama City, Miami and Fort Pierce (Wallour 1960). Several occurrences North of Cape Hatteras are likely to represent local introductions by shipping or by yacht traffic.

Oyster Bay (NY) Barnegat Bay (NJ)- Teredo furcifera was collected in 1963 from the wooden sailing ship 'Bounty II', built for the remake of the movie 'Mutiny on the Bounty' which had been docked over the winter in Oyster Bay, Long Island, NY, following a long voyage (2 years) from Tahiti. The worm tubes were filled with larval shells, indicating that larvae had been brooded but not released (Turner 1966). Teredo furcifera was seen again in Barnegat Bay NJ in 1974, following the start-up of the Oyster Creek Nuclear Power Plant in 1969. However, it became scarce in later years, and was not found in 1979 (Hoagland and Turner 1980).

Chesapeake Bay reion- Teredo furcifera was collected in 1988 and 1989 in pine planks exposed to seawater at Wachapreague VA, at the mouth of Burtons Bay on the Atlantic Coast (McGovern and Burreson 1990). Identifications were made in Ruth Turner's laboratory at Harvard University (Burreson 1998, personal communication). This shipworm was not found north of Florida in previous surveys (Wallour 1960).

History references- Wallour 1960; Turner 1966; Turner 1971; Hoagland and Turner 1980; McGovern and Burreson 1990; Carlton and Ruckelshaus 1997; Burreson 1998; Museum of Comparative Zoology 2009)

Invasion Comments

Ecology

Environmental Tolerances

For SurvivalFor Reproduction
Minimum Maximum Minimum Maximum
Temperature (ºC) 33.0
Salinity (‰) 6.0 6.0 35.0
Oxygen anoxic
pH
Salinity Range meso-eu

Age and Growth

Male Female
Minimum Adult Size (mm)
Typical Adult Size (mm) 150.0
Maximum Adult Size (mm)
Maximum Longevity (yrs)
Typical Longevity (yrs

Reproduction

Start Peak End
Reproductive Season
Typical Number of Young
Per Reproductive Event
Sexuality Mode(s)
Mode(s) of Asexual
Reproduction
Fertilization Type(s)
More than One Reproduction
Event per Year
Reproductive Startegy
Egg/Seed Form

Impacts

Economic Impacts in Chesapeake Bay

The abundance, and the importance of Teredo furcifera as a wood-borer, are unknown in the Chesapeake Bay region.


Economic Impacts Outside of Chesapeake Bay

Teredo furcifera is an important woodborer in subtropical and tropical waters around the world (Wallour 1960; Turner 1971).

References- Wallour 1960; Turner 1971


Ecological Impacts on Chesapeake Native Species

Impacts of Teredo furcifera (Bartsch's Shipworm) on native biota, such as the shipworm Bankia gouldi (Gould's Shipworm), are probably limited by T. furcifera's rare occurence in the Chesapeake Bay region.


Ecological Impacts on Other Chesapeake Non-Native Species

Impacts of Teredo furcifera are probably limited by this species' rare occurrence in the Bay. Competition with T. navalis (Naval Shipworm) is likely where warm effluents permits the development of dense populations, but this has not been documented for Chesapeake Bay or elsewhere.

Food/prey- Teredo furcifera serves a host for the cryptogenic haplosporidian parasite Minchinia teredinis (Hillman 1978; McGovern and Burreson 1990).

References- Hillman 1978; McGovern and Burreson 1990


References

Bartsch, Paul (1922) A monograph of the American shipworms, United States National Museum Bulletin 122: 1-48

Brown, Dorothy J. (1953) Sixth Progress Report on marine borer activity in test boards operated during 1952, Report No. 8511 , Duxbury, Massachusetts. Pp.

Carlton, James T. (1992) Introduced marine and estuarine mollusks of North America: An end-of-the-20th-century perspective., Journal of Shellfish Research 11: 489-505

Carlton, James T.; Ruckelshaus, Mary H. (1997) Nonindigenous marine invertebrates and algae of Florida, In: Simberloff, Daniel, Schmitz, Don C., Brown, Tom C.(Eds.) Strangers in Paradise: Impact and Management of Nonindigenous Species in Florida. , Washington, D.C.. Pp. 187-201

Hillman, Robert E. (1978) Occurrence of Minchinia sp. (Haplosporidia, Haplosporidiidae) in species of the molluscan borer, Teredo, from Barnegat Bay, New Jersey, Journal of Invertebrate Pathology 31: 265-266

Hillman, Robert E.; Ford Susan E.; Haskin, Harold H. (1990) Minchinia teredinis n. sp. (Balanosporida, Haplosporidiidae), a parasite of teredinid shipworms, Journal of Protozoology 37: 364-368

Hoagland, K. E.; Turner, R. D. (1980) Range extensions of teredinids (shipworms) and polychaetes in the vicinity of a temperate-zone nuclear generating station., Marine Biology 58: 55-64

Karande, Ashok A. (1966) On the laboratory settlement of the marine wood borer, Teredo furcifera, Science and Culture 32: 380-381

McGovern, Elizabeth R.; Burreson, Eugene M. (1990) Ultrastructure of Minchinia sp. spores from shipworms (Teredo sp.) in the western North Atlantic, with discussion of taxonomy of the Haplosporidiidae, Journal of Protozoology 37: 212-218

Richards, Beatrice R.; Hillman, Robert E.; Maciolek, Nancy J. (1984) Shipworms, In: Kennish, Michael J.; Lutz, Richard A.(Eds.) Lecture Notes on Coastal and Estuarine Studies - Ecology of Barnegat Bay, New Jersey. , New York. Pp. 201-225

Scheltema, Rudolf S.; Truitt, R. V. (1956) The shipworm Teredo navalis in Maryland coastal waters, Ecology 37: 841-843

Turner, R. D.; Johnson, A. C. (1971) Biology of marine wood-boring molluscs., , Paris. Pp. 259-301

Turner, Ruth D. (1966) A survey and illustrated catalogue of the Teredinidae (Mollusca: Bivalvia), , Cambridge. Pp.

Turner, Ruth D. (1971) Identification of marine wood-boring molluscs., , Paris. Pp.

Turner, Ruth D. (1984) An overview of research on marine borers: past progress and future direction., In: Costlow, J.D./Tipper, R. C.(Eds.) Proceedings of the Symposium on Marine Biodeterioration. , Annapolis, MD. Pp.

Wallour, Dorothy Brown (1960) Thirteenth progress report on marine borer activity in test boards operated during 1959, , Duxbury, Massachusetts. Pp. 1-41


Direct questions and comments to chesnemo@si.edu.

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