Overview

Comprehensive Description

Brachidontes exustus is a member of the family Mytilidae. It has a thin, fan shaped shell with fine divercating radial ribs. The ribbed surface of the shell is most evident at the outer edges. Umbones are present at the extreme anterior end. The shell can range from blue-gray to yellow to dark brown. The interior has purple-brown blotches with one to four small purplish dysodont hinge teeth (Abbott and Morris 2001, Mekkelsen and Bieler 2008).Species designations in the genus Brachidontes are currently under revision (Berquist et al. 2006). A recent study of the Brachidontes exustus species complex in Florida suggests that there are four cryptic populations with distinct genetic profiles (Lee and O Foighil 2004).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Distribution

Gulf of Mexico
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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Brachidontes exustus occurs in the intertidal on rock surfaces. The scorched mussel has been recorded from New Jersey to Florida, Bermuda, Bahamas, West Indies, Gulf of Mexico, Caribbean Central America, South America to Argerntina, and St. Helena (Mekkelsen and Bieler 2008). It is commonly found washed ashore in clusters attached to other shells and seaweeds. Brachidontes exustus is commonly associated with oyster reefs in the Indian River Lagoon.
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Physical Description

Size

The scorched mussel grows to 10 - 46 mm in length (Mekkelsen and Bieler 2008).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Ecology

Habitat

Depth range based on 44 specimens in 1 taxon.
Water temperature and chemistry ranges based on 2 samples.

Environmental ranges
  Depth range (m): 0.1 - 33
  Temperature range (°C): 23.660 - 23.660
  Nitrate (umol/L): 0.457 - 0.457
  Salinity (PPS): 35.580 - 35.580
  Oxygen (ml/l): 4.845 - 4.845
  Phosphate (umol/l): 0.110 - 0.110
  Silicate (umol/l): 0.868 - 0.868

Graphical representation

Depth range (m): 0.1 - 33
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Habitat Type: Marine

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Migration

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

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Trophic Strategy

Brachidontes exustus are filter feeders (Riisg?rd 1988).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Population Biology

Brachidontes exustus is often the dominate mollusc in estuaries and mangrove roots (Barber et al. 2005).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Life History and Behavior

Reproduction

The scorched mussel is gonochronistic, having separate sexes. In a study of populations from Tampa Bay, Florida, the ratio of males to females is reported to be nearly 1:1. Brachidontes exustus has two spawning periods in the spring, between March and April and, in the fall, between September and November (Barber et al. 2005).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Growth

The embryology of the scorched mussel has not been well studied. However, other members in this family, such as Lithophaga bisulcata, Mytilus edulis, and Perna perna, have been well studied. The larvae of mytilid mussels appear to quickly develop into veligers followed by pediveligers (competent larvae) within a few weeks (Siddall 1980, Scott 1988a and b). Metamorphosis of the pedivleiger occurs once an appropriate area to settle is encountered (Siddall 1980, Scott 1988a).
  • ITIS. Integrated Taxonomic Information System. Available online.
  • Abbott RT and PA Morris. 2001. A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies pg. 17.American Museum of Natural History, Bivalves- Research, Training, and Electronic Dissemination of Data. Available online.
  • Barber BJ, Fajans JS, Baker SM and P Baker. 2005. Gametogenesis in the non-native green mussel, Perna viridis, and the native scorched mussel, Branchiodontes exustus, in Tampa Bay, Florida. Journal of Shellfish Research 24:1087-1095.
  • Berquist DC, Hale JA, Baker P and SM Baker. 2006. Development of ecosystem indicators for the Suwannee River estuary: oyster reef habitat quality along a salinity gradient. Estuaries and Coasts 29: 353-360.
  • Lee T and D O Foighil. 2004. Hidden Floridian biodiversity: mitochondrial and nuclear gene tree reveal four cryptic species within the scorched mussel, Branchiodontes exustus, species complex. Marine Ecology 13:3527-3542.
  • Mikkelsen PM and R Bieler. 2008. Seashells of Southern Florida. Princeton University Press, Princeton, NJ. pgs. 84-85.
  • Riisg?rd HU. 1988. Efficiency of particle retention and filtration rate in 6 species of Northeast American bivalves. Marine Ecology Progress Series 45:217-223.
  • Scott PJB. 1988a. Initial settlement behavior and survivorship of Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:97-108.
  • Scott PJB. 1988b. Distribution, habitat and morphaology of the Caribbean coral- and rock-boring bivalve, Lithophaga bisculata (d'Orbigny) (Mytilidae:Lithophaginae). Journal of Molluscan Studies 54:83-95.Siddall SE. 1980. A classification of the genus Perna (Mytlidae). Bulletin of Marine Science 30:858-870.
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Source: Indian River Lagoon Species Inventory

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Molecular Biology and Genetics

Molecular Biology

Barcode data: Hormomya exustus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 94 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

ACACTTTATTTAGTTTTTGGTATTTGAAGTGGTTTGGCGGGAGTTGGCTATAGAATATTAATTCGTTTGCATTTGATACATCCTGGTAATTTCTTGTTGAAATCAGATAGTCTATACAACGTGATTGTGACTACACATGCTTTAGTTATAATTTTTTTCGCGGTAATGCCTTTACTTATTGGTGCTTTTGGTAACTGGCTTATTCCTTTAATAATTGGTGCTATAGACCTTGCTTTCCCGCGTGTTAATAATTTTAGTTTTTGAATTCTGCCTAGTGCCTTTTATTTATTATTATTATCAGGTTATGTGGAAGAAGGAGTAGGGACTGGTTGGACTATTTATCCTCCTTTATCTACTGTAGAATACCATAGAAGCCCTGCGATGGATCTTGCTATTTTATCACTTCGTTTAGCAGGTTCTGGGTCTTTAATAGGCGCTATTAATTTCTTAACCTCTAATAAAAATCTTCCTGTTAATAAAATAAAGGGAGAGCGATCTGTCCTGTATGTATGAAGAATCACGGTTACAGCCTTCTTGTTGCTGTTATCTTTACCGGTTTTAGCAGGAGCCATCACTATACTGTTGTTTGATCGTAATTTTAATACCACATTTTACGATCCAATCGGAGGAGGAGATCCTGTGTTATTTATACATCTTTTT
-- end --

Download FASTA File
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Statistics of barcoding coverage: Hormomya exustus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 94
Specimens with Barcodes: 94
Species With Barcodes: 1
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Genomic DNA is available from 2 specimens with morphological vouchers housed at British Antarctic Survey
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N5 - Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

Reasons: This is a common marine species (Abbott, 1958).

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Wikipedia

Brachidontes exustus

Brachidontes exustus, or the scorched mussel, is a species of bivalve mollusc in the family Mytilidae. It can be found along the Atlantic coast of North America, ranging from Cape Hatteras to the West Indies and Brazil.[1]

References

  1. ^ Abbott, R.T. & Morris, P.A. A Field Guide to Shells: Altantic and Gulf Coasts and the West Indies. New York: Houghton Mifflin, 1995. 17.


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