Overview

Comprehensive Description

Biology/Natural History:

Yoldia is one of a group of "primitive" "Protobranch" bivalves which are different structurally from other bivalves. Most protobranchs live with the anterior end down in sediment. They have two small, bipectinate gills on the posterior end. Water is circulated from the anterior end toward the posterior end and across the gills, rather than in at the posterior ventral end, across the gills, and out at the posterior dorsal end as in most clams. The protobranchs usually have long extensions of the mouth called labial palps, which they extend into the sediment and pick up particles for feeding. Some Protobranchs, including Yoldia, also have a small flattened "sole" on their foot. The sole has left and right halves which can be folded together to collapse the foot into a narrow profile. The foot is then inserted into the sediment, the sole is unfolded to its wide configuration, and the foot is retracted to draw the clam down into the sediment.

Members of Subclass Palaeotaxodonta have equal valves with taxodont dentition and protobranch (bipectinate) gills.

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Source: Invertebrates of the Salish Sea

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Clams in Order Nuculoida have valves similar to one another. The hinge plate has taxodont dentition (photo). The shell is aragonitic, longer than high and has no radial ribs. The periostracum is smooth. They are protobranchs, so their gills are simple platelike leaflets suspended in the mantle cavity. They have large palps near the mouth which they use to gather food. Members of Family Yoldiidae have an external hinge ligament, the interior of the valves is not pearly, they have siphons and a pallial sinus, they have a chondrophore, the shell gapes at the posterior end, and they have taxodont dentition. Yoldia myalis has a rather flat (not swollen) shell, concentric growth lines but no other concentric sculpture, the umbone is in the middle of the shell, and the length of the shell is less than twice the height. The anterior end is rounded, while the posterior is bluntly pointed. Brown or dark green periostracum. The interior is yellowish-white.
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Source: Invertebrates of the Salish Sea

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Distribution

Labrador to Massachusetts; Alaska to Puget Sound, Washington
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Geographical Range: Arctic Ocean to Puget Sound, North Atlantic

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Source: Invertebrates of the Salish Sea

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Physical Description

Look Alikes

How to Distinguish from Similar Species: Yoldia amygdalea has umbones posterior to the middle and the length is twice the height. Yoldia seminuda has concentric lines crossing the growth lines. Yoldia thraciaeformis has a swollen shell.
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Source: Invertebrates of the Salish Sea

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Ecology

Habitat

intertidal, bathyal, infralittoral and circalittoral of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Depth range based on 84 specimens in 1 taxon.
Water temperature and chemistry ranges based on 35 samples.

Environmental ranges
  Depth range (m): 7 - 142
  Temperature range (°C): 4.685 - 8.018
  Nitrate (umol/L): 7.379 - 23.221
  Salinity (PPS): 32.125 - 33.965
  Oxygen (ml/l): 3.625 - 6.775
  Phosphate (umol/l): 0.897 - 2.182
  Silicate (umol/l): 5.571 - 51.234

Graphical representation

Depth range (m): 7 - 142

Temperature range (°C): 4.685 - 8.018

Nitrate (umol/L): 7.379 - 23.221

Salinity (PPS): 32.125 - 33.965

Oxygen (ml/l): 3.625 - 6.775

Phosphate (umol/l): 0.897 - 2.182

Silicate (umol/l): 5.571 - 51.234
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Yoldia myalis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Source: Barcode of Life Data Systems (BOLD)

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Wikipedia

Yoldia myalis

Yoldia myalis, or the comb yoldia, is a clam in the family Yoldiidae. It can be found along the Atlantic coast of North America, ranging from Labrador to Massachusetts, as well as along the Alaskan coast.[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. 6.


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