45 votes

I am trying to identify this bone I found on the beach at the Delaware Bay in Delaware. It is 2 1/2 inches wide and 1 1/2 tall

It's a pharyngeal tooth from a large fish like a drum or a parrot fish. The pharyngeal jaws are for grinding and also contain a pharyngeal mill, where larger and smaller teeth grind coarser and finer ...
bandybabboon's user avatar
  • 10.4k
25 votes
Accepted

Identify blue/translucent jelly-like animal on beach

By-the-wind sailors This appears to be Velella (a monospecific genus), commonly referred to as by-the-wind sailor. More specifically, this is Velella velella, and is also less commonly referred to ...
theforestecologist's user avatar
8 votes

What are these semi transparent pill-shaped things in the Mediterranean Sea?

Quick guess based on your low-quality photo: Reminds me of a pyrosome, a tube/rod-shaped, free floating colonial tunicate. According to here, Pyrosoma atlanticum is the only species found in the ...
theforestecologist's user avatar
5 votes
Accepted

Why are beavers not considered marine mammals?

Beavers are not Marine Mammals According to Wikipedia, Marine is an adjective meaning of or pertaining to the sea or ocean: as Beavers can be found in a number of freshwater habitats, such as rivers, ...
J..y B..y's user avatar
  • 194
4 votes

What is the origin of the name Crassostrea gigas (pacific oyster)?

As I see it, it went down like this: 1753: Linné describes the genus Ostrea 1793: Thunberg describes an Oyster as gigas and puts it in that genus -> Ostrea gigas (Thunberg, 1793) That is the ...
nika's user avatar
  • 189
3 votes
Accepted

Why are polar seas rich with nutrients and plankton?

Water density and temperature is very important for understanding water ecosystems. Water is most dense a little above freezing temperature; when surface water is warmer than that, it's less dense and ...
Bryan Krause's user avatar
  • 45.7k
3 votes
Accepted

Is there a database for fossilized coral reefs that have been reported?

Yes, have a read from: The Paleobiology Database (PBDB): A comprehensive online resource that compiles data on fossil occurrences from various scientific publications and databases. The Ocean ...
bandybabboon's user avatar
  • 10.4k
2 votes

Why is oxygen used up in eutrophication?

Much like how planes fly, a proper explanation to this question is more nuanced and complex than first appears... The total algae lifecycle is oxygen neutral When any plant or algae grows sunlight is ...
Kevin Kostlan's user avatar
2 votes

What is the origin of the name Crassostrea gigas (pacific oyster)?

@nika identifies the original description of the species as Ostrea gigas Thunberg 1793. They also identify creation of the subgenus Crassostrea Sacco 1897, which I believe, according to the rules of ...
Darlingtonia's user avatar
  • 2,582
1 vote
Accepted

What type of shell is this?(Answered)

It's a Tube Worm. Calcareous Tube Worm, Vancouver Island, BC, Photo By Bud Logan From Gohiking.ca. They anchor themselves to rocks, or animal shells, poking out their filter-feeding aparatus which ...
Jiminy Cricket.'s user avatar

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