Animalscaretips
All mollusks are protostomes, so bivalves, which are mollusks, are also protostomes. The differences between protostomes and deuterostomes occurs...
- Are clams Deuterostomes or protostomes?
- Are bivalves cephalized?
- How do bivalves eat food?
- What kind of sensory structures do bivalves have?
- Are chordates protostomes or deuterostomes?
- What organisms are deuterostomes?
- Are bivalves invertebrates?
- Are cnidarians cephalized?
- Are crustaceans cephalized?
- Do bivalves feel pain?
- Are bivalves vegan?
- Do bivalves have eyes?
- What are characteristics of bivalves?
- Do molluscs have tissue?
- What type of reproduction do molluscs have?
Are clams Deuterostomes or protostomes?
Animals in the phylum Mollusca include clams, snails, octopuses, and sea slugs (pictured right). They are all protostome coelomates.
Are bivalves cephalized?
For example, bivalves are not particularly cephalized (although some scientists have argued that they are "all head"). However, as with the echinoderms, certain mollusks regained cephalization. ... Their sense organs, including well-developed eyes and a brain, are concentrated in a distinct head region.
How do bivalves eat food?
Like fish, bivalve mollusks breathe through their gills. As filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable "foot" that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow.
What kind of sensory structures do bivalves have?
The sensory organs of bivalves are not well developed and are largely located on the posterior mantle margins. The organs are usually mechanoreceptors or chemoreceptors, in some cases located on short tentacles. The chemoreceptor cells taste the water and are sensitive to touch.
Are chordates protostomes or deuterostomes?
The majority of animals more complex than jellyfish and other Cnidarians are split into two groups, the protostomes and deuterostomes. Chordates (which include all the vertebrates) are deuterostomes.
What organisms are deuterostomes?
Deuterostomia, (Greek: “second mouth”), group of animals—including those of the phyla Echinodermata (e.g., starfish, sea urchins), Chordata (e.g., sea squirts, lancelets, and vertebrates), Chaetognatha (e.g., arrowworms), and Brachiopoda (e.g., lamp shells)—classified together on the basis of embryological development ...
Are bivalves invertebrates?
Bivalves belong to the invertebrate phylum Mollusca, which also includes snails, squids, and octopuses. Some well-known bivalves include clams, scallops, mussels, and oysters. More than 15,000 species of bivalves exist. All bivalves are aquatic, encompassing both marine and fresh-water species.
Are cnidarians cephalized?
Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).
Are crustaceans cephalized?
The evolutionary trend in cephalization is that more advanced organisms have a larger concentration of neurons at one end of their body. ... Flatworms began to show cephalization, and arthropods (crustaceans, insects, and spiders), annelids (earthworms), and chordates (including humans) have all undergone cephalization.
Do bivalves feel pain?
In addition, as we will discuss, bivalves have the ability to close their shells to avoid sources of harm, and feeling pain (which requires sentience) could allow them to do so in appropriate circumstances.
Are bivalves vegan?
The same goes for bivalves (or sessile bivalves, at least). Bivalvegans believe that it's ethical to consume these aquatic animals because they cannot experience pain. Hence, one can consume bivalves and still remain vegan.
Do bivalves have eyes?
Many bivalves possess eyes along the ventral margin of their mantle, which lines the shell. These are called pallial eyes, in reference to a mantle or cloak (Gk.
What are characteristics of bivalves?
The bivalves are bilaterally symmetrical mollusks, enclosing the soft internal body. Common feeding characteristics of bivalves include filtering out particle food through an enlarged pair of gills known as ctenidia. Most bivalves are sedentary, but some use their foot to glide across substrate.
Do molluscs have tissue?
Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.
What type of reproduction do molluscs have?
Mollusks reproduce sexually, and most species have separate sexes. Sexual reproduction is achieved by the formation and fusion of gametes: sperm and eggs. Some species are hermaphrodites meaning that individuals are capable of forming both sperm and eggs.
