How is the ctenidium modified from the ancestral form in a typical bivalve?

Q: What is the phylum of scoliodon?

A: Introduction  Scoliodons are commonly called as Shark or Dogfish. They come under kingdom animalia.…

Q: Explain in detail the external characters of Scoliodon?

A: Class Chondricthyes includes the cartilaginous fishes. The fishes bear endoskeleton made up of…

Q: What are the phylogenetic relationships among and within each phyla (Mollusca, Annelida, and…

A: Phylum Mollusca, Annelida and Platyhelminthes belong to the kingdom Animalia. Mollusca are second…

Q: What invertebrate groups exhibit hydrostatic skeletons? What is the importance of the hydrostatic…

A: Invertebrates are those which do not have vertebral column.

Q: What is the main evolutionary innovation presented by nematodes? What is the advantage of that…

A: Nematodes are bilaterally symmetrical, elongated organisms which play a vital ecological roles as…

Q: How are the 4 chordate synapomorphies evident in a tunicate larva and in an adult tunicate?

A: Although tunicates are classified as chordates, only the larval form possesses all four common…

Q: What features of Lumbricus indicate that it is an annelid?

A: The phylum Annelida consists of worms like the ring worms, earthworms and segmented worms. They have…

Q: Explain the interaction of cuticle, body-wall muscles, and pseudocoelomic fluid in locomotion of…

A: Most Nematodes move side to side or laterally by contraction of the longitudinal muscles because all…

Q: What is the life history and development of the phylums Mollusca, Annelida, and Platyhelminthes?

A: Phylum Mollusca, Annelida and Platyhelminthes belong to the kingdom Animalia. Mollusca are second…

Q: Why do parasites like trematodes produce such large quantities of eggs?

A: The trematode reproduces asexually inside this mollusk host, creating numerous copies of a second…

Q: What are the criteria that delimit this phylum echinodermata to its classes? What are the striking…

A: Hi. Since you have asked multiple questions. We are answering the first one for you. Please…

Q: Are acoelomate flatworms basal bilaterians?

A: While classifying the animals based on their internal structures and external features, the presence…

Q: Why is bilateral symmetry of adaptive value for actively motile animals?

A: Bilateral symmetry is a pattern of symmetry where the opposite sides are normal or one side is…

Q: What is tape worm and its structure?

A: Worms can be divided into several groups, but are still technically decomposers. The first of these,…

Q: What is trophallaxis? What function(s) does it serve in termites?

A: Behavior is whatever thing an animal does relating action and/or a reaction to a stimulus. Walking,…

Q: What are the genes and proteins involved in the formation of axes in nematodes?

A: Any worm of the phylum Nematoda is known as Nematodes. They are commonly known as roundworms. They…

Q: Write 3 adaptations of Scoliodon

A: Scoliodon is also called as the dogfish.it belongs to the class cartilaginous fishes

Q: Explain how the high pseudocoelomic pressure affects feeding and defecation in nematodes.

A: The pseudocoelom is a fluid-filled body cavity that is situated inside the external body wall of the…

Q: What is the morphological feature of molluscs after which the phylum is named?

A: The Animal Kingdom is one of the largest kingdoms of organisms on Earth. They comprise of organisms…

Q: What are the functional significance of differences in shell morphology among gastropods and…

A: The shell is basically an exoskeleton.It can protect from predators,mechanical damage and…

Q: What are the morphological similarities and differences between nematodes and annelids?

A: Nematodes are referred as roundworms and constitute phylum Nematoda. They are multicellular…

Q: What is the difference between Labeo and Scoliodon?

A: Fishes are gill bearing aquatic animals that belong to the kingdom Pisces and phylum chordates. They…

Q: What is the typical morphological feature of nematodes that differentiates them from…

A: Nematodes are also known as roundworms and they are not closely related with the true worms. They…

Q: How are the anatomy and visual appearance different between amphioxus and  Ammocoete Larvae ?

A: Amphioxus belongs to Cephalochordata while ammocoete is a larva of Lamprey. Ammocoete larva and…

Q: What are some advantages of freshwater clams producing parasitic larvae that attach to the gills of…

A: Glochidia, parasitic larvae of freshwater clams, attach themselves to the gills and skin of fish.

Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.