What is unique about the madreporite of sea cucumbers (class Holothuroidea)?

Q: What is marine-exocoetus?

A: The superclass Pisces include the truly jawed vertebrates, which have organs of respiration and…

Q: What molluscan features can be seen in other invertebrate phyla? Explain.

A: Animals are classified on the basis of presence of spinal cord and backbone into vertebrates (…

Q: How is a hemocoel different from a true coelom?

A: Organisms with three primary germ layers are called triploblastic while the ones with only two…

Q: What features make placozoans interesting from a phylogenetic perspective?

A: The phylum Placozoa is a basal form of free-living multicellular organism. It consists of a small…

Q: How are freshwater oligochaetes generally different from earthworms?

A: All animals are classified according to their presence of characteristics such as characters,…

Q: What character unites members of clade Gnathifera?

A: There exist different types of organisms that are placed according to the characteristic features…

Q: What are the characteristics of protozoans that make them resemble animals?

A: Protozoa are unicellular eukaryotic organisms. They are classified in the Protista kingdom along…

Q: What is the scientific name of this organism? and how does it move? And which Phylum does it belong…

A: Phylum is the primary subdivision of a taxonomic kingdom, grouping together all classes of organisms…

Q: What evidence places roundworms in a clade with arthropods?

A: ROUNDWORMS It can be seen in an all-natural environment. It can be watched in the naked eye. Almost…

Q: What material is found in the skeleton of all sponges?

A: Sponges are members of the phylum Porifera. Sponges are a multicellular organism that has bodies…

Q: Where do Petromyzon and ammocoetes live?

A: Biodiversity is the diversity in living organisms that exists in a particular region or area. It…

Q: How do chaetognaths feed?

A: The word chaetognaths are derived from the Greek word chaite, long flowering hair, + gnathos, jaws.…

Q: Difference between pseudocelomates and acoelomates?

A: Coelom is the chief body cavity of animals. It is present inside the body to surround and contain…

Q: What are zoospores?

A: Motile spore that is asexual and uses its flagella for its locomotion is known as zoospores.Zoospore…

Q: What is the name of the larval stage of polychaetes?

A: Polychaetes are worm-like creatures that have an array of bristles on their many leg-like parapodia.…

Q: What is the type of digestion that occurs in cnidarians?

A: Cnidarians are a phylum which comes under the kingdom animalia.

Q: What features made it difficult for biologists to recognize echiurans and siboglinids as members of…

A: Annelid is the ancient and ecologically important animal phylum. The members form the dominant…

Q: What phylum is the closest relative of nemertines? Why?

A: Nemertines:  Nemertea, sometimes known as ribbon worms or proboscis worms, is a phylum of organisms.…

Q: What factors support the placement of phoronids and brachiopods as sister taxa?

A: The tree phyla-Phoronida, Ectoprocta, and Brachiopoda-possess a crown of ciliated tentacles, called…

Q: What characteristics do Hemichordata share with Echinodermata, and how do the two phyla differ?

A: Introduction  Hemichordate are referred to as Half chordates, they are marine deuterostomes animals.…

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: Which of the following is true about polychate worms (Feed using nematocysts/ part of the ecdysozoa/…

A: All animals are classified according to their presence of characteristics such as characters,…

Q: How are members of clade Clitellata distinguished from other annelids?

A: All the animal species on Earth are classified into different phyla or groups. They are classified…

Q: what is oldest invertebrate on earth planet?

A: Arthropoda is the largest phylum of the invertebrates, they contains insects molluscs etc.  Body of…

Q: How does the body plan of mesozoans relate to their parasitic behavior?

A: Phylum mesozoans include small worm like organisms which are parasite on marine inverteberates…

Q: Describe the process of respiration of Nile Tilapia and Acoelomate flatworms,

A: the process of respiration of Nile Tilapia and Acoelomate flatworms,are

Q: hat features of molluscs appear in other invertebrate phyla? Explain

A: The most common properties of mollusks are covers with various vital openings used for breathing and…

Q: What characteristics distinguish Branchiopoda, Ostracoda, Copepoda, Thecostraca, and Malacostraca?

A: The phylum Arthropoda has ten sub-classes namely, a) Euchelicerata b) Chilopoda c) Diplopoda d)…

Q: Are ceriantipatherians also known as horny corrals?

A: Cnidarians are the animals which belongs to the phylum cnidarian which under the kingdom animalia…

Q: What are two features that put the octopus in the phylum Mollusca?

A: Mollusks are defined as a large group of invertebrates. They generally have soft body, also the…

Q: What is the function of the feet in molluscs? How is the mollusc foot related to the name given to…

A: Phylum Mollusca is the second largest animal phylum which includes over 60,000 species. Molluscs…

Q: Why do some biologists think that the apicomplexans descended from dinoflagellates?

A: The finding of a nonphotosynthetic plastid in malaria and other apicomplexan pathogens has prompted…

Q: Which other invertebrate groups are likely to be the closest relatives of molluscs? What evidence…

A: Invertebrate groups: Invertebrate groups are the group of organisms that does not have a vertebral…

Q: How is the biology of onychophorans related to their distribution?

A: Onychophora , commonly known as velvet worms. They are terrestrial invertebrates.

Q: What features distinguish the amoebozoa from the rhizarians?

A: Protists are the unicellular organisms that are eukaryotes.

Q: How is the biology of onychophorans related to their distribution?

A: Comparative anatomy is the study of the "similarities and dissimilarities" between various objects.…

Q: Echinodermata / star fish On which surface would you find the mouth?

A: Echinoderms are the invertebrate chordates included under the largest clade characterized by…

Q: What appendages characterize chelicerates?

A: Consisting around 9 lakh species, Arthropoda is the biggest phylum in anima kingdom. Common examples…

Q: PLATYHELMINTHES NEMATODA body cavity     germ layers     symmetry     monoecious or…

A: Platyhelminthes which are also known as the flat worms are unsegmented and are bilaterally…

Q: What habitat is shared by micrognathozoans and gnathostomulids?

A: Members of two of the bilaterally symmetrical triploblastic phyla have acoelomate bodies. A coelom…

Q: What is the cleavage pattern of Cnidarians?

A: Cnidarian, is also known as coelenterate is a member of the phylum Cnidaria (Coelenterata), These…

Q: Sea urchins have radial symmetry. Explain why they are not classified as Radiata along with the…

A: Introduction  There is alot of animal diversity present on earth. There are many simpler forms…

Q: What is the reason for saying that sponges are closely related to, and probably evolved from,…

A: Sponges, which belong to the phylum Porifera, are a sister group to the Diploblasts and are a…

Q: Which other invertebrate groups are likely to be the closest relatives of molluscs? What evidence…

A: Mollusca is the largest marine phylum of the animal kingdom that is characterized by a mantle with a…

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

A: Ctenidium is a comb-like structure with an axis consisting of rows of projecting filaments. It is a…

Q: Leeches are members of the phylum _ in the clade of bilaterally symmetric animals called _…

A: Leeches are ectoparasites and do not possess any parapodia or setae. They have a peculiar connective…

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: What characteristics of Mollusca distinguish it from other phyla?

A: Invertebrates are animals that do not have a backbone. They range from small microscopic mites to…

Q: What is a trilobite?

A: Introduction Trilobites as name suggest their body is consisted of three lobes and three segmenting…

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.