Animals Bio

have chordate larval forms, which metamorphose into sessile, filter-feeding adults that bear little resemblance to other chordates.

Tunicates

In deuterostomes, the blastopore gives rise to the

anus

Which phylum below needs to molt in order to grow, a process known as ecdysis?

arthropoda

In echinoderms, the larvae are ______ symmetrical, and the adults are __________ symmetrical

bilaterally, pentaradially

The flagellated cells that line the internal cavity of a sponge and help water flow through the ostia are known as

choanocytes

Which phylum below has individuals that are found in a polyp or medusa stage?

cnidaria

As their name implies, flatworms in the phylum Acoela lack

coeloms

Comb jellies make up the phylum

ctenophora

Based on ample evidence, the echinoderms and chordates form a monophyletic clade called the

deuterosomes

what phylum is closely related to chordata

echinodermata

Name the thick epidermal sheet covering the dorsal side of a mollusk's body:

mantle

Which phylum is a member of Lophotrochozoa?

mollusca

Squid, octopuses, chitons, snails, clams, and oysters are all members of the phylum

mollusks

Which phylum below has an acoelom?

platyhelminths

Annelid segments are divided from one another internally by

septa

Which phylum below does NOT have a true coelom?

Annelida

Segmented organisms with jointed legs and a hard exoskeleton composed of chitin belong to the phylum

Arthropoda

What are the flagellated cells that line the internal cavity of a sponge and help water flow through the ostia called?

Choanocytes

are characterized by a dorsal, hollow nerve cord, a notochord, pharyngeal gill slits, and a postanal tail.

Chordata

Which phyla can produce twins?

Chordata and Echinodermata

Within phylum Cnidaria, the class that includes the most species is

Eumetazoa

Insects and some other animals, such as the soil-dwelling Collembola belong to the class

Hexapoda

Protosteoms can be divided into two clades;

Lophotrochozoa and Ecdysozoa

Unsegmented worms that are round in cross section, have longitudinal muscles, and are covered by a flexible, thick cuticle that is molted as they grow, belong to the phylum

Nematoda

Which phylum below does NOT have segmentation?

Nematoda

Which phylum below has a pseduocoelom?

Nematoda

Ribbon worms are members of the phylum

Nemertea

Which phylum of animals has choanocytes that contribute to our own understanding of the colonial flagellate hypothesis?

Porifera