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