ACTIVITY 10:
ANIMAL DIVERSITY
A. Phylum Porifera
TABLE 1
ILLUSTRATED SPONGES CLASS
Leucosolenia Class Calcispongiae
Grantia Class Calcarea
Euplectella aspergillum Hexactinellid
Spongilia Demosponge
Euspongia Officinalis Demosponge
Leiodermatium Demospongiae
Questions:
1. What are the spicules of sponges for?
Spicules functions is to support, and microscleres, which function is to protect and also aid support.
2. How are sponges classified?
There are three classes within the phylum porifera: Calcerea, Desmospongia, and Hexactinellida.
Sponges are divided into these classes based primarily on the composition of their spicules and skeletal
fibers.
3. Why are sponges considered as the simplest form of animal?
Sponges is considered as the simplest form of animal because their bodies are not organized in organs,
system or even tissues instead, sponges are made group of cells that work together to meet the the
daily needs of the sponges.
B. Phylum Cnidaria
TABLE 2
Illustrated Cnidarian CLASS
Hydra Class Hydrozoa
Obelia Class Hydrozoa
Nepthya Class Cubozoa
Acrometoides Class scyphozoan
Isis Class Anthozoa
Metridium Sea anemones and corals
QUESTIONS:
1. What benefits do cnidarians get from the possession of the germ layer?
Germ layers develop during gastrulation. In cnidarians, the endoderm will form the internal tissues and
structures such as the gastrodermis and gastrovascular cavity called the coelenteron. This is where
many important processes occur for the animal, such as digestion and gas and nutrient exchange.
