Ex.08--AnimaliaI_1

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Feb 20, 2024

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8-7 Bio. 101B--Ex. 8 Worksheet: Porifera and Cnidaria Name:_________________________ Lab Section:(am/pm/eve)__________ Part A-- Porifera (Sponges) 1. Prepared slides of Scypha sp.—cs of body. NOTE: DRAW the specimen on the slide, NOT the picture in the Photo Atlas. Left Scypha thick x-sect. (40x): Label: Spongocoel, Incurrent canal, radial canal, ostium. Right: (1000x) zoom in on a radial canal, label choanocytes. 40x 1000x 2. Prepared slide--Scypha spicule strew (400x). Label spicule. 3. Examine other preserved sponges available in the lab. You do not need to sketch them. Photo Atlas Figure 7.6 Radial canal Ostium Incurrent canal Choanocytes Spongocoel Spicule Aushu Sharma Omar Youssef pu - [ 0 [
8-8 Part B-1 Cnidaria; Hydrozoa -- Hydra observations of living specimen 1. Observe a live Hydra specimen (if available) with the dissecting microscope: Use 7.14-15 (Atlas) to identify the following structures (check): ____tentacles ____bud (if present) ____basal disc ____ mouth. 2. Describe the behavior(s) observed in Hydra. 3. Prepared slides of Hydra. Left. Whole mount--draw (in left box) close up view of tentacles at 1000x, label tentacle, cnidocyte, nematocyst (if visible). Right: Prepared slide cross-section (c.s.)—label epidermis, mesoglea, gastrodermis, gastrovascular cavity (draw a portion of body wall at 400x). Photo Atlas Figure 7.16 to 7.18 ~ w ~
8-9 Part B-2 Cnidaria; Hydrozoa -- Obelia Left Drawing Prepared slide of hydroid colony. Label Tentacles, medusal buds, gonangium. Right: Drawing. Prepared slide of medusa. Label Tentacles, radial canals, mouth. A. Mag:_________ B. Mag:_____ 2. Examine some of the other hydrozoan specimens on display on the back bench. You do not need to sketch them. Part B-3 Cnidaria; Scyphozoa -- Aurelia sp. Preserved specimen. 1. Examine a preserved specimen of the sea jelly Aurelia . Locate on the specimen the following (use Fig 7.31 and 7.32, Atlas): ------ marginal tentacles, ------ gastric pouch, ------ gonad ____ radial canals Part B-4 Cnidaria; Anthozoa -- Metridium sp. 1. Observe a preserved sea anemone specimen--identify as many of the structures mentioned on page 8.6 (Figure 1) as possible. Photo Atlas 7.23-7.25 Oral disk Tentacles ⊥ Ox 100X W W - ~ S
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8-10 2. Cross-section of Metridium sp. Prepared Slide. Draw just a section of the body wall and label epidermis, gastrodermis, mesoglea, primary septum, secondary septum and retractor muscle. (Fig. 7.43 Photo Atlas and Fig. 1 prelab notes) Mag. _____ 3. Observe a couple of coral specimens available in lab. 4. List some differences between anemones and corals:

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