General Zoology – Biology 2154

Lab 29 – Molluscs, Annelids, and Arthropods

Questions to answer in lab manual:

  • Any associated with below activities unless noted
  • Laboratory Review #1 – 7, 9 – 12, 15 - 17

Activities to complete:

  • 29.1 Phylum Mollusca (Molluscs)
  • Observation: Diversity of Molluscs
  • Table 29.1 Molluscan Diversity (record in notebook)
  • Observation: Anatomy of Clam
  • Internal Anatomy #1 – 5, and 7 – 15
  • Observation: Anatomy of Squid #1 – 4
  • With the fins facing down, cut the squid’s mantle cavity along the long axis of the body using scissors. Pin the flaps down to expose the visceral (inner) organs. Identify the structures listed under the squid drawing below.
  • Table 29.2 Comparison of Clam and Squid (record in notebook)
  • 29.2 Phylum Annelida (Annelids)
  • Observation: Diversity of Annelids
  • Table 29.3 Annelid Diversity (record in notebook)
  • Observation: Anatomy of Earthworm
  • Internal Anatomy #1 -12
  • Table 29.4 Comparison of Clam with Earthworm (record in notebook)
  • 29.3 Phylum Arthropoda (Arthropods)
  • Observation: Diversity of Arthropods
  • Table 29.5 Arthropod Diversity (record in notebook)
  • Observation: Anatomy of Crayfish
  • External Anatomy #1 – 10
  • Internal Anatomy #1 – 11
  • Observation: Anatomy of Grasshopper
  • External Anatomy #1 - 4, and 6 – 8
  • Internal Anatomy #1 – 11
  • Table 29.6 Comparison of Crayfish and Grasshopper
  • Conclusions #1 – 4

Drawings and associated structures to include in the notebook (based on YOUR dissections/slides and not the book’s):

  • Clam
  • Umbo, mantle, adductor muscles, incurrent and excurrent siphons, gills, foot, visceral mass, labial palps, intestine, and pericardial sac
  • Squid
  • Tentacles, arms, mouth, radula, eye, funnel, pen, gonads, ink sac, and gills
  • Earthworm
  • Mouth, anus, clitellum, esophagus, crop/gizzard area, intestine, dorsal blood vessel, ventral solid nerve cord, nephridia, seminal vesicles, seminal receptacles, brain and hearts
  • Crayfish (be able to distinguish male and female)
  • Cephalothorax, abdomen, carapace, antennae, compound eye, swimmerets, seminal receptacles, uropods, gills (podobranchia and arthrobranchia), gonads, mouth, esophagus, stomach, gastric mill, green glands, and brain
  • Grasshopper (be able to distinguish male and female)
  • Head, thorax, abdomen, forewings, hindwings, compound eye, simple eye, antennae, tympanum, spiracles, ovipositor/clasper, trachea, nerve cord, and brain

The following should have also been included in your notebook from the above activities:

  • Table 29.1 Molluscan Diversity
  • Table 29.2 Comparison of Clam and Squid
  • Table 29.3 Annelid Diversity
  • Table 29.4 Comparison of Clam with Earthworm
  • Table 29.5 Arthropod Diversity
  • Table 29.6 Comparison of Crayfish and Grasshopper