I only need a very short answers please Observation: Anatomy of a Crayfish Exter

Question

I only need a very short answers please



Observation: Anatomy of a Crayfish External Anatomy 1. In a preserved crayfish, identify the chitinous exoskeleton. With the help of Figure 17.12, identify the head, thorax, and abdomen. Together, the head and thorax are called the cephalothorax; the Figure 17.12 Anatomy of a crayfish. a. Drawing shows external anatomy. b. Internal anatomy of a female crayfish. (b) O Ken Taylor/Wildlife Images second walking leg third walking leg first walking leg (modified as a pincerlike claw) fourth walking leg fifth walking leg uropods swimmerets carapace compound antennae opening of claspers anus gills sperm duct telson Cephalothorax Abdomen ovary stomach compound eye antenna claw telson gills walking leg gland b. Laboratory 17 Invertebrates 227 17-15

Explanation / Answer

1. Yes. There are specific regions formed by the fusion of segments. Additionally, there are various segments with specialized appendages .

3. Yes. A distict head is observed, sometime it may be fused with thorax.

7. Yes. There are specialized appendages with various functions such as feeding, walking, swimming and reproduction.

Internal anatomy:

1. 2 rows of gills are present in crayfish. The outer row is attached to the bese of the walking legs.

11. Though the given specimen is most likely to have digestive stones, it really depends on the specimen.

The food the crayfish had been eating is also depends on the specimen.

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