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Difficulty: HardExcretion and Excretory Organs

Match each specialized excretory structure listed on the left with its corresponding taxonomic group on the right.

  • SolenocytesCephalochordata
  • Antennal (green) glandsCrustacea
  • MetanephridiaAnnelida
  • Coxal glandsArachnida

Answer

Solenocytes correspond to Cephalochordata, Antennal glands correspond to Crustacea, Metanephridia correspond to Annelida, and Coxal glands correspond to Arachnida.
Solenocytes are flagellated excretory units characteristic of Cephalochordata. Antennal glands serve as osmoregulatory organs at the base of crustacean antennae. Metanephridia are coelomic excretory tubes found segmentally in Annelida. Coxal glands release waste at the leg bases of Arachnida.

Step-by-Step Solution

1
Identify the structural characteristics of solenocytes
Solenocytes feature long flagella enclosed within tubular cells used for ultrafiltration in Cephalochordates.
Matching structural specialization to taxonomic lineage.
2
Locate the anatomical position of antennal glands
Antennal (green) glands function at the base of antennae in aquatic arthropods (Crustacea).
Differentiating arthropod excretory adaptations based on body plan.
3
Distinguish metanephridial tubule organization
Metanephridia utilize a ciliated nephrostome drawing coelomic fluid into excretory ducts in segmentally arranged Annelids.
Distinguishing true metanephridia from protonephridia.
4
Relate coxal glands to leg segment placement
Coxal glands filter waste directly at the basal leg segment (coxa) in chelicerates (Arachnida).
Linking excretory gland anatomical position to arachnid morphology.

Key Concept

Comparative Invertebrate Excretory Structures and Evolutionary Lineages
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Topics

Excretion and Excretory Organs

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