Which type of gills do Gripopterygidae stoneflies possess?

Which type of gills do Gripopterygidae stoneflies possess?

• A. Lateral thoracic gills.
• B. Anal gills.
• C. Abdominal gills.
• D. Branchial tufts on the abdomen.

Answer: (B)

Understanding where gills are located on stonefly nymphs helps identify their family and reveals how they breathe in fast-flowing streams. In Gripopterygidae, the gills are anal gills, meaning the filamentous gill structures are positioned around the posterior end of the abdomen near the anus. This tail-end gill arrangement is a distinctive feature that suits their habitat in cool, swiftly flowing waters, where accessing dissolved oxygen can be challenging and rhythmic flow helps keep the gills clear of sediment. Lateral thoracic gills would be on the sides of the thorax, a placement seen in other groups rather than Gripopterygidae. Abdominal gills placed along the abdomen, rather than specifically at the rear, and branchial tufts scattered along the abdomen describe other potential configurations but do not match the characteristic anal-gill arrangement of this family.

Understanding where gills are located on stonefly nymphs helps identify their family and reveals how they breathe in fast-flowing streams. In Gripopterygidae, the gills are anal gills, meaning the filamentous gill structures are positioned around the posterior end of the abdomen near the anus. This tail-end gill arrangement is a distinctive feature that suits their habitat in cool, swiftly flowing waters, where accessing dissolved oxygen can be challenging and rhythmic flow helps keep the gills clear of sediment.

Lateral thoracic gills would be on the sides of the thorax, a placement seen in other groups rather than Gripopterygidae. Abdominal gills placed along the abdomen, rather than specifically at the rear, and branchial tufts scattered along the abdomen describe other potential configurations but do not match the characteristic anal-gill arrangement of this family.