Which combination describes Hydrophilidae?

Which combination describes Hydrophilidae?

• A. Maxillary palps short and slender; Antennae short and clubbed.
• B. Maxillary palps long and slender; Antennae short and clubbed.
• C. Maxillary palps short and thick; Antennae short and clubbed.
• D. Maxillary palps long and slender; Antennae short and clubbed.

Answer: (D)

Hydrophilidae can be recognized by their mouthparts and antennae arrangement: the maxillary palps are long and slender, extending forward, while the antennae are short and end in a distinct club. This combination is a classic diagnostic feature for water scavenger beetles and helps distinguish them from other aquatic beetle families that may have shorter or thicker palps or antennae that aren’t clubbed. So the described match—long and slender maxillary palps with short, clubbed antennae—best identifies Hydrophilidae.

Hydrophilidae can be recognized by their mouthparts and antennae arrangement: the maxillary palps are long and slender, extending forward, while the antennae are short and end in a distinct club. This combination is a classic diagnostic feature for water scavenger beetles and helps distinguish them from other aquatic beetle families that may have shorter or thicker palps or antennae that aren’t clubbed. So the described match—long and slender maxillary palps with short, clubbed antennae—best identifies Hydrophilidae.