You'll get the best results if you search for articles in a subject database that focuses on your topic.
Two good databases for finding journal articles on invertebrate physiology: BIOSIS Previews or Biological & Agricultural Index Plus.
Search using the common or genus name and additional keywords like anatomy, anatomical, life history, life cycle, taxonomy, morphology, physiology, or reproduction.
Image source: Al2. Helix aspersa. GFDL. Wikimedia Commons.
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