• Systematics of the neomenioid families Dondersiidae (Schander), Simrothiellidae (Arnofsky), and Pruvotinidae (Okusu) 
• World distribution of the Prochaetodermatidae (Ivanov & Scheltema)
• Relationships among the families of Chaetodermomorpha (Caudofoveata) (Scheltema & Ivanov)
• Relationship of Aplacophora to Cambrian mollusk-like fossils (Scheltema, Ivanov & Schander)
• Hydrothermal vent neomenioids (Scheltema)
• Neomenioids of Sea Mounts (Scheltema)
• Phylogeny of the Neomeniomorpha (Solenogastres) including morphology and molecular characters (Schander, Scheltema, Okusu, Arnofsky)
• Embryology (Okusu)
• Determination of relationship of Chaetodermomorpha, Neomeniomorpha, and Polyplacophora (Schander, Scheltema, Okusu)

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