Phylogeny of Gastropoda:

1
Phylogeny of Gastropoda

• A Study of Orthogastropoda, Pulmonata, and
  Eogastropoda

Fig 1. Calliostoma annulatum (Kevin Lee 2009)
2
What are Gastropoda?

• The largest subclass of the molluscan class1
• Can be described as snails and slugs, but include
  over 150,000 species1
• Inhabit all continents, except Antarctica1
• Large subclasses include orthogastropoda,
  pulmonata, eogastropoda, and archaeogastropoda.2

Gary the Snail, (Nickelodeon)
Fig.2 Limax maximus (Greg St. Onge, 2004)
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Current Views of Phylogeny

• Based on morpological characters coding for 40
  taxa1
• All subclasses are widely considered monophyletic
  by morphological characters1,6
• Studies using molecular analysis have
  contradicted these findings3,4

Fig 3. This is fake
4
Methods of Classification

• Early methods utilized morphological
  characteristics1
• Recent studies have used molecular comparisons
  for classification, including1
• Mitochondrial DNA
• 18s rRNA
• Cytochrome c oxidase
• 28S rRNA

Fig. 4
5
Future Studies

• There are few studies on gastropoda phylogeny
  that utilize both morphological and molecular
  analysis
• Many contradicting results between morphology and
  molecular data
• There is lack of a strong phylogenetic framework3
• There are still many gastropoda genomes that have
  not been sequenced

Fig 5. Copulation of Alien Sluggish Snails
Parmarion martensi. (Masaki Hoso, 2007)
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Project Goals

• To study the phylogenetic relationships of the
  following
• Orthogastropoda- Pyramidella dolabrata, Ascobulla
  fragilis, Conus textile
• Pulmonata- Siphonaria pectinata, Onchidella
  celtica, Myosotella myosotis
• Eogastropoda- Lottia digitalis
• Use the tools of bioinformatics to meet above
  goals
• Solve the phylogenetic relationship?

Fig. 6 Escargot (Sue Yeap, 2008) This is real