Fig. 1. Multiple alignment and phenogram of initial 707-nucleotide amplification product of Na⁺/K⁺-ATPase -subunit from Pachygrapsus marmoratus (accession no. AF375957) with corresponding partial cDNA sequences from four other arthropods: blue crab Callinectes sapidus (acc. no. AF327439), American lobster Homarus americanus (acc. no. AY140650), mosquito Anopheles gambiae (acc. no. XM_563283), and honey bee Apis mellifera (acc. no. XM_392363). The alignment (A) and phenogram (B) were both generated using the Hein algorithm (Hein, 1990) in the MegAlign component of DNASTAR software and configured with GeneDoc (Nicholas and Nicholas, 1997). The blue background indicates 100% agreement between all five sequences, green 80%, and yellow 60%. Bootstrap values at each node of the phenogram=100.