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chapter excerpt from the author’s doctoral thesis (Zhu, 2005). However the author plans to update the online version frequently to incorporate the latest development in the field. Please obtain the latest version at http://www.cs.wisc.edu/~jerryzhu/pub/ssl_survey.pdf

The online version of this article, along with updated information and services, is located on the

Comparative analysis of molecular sequence data is essential for reconstructing the evolutionary histories of species and inferring the nature and extent of selective forces shaping the evolution of genes and species. Here, we announce the release of Molecular Evolutionary Genetics Analysis version

An on-line algorithm is presented for constructing the suffix tree for a given string in time linear in the length of the string. The new algorithm has the desirable property of processing the string symbol by symbol from left to right. It has always the suffix tree for the scanned part

PHASE, version 2.0, available online (http://www.stat.washington.edu/stephens/ software.html). Current high-throughput genotyping technologies, when applied to DNA from a diploid individual, are able to determine which two alleles are present at each locus but not the haplotype information (that is

exhibits all of the hallmarks of a relictual group that was once diverse and widespread,  but is today represented by a small  number  of  refugial  species whose  host  associa-tions and geographical distribution  show  little  common-ality. Multiple lines of evidence suggest that the group is indeed ancient and potentially represents the earliest branch of true tapeworms (i.e. Eucestoda)  among extant forms. Morphologically, they share features of both the eucestodes (including a hexacanth embryonic stage and the serial  repetition of  the  reproductive organs)  and  the ‘cestodarian ’  sister  group Amphilinidea  (in  their  utilisa-tion of amphipod intermediate hosts,  lack of external seg-mentation and a scolex lacking either bothrial or acetabu-late holdfast structures). Molecular phylogenetic analyses have also provided independent support for a basal position of the group

The Zoogonidae Odhner, 1902 is a family containing parasites of teleosts and occasionally elasmobranchs (Bray 1986, 1987, 2008). The asexual stages use gastropods as first intermediate hosts and a wide range of invertebrates as second intermediate hosts, frequently polychaetes and echinoderms, but also gastropods (Bray 1986, Jangoux 1987). Known cercariae of this family typically have the form of a cercariaeum (tail-less). Madhavi and Shameem (1991) published a list of reported zoogonid cercariae and their hosts when they described Cercaria chilkaensis II Madhavi et Shameem, 1991 from Nassarius orissaensis (Preston) in India. The taxonomic history of zoogonid cercariae is confused; there are currently many synony-mous names recognised and there have been numerous revisions of descriptions. All zoogonid cercariae reported to date, with the exception of Cercaria crispata Pelseneer,

site Collection (NPC), a cornerstone of global and North Ameri-can parasitology, has been maintained by scientists and curators