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By David Paul Whistler, Xiaoming Wang, Lawrence G Barnes

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Extra resources for An updated classification of the recent crustacea

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G. Boxshall, pers. ). Ho (1994b) discussed cyclopoid phylogeny (based on cladistic analysis of the 10 families known at that time) and concluded that parasitism had arisen twice in the group. Papers describing new harpacticoid taxa (or elevating former subfamilies) include Huys (1990a, Adenopleurellidae; 1990b, Hamondiidae, Ambunguipedidae; 1990c, Cristacoxidae, Orthopsyllidae), Por (1986, Argestidae, Huntemanniidae, Paranannopidae [revised by Huys and Gee, 1996], Rhizothricidae [splitting the polyphyletic Cletodidae]), Fiers (1990, Cancrincolidae), Huys and Willems (1989, Laophontopsidae, Normanellidae; see also Huys and Lee, 1999), Huys and Iliffe (1998, Novocriniidae), Huys (1988, Rotundiclipeidae), Huys (1993, Styracothoracidae), and Huys (1997, Superornatiremidae).

In his subsequent critique of the Huys and Boxshall (1991) phylogeny, Ho (1994a) pointed out an alternative phylogeny where the Misophrioida was depicted as the sister group to the remaining seven orders of the Podoplea. For an in-depth review of recent attempts at producing copepod phylogenies, interested readers should consult Huys and Boxshall (1991) and the critique by Ho (1994a). , 1999) of relationships among the Poecilostomatoida, Calanoida, and Harpacticoida yielded somewhat different results, with the Poecilostomatoida depicted as basal to the calanoids and harpacticoids, in contrast with the abovementioned morphology-based hypotheses.

A review of various bodies of information con- Rationale cerning barnacle evolution (Schram and Høeg, 1995) reveals mostly that we still have much to learn about the relationships of the various groups of maxillopods. SUPERORDER ACROTHORACICA For this group, we have followed the classification of Newman (1996), where acrothoracicans are divided among two orders, Pygophora (with two families) and Apygophora (with a single family). SUPERORDER RHIZOCEPHALA Our classification of this group follows Høeg (1992), Høeg and Rybakov (1992), Høeg and Lu¨tzen (1993, 1996), Huys (1991), and Lu¨tzen and Takahashi (1996).

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