Document Detail

Phylogeny of the orders of the Eucestoda (Cercomeromorphae) based on comparative morphology: historical perspectives and a new working hypothesis.
MedLine Citation:
PMID:  9406791     Owner:  NLM     Status:  MEDLINE    
The phylogeny of the Eucestoda was evaluated based on a suite of 49 binary and multistate characters derived from comparative morphological and ontogenetic studies; attributes of adult and larval tapeworms were considered. A single most parsimonious tree (MPT) (consistency index = 0.872; retention index = 0.838; and homoplasy index = 0.527) was fully resolved and is specified by the following: (Gyrocotylidea, (Amphilinidea, ((Spathebothriidea, (Pseudophyllidea, ((Diphyllidea, (Trypanorhyncha, (Tetraphyllidea, (Lecanicephalidea, ((Nippotaeniidea, (Tetrabothriidea, Cyclophyllidea)), Proteocephalidea))))), Haplobothriidea))), Caryophyllidea))). Monophyly for the Eucestoda was firmly corroborated. Trees derived from the primary and bootstrap analyses were congruent, but low values, particularly for relationships among the tetrafossate tapeworms, indicated additional examination is warranted. The MPT was found to be the most efficient hypothesis for describing character evolution and in specifying relationships among the orders when compared to those concepts that had been developed for the tapeworms over the past century. Areas of congruence were shared among the current hypothesis and one or more of the prior hypotheses. Major conclusions include: (1) Caryophyllidea are basal and monozooy is ancestral; (2) difossate forms are primitive, and the Pseudophyllidea are the sister group of the strongly polyzoic tapeworms; (3) Nippotaeniidea are highly derived; (4) the higher tapeworms (Tetraphyllidea, Lecanicephalidea, Proteocephalidea, Nippotaeniidea, Tetrabothriidea, and Cyclophyllidea) are closely related or potentially coordinate groups: (5) Tetrabothriidea and the Cyclophyllidea are sister groups; and (6) Tetraphyllidea is paraphyletic, with the Onchobothriidae basal to the Phyllobothriidae. Character support for placement of the Tetrabothriidea continues to be contradictory, and this order may represent a key to understanding the phylogeny of the higher cestodes. The current study constitutes a complete historical review and poses a new and robust hypothesis for the phylogeny of the Eucestoda.
E P Hoberg; J Mariaux; J L Justine; D R Brooks; P J Weekes
Publication Detail:
Type:  Comparative Study; Historical Article; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Review    
Journal Detail:
Title:  The Journal of parasitology     Volume:  83     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-01-06     Completed Date:  1998-01-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1128-47     Citation Subset:  IM; Q    
United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland 20705, USA.
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MeSH Terms
Cestoda / anatomy & histology*,  classification*,  growth & development
History, 19th Century
History, 20th Century
Larva / anatomy & histology
Muscles / anatomy & histology
Ovary / anatomy & histology
Ovum / cytology,  growth & development
Parasitology / history*
Spermatozoa / cytology
Testis / anatomy & histology
Uterus / anatomy & histology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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