Cyprid Ultrastructure and Adult Morphology in Ptychascus barnwelli, New Species, and P. glaber (Cirripedia: Rhizocephala), Parasites on Semiterrestrial Crabs

Andersen, Mogens L.; Bohn, M.P.; Høeg, Jens T.; Jensen, Peter Gram

doi:10.2307/1548666

Cited by 19 publications

(16 citation statements)

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“…Virgin Lernaeodiscus porcellanae can successfully attract males as long as six months after emergence, but in most species the externa will have perished much sooner (Liitzen, 1984;Heeg & Ritchie, 1985). With the exception of Clistosaccus, all Akentrogonida will apparently continue development whether they receive males or not, and will eventually spawn unfertilized, aborted eggs (Liitzen, 1981;Heeg, 1982;Heeg et al, 1990;Heeg & Liitzen, 1995). This trait cannot confer any selective advantage, but may reflect that akentrogonids grow so slowly that the externae usually succeed in getting males in time.…”

Section: Maturation To the Adultmentioning

confidence: 99%

“…However, rhizocephalan taxonomy relies heavily on very crude morphological characters. Therefore some of these cases may well represent sibling species, which can be separated only by chromosome numbers (Fratello, 1966(Fratello, ,1967(Fratello, ,1968, larval ultrastructure (Andersen et al, 1990), or perhaps isoenzymes. It seems that host specificity does not rest with the cyprid, since they settle and metamorphose on crab species that do not normally carry externae in the field (Ritchie & Heeg, 1981;Rubiliani, 1984;Hoeg & Liitzen, 1995).…”

Section: Host Specificitymentioning

confidence: 99%

“…The Thompsoniidae may exemplify this, since they parasitize not only a wide range of Decapoda but also the Stomatopoda (H0eg & Liitzen, 1993). Likewise, species of the Chthamalophilidae occur on both Chthamalidae and the distantly related Balanidae (Heeg et al, 1990). Sometimes the parasite seems to have followed the host through an evolutionary specialization.…”

Section: Host Specificitymentioning

confidence: 99%

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The biology and life cycle of the Rhizocephala (Cirripedia)

1995

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This review describes aspects of the life cycle and ecology of the Rhizocephala emphasizing (i) comparison with more conventional Cirripedia, and (ii) evolutionary and phylogenetic perspectives. Despite numerous extreme specializations to living as parasites in other Crustacea, most features of the rhizocephalan life cycle resemble those seen in other Cirripedia, and only the process of host invasion and the ensuing redifferentiation of the adult parasite represent truly unique features. Larval biology of the Rhizocephala has developed under selection pressures induced by the difficulty of locating the substratum for settlement, host defences against parasite invasion, and the special demands imposed on the sexual system of a parasite. Thus rhizocephalans have (i) lecithotrophy coupled with very small-sized larvae, (ii) special sensory organs in the cyprid, (iii) a very rapid host invasion accomplished by minute, female stages, and (iv) dwarf males nourished by the adult female parasite, such that it emulates a true hermaphrodite. This review also surveys the nature and underlying causes of the numerous effects that rhizocephalan parasites can induce on their hosts in terms of morphology, physiology, and behaviour. The 'host control' induced by rhizocephalans ensures that both male and female hosts accept the parasite as their own brood and care for it accordingly. This, and other details of host-parasite co-evolutions are discussed.

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Section: Maturation To the Adultmentioning

confidence: 99%

Section: Host Specificitymentioning

confidence: 99%

Section: Host Specificitymentioning

confidence: 99%

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The biology and life cycle of the Rhizocephala (Cirripedia)

1995

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“…Andersen et al (1990) report that their larvae are released as cyprids, the male cyprids at least being competent to settle immediately on release, an adaptive trait to the infrequent encounters of their respective hosts with water. Such an abbreviated larval phase has only been found so far for one marine kentrogonid-Cyphosaccus chacei-parasitic on various galatheids (Reinhard, 1958).…”

Section: Kentrogonidamentioning

confidence: 99%

“…Rhizocephalans in/on their respective hosts are widely distributed. They can be found in the deep ocean (Lü tzen, 1985;Rybakov and Høeg, 1992), on continental shelves, in the littoral zone, and even infesting certain semiterrestrial and freshwater crabs (see Andersen et al, 1990).…”

mentioning

confidence: 99%

A note from the editor

Harrison¹

2001

Journal of Morphology

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Introduction to the Rhizocephala (Crustacea: Cirripedia)

Walker

2001

Journal of Morphology

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Knowledge about the Rhizocephala (parasitic barnacles) has increased exponentially over the past two decades. This introduction broadly reviews this progress, touching on rhizocephalan morphology, life-cycles, larval biology, and the effects on the crustacean hosts. Members representing both orders, the Kentrogonida and Akentrogonida, are discussed. The recent discovery regarding the vermigon stage further highlights the intricacy of the kentrogonid life-cycle. Because rhizocephalans are found in most world regions, occurring on their respective hosts from the deep ocean to freshwater, their importance is now being recognized.

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Cyprid Ultrastructure and Adult Morphology in Ptychascus barnwelli, New Species, and P. glaber (Cirripedia: Rhizocephala), Parasites on Semiterrestrial Crabs

Cited by 19 publications

References 0 publications

The biology and life cycle of the Rhizocephala (Cirripedia)

The biology and life cycle of the Rhizocephala (Cirripedia)

A note from the editor

Introduction to the Rhizocephala (Crustacea: Cirripedia)

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