Evidence for shedding of maxillary jaws in eunicoid polychaetes

Colbath, G. Kent

doi:10.1080/00222938700771111

Cited by 18 publications

(20 citation statements)

References 5 publications

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“…Stomodaeum with a ventrally muscularized and eversible pharynx; jaws a pair of mandibles and four pairs of maxillae in labidognath arrangement. Calcification of jaws with calcite (Colbath 1987). Guiar membrane absent; gut a straight tube.…”

Section: Lumbrineridae Schmarda 1861mentioning

confidence: 99%

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Polychaete systematics: Past and present

1997

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In this paper, we first demonstrate the historical background for the current unsatisfactory state of systematics of the polychaetes. We then briefly discuss our knowledge of internal and external structures. A review of the polychaete families makes up the third section; 81 families are treated in detail. Five families have been recently synonymized with others, and six families are too poorly known to be sufficiently characterized. Fossil polychaetes are briefly mentioned, with specific attention to problems associated with incorporating them in recent systematics.The traditional separation in 'errant' and 'sedentary' polychaetes has increasingly become recognized as being unsatisfactory; however, the current trend towards grouping the polychaetes in many orders without specifying the relationships among the orders, is no more satisfactory. The lack of consistent morphological information is a major source of uncertainty. Intensive morphological studies should remove terminological ambiguities and alleviate some of the problems.

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Section: Lumbrineridae Schmarda 1861mentioning

confidence: 99%

“…The number of maxillae varies even within individual species {Arabella mutans, Colbath 1987) and between genera. The large-bodied genera {Oenone, Halla, Arabella) usually have five or more maxillae on each side; the small-bodied ones {Drilonereis) tend to have a smaller number of maxillae, often two per side (pers.…”

Section: Nerillidae Levinsen 1883mentioning

confidence: 99%

Polychaete systematics: Past and present

1997

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“…This total lack of evidence and the apparent addition of new teeth to the distal parts of maxillae led me to propose that maxillae grow throughout the life of the worm (Paxton, 1980). This hypothesis has been contradicted by Colbath (1987) who showed that the internal maxillary jaws are inconsistent with continuous maxillary growth. In his study of paulinitid scolecodonts from Gotland, Bergman (1989) discussed moulting of jaws and came to the conclusion that 'it is reasonable to assume that the jaws of many Lower Palaeozoic eunicids were shed and replaced during growth.…”

Section: Introductionmentioning

confidence: 91%

“…Two incompletely developed maxillary apparatuses of extant Prionognatha have been interpreted as evidence of jaw replacement (KielanJaworowska, 1966;Colbath, 1987). In the moulting process of D. aciculata there is no stage where the jaw appears incompletely developed since the new jaw develops hidden in the pulp cavity.…”

Section: Discussionmentioning

confidence: 99%

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Replacement of adult maxillary jaws in Eunicida (Polychaeta)

Paxton¹

2006

Sci. Mar.

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Jaw morphology and ontogeny in five species of Ophryotrocha

Macnaughton

Worsaae

Eibye‐Jacobsen

2009

Journal of Morphology

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Detailed scanning electron microscopy of jaws within the genus Ophryotrocha (Dorvilleidae, Annelida) was performed on 871 jaw parts. The investigations resulted in new understandings of the ontogeny and jaw morphology and have systematic implications for the family. Five species in the genus (Ophryotrocha alborana, O. diadema, O. gracilis, O. hartmanni, and O. labronica pacifica) were kept in culture, and the development of the jaws was studied by sampling throughout their life history. Ophryotrocha species have mandibular plates that remain the same throughout ontogeny, whereas the posterior shafts elongate. Both mandibular plate morphology and shaft ontogeny have species-specific distinctions. In Ophryotrocha, the maxillae can be assigned to three to four distinct types, which are replaced by moulting. The maxillary morphology and developmental stages at which moults occur are species specific, although with broad intervals. A redefinition is given for some of the basic jaw elements, and new homologies are proposed for structures that are also present across other dorvilleid taxa.

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Evidence for shedding of maxillary jaws in eunicoid polychaetes

Cited by 18 publications

References 5 publications

Polychaete systematics: Past and present

Polychaete systematics: Past and present

Replacement of adult maxillary jaws in Eunicida (Polychaeta)

Jaw morphology and ontogeny in five species of Ophryotrocha

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