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Nothria and Anchinothria (Annelida: Onuphidae) from eastern Australian waters, with a discussion of ontogenetic variation of diagnostic characters

Published online by Cambridge University Press:  26 March 2013

Nataliya Budaeva  and
Hannelore Paxton
Nataliya Budaeva*
Affiliation:
Australian Museum, 6 College Street, Sydney, NSW 2010, Australia P.P. Shirshov Institute of Oceanology Russian Academy of Sciences, Nakhimovsky pr. 36, 117997, Moscow, Russia
Hannelore Paxton
Affiliation:
Australian Museum, 6 College Street, Sydney, NSW 2010, Australia Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia
*
Correspondence should be addressed to: N. Budaeva, P.P. Shirsov Institute of Oceanology Russian Academy of Sciences, Nakhimovsky pr. 36, 11797 Moscow, Russian email: [email protected]
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Abstract

Nothria and Anchinothria, two sister genera of onuphid worms were studied from eastern Australian waters. Nothria abyssia, with a wide distribution in Pacific and Antarctic waters is reported from slope depths south-east of Australia, while N. otsuchiensis, described from Japanese waters, was found along the eastern coast of Australia from shallow subtidal to deep slope areas. Anchinothria parvula sp. nov. is described, based on the presence of uni- and bidentate pseudocompound falcigers in the first three pairs of parapodia, absence of branchiae and appearance of limbate chaetae from chaetiger 2, subacicular hooks from chaetigers 6–8 and pectinate chaetae from chaetiger 14. The new species represents the first record of the genus in Australian waters. Ontogenetic variation of chaetal composition and morphology of parapodia was estimated in two Nothria species examined. Three size-related morphotypes with different chaetal composition and morphology of anterior falcigers were revealed in N. abyssia and N. otsuchiensis. The number of chaetigers with pseudocompound falcigers is the only character independent of size of the specimens in both examined species. Distribution of subacicular hooks and postchaetal lobes is shown to be size-dependent. The following characters are considered of diagnostic value only when scored in adults: presence/absence of simple falcigers in anterior parapodia; chaetiger of origin of limbate chaetae, pectinate chaetae, and subacicular hooks; and number of chaetigers with auricular prechaetal lobes and digitiform postchaetal lobes. The use of adult specimens with the final set of definitive morphological structures for diagnoses of Nothria species is suggested.

Keywords

polychaetesnew speciesslopedeep seadistributionparapodiaredescriptionchaetal replacement
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 6 , September 2013 , pp. 1481 - 1502
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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