The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University
This investigation has shown that only three species of Potamopyrgus Stimpson can be recognized from New Zealand, compared with the six species and three subspecies recognized by Suter (1913). The species are, P. antipodum Gray 1843, P. pupoides Hutton 1882, and P. estuarinus n. sp. P. dawbini Powel...
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Massey University
1968
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ftmasseyuniv:oai:mro.massey.ac.nz:10179/3786 2023-05-15T15:33:43+02:00 The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University Winterbourn, Michael John 1968 http://hdl.handle.net/10179/3786 en eng Massey University http://hdl.handle.net/10179/3786 Q111965097 The Author Hydrobiidae Potamopyrgus antipodarum Gastropoda Classification New Zealand Thesis 1968 ftmasseyuniv 2022-08-09T17:10:57Z This investigation has shown that only three species of Potamopyrgus Stimpson can be recognized from New Zealand, compared with the six species and three subspecies recognized by Suter (1913). The species are, P. antipodum Gray 1843, P. pupoides Hutton 1882, and P. estuarinus n. sp. P. dawbini Powell 1955 from the Auckland Islands is probably referable to P. antipodum, but the position of (?) P. melvilli (Hedley 1916) from the Kermadec Islands has not been determined. The European species P. jenkinsi (Smith 1889) cannot be separated from P. antipodum on morphological or anatomical grounds and may also be referable to that species. All species now placed in Fluviopupa Pilsbry 1911 should probably be referred to Potamopyrgus. P. estuarinus and P. pupoides are both smooth-shelled, bisexual, non-ovoviviparous and confined to brackish water. P. antipodum is highly variable in shell size, shape and ornamentation, inhabits fresh and brackish water, is ovoviviparous, and populations may consist entirely of parthenogenetic females, or contain variable numbers of sexually functional males. Rearing of snails in the laboratory has shown that snails do not necessarily breed true with respect to shell ornamentation, and that shell shape and ornamentation is not determined primarily by environmental factors. The shell of P. estuarinus cannot be distinguished from that of some P. antipodum but P. pupoides may be readily identified using shell characters alone. No significant interspecific differences in operculum, external morphology, body pigmentation or structure of the male reproductive system are found but P. pupoides possesses minor radular differences, and P. antipodum differs in the condition of the female reproductive system. The diploid (2n) chromosome number of all three species is 24. Qualitative paper chromatography of crude foot muscle and mantle edge extracts, and quantitative ion-exchange chromatography of shell periostracal protein have disclosed no important biochemical differences between species. P. antipodum ... Thesis Auckland Islands Massey University: Massey Research Online New Zealand |
institution |
Open Polar |
collection |
Massey University: Massey Research Online |
op_collection_id |
ftmasseyuniv |
language |
English |
topic |
Hydrobiidae Potamopyrgus antipodarum Gastropoda Classification New Zealand |
spellingShingle |
Hydrobiidae Potamopyrgus antipodarum Gastropoda Classification New Zealand Winterbourn, Michael John The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
topic_facet |
Hydrobiidae Potamopyrgus antipodarum Gastropoda Classification New Zealand |
description |
This investigation has shown that only three species of Potamopyrgus Stimpson can be recognized from New Zealand, compared with the six species and three subspecies recognized by Suter (1913). The species are, P. antipodum Gray 1843, P. pupoides Hutton 1882, and P. estuarinus n. sp. P. dawbini Powell 1955 from the Auckland Islands is probably referable to P. antipodum, but the position of (?) P. melvilli (Hedley 1916) from the Kermadec Islands has not been determined. The European species P. jenkinsi (Smith 1889) cannot be separated from P. antipodum on morphological or anatomical grounds and may also be referable to that species. All species now placed in Fluviopupa Pilsbry 1911 should probably be referred to Potamopyrgus. P. estuarinus and P. pupoides are both smooth-shelled, bisexual, non-ovoviviparous and confined to brackish water. P. antipodum is highly variable in shell size, shape and ornamentation, inhabits fresh and brackish water, is ovoviviparous, and populations may consist entirely of parthenogenetic females, or contain variable numbers of sexually functional males. Rearing of snails in the laboratory has shown that snails do not necessarily breed true with respect to shell ornamentation, and that shell shape and ornamentation is not determined primarily by environmental factors. The shell of P. estuarinus cannot be distinguished from that of some P. antipodum but P. pupoides may be readily identified using shell characters alone. No significant interspecific differences in operculum, external morphology, body pigmentation or structure of the male reproductive system are found but P. pupoides possesses minor radular differences, and P. antipodum differs in the condition of the female reproductive system. The diploid (2n) chromosome number of all three species is 24. Qualitative paper chromatography of crude foot muscle and mantle edge extracts, and quantitative ion-exchange chromatography of shell periostracal protein have disclosed no important biochemical differences between species. P. antipodum ... |
format |
Thesis |
author |
Winterbourn, Michael John |
author_facet |
Winterbourn, Michael John |
author_sort |
Winterbourn, Michael John |
title |
The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
title_short |
The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
title_full |
The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
title_fullStr |
The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
title_full_unstemmed |
The systematics of the New Zealand species of Potamopyrgus (Mollusca: Hydrobiidae) and studies on the biology of Potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Zoology at Massey University |
title_sort |
systematics of the new zealand species of potamopyrgus (mollusca: hydrobiidae) and studies on the biology of potamopyrgus antipodum : a thesis presented in partial fulfilment of the requirements for the degree of doctor of philosophy in zoology at massey university |
publisher |
Massey University |
publishDate |
1968 |
url |
http://hdl.handle.net/10179/3786 |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Auckland Islands |
genre_facet |
Auckland Islands |
op_relation |
http://hdl.handle.net/10179/3786 Q111965097 |
op_rights |
The Author |
_version_ |
1766364236118753280 |