Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy
The number of stadia during post-embryonic development is supposed to be fixed in most species of the millipede order Polydesmida. For the first time since 1928, additional moults were observed in two males of Polydesmus angustus Latzel, 1884 reared in the laboratory. These ‘elongatus&...
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| Format: | Article |
| Language: | English |
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Pensoft Publishers
2011-12-01
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| Series: | ZooKeys |
| Online Access: | http://zookeys.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=2254 |
| _version_ | 1819048067202023424 |
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| author | Jean-Francois David Jean-Jacques Geoffroy |
| author_facet | Jean-Francois David Jean-Jacques Geoffroy |
| author_sort | Jean-Francois David |
| collection | DOAJ |
| description | The number of stadia during post-embryonic development is supposed to be fixed in most species of the millipede order Polydesmida. For the first time since 1928, additional moults were observed in two males of Polydesmus angustus Latzel, 1884 reared in the laboratory. These ‘elongatus’ males sensu Verhoeff reached stadium IX instead of stadium VIII, with addition of a further podous ring (32 pairs of legs). One male had well-developed gonopods at stadium VIII, which regressed at stadium IX; the other had no gonopods at stadium VIII, which developed at stadium IX. The two cases correspond to the ‘regressionis’ and ‘progressionis’ forms described by Verhoeff in Polydesmus complanatus (Linnaeus, 1761), which confirms entirely his results. Additional moults appear to be associated with small body sizes and possible underlying mechanisms are discussed. Comparisons between millipede orders indicate that post-embryonic development is less strictly canalized in Polydesmida than in Chordeumatida. This implies that the adult number of body rings is of limited taxonomic value in Polydesmida and should not be viewed as a character of generic importance. |
| first_indexed | 2024-12-21T11:10:21Z |
| format | Article |
| id | doaj.art-3c875753fb254c5cb6c1a53060708618 |
| institution | Directory Open Access Journal |
| issn | 1313-2989 1313-2970 |
| language | English |
| last_indexed | 2024-12-21T11:10:21Z |
| publishDate | 2011-12-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | ZooKeys |
| spelling | doaj.art-3c875753fb254c5cb6c1a530607086182022-12-21T19:06:06ZengPensoft PublishersZooKeys1313-29891313-29702011-12-011560414810.3897/zookeys.156.20452254Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomyJean-Francois DavidJean-Jacques GeoffroyThe number of stadia during post-embryonic development is supposed to be fixed in most species of the millipede order Polydesmida. For the first time since 1928, additional moults were observed in two males of Polydesmus angustus Latzel, 1884 reared in the laboratory. These ‘elongatus’ males sensu Verhoeff reached stadium IX instead of stadium VIII, with addition of a further podous ring (32 pairs of legs). One male had well-developed gonopods at stadium VIII, which regressed at stadium IX; the other had no gonopods at stadium VIII, which developed at stadium IX. The two cases correspond to the ‘regressionis’ and ‘progressionis’ forms described by Verhoeff in Polydesmus complanatus (Linnaeus, 1761), which confirms entirely his results. Additional moults appear to be associated with small body sizes and possible underlying mechanisms are discussed. Comparisons between millipede orders indicate that post-embryonic development is less strictly canalized in Polydesmida than in Chordeumatida. This implies that the adult number of body rings is of limited taxonomic value in Polydesmida and should not be viewed as a character of generic importance.http://zookeys.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=2254 |
| spellingShingle | Jean-Francois David Jean-Jacques Geoffroy Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy ZooKeys |
| title | Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy |
| title_full | Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy |
| title_fullStr | Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy |
| title_full_unstemmed | Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy |
| title_short | Additional moults into ‘elongatus’ males in laboratory-reared Polydesmus angustus Latzel, 1884 (Diplopoda, Polydesmida, Polydesmidae) – implications for taxonomy |
| title_sort | additional moults into elongatus males in laboratory reared polydesmus angustus latzel 1884 diplopoda polydesmida polydesmidae implications for taxonomy |
| url | http://zookeys.pensoft.net/lib/ajax_srv/article_elements_srv.php?action=download_pdf&item_id=2254 |
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