Sphaeromimus: Difference between revisions
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'''''Sphaeromimus''''' is a genus of [[giant pill millipedes]] (order [[Sphaerotheriida]]) endemic to southeastern [[Madagascar]].<ref name=WP>{{cite journal |author=T. Wesener & P. Sierwald |year=2005 |title= New giant pill millipede species from the littoral forest of Madagascar (Diplopoda, Sphaerotheriida, Zoosphaerium) |journal=[[Zootaxa]] |volume=1097 |pages=1–60 |url=http://www.mapress.com/zootaxa/2005f/zt01097p060.pdf |format=[[Portable Document Format|PDF]]}}</ref> The genus was first described by [[Henry de Saussure]] and Leo Zehntner in 1902.<ref>{{cite journal |author= H. DeSaussure and L. Zehnter |year=1902 |title= Myriapodes de Madagascar |journal=[[In Grandidier, Histoire, physique, naturelle, et politique de Madagascar ]] |volume=27 |pages=i-vii, 1-356, pl. 13, 14, 15}}</ref>, but until 2005 was only know from a single male, whose appearance was so unusual that the authors thought it might represent a mislabeled giant pill-millipede from India.<ref>{{cite journal |author=C. A. W Jeekel |year=1999 |title= A new pill-millipede from Madagascar, with a catalogue of the species hitherto described from the island (Diplopoda- Sphaerotheriida) |journal=[[Myriapod Memoranda ]] |volume=I |pages=5–21}}</ref> It belongs to the [[family]] [[Arthrosphaeridae]] which, besides ''Sphaeromimus'' includes the Malagasy genera, ''[[Zoosphaerium]]'' and ''[[Microsphaerotherium]]'' and the Indian genus ''[[Arthrosphaera]]''.<ref name=WS> {{cite journal |author=T. Wesener & D. van den Spiegel |year=2009 |title= A first phylogenetic analysis of Giant Pill-Millipedes (Diplopoda: Sphaerotheriida), a new model Gondwanan taxon, with special emphasis on island gigantism |journal=[[Cladistics]] |volume=25 |pages=545-573}}</ref> Recent research has shown that ''Sphaeromimus'' is more closely related to the Indian genus ''Arthrosphaera'' than to other Malagasy genera.<ref name=WS/> Three species have been described within ''Sphaeromimus'', [[S. musicus|''S. musicus'']], ''[[S. splendidus]]'', and ''[[S. inexpectatus]]'', although some undescribed species have been found recently.<ref name=WP/> All populations inhabit the leaf litter of the Malagasy [[rainforests]], except for one undescribed species which was found in a [[cave]] and the [[type species]] ''S. musicus'' which has only been found in the dry [[spiny forest]]. Recent research has shown that ''Sphaeromimus'' [[populations]] are highly endemic since individuals are not able to travel between forest patches. Movement between populations is becoming more limited since forest is being destroyed at a rapid rate on Madagascar. |
'''''Sphaeromimus''''' is a genus of [[giant pill millipedes]] (order [[Sphaerotheriida]]) endemic to southeastern [[Madagascar]].<ref name=WP>{{cite journal |author=T. Wesener & P. Sierwald |year=2005 |title= New giant pill millipede species from the littoral forest of Madagascar (Diplopoda, Sphaerotheriida, Zoosphaerium) |journal=[[Zootaxa]] |volume=1097 |pages=1–60 |url=http://www.mapress.com/zootaxa/2005f/zt01097p060.pdf |format=[[Portable Document Format|PDF]]}}</ref> The genus was first described by [[Henry de Saussure]] and Leo Zehntner in 1902.<ref>{{cite journal |author= H. DeSaussure and L. Zehnter |year=1902 |title= Myriapodes de Madagascar |journal=[[In Grandidier, Histoire, physique, naturelle, et politique de Madagascar ]] |volume=27 |pages=i-vii, 1-356, pl. 13, 14, 15}}</ref>, but until 2005 was only know from a single male, whose appearance was so unusual that the authors thought it might represent a mislabeled giant pill-millipede from India.<ref>{{cite journal |author=C. A. W Jeekel |year=1999 |title= A new pill-millipede from Madagascar, with a catalogue of the species hitherto described from the island (Diplopoda- Sphaerotheriida) |journal=[[Myriapod Memoranda ]] |volume=I |pages=5–21}}</ref> It belongs to the [[family]] [[Arthrosphaeridae]] which, besides ''Sphaeromimus'' includes the Malagasy genera, ''[[Zoosphaerium]]'' and ''[[Microsphaerotherium]]'' and the Indian genus ''[[Arthrosphaera]]''.<ref name=WS> {{cite journal |author=T. Wesener & D. van den Spiegel |year=2009 |title= A first phylogenetic analysis of Giant Pill-Millipedes (Diplopoda: Sphaerotheriida), a new model Gondwanan taxon, with special emphasis on island gigantism |journal=[[Cladistics]] |volume=25 |pages=545-573}}</ref> Recent research has shown that ''Sphaeromimus'' is more closely related to the Indian genus ''Arthrosphaera'' than to other Malagasy genera.<ref name=WS/> Three species have been described within ''Sphaeromimus'', [[S. musicus|''S. musicus'']], ''[[S. splendidus]]'', and ''[[S. inexpectatus]]'', although some undescribed species have been found recently.<ref name=WP/> All populations inhabit the leaf litter of the Malagasy [[rainforests]], except for one undescribed species which was found in a [[cave]] and the [[type species]] ''S. musicus'' which has only been found in the dry [[spiny forest]]. Recent research has shown that ''Sphaeromimus'' [[populations]] are highly endemic since individuals are not able to travel between forest patches. Movement between populations is becoming more limited since forest is being destroyed at a rapid rate on Madagascar. |
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Like other giant pill millipedes, ''Sphaeromimus'' individuals can roll up into a ball for protection. The size of this ball is typically equal to that of a [[ping-pong ball]] and can sometimes even be larger. The most interesting traits of this genus are the [[sexual characters]]. Males have a structure on their anterior [[telopod]], known as the harp, which has several [[stridulation]] ribs and is able to produce sounds when rubbed against a sclerotized knob on the leg. They probably use this structure during courtship in order to prevent females from rolling up into a ball. When a female is receptive, it is believed that males use their posterior telopods in order to hold her down for [[copulation]]. Females, on the other hand, have a structure on their subanal plate called the washboard which, similar to the male harp, contains stridulation ribs and produces sounds. The harp and washboard are present in all species of the family Arthrosphaeridae, but especially well developed in ''Sphaeromimus'', |
Like other giant pill millipedes, ''Sphaeromimus'' individuals can roll up into a ball for protection. The size of this ball is typically equal to that of a [[ping-pong ball]] and can sometimes even be larger. The most interesting traits of this genus are the [[sexual characters]]. Males have a structure on their anterior [[telopod]], known as the harp, which has several [[stridulation]] ribs and is able to produce sounds when rubbed against a sclerotized knob on the leg. They probably use this structure during courtship in order to prevent females from rolling up into a ball. When a female is receptive, it is believed that males use their posterior telopods in order to hold her down for [[copulation]]. Females, on the other hand, have a structure on their subanal plate called the washboard which, similar to the male harp, contains stridulation ribs and produces sounds. The harp and washboard are present in all species of the family Arthrosphaeridae, but are especially well developed in ''Sphaeromimus'', with males have 3–7 ribs on each harp, and females 8–16 ribs on each washboard.<ref name=WP/> |
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Revision as of 04:13, 13 August 2010
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| Order: | Brandt, 1833
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| Genus: | Sphaeromimus de Saussure and Zehnter, 1902
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Sphaeromimus is a genus of giant pill millipedes (order Sphaerotheriida) endemic to southeastern Madagascar.[1] The genus was first described by Henry de Saussure and Leo Zehntner in 1902.[2], but until 2005 was only know from a single male, whose appearance was so unusual that the authors thought it might represent a mislabeled giant pill-millipede from India.[3] It belongs to the family Arthrosphaeridae which, besides Sphaeromimus includes the Malagasy genera, Zoosphaerium and Microsphaerotherium and the Indian genus Arthrosphaera.[4] Recent research has shown that Sphaeromimus is more closely related to the Indian genus Arthrosphaera than to other Malagasy genera.[4] Three species have been described within Sphaeromimus, S. musicus, S. splendidus, and S. inexpectatus, although some undescribed species have been found recently.[1] All populations inhabit the leaf litter of the Malagasy rainforests, except for one undescribed species which was found in a cave and the type species S. musicus which has only been found in the dry spiny forest. Recent research has shown that Sphaeromimus populations are highly endemic since individuals are not able to travel between forest patches. Movement between populations is becoming more limited since forest is being destroyed at a rapid rate on Madagascar.
Like other giant pill millipedes, Sphaeromimus individuals can roll up into a ball for protection. The size of this ball is typically equal to that of a ping-pong ball and can sometimes even be larger. The most interesting traits of this genus are the sexual characters. Males have a structure on their anterior telopod, known as the harp, which has several stridulation ribs and is able to produce sounds when rubbed against a sclerotized knob on the leg. They probably use this structure during courtship in order to prevent females from rolling up into a ball. When a female is receptive, it is believed that males use their posterior telopods in order to hold her down for copulation. Females, on the other hand, have a structure on their subanal plate called the washboard which, similar to the male harp, contains stridulation ribs and produces sounds. The harp and washboard are present in all species of the family Arthrosphaeridae, but are especially well developed in Sphaeromimus, with males have 3–7 ribs on each harp, and females 8–16 ribs on each washboard.[1]
References
- ^ a b c T. Wesener & P. Sierwald (2005). "New giant pill millipede species from the littoral forest of Madagascar (Diplopoda, Sphaerotheriida, Zoosphaerium)" (PDF). Zootaxa. 1097: 1–60.
- ^ H. DeSaussure and L. Zehnter (1902). "Myriapodes de Madagascar". In Grandidier, Histoire, physique, naturelle, et politique de Madagascar . 27: i–vii, 1–356, pl. 13, 14, 15.
- ^ C. A. W Jeekel (1999). "A new pill-millipede from Madagascar, with a catalogue of the species hitherto described from the island (Diplopoda- Sphaerotheriida)". Myriapod Memoranda . I: 5–21.
- ^ a b T. Wesener & D. van den Spiegel (2009). "A first phylogenetic analysis of Giant Pill-Millipedes (Diplopoda: Sphaerotheriida), a new model Gondwanan taxon, with special emphasis on island gigantism". Cladistics. 25: 545–573.