Polyascus

{{Automatic taxobox

| taxon = Polyascus

| authority = Glenner, Lützen & Takahashi, 2003

| type_species = Sacculina polygenea

| type_species_authority = Lützen & Takahashi, 1997

| display_parents = 4

}}

Polyascus is a genus of barnacles in infraclass Rhizocephala. It was circumscribed in 2003 by Henrik Glenner, Jørgen Lützen, and Tohru Takahashi. They included three species, all transferred from Sacculina. The generic name polyascus (poly "many" + ascus "bag") refers to the typical presence of multiple external sac-like female bodies, known as externae. In Polyascus species, these originate from asexual reproduction.

Species

{{As of|2017}}, WoRMS recognizes the following three species,

all included in the genus's circumscription.

Binominal name (Original combination)	Author citation	Type host	Type locality	Ref
class="wikitable"
Polyascus gregaria (Sacculina gregaria)	{{small\|(Okada & Miyashita, 1935)}}	Eriocheir japonica	Japan	^{apud [http://www.marinespecies.org/aphia.php?p=taxdetails&id=463770 WoRMS]}
Polyascus plana (Sacculina plana)	{{small\|(Boschma, 1933)}}	"Grapsus strigosus" (=Grapsus albolineatus)	"Takao, South Formosa" (=Kaohsiung City, Taiwan)
Polyascus polygenea (Sacculina polygenea)	{{small\|(Lützen & Takahashi, 1997)}}	Hemigrapsus sanguineus	"Inuki, Oyano Island, Amakusa Islands, Kyushu"

References

{{Reflist|refs=

{{WoRMS|author=Boyko, Christopher B.|author2=Boxshall, G. |year=2015|title=Polyascus Glenner, Lützen & Takahashi, 2003 |id=463680 |db=Rhizocephala |accessdate=5 October 2017}}

{{cite journal|last1=Glenner|first1=Henrik|last2=Lützen|first2=Jørgen|last3=Takahashi|first3=Tohru|title=Molecular and Morphological Evidence for a Monophyletic Clade of Asexually Reproducing Rhizocephala: Polyascus, New Genus (Cirripedia)|journal=Journal of Crustacean Biology|date=2003|volume=23|issue=3|pages=548–557|doi=10.1651/C-2361|jstor=1549885|doi-access=free}}

{{cite journal|last1=Okada|first1=Y. K.|last2=Miyashit|first2=Y.|title=Sacculinization in Eriocheir japonicus de Haan, with remarks on the occurrence of complete sex-reversal in parasitized male crabs|journal=Memoirs of the College of Science, Kyoto Imperial University|date=1935|volume=10|pages=169–208|series=Ser. B|postscript={{sp}}(fide [http://www.marinespecies.org/aphia.php?p=sourcedetails&id=197604 WoRMS]). Not seen.}}

{{cite journal|last1=Boschma|first1=H.|title=The Rhizocephala in the collection of the British Museum.|journal=Journal of the Linnean Society of London, Zoology|date=1933|volume=38|issue=261|pages=524–529|doi=10.1111/j.1096-3642.1933.tb00995.x|doi-access=}}

{{cite journal|last1=Lützen|first1=Jørgen|last2=Takahashi|first2=Tohru|title=Sacculina polygenea, a new species of rhizocephalan (Cirripedia: Rhizocephala) from Japan, parasitic on the intertidal crab Hemigrapsus sanguineus (De Haan, 1835) (Decapoda: Brachyura: Grapsidae)|journal=Crustacean Research|date=1997|volume=26|pages=103–108|doi=10.18353/crustacea.26.0_103|doi-access=free}}

}}

Category:Barnacles

Category:Parasites of crustaceans

Category:Parasitic crustaceans

Category:Crustacean genera