Polyascus

Polyascus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Maxillopoda
Infraclass:	Cirripedia
Order:	Kentrogonida
Family:	Sacculinidae
Genus:	Polyascus; Glenner, Lützen & Takahashi, 2003
Type species
	Sacculina polygenea; Lützen & Takahashi, 1997

Polyascus is a genus of barnacles in superorder 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.[1]

Species

As of 2017, WoRMS recognizes the following three species, all included in the genus's circumscription.[2]

Binominal name (Original combination)	Author citation	Type host	Type locality	Ref
Polyascus gregaria (Sacculina gregaria)	(Okada & Miyashita, 1935)	Eriocheir japonica	Japan	[3]^{apud WoRMS}
Polyascus plana (Sacculina plana)	(Boschma, 1933)	"Grapsus strigosus" (=Grapsus albolineatus)	"Takao, South Formosa" (=Kaohsiung City, Taiwan)	[4]
Polyascus polygenea (Sacculina polygenea)	(Lützen & Takahashi, 1997)	Hemigrapsus sanguineus	"Inuki, Oyano Island, Amakusa Islands, Kyushu"	[5]

References

Glenner, Henrik; Lützen, Jørgen; Takahashi, Tohru (2003). "Molecular and Morphological Evidence for a Monophyletic Clade of Asexually Reproducing Rhizocephala: Polyascus, New Genus (Cirripedia)". Journal of Crustacean Biology. 23 (3): 548–557. doi:10.1651/C-2361. JSTOR 1549885.
Boyko, Christopher B.; Boxshall, G. (2015). "Polyascus Glenner, Lützen & Takahashi, 2003". WoRMS. World Register of Marine Species. Retrieved 5 October 2017.
Okada, Y. K.; Miyashit, Y. (1935). "Sacculinization in Eriocheir japonicus de Haan, with remarks on the occurrence of complete sex-reversal in parasitized male crabs". Memoirs of the College of Science, Kyoto Imperial University. Ser. B. 10: 169–208 (fide WoRMS). Not seen.
Boschma, H. (1933). "The Rhizocephala in the collection of the British Museum". Journal of the Linnean Society of London, Zoology. 38 (261): 524–529. doi:10.1111/j.1096-3642.1933.tb00995.x.
Lützen, Jørgen; Takahashi, Tohru (1997). "Sacculina polygenea, a new species of rhizocephalan (Cirripedia: Rhizocephala) from Japan, parasitic on the intertidal crab Hemigrapsus sanguineus (De Haan, 1835) (Decapoda: Brachyura: Grapsidae)". Crustacean Research. 26: 103–108. doi:10.18353/crustacea.26.0_103.

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[Glenner_et_al.,_2003-1] Glenner, Henrik; Lützen, Jørgen; Takahashi, Tohru (2003). "Molecular and Morphological Evidence for a Monophyletic Clade of Asexually Reproducing Rhizocephala: Polyascus, New Genus (Cirripedia)". Journal of Crustacean Biology. 23 (3): 548–557. doi:10.1651/C-2361. JSTOR 1549885.

[WoRMS-2] Boyko, Christopher B.; Boxshall, G. (2015). "Polyascus Glenner, Lützen & Takahashi, 2003". WoRMS. World Register of Marine Species. Retrieved 5 October 2017.

[Okada_et_al.,_1935-3] Okada, Y. K.; Miyashit, Y. (1935). "Sacculinization in Eriocheir japonicus de Haan, with remarks on the occurrence of complete sex-reversal in parasitized male crabs". Memoirs of the College of Science, Kyoto Imperial University. Ser. B. 10: 169–208 (fide WoRMS). Not seen.

[Boschma,_1933-4] Boschma, H. (1933). "The Rhizocephala in the collection of the British Museum". Journal of the Linnean Society of London, Zoology. 38 (261): 524–529. doi:10.1111/j.1096-3642.1933.tb00995.x.

[Lutzen_et_al.,_1997-5] Lützen, Jørgen; Takahashi, Tohru (1997). "Sacculina polygenea, a new species of rhizocephalan (Cirripedia: Rhizocephala) from Japan, parasitic on the intertidal crab Hemigrapsus sanguineus (De Haan, 1835) (Decapoda: Brachyura: Grapsidae)". Crustacean Research. 26: 103–108. doi:10.18353/crustacea.26.0_103.