Hydrozoa |
Narcomedusae |
Aeginidae
Environment: milieu / climate zone / Mức độ sâu / distribution range
Sinh thái học
Tầng nổi. Polar
Antarctic Atlantic: Southern Ocean.
Length at first maturity / Bộ gần gũi / Weight / Age
Chín muồi sinh dục: Lm ?  range ? - ? cm Max length : 9.5 cm WD con đực/không giới tính; (Tài liệu tham khảo 7450)
Umbrella transparent and yellowish, disc-shaped, 9.5 cm in diameter, flattened, smooth, with thin but firm mesoglea. Stomach circular, very large, 7.7 cm in diameter including stomach pouches, mouth circular with no pronounced lips; stomach wall thin, yellowish and slightly opaque. Stomach pouches 31, interradial, irregular in shape ranging from rectangular to square, each one with a prominent globular gelatinous protuberance of the umbrellar mesoglea contained within the distal half, giving the general appearance of a rosary chain within the circumference of the umbrella. Each mesogleal protuberance is completely laterally contained within each stomach pouch cavity, without attachments to the lateral walls, and extends into the subumbrella, almost but not completely blocking the distal-most portion of the stomach pouch. Marginal lappets 31 to 32, interradial, larger than stomach pouches, mostly rectangular in shape but a few slightly trapezoidal (minor base centripetal), with distal corners rounded. Peripheral canal system present. Canals uniformally wide, usually wider than the central part of each lappet, and extending vertically along both sides of each peronia. Otoporpae absent. Tentacles 31 (plus one partially developed tentacle base), about 4 to 5 cm in length, rising from roots of variable length embedded between the distal portions of stomach pouches. Peronia 32, fusiform, simple, of irregular length, without cnidocysts, tapering out distally. Gonads not observed. Velum complete, very thin, 0.2 cm wide.
Life cycle and mating behavior
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Eggs | Sự sinh sản | Larvae
Members of the order Narcomedusae include L-form hydroids. Life cycle: The zygote develops into planula and later into polyp then into free-swimming medusa.
Fuentes, V. and F. Pagès. 2006. (Tài liệu tham khảo 7450)
IUCN Red List Status
(Tài liệu tham khảo 130435: Version 2024-2)
CITES status (Tài liệu tham khảo 108899)
Not Evaluated
CMS (Tài liệu tham khảo 116361)
Not Evaluated
Threat to humans
Harmless
Human uses
| FishSource |
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Thêm thông tin
Sinh thái dinh dưỡngCác loại thức ăn
Thành phần thức ăn
Thành phần thức ăn
Food rations
Các động vật ăn mồi
Sinh thái họcSinh thái học
Population dynamicsSự sinh trưởng
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversion
Bổ xung
Sự phong phú
Life cycleSự tái sinh sảnChín muồi sinh dụcSự sinh sảnĐẻ trứngEggsEgg developmentLarvaeSự biến động ấu trùng Human RelatedAquaculture profiles
Stamps, coins, misc.
Các nguồn internet
Estimates based on models
Vulnerability
Low vulnerability (10 of 100).