Athecate Hydroids

Dipurena strangulata.

Hydra vulgaris.. 1. Hydra with ova and young, unhatcher.; Egg ready to burst its shell.

Figure 21.Color figures of skeleton of various Alaskan stylasterids: A Stylaster parageus parageus, B Stylaster parageus columbiensis C Stylaster elassotomus D Stylaster crassiseptum E–G Stylaster alaskanus. A holotype, USNM 42871 B holotype, USNM 1122462 C holotype, USNM 43268 D holotype, USNM 1122531 E holotype of Stylaster gemmascens alaskanus, USNM 43269 F holotype of Stylaster cancellatus, USNM 43267 G large colony, USNM 1122454.

Hydra viridis (Trembley). 1. Hydra magnified, bearing an embryo ready to detach itself.; 2. Animal...

Protiara haeckeli.

Figure 26.Stylaster crassiseptum A, D, H–I male paratype, USNM 112519, B–C, E–G, J holotype (female), USNM 1122531: A stereo view of cyclosystems and a cluster of male ampullae B branch segment showing sympodial arrangement of cyclosystems C–D cyclosystems E thick pseudosepta and thin dactylotomes F coenosteal texture G robust dactylostyle H stereo view of gastropore tube and male ampulla I gastrostyle surrounded by well–developed ring palisade J female ampulla.

Hybocodon pendula.

Figure 21. Color figures of skeleton of various Alaskan stylasterids: A Stylaster parageus parageus, B Stylaster parageus columbiensis C Stylaster elassotomus D Stylaster crassiseptum E–G Stylaster alaskanus. A holotype, USNM 42871 B holotype, USNM 1122462 C holotype, USNM 43268 D holotype, USNM 1122531 E holotype of Stylaster gemmascens alaskanus, USNM 43269 F holotype of Stylaster cancellatus, USNM 43267 G large colony, USNM 1122454.

Eudendrium album Nutting. A. Hydranth with male gonophores.

Figure 23. Stylaster parageus columbiensis, A–H, J holotype (male), USNM 1122462, I female paratype, USNM 1117112: A stereo view of branch segment including male ampullae B a cyclosystem C longitudinal fracture of a cyclosystem D stereo view of a gastrostyle and rudimentary ring palisade E–F rough and smooth coenosteal texture G gastrostyle tip and ring palisade H two dactylostyles I female ampulla J male ampullae.

Hydractinia polyclina Ag. A.Nutritive 'person.' B. Reproductive persons. C.Spiral zooids or fighting persons.

Colony consists of feeding and reproductive polypsabout 5 cm high.

Here are two colonies, pink and purple, of California Hydrocoral--they are not anthozoan 'true' corals. These colonies were at 18 m depth, but the species extends into deep water. The colonies have separate sexes, they are slow-growing, and these could be 100 years old.

Don't touch hydroids; they can sting you. This one is growing on kelp.

No polyp stage of this hydrozoan has been recognized. Note the prominent eye spots.

Porifera

Category hierarchy: Biomes | Water & Wetlands | Coastal EnvironmentsDescription: By-the-wind sailor jellyfish washed onto a sandy beach as well as shells and clumps of Sargassum seaweed.Capture device: FinePix S3100Capture details: 6x optical zoom lens; Effective pixels 4.0 millionOriginal date: 20100405|||090837Locality: Latitude: 2.722254740000000e+001; Longitude: -8.018115670000000e+001