Daily Archives: Tuesday,April 30, 2002

Hydractinia armata: The Race Rocks Taxonomy

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Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Order Anthoathecata
Family Hydractitinidae
Genus Hydractinia
Species armata (Fraser,1940)

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of: Dr. Anita Brinckmann- Voss. They can not be used or modified without her written permission.

Hybocodon prolifera : Race Rocks Taxonomy: Photomicrography of Dr. Anita Brinckmann-Voss

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hybocodon_prolifer_hydroidMedusa of Hybocodon prolifer. Although this medusa was collected elsewhere (off Malcolm Island, B.C.) the hydroid ofHybocodon prolifer is common in Race Rocks in deep tidal pools and subtidal. Medusa production is in Winter until March in Race Rocks water temperatures. The medusa buds hydroids from its one tentacle and eggs from the manubrium. (see picture below with medusa budding )

2_4hybocodon_prolifer_hydThis hydroid grows in low tide pools, and subtidal on various substrates as large barnacles and rock scallops. The medusae bud in late winter. Without medusae, they are difficult to distinguish from Ectopleura (former Tubularia) hydroids.

54_15hybocodon_prolifer_med

The medusa of Hybocodon sp.

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of: Dr. Anita Brinckmann- Voss. .They can not be used or modified without her written permission.

See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/

Tubularia regalis: Race Rocks Taxonomy

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tubularia_wholeTubularia regalis Boeck, 1860 (family Tubulariidae).
This large Tubularia with a stem up to 20 cm was originally described from Northern Norway. It was later found to be a circumpolar species, with records from Greenland , Bering Sea and Sea of Okhotsk. The present record from Swordfish Island, Juan de Fuca Strait, is the most southern record of this species, and the first from the Canadian Pacific coast.The stems of this species are often host to other hydroid species.

 

This clip profiles the Pearson College Divers and the invertebrates of a cave on an island a kilometer from Race Rocks. The hydroid species, Tubularia sp. shown near the end of the video is a rare species, which according to Dr. Anita Brinckmann-Voss has so far been found in only two locations; here and in Norway. Note it is growing in association with colonial ascidians. We have observed this species here over the last twenty years. It is very limited in distribution, with no more than one or two polyps appearing at any one time. It’s height is 15 cm. Video taken by Pearson College Divers, edited by GF.

Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
 Order Anthoathecatae
Family Tubulariidae
Genus Tubularia
species regalis, Brook 1860

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of: Dr. Anita Brinckmann- Voss. . They can not be used or modified without her written permission.

Rhysia fletcheri: Race Rocks Taxonomy: Photomicrography of Dr. Anita Brinckmann-Voss

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Rhysia fletcheri is a new species of colonial atheccate hydroid described by Dr. Anita Brinckmann-Voss from samples collected at Race Rocks and Friday harbour.

Rhysia fletcheri(female polyps above) is a new species of colonial atheccate hydroid described by Dr. Anita Brinckmann-Voss from samples collected at Race Rocks and Friday harbour.

rhysiamale

rhysiafletcheri Rhysia fletcheri male polyps

Rhysia fletcheri differs from Rhysia autumnalis and Rhysia halecii in the gastrozooid having distinctive cnidocyst clusters on its hypostome and few, thick tentacles. Most of its female gonozooids have no tentacles. Colonies of R. fletcheri are without dactylozooids. The majority of R. fletcheri colonies are found growing on large barnacles or among the hydrorhiza of large thecate hydrozoans. Rhysia fletcheri occurs in relatively sheltered waters of the San Juan Islands and on the exposed rocky coast of southern Vancouver Island.

For the  COMPLETE TEXT OF THE PAPER DESCRIBING THIS SPECIES see:BRINCKMANN-VOSS, A., LICKEY, D. M., and MILLS C. E. 1993. Rhysia,fletcheri(Cnidaria, Hydrozoa, Rhysiidae), a new species of colonial hydroid from Vancouver Island (British Columbia, Canada) and the San Juan Archipelago (Washington, U.S.A.). Can. J. Zool. 71: 401-406.

Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Subclass Leptolida
Order Anthoathecatae
Family Rhysiidae
Genus Rhysia
Species fletcheri

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of: Dr. Anita Brinckmann- Voss..They can not be used or modified without her written permission.

See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/

Rhizogeton nematophorum– Photomicrography of Dr. Anita Brinckmann-Voss : The Race Rocks Taxonomy

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Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Order Anthomedusae
Family Clavidae
Genus Rhizogeton
Species nematophorum
Common Name:

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999-All Images on this page are the property of: Dr. Anita Brinckmann- Voss..They can not be used or modified without her written permission.

Sarsia sp. :Photomicrography of Dr. Anita Brinckmann-Voss : The Race Rocks Taxonomy

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61_19sarsia_eximia_hyd

Single Polyp

Colony

Colony

 

Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Family Anthoathecatae
Genus Sarsia
Species sp.

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of:Dr. Anita Brinckmann- Voss. . They can not be used or modified without her written permission.

See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/

Garveia annulata : Hydroid Photomicrography of Dr. Anita Brinckmann-Voss–The Race Rocks Taxonomy

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Garveia annulata (Hydrozoa, Anthoathecatae,Bougainvilliidae)

garv

Garveia annulata Nutting, 1901


All pictures are protected by copyright : December, 2001, Dr. Anita Brinckmann-Voss..
and /or Lester B. Pearson College. for consideration of permission to use for educational purposes only.

Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Order Anthoathecatae
Family Bouagainvilliidae
Genus Garveia
Species annulata
Nutting, 1901

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999–All Images on this page are the property of:Dr. Anita Brinckmann- Voss. . They can not be used or modified without her written permission.
See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/

–with the tail of the fish in it’s talons and the fish head bouncing off the water surface

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Tuesday, April 30, 2002
Good Evening
TEMPERATURE: Max. 16.5 ºC »» Min. 5.7 ºC »» Reset 10.3 ºC »» Hi – Low and Totals For April »» Hi 16.5 ºC day 30 »» Low 3.1 ºC day 08 »» Total Rain 61.7 mm »» No snow
MARINE LIFE: 3 bald eagles( 1 juvenile ) With the very low tide this morning it was a seafood buffet for the birds and otters.Watched two determined gulls try to drag a large fish carcass that looked like a ling cod, out of water on to the rocks.They worked at this for over 20 minutes to no avail. Suddenly out of the fog the young eagle landed 2-3 metres away from the gulls which moved out of the way. The big bird had little trouble getting the fish carcass up on the rocks where it had a better hold then spent about 15 minutes feeding, all the while the gulls were getting more brazen, moving closer to maybe take back the fish.Not about to share, the eagle took off towards the southeast rocks with the tail of the fish in it’s talons and the fish head bouncing off the water surface several times before it was completely airborne. When the eagle had it’s fill the gulls and crows moved in to scrounge what they could.
HUMAN INTERACTION: 2 Ecotour boats and 3 Pleasure craft through the reserve today.
posted by Carol or Mike S at 6:18 PM
Good Morning
WEATHER: Sky Partly Obscured »» Vis. 2 – 4 Miles Fog »» Wind West 11 Knots »» Sea Rippled
posted by Carol or Mike S at 6:25 AM

Ectopleura marina : The Race Rocks Taxonomy

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ah30810ectopleura

This close-up of an Ectopleura marina was photographed by Adam Harding at West Race Rocks around 60-70ft– 23/08/10

 

The three pictures above of Ectopleura were taken by Ryan Murphy in September 2010.

Physical Description: The Ectopleura marina are in polyp form. Polyps are cylindrical, with one end attached and the other free with tentacles and a mouth for feeding. The polyp stems are usually 2 – 5 cm long, with 18 tentacles in two whorls around the mouth, and 22 – 26 tentacles away from the mouth. Unlike their close relative, Ectopleura marina are solitary, or in groups of well-spaced individuals. Feeding polyps are pink, hence their common name pink-mouth hydroid. Global Distribution: The Ectopleura marina is found on the western coast of North America. Habitat: Ectopleura marina have been found on rocks in low intertidal and subtidal zones where there is fast flowing current. They are fairly common on exposed or semi-protected rocky shores, and are also found on floats.
Feeding: When starved for one or two days, polyps will eat active copepods, whereas when well-fed, polyps do not feed or respond to active prey. The polyps catch and stun their prey in their whorl of tentacles. They eat small crustaceans, larvae, chaetognaths, and annelid worms. When developing, polyps feed on eggs of various other invertebrates, plankton, and fish larvae.

Predators: No information on predators has been found, however the tentacles of hydroids contain poisons (nematocysts) that are a good defense against predators.Reproduction: Each colony of hydroids is usually of a single sex, although some hermaphrodites have been found. Medusa buds are produced in clusters which are attached between the two whorls of tentacles on the polyp. These medusoids develop 3 – 5 and do not come free, but rather stay small and attached until gametes develop, and usually die soon after. Sperm is shed into the water, but eggs stay in the medosoids and are not released until they have developed into larvae, which resemble the feeding polyps.

Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Order Hydroida
Family Tubulariidae
Genus Ectopleura
Species marina
Common Name: pink mouth hydroid

see this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/

Interesting Fact: Ectopleura marina was formerly known as Tubularia marina. It also belongs to one of the most primitive and most diverse groups of multicellular organisms. References: “Hydrozoa.” Wikipedia. Wikipedia Encyclopedia. 12 Nov. 2005 Kozloff, Eugene N. Marine Invertebrates of the Pacific Northewest. Seattle: University of Washington P, 1996. Morris, R H., D P. Abbott, and E C. Haderlie. Intertidal Invertebrates of California. California: Stanford UP, 1980. “Phylum Cnidaria.” BC Marine Life Cnidaria. 13 Nov. 2005 <http://www.elasmodiver.com/BCMarinelife/BCML%20cnidaria.htm>. Strathmann, Megumi F. Reproduction and Development of Marine Invertebrates of North Pacific Coast. Seattle: Washington UP, 1987.
This file is provided as part of a collaborative effort by the students, volunteers,faculty and staff of Lester B. Pearson College–Grace Ho, 2005

Eudendrium sp. : Race Rocks Taxonomy — Photomicrography of Dr. Anita Brinckmann-Voss

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Domain Eukarya
Kingdom Animalia
Phylum Cnidaria
Class Hydrozoa
Order Anthoathecatae
Family Eudendriidae
Genus Eudendrium
Species sp.
Common Name:

This file is provided as part of a collaborative effort by Lester B. Pearson College and local scientists. Copyrighted 1999-All Images on this page are the property of:Dr. Anita Brinckmann- Voss..They can not be used or modified without her written permission. See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/