THE LIFE-CYCLE OF EIRENE LACTEA (MAYER, 1900) AND HELGICIRRHA SCHULZEI HARTLAUB, 1909 (PHYLUM CNIDARIA, CLASS HYDROZOA, ORDER LEPTOMEDUSAE, FAMILY EIRENIDAE)

Medusae were raised from unidentified polyps from the saltwater tanks of the Royal Ontario Museum. Raised to adult stage the medusae proved to be Leptomedusae, Family Eirenidae, species Eirene lactea. The hydroid was not described before. The medusa Helgicirrha schulzei was raised from a hydroid from the Bay of Naples, Italy. The hydroid of Helgicirrha schulzei is a hydroid which was previously thought to be the hydroid of Octorchis gegenbauri (Leptomedusae, Eutimidae)

The hydroid and medusa of Sarsia bella sp. nov. (Hydrozoa, Anthoathecatae, Corynidae), with a correction of the life cycle of Polyorchis penicillatus (Eschscholtz)

A new hydrozoan, Sarsia bella sp. nov. is described in both its hydroid and medusa stage from north of Puget Sound, Washington in the San Juan Islands, USA and off the southernmost tip of Vancouver Island, Canada. The medusa is distinguished from other Sarsia species by 16 exumbrellar nematocyst patches and in being more transparent or glass like when living than any other known species of the genus. The exumbrellar nematocyst patches become indistinct in mature specimens and in those crowded in culture, with single nematocysts increasingly spaced out. The hydroid, both field-collected and raised in culture from its medusa, forms small, upright stolonal colonies not more than 1.5 mm high. The hydranths bear an oral whorl of four to five capitate tentacles, and immediately below a second whorl of slightly shorter capitate tentacles. In thriving colonies there is occasionally a whorl of small filiform tentacles on the lower part of the hydranth. Medusa buds develop in the middle of hydranth below the capitate tentacles and above the reduced filiform tentacles, if present. Young medusae are liberated with the typical 16 exumbrellar nematocyst patches. The hydroid of this species was originally mistaken for the hydroid of Polyorchis penicillatus. Brinckmann-Voss (1977) reported a small corynid hydroid living on the margin of rock scallop shells. Medusae liberated from this hydroid were at that time believed to be those of Polyorchis penicillatus (Eschscholtz) present in the plankton. Immature medusae of these two species appear strikingly similar, especially with regard to their exumbrellar nematocyst patches, four tentacles and abaxial ocelli. Since then however, this connection has been proven wrong, because an identical hydroid was raised from the medusae of the new species Sarsia bella. Second generation medusae raised in the laboratory were carefully compared with medusae liberated from field collected hydroids (thought to have been Polyorchis penicillatus), and these were found to be identical with meduse of Sarsia bella. Young medusae of P. penicillatus from the plankton can be clearly distinguished from S. bella medusae by the number of their exumbrellar nematocyst patches. Both P. penicillatus and Sarsia bella have eight adradial rows of exumbrellar nematocyst patches when young, however each row in P. penicillatus consists of at least three vertically alligned patches whereas each row never has more than two patches in S. bella. In both species the patches consist of microbasic p-mastigophores, but capsules in the case of P. penicillatus are larger than those in S. bella. Later stages of the two species are easily distinguished using other morphological characters with only four tentacles in S. bella and more than four in P. penicillatus. No hydroid of the genus Polyorchis has been described to date.No disponibl

The hydroid of Vannuccia forbesii (Anthomedusae, Tubulariidae)

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Leuckartiara acuta (Hydrozoa, Anthoathecatae, Pandeidae), a New Species from the Pacific

Leuckartiara acuta sp. nov., family Pandeidae (Anthoathecatae, Hydrozoa) has been collected during surveys of epipelagic salmon habitat in the northern Subtropical Region and the Transitional Domain of the Subarctic Region of the North Pacific. It is characterized by a tall, pointed, narrow, apical projection, four perradial tentacles and two or three tentaculae in each quadrant. Reexamination of specimens recorded from the Subtropical Region of the central North Pacific by Kramp (1965) as L. gardineri shows that these specimens also belong to the new species

Zyzzyzus rubusidaeus (Cnidaria, Hydrozoa, Tubulariidae), a new species of anthoathecate hydroid from the coast of British Columbia, Canada

Brinckmann-Voss, Anita, Calder, Dale R. (2013): Zyzzyzus rubusidaeus (Cnidaria, Hydrozoa, Tubulariidae), a new species of anthoathecate hydroid from the coast of British Columbia, Canada. Zootaxa 3666 (3): 389-397, DOI: 10.11646/zootaxa.3666.3.

Monocoryne colonialis sp nov., a colonial candelabrid hydroid (Cnidaria: Hydrozoa: Candelabridae) from the North Pacific

Monocoryne colonialis sp. nov. is described from the Aleutian Islands, Alaska. The new species is unusual among candelabrid hydroids in having a colonial growth form, differing from its congeners in the shape and size of hydranths, in having stolons that anastomose, and by having tentacles not fused or only partly fused into bract-like structures.CAPESFAPESP[06/02960-8/05821-9/60327-0]PEETUnited States National Science Foundation (NSF)[DEB-9978o86