Hydrozoans

Clytia bicophora Ag..

Figure 12.Holotype of Errinopora dichotoma, USNM 1123508: A branch cross section B colony surface showing gastro– and dactylopores C dactylopore with dactylostyle (upper) and secondary gastropore (lower) D gastropore E, J gastrostyles F–I coenosteal texture K gastrostyle spines L–M dactylostyle.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

Description: Identified by Peter Schuchert. Identifying the two specimens was initially rather difficult. Both polyps, but especially the larger 008#4, has a polyp body which shows some bilateral features, viz the outline seen from below is kidney shaped. This is otherwise typical for the related genus Branchiocerianthus. However, other diagnostic features of the genus Branchiocerianthus are absent: branched blastostyles (stalks bearing the gonads), blastostyles arranged in a horseshoe- shape, shorter tentacles on one side of the hydranth. So, I think that the kidney-shaped bodies are a result of the large size. Note that the polyp body is bent to one side in order to bring the tentacle crown to an almost vertical position, one side of the body and the lower tentacles are thus pressed against the stem. With age, these might therefore be modified Besides the body form, only the size deviates from existing descriptions of this species. In the original description of Sars, he gives a size of maximal 5 inches, which is not so much different from the present specimens. Likely only specimen 008#4 is larger than 5 inches. The size of animals I have seen so far was 4-5 cm. Anyway, I will mention these two specimens as deep water forms of C. glacialis (normal occurrence is 20-220 m). Corymorpha glacialis is a rather rare species and only a handful of specimens have been seen so far. Item Type: Image Title: Hydroid Corymorpha glacialis Copyright: SERPENT project Species: Corymorpha glacialis Site: Atlantic -- North Sea -- West of Shetland -- TornadoNorth Sea -- West of Shetland -- Tornado Site Description: Seafloor Depth (m): 1050 Latitude: 60 deg 33' 44" N Longitude: 4 deg 27' 23" W Countries: UK -- West of Shetland Habitat: benthic Rig: Stena Carron Project Partners: OMV, Oceaneering, Stena ROV: Magnum 156 Deposited By: Dr Daniel Jones Deposited On: 23 December 2009

Description: Hydroid colony living on a riser at the Heather Alpha platform in the North Sea Item Type: Image Title: Hydroid colony in the North Sea Species: Tubularia indivisa Behaviour: Living on riser Site: Atlantic -- North SeaNorth Sea Site Description: Seafloor Depth (m): 100 Countries: UK -- North Sea Habitat: Temperate Rig: Heather Alpha Project Partners: Rovtech, Lundin Petroleum, iicorr Deposited By: Rob Curry Deposited On: 24 May 2007

Davenport, California, USA

Tubularia spectabilis (Ag.) A.Gnophore containing an actinule.

Tubularia couthanyi A.Sessile medusa.

Sertularella rugosa (Linn.).

Allopora oculina, Eurenberg.

Obelia commissuralis McCr..

Stomotoca apicata, male (After Mayer).

Eutima mira.

Clytia bicophora.

Figure 27.Color figures of skeleton of various Alaskan stylasterids: A–C Stylaster repandus D–G Stylantheca papillosa H–I Crypthelia trophostega: A–B lateral and apical views of holotype, USNM 1122740 C small paratype colony, USNM 1122741 D holotype of Allopora papillosa, USNM 6852 E encrusting colony, AB02–0005 F syntype of Allopora petrograpta, USNM 43272 G holotype of Stylaster porphyrea, USNM 43018 H holotype, USNM 42876 I arborescent colony, USNM 1122435.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.

All Biocode files are based on field identifications to the best of the researcher’s ability at the time.