Hydrozoans

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: A hydroid colony living on a riser at the Heather Alpha platform in the North Sea Item Type: Image Title: Colony of hydroids in the North Sea Species: Tubularia larynx Behaviour: Living on riser Site: Atlantic -- North SeaNorth Sea Site Description: Seafloor Depth (m): approx 40 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

Millepora alcicornia.

Tubularia Couthonyi.

Tubularia indivisa.

Perigonimus jonesii Osborn & Hargitt.

Obelia diaphana.

Liriope cerasiformis.

Adult Nanomia cara.

Clytia bicophora.

Figure 28.Stylaster repandus, A–K, M holotype (male), USNM 1122740, L female paratype, USNM 1122739: A–C cyclosystems and coenosteal papillae D gastrostyle and robust dactylostyle E stereo view of a cyclosystem F–G coenosteal texture H stereo view of a gastrostyle and adjacent dactylostyle I stereo view of plate cross section showing some gastrostyles and male ampulla J a robust dactylostyle K elements of a dactylostyle L cross section of a female ampulla M cross section of a male ampulla.

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: Hydroid Corymorpha glacialis These hydroids are large and conspicuous with one whorl of over 40 long tentacles with inner rings of blastostyles with reproductive spheres (gonophores) and short, ventral oral tentacles. The orange oblong object is an amphipod, potentially living associated with this Corymorpha individual. Item Type: Image Copyright: SERPENT project Species: Corymorpha glacialis Site: Atlantic -- Norwegian -- Dalsnuten Site Description: Seafloor Depth (m): 1452 Latitude: 66 deg 34' 33" N Longitude: 3 deg 32' 46" E Countries: Norway -- Norwegian Sector Habitat: Benthic Rig: Aker Barents Project Partners: Shell, Aker Drilling, Oceaneering ROV: Magnum 142 Deposited By: Miss Moira MacLean Deposited On: 23 February 2011