Halicreas minimum, from NOAA Office of Ocean Exploration and Research.Belongs within: Medusozoa. The Trachymedusae are a group of hydrozoans lacking a polyp stage to the life cycle. Medusae develop directly from an actinula (Petersen 1979). <==Trachymedusae DB07 |  i. s.: Carmaris glitschi H04 |         Carmarina hastata H04 |         Aglantha B26 |           |–A. digitale C02 |           `–A.… Continue reading Trachymedusae


Limnocnida tanganyicae, from Parker (1907).Belongs within: Medusozoa. The Limnomedusae are a poorly defined group of hydrozoans with a biphasic life cycle whose medusae have ecto-endodermal statocysts and/or gametogenic tissue along their radial canals, and polyps not covered by a theca (Daly et al. 2007). <==Limnomedusae [Limnohydrina] DB07 |–Vallentinia Browne 1902 P79 |–Monobrachium Mereschkowsky 1877 P79… Continue reading Limnomedusae


Eudendrium racemosum, copyright Peter Schuchert.Belongs within: Medusozoa. Contains: Hydractinioidea. The Filifera are a group of hydrozoans characterised by the possession of filiform tentacles on the feeding polyps, together with desmoneme and eurytele nematocysts (Daly et al. 2007). <==Filifera |–Eudendriidae [Eudendriida, Eudendrioidea] P79 |    |–Myrionema Pictet 1893 P79 |    |    `–M. amboinense T87 |    `–Eudendrium Ehrenberg 1834 P79 |         |–E.… Continue reading Filifera

Lifestyles of the Rosalinidae

Among the modern foraminiferans, one of the most prominent radiations is among members of the Rotaliida, characterised by globose chambers and calcareous, hyaline test walls. Among the numerous families making up the Rotaliida are members of the Rosalinidae. Benthic form of Rosalina globularis, from Brady (1884). Rosalinids may be regarded as fairly typical-looking marine rotaliids… Continue reading Lifestyles of the Rosalinidae