Nemertesia ramosa Lamouroux 1816

• Main Author: Calder, Dale R.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Plumulariidae; Nemertesia; Nemertesia ramosa; Iceland
• Online Access: https://doi.org/10.5281/zenodo.5248544; http://treatment.plazi.org/id/03C8247ED028FFA7FF62F915FF7B2CAE

Nemertesia ramosa Lamouroux, 1816 Fig. 43 Nemertesia ramosa Lamouroux, 1816: 164.— Jägerskiöld, 1971: 63.— Cornelius, 1995b: 156. Antennularia ramosa .— Segerstedt, 1889: 20, 27.— Jäderholm, 1909: 105, pl. 12, fig. 2. Antennularia ( Nemertesia ) ramosa .— Gislén, 1930: 310. Type locality. “Océan Européen” (Lamouroux 1816: 164). Museum material. Kosterhavet, 58°52.424’N, 11°06.178’E, 35– 11 m, 06.ix.2010, biological dredge, R / V Nereus , on a pebble and unattached, several colony fragments, up to 7 cm high, with gonothecae, ROMIZ B3884. Remarks. Three species of the genus Nemertesia Lamouroux, 1812, N. antennina (Linnaeus, 1758), N. ramosa Lamouroux, 1816, and N. norvegica (G.O. Sars, 1874), have been reported from southern Scandinavia. The first two are known from western Sweden (see Checklist) and are widespread in European waters. The only record of N. norvegica from the Skagerrak-Kattegat area is that of G.O. Sars (1874), who described it from Stormeberget in the Oslofjord (Christiansen 1972). The species has been observed infrequently and is poorly known. Cornelius (1995b: 146) noted the possibility that it might be referable to Antennopsis Allman, 1877, if that genus were to be recognized as valid. Nemertesia ramosa , collected here from the Kosterhavet, is easily distinguished from N. antennina (Linnaeus 1758) in having homomeric (with all or mostly all hydrocladial internodes hydrothecate) rather than heteromeric (with hydrocladial internodes alternately hydrothecate and non-hydrothecate) hydrocladia. Nemertesia norvegica is similar, but its stems are non-canaliculate, apparently unbranched, and have four or fewer longitudinal rows of hydrocladia (Cornelius 1995b). In addition, gonothecae of N. norvegica are described by Cornelius as being in the form of a “crescent-shaped sausage” rather than “curved ovoid.” Although Nemertesia ramosa is known from southern Iceland (Schuchert 2001a), the Skagerrak presently appears to be its northern limit in continental Europe. In addition to its Atlantic distribution ...