On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region

Abstract

An account is given of 48 species identified in a small collection of hydroids from the west coast of Sweden. Assigned to39 genera and 18 families, most are well-known from boreal waters of the North Atlantic Ocean. Campanulina paniculaG.O. Sars, 1874 is referred to Racemoramus, a new genus of leptothecates distinguished in part by having monopodialgrowth, rigid and non-segmented hydrocauli, and grape-like clusters of hydrothecae that arise at irregular intervals fromthe stem. The name Sertularia dumosa (now Lafoea dumosa) is taken to have been made available by Fleming (1820), notFleming (1828). As such, it is not threatened by a virtually unused subjective synonym (Lafoea cornuta Lamouroux,1821). Aselomaris michaeli Berrill, 1948 and Rhizorhagium navis Millard, 1959 are regarded as synonyms and combinedunder the binomen Pachycordyle michaeli (Berrill, 1948). Confusion in the literature over the identity of Sertularia teneraG.O. Sars, 1874 is addressed, and distinctive characters of the species are discussed. A species often misidentified as S.tenera is assigned to Sertularia spitzbergensis (Jäderholm, 1909); the name spitzbergensis is elevated in rank from sub-specific to specific, and assigned priority over its simultaneous synonym siberica Jäderholm, 1909 under the First ReviserPrinciple. Gonothecae of Clytia gigantea (Hincks, 1866) (type locality: Lamlash Bay, UK) are reported for the first timein material from Europe. Although much like Clytia hemisphaerica, this species is retained as valid due to its remarkablyrobust colony form, elongate and gradually tapered hydrothecae, and linguiform rather than wavy or pointed marginalcusps. Eudendrium album Nutting, 1896, Pachycordyle michaeli (Berrill, 1948), and the hydroid stage of Halitholus cir-ratus Hartlaub, 1913 are reported for the first time from the study area. A checklist of hydroids from the study area is included.

Fieldable Environmental DNA Sequencing to Assess Jellyfish Biodiversity in Nearshore Waters of the Florida Keys, United States

“…Despite the difficulty in visually identifying medusozoans that lack a pelagic swimming stage, our seawater eDNA analysis proved to be effective for detecting several species of hydroids and staurozoans (stalked jellyfish) lacking a swimming medusa stage. Although no single literature source exists that comprehensively documents the jellyfish fauna of Florida and the Caribbean, the results of our comparative evaluation of jellyfish biodiversity in these coastal habitats were generally consistent with the literature on medusozoans present in the region (Conant, 1897;Bigelow, 1900Bigelow, , 1918Bigelow, , 1938Mayer, 1910;Kramp, 1961;Vervoort, 1967;Larson, 1976;Humann and Deloach, 2002;Holland et al, 2004;Calder, 2009Calder, , 2013Orellana and Collins, 2011;Lasley et al, 2016;Cunha et al, 2017;Mendoza-Becerril et al, 2017;Miglietta et al, 2018;Miranda et al, 2018;Ohdera et al, 2018;NOAA, 2020) (summarized herein in Figure 7). Due to the large amount of sequence data generated, we were able to filter reads stringently and still recover a great deal of medusozoan biodiversity as a proof-ofconcept that eDNA metabarcoding with FeDS identified higher overall biodiversity than could be detected with traditional survey methods alone, validating its utility for field applications.…”

Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)

“…Despite the fact that this species is currently included in the synonymy of Clytia hemisphaerica (Linnaeus, 1767) (Schuchert 2020), we agree with Calder (2012) who considers C. gigantea as a valid species, due to the comparatively larger size of its hydrothecae, provided with linguiform cusps, an opinion that was also later shared by Peña Cantero & Horton (2017). Moreover, Ramil (1988), in his study of the hydroids of Galicia (NW Spain), described this species as Clytia sp., apart from C. hemisphaerica, based on the same features highlighted by Calder (2012). Therefore, considering that both morphological features and measurements of our colonies coincide with those given by Ramil (1988), Calder (2012 and Peña Cantero & Horton (2017), we identify this material as C. gigantea.…”

“…Campanulina denticulata was considered a synonym of Earleria panicula (G.O. Sars, 1874) by several authors (Leloup 1974;Schuchert 2003), but Calder (2012 suggested that the Atlantic E. panicula is a different species from the Indo-Pacific C. denticulata. The comparison of the material from the Valdivia Seamount with colonies of E. panicula collected in NW Africa showed some morphological differences, and agrees with descriptions of C. denticulata given by Clarke (1907) and Vervoort (1966).…”

“…Campanulina denticulata has an Indo-Pacific distribution (Calder 2012). Its bathymetric distribution extends from more than 500 m (Clarke 1970, as Opercularella denticulata) to 4040 m deep (Vervoort 1966, as O. denticulata).…”

Biogeographic and faunistic division of the Eurasian Polar Ocean based on distributions of Hydrozoa (Cnidaria)

“…All collections, together with all relative literature data, were critically checked and revised. In addition to data from my own work (Antsulevich, 1987, 1991, 2006, 2008, 2009), additional faunistic data on Hydrozoa were extracted from numerous other publications, the most important being those of Broch (1910), Fraser (1937), Yamada (1959), Naumov (1960), Calder (1970, 1972, 2012), Stepanjants (1989), Svoboda & Cornelius (1991), Cornelius (1995), Schuchert (2001, 2012), Bouillon et al (2004), Vervoort & Faasse (2009), and Altuna et al (2013).…”