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A review of the physonect siphonophore genera Halistemma (Family Agalmatidae) and Stephanomia (Family Stephanomiidae)

A review of the physonect siphonophore genera Halistemma (Family Agalmatidae) and Stephanomia (Family Stephanomiidae)
A review of the physonect siphonophore genera Halistemma (Family Agalmatidae) and Stephanomia (Family Stephanomiidae)
Re-descriptions are given for all the known species in the siphonophore physonect genera Halistemma (Family Agalma-tidae) and Stephanomia (Family Stephanomiidae fam. nov.) based almost entirely on specimens collected by submersibles or ROVs. A new Halistemma species, H. maculatum
sp. nov., is also described. Until now two of the Halistemma species were known only from incomplete specimens, such that for one, H. cupulifera Lens & van Riemsdijk, only the tentilla had been described, while for the other, H. striata Totton, only the nectophores were known. The species Stephanomia amphytridis Lesueur & Petit, originally established on the basis of only an illustration of part of the siphosome, is poorly known and several descriptions in the past have been based on further siphosomal material that actually belonged to a species of
Halistemma. A specimen of that species, which included the nectosome, was recently described by Mapstone (2004) as H. amphytridis , but Pugh (2006) considered that it actually belonged to H. foliacea Quoy & Gaimard. That specimen has been re-examined for this study. The taxonomic position of the two genera is discussed. Although only distantly related the species of the two genera have a post-larval form referred to as the Nectalia stage. Haeckel (1888b) originally described a specimen at this stage as a separate species, Nectalia loligo. Nectalia stage specimens of two Halistemma species and of S. amphytridis were present in the material and their relationship with Haeckel's specimen is discussed.
1175-5334
1-111
Pugh, P.R.
ebe0c478-2183-48ab-94c2-fd78e90d0aa6
Baxter, E.J.
f6d9776c-fb5c-43ab-ac64-d1174afcd11a
Pugh, P.R.
ebe0c478-2183-48ab-94c2-fd78e90d0aa6
Baxter, E.J.
f6d9776c-fb5c-43ab-ac64-d1174afcd11a

Pugh, P.R. and Baxter, E.J. (2014) A review of the physonect siphonophore genera Halistemma (Family Agalmatidae) and Stephanomia (Family Stephanomiidae). Zootaxa, 3897 (1), 1-111. (doi:10.11646/zootaxa.3897.1.1).

Record type: Article

Abstract

Re-descriptions are given for all the known species in the siphonophore physonect genera Halistemma (Family Agalma-tidae) and Stephanomia (Family Stephanomiidae fam. nov.) based almost entirely on specimens collected by submersibles or ROVs. A new Halistemma species, H. maculatum
sp. nov., is also described. Until now two of the Halistemma species were known only from incomplete specimens, such that for one, H. cupulifera Lens & van Riemsdijk, only the tentilla had been described, while for the other, H. striata Totton, only the nectophores were known. The species Stephanomia amphytridis Lesueur & Petit, originally established on the basis of only an illustration of part of the siphosome, is poorly known and several descriptions in the past have been based on further siphosomal material that actually belonged to a species of
Halistemma. A specimen of that species, which included the nectosome, was recently described by Mapstone (2004) as H. amphytridis , but Pugh (2006) considered that it actually belonged to H. foliacea Quoy & Gaimard. That specimen has been re-examined for this study. The taxonomic position of the two genera is discussed. Although only distantly related the species of the two genera have a post-larval form referred to as the Nectalia stage. Haeckel (1888b) originally described a specimen at this stage as a separate species, Nectalia loligo. Nectalia stage specimens of two Halistemma species and of S. amphytridis were present in the material and their relationship with Haeckel's specimen is discussed.

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Published date: 2014
Organisations: Marine Biogeochemistry

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Local EPrints ID: 373984
URI: http://eprints.soton.ac.uk/id/eprint/373984
ISSN: 1175-5334
PURE UUID: 01d6fb14-9fe8-4e0e-92c5-68757d9d34c5

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Date deposited: 30 Jan 2015 16:37
Last modified: 14 Mar 2024 19:00

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Contributors

Author: P.R. Pugh
Author: E.J. Baxter

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