Actinopluma Galea

Galea, Horia R. & Maggioni, Davide, 2020, Plumularioid hydroids (Cnidaria: Hydrozoa) from off New Caledonia collected during KANACONO and KANADEEP expeditions of the French Tropical Deep-Sea Benthos Program, European Journal of Taxonomy 708, pp. 1-58: 8

publication ID

https://doi.org/10.5852/ejt.2020.708

publication LSID

lsid:zoobank.org:pub:DDF28821-1A4A-4457-BB53-1696F3BFB7B2

DOI

http://doi.org/10.5281/zenodo.4335878

persistent identifier

http://treatment.plazi.org/id/5CD7421D-F5D7-4AE5-8CC7-4C13AAD95F1D

taxon LSID

lsid:zoobank.org:act:5CD7421D-F5D7-4AE5-8CC7-4C13AAD95F1D

treatment provided by

Valdenar

scientific name

Actinopluma Galea
status

gen. nov.

Genus Actinopluma Galea   gen. nov.

urn:lsid:zoobank.org:act:5CD7421D-F5D7-4AE5-8CC7-4C13AAD95F1D

Type species

Actinopluma mirifica Galea   gen. et sp. nov., designated herein (see below).

Diagnosis

Hydroids with upright, rigid, coplanar colonies with sparingly-branched stem; stem and branches fascicled. Main tube of the stem undivided, but equivalents of internodes with a lateral apophysis and a number of nematothecae above; apophyses alternate, coplanar, each with a mamelon, continued directly into a main hydrocladium; two accessory cladia, projecting outward and slightly upward, are given off laterally from below both sides of the mamelon; main hydrocladium divided into internodes with hydro- and nematothecae; accessory cladia shorter and thinner than main counterpart, generally composed of nematothecae-bearing internodes, occasionally with 1–2 intervening hydrothecate internodes distally. Hydrothecae cup-shaped, without associated nematothecae. Gonothecae unknown.

Etymology

From Ancient Greek ‘ ἀΚτίς ’, meaning ‘ray’, and Latin ‘ plūma ’, meaning ‘plume’, to describe the radiate appearance of this new hydroid genus. The gender is feminine.

Remarks

Based on morphological grounds alone, the absence of lateral nematothecae flanking the hydrotheca place this genus in the family Kirchenpaueriidae Stechow, 1921   . This allocation should be regarded as provisional, pending the collection of additional material suitable for molecular studies, expected to clarify unambiguously its systematic position.

In having hydrocladia provided with two accessory appendages, the colonies of this so far monotypic genus somehow resemble macroscopically Oswaldella Stechow, 1919   , but in the latter, the hydrocladia branch dichotomously at the level of the proximalmost internode, the original cladium not extending beyond this internode ( Peña Cantero et al. 1997).