Hydractinia valens Fraser, 1941b

Calder, Dale R. & Choong, Henry H. C., 2018, Names of hydroids (Cnidaria, Hydrozoa) established by Charles McLean Fraser (1872 - 1946), excluding those from Allan Hancock Expeditions, Zootaxa 4487 (1), pp. 1-83: 16

publication ID

https://doi.org/10.11646/zootaxa.4487.1.1

publication LSID

lsid:zoobank.org:pub:524B23B9-8EAA-4BD6-8937-A1B8F1C057B9

persistent identifier

http://treatment.plazi.org/id/0392282A-FFE9-FFEB-AEC1-5CF51823F97D

treatment provided by

Plazi

scientific name

Hydractinia valens Fraser, 1941b
status

 

Hydractinia valens Fraser, 1941b 

Hydractinia valens Fraser, 1941b: 79  , pl. 13, figs. 2a–e.

Holotype. USNM 43451View Materials: USA, Massachusetts, R/ V Speedwell Sta. 284, SW of Stellwagen Bank, 42°10’N, 70°22’W, 57 m, 0 4 August 1879, trawl, one colony on shell of a live gastropod, in rather poor condition, with a few gonophores, labelled “ type ”; ethanol.GoogleMaps 

Type locality. USA, Massachusetts: SW of Stellwagen Bank , 42°10’N, 70°22’W, 31 fm (57 m) ( Fraser 1941b).GoogleMaps 

Current status. Valid.

Remarks. A specimen of Hydractinia valens Fraser, 1941b  at the NMNHAbout NMNH ( USNMAbout USNM 43451) is currently listed in the online database as a syntype, although the specimen count in the online database is recorded as “1”. Fraser had designated it as the “ type.” No other specimens of the species, type or otherwise, are reported in collections at the AMNHAbout AMNH, CASAbout CAS, MCZAbout MCZ, RBCMAbout RBCM, or YPMAbout YPM. From his original description (“Colony growing from ...”), Fraser (1941b) seems to have examined a single specimen in describing the species. We therefore take the only colony of the species at the NMNHAbout NMNH ( USNMAbout USNM 43451), examined here, to be the holotype by monotypy ( ICZN Art. 73.1.2).

Hydractinia valens  , known to date solely from the brief account of Fraser (1941b), is regarded as valid ( Cairns et al. 2002; WoRMS). It apparently differs from the sympatric H. polyclina L. Agassiz, 1860  and H. symbiolongicarpus Buss & Yund, 1989  in having spines that are short and smooth rather than tall and jagged. Fraser described its gastrozooids as “large and lusty” (to 4.5 mm high), with 10 tentacles (according to Fraser 1947a, the number of tentacles is 12). Gonozooids lacked tentacles, and bore fixed sporosacs each having about six ova. Fraser did not record the substrate of the species, but the holotype is on the shell of a gastropod with the snail still inside.

NMNH

Smithsonian Institution, National Museum of Natural History

USNM

Smithsonian Institution, National Museum of Natural History

AMNH

American Museum of Natural History

CAS

California Academy of Sciences

MCZ

Museum of Comparative Zoology

RBCM

Royal British Columbia Museum

YPM

Peabody Museum of Natural History

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Anthoathecata

Family

Tubulariidae

Genus

Hydractinia

Loc

Hydractinia valens Fraser, 1941b

Calder, Dale R. & Choong, Henry H. C. 2018

2018
Loc

Hydractinia valens

: 79