Synthecium gracile Fraser, 1937b

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: 49-50

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-FFD6-FFD5-AEC1-59C019FEFB2A

treatment provided by

Plazi

scientific name

Synthecium gracile Fraser, 1937b
status

 

Synthecium gracile Fraser, 1937b 

? Sertularella cylindrica var. pusilla Ritchie, 1910: 817  , pl. 77, fig. 9.

Cyclonia gracilis Stechow, 1921b: 230  .

? Hincksella cylindrica Blackburn, 1937: 173  , fig. 2.

Synthecium gracile Fraser, 1937b: 2  , pl. 1, fig. 2 [invalid junior primary homonym of Synthecium gracile Coughtrey, 1875  ]. Hincksella gracilis  .— Vervoort & Watson, 2003: 245.

? Hincksella pusilla  .— Vervoort & Watson, 2003: 245.

Holotype. USNM 43286View Materials: Puerto Rico, N of Salinas Point, Johnson-Smithsonian Deep-Sea Expedition Sta. 26, 18°30’30”N, 66°23’05”W, 0 7 February 1933, 60– 73 m, R/ V Caroline, one colony on a hydroid stem, ca. 6 mm high, in fair condition, without gonophores, coll. Paul Bartsch, labelled “ type ”; ethanol.GoogleMaps 

Paratype. BCPMAbout BCPM 976-00962-001: Puerto Rico, north coast, Johnson Hydro Sta. 26 (Johnson-Smithsonian Deep-Sea Expedition Sta. 26), 0 7 February 1933, one colony overgrowing another hydroid, in poor condition, without gonothecae, labelled “co-type”; dry sometime in the past, 60% IPAAbout IPA.

Type locality. Puerto Rico: 18°30’30”N, 66°23’05”W, 33–40 fm (60–73 m) ( Bartsch 1933, Sta. 26; Fraser 1937b).

Current status. Invalid.

Remarks. Synthecium gracile  was described by Fraser (1937b) from a specimen collected during the Johnson- Smithsonian Deep-Sea Expedition. The single colony at the NMNHAbout NMNH ( USNMAbout USNM 43286) was designated by him as the holotype, although it is currently listed as a syntype in the NMNHAbout NMNH online database. Material in the Fraser Hydroid Collection at the RBCMAbout RBCM ( BCPMAbout BCPM 976-00962-001), from the same location and labelled “co-type”, constitutes a paratype. Another specimen of S. gracile  at the RBCMAbout RBCM ( BCPMAbout BCPM 976-00963-001: slide), collected from “Cerros Island” (Cedros Island, Mexico) during the Allan Hancock Pacific Expeditions ( Fraser 1938a), is not type material.

The nomenclature of S. gracile Fraser, 1937b  is fraught with homonymy. The name is a junior primary homonym of S. gracile Coughtrey, 1875  (established as S. gracilis  , but corrected to S. gracile  by Thompson 1879). Homonymy no longer exists between the two names because S. gracile Fraser  is now assigned to Hincksella Billard, 1918  , while S. gracile Coughtrey  is referred to Amphisbetia L. Agassiz, 1862  . However, the name of Fraser’s species then becomes a junior secondary homonym of Hincksella gracilis ( Stechow, 1921b)  (originally Cyclonia gracilis  ).

Vervoort & Watson (2003: 245) considered Fraser’s hydroid to be a briefly described and poorly illustrated species of doubtful identity, likely conspecific with Hincksella pusilla ( Ritchie, 1910)  from the Mergui Archipelago, Indian Ocean. It is listed by WoRMS as a synonym of H. cylindrica ( Bale, 1888)  , in common with Vervoort (1968), Calder (1991), and others. However, Galea & Ferry (2015) presented evidence that H. cylindrica  is a species restricted to Australia, and concluded that the species of warm waters in the western Atlantic (including Cyclonia gracilis Stechow, 1921b  ) is identical with H. pusilla  . With Fraser’s species currently held to be a probable synonym (for a recent synonymy list, see Galea 2010), it seems unnecessary to provide a replacement name for it here.

BCPM

British Columbia Provincial Museum

IPA

Empresa Pernambucana de Pesquisa Agropecu�ria, IPA

NMNH

Smithsonian Institution, National Museum of Natural History

USNM

Smithsonian Institution, National Museum of Natural History

RBCM

Royal British Columbia Museum

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Syntheciidae

Genus

Synthecium

Loc

Synthecium gracile Fraser, 1937b

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

2018
Loc

Sertularella cylindrica var. pusilla

Ritchie, 1910 : 817

Loc

Cyclonia gracilis

Stechow, 1921b : 230

Loc

Hincksella cylindrica

Blackburn, 1937 : 173

Loc

Synthecium gracile

Fraser, 1937b : 2 Vervoort & Watson, 2003 : 245

Loc

Hincksella pusilla

Vervoort & Watson, 2003 : 245