Streptocaulus gracilis 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: 63-64

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-FFD8-FFDB-AEC1-59141D80FCB2

treatment provided by

Plazi

scientific name

Streptocaulus gracilis Fraser, 1937b
status

 

Streptocaulus gracilis Fraser, 1937b 

Streptocaulus gracilis Fraser, 1937b: 6  , pl. 2, fig. 10.

Holotype. USNM 43293View Materials: Puerto Rico, off northeast coast, 18°30’20”N, 65°57’00”W, Johnson-Smithsonian Deep- Sea Expedition Sta. 9, 0 1 February 1933, 240–280 fm (439–512 m), R/ V Caroline, one colony, ca. 9 cm high, in fairly good condition, without gonophores, collGoogleMaps  . Paul Bartsch, labelled “ type ” and “ holotype ”; ethanol. 

Schizoholotype. BCPM 976-00946-001, Puerto Rico, one colony fragment, 1.3 cm high, in good condition, without gonophores; slide (slide is broken lateral to mount).

Type locality. Puerto Rico: off northeast coast, 18°30’20”N, 65°57’00”W, 240–280 fm (439–512 m) (Johnson- Smithsonian Deep-Sea Expedition Sta. 9; Bartsch, 1933).GoogleMaps 

Current status. Valid.

Remarks. The name-bearing type of Streptocaulus gracilis  ( USNMAbout USNM 43293), designated by Fraser (1937b) as a holotype, is listed in the NMNHAbout NMNH database as a syntype. Examination of the type material confirms the existence of a single specimen, i.e., the holotype.

The single location record of the species as cited in Fraser’s original account, from the slope north of Puerto Rico (18°33’15”N, 65°56’45”W, 240 fathoms), does not match that of type material (USNM 43293) in the current online database record of the NMNH (syntype, N of St. Thomas, U.S. Virgin Islands, centroid latitude 18.5583, longitude -65, Johnson-Smithsonian Deep-Sea Expedition Sta. 98, 549 m). Neither of these locations appears to be correct. A label in the vial with the holotype specimen indicates that it was collected at Johnson-Smithsonian Deep- Sea Expedition Station 9, not Station 98. According to Bartsch (1933), Stn 9 was occupied at 18°30’20”N, 65°57’00”W, 240–280 fm (439–512 m) on 0 1 February 1933. He reported that at Station 98, sampling gear did not touch bottom and only pelagic animals were collected. A slide of S. gracilis  exists in the RBCM (BCPM 976- 00946-001), but no collection data are provided with it. The species was not listed in Arai (1977). Collection data recorded above correspond with those of Station 9 in Bartsch (1933).

Streptocaulus gracilis  , held to be valid in WoRMS, was described from a single specimen. Its trophosome was said by Fraser (1937b) to be a “Colony 8 cm in height…”, and the record in the NMNHAbout NMNH database ( USNMAbout USNM 43293) lists a specimen count of “1.” That specimen is the holotype, and material on a slide at the RBCMAbout RBCM ( BCPMAbout BCPM 976- 00946-001) represents a fragment of the holotype (i.e., a schizoholotype).

Ramil & Vervoort (1992: 175) suggested that Streptocaulus gracilis  may be referable to family Plumulariidae  rather than Aglaopheniidae  based on trophosomal morphology. If so, it warrants assignment to a genus other than the aglaopheniid taxon Streptocaulus Allman, 1883  . The gonosome of S. gracilis  is unknown.

USNM

Smithsonian Institution, National Museum of Natural History

NMNH

Smithsonian Institution, National Museum of Natural History

RBCM

Royal British Columbia Museum

BCPM

British Columbia Provincial Museum

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Aglaopheniidae

Genus

Streptocaulus

Loc

Streptocaulus gracilis Fraser, 1937b

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

2018
Loc

Streptocaulus gracilis

Fraser, 1937b : 6