Names of hydroids (Cnidaria, Hydrozoa) established by Charles McLean Fraser (1872 - 1946), excluding those from Allan Hancock Expeditions
Author
Calder, Dale R.
Author
Choong, Henry H. C.
text
Zootaxa
2018
2018-10-02
4487
1
1
83
journal article
29136
10.11646/zootaxa.4487.1.1
939f52d6-d58b-4a22-8aec-dd5c6a591067
1175-5326
1456161
524B23B9-8EAA-4BD6-8937-A1B8F1C057B9
Streptocaulus gracilis
Fraser, 1937b
Streptocaulus gracilis
Fraser, 1937b
: 6
, pl. 2, fig. 10.
Holotype
.
USNM 43293
:
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, coll
.
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
).
Current status.
Valid.
Remarks.
The name-bearing
type
of
Streptocaulus gracilis
(USNM 43293), designated by
Fraser (1937b)
as a
holotype
, is listed in the 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 NMNH database (USNM 43293) lists a specimen count of “1.” That specimen is the
holotype
, and material on a slide at the RBCM (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.