Halecium textum Kramp, 1911

Schuchert, Peter, 2005, Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa), Journal of Natural History 39 (8), pp. 607-639: 631-632

publication ID

http://doi.org/ 10.1080/00222930400001319

persistent identifier

http://treatment.plazi.org/id/4B6087F1-8B53-FFD1-CB94-FE8EFC55FC56

treatment provided by

Carolina

scientific name

Halecium textum Kramp, 1911
status

 

Halecium textum Kramp, 1911  

( Figure 13 View Figure 13 )

Halecium textum Kramp 1911, p 368   , Plate 21 Figures 5 View Figure 5 , 6 View Figure 6 ; Schuchert 2001, p 85, Figure 71A–G, 72A, B.

Halecium tenellum: Jäderholm 1909, p 27   , Plate 4 Figure 12 View Figure 12 ; Fraser 1944, p 201, Figure 179 [not Halecium tenellum Hincks 1861   ].

In part Halecium tenellum: Broch 1918, p 46   , Figures 20, 21; Kramp 1932, p 19; Kramp 1938, p 8; Kramp 1943, p 32.

? Halecium undulatum Billard 1922, p 137   , Figure 3 View Figure 3 .

Halecium undulatum   : in part Calder 1970, p 1510, Plate 2 Figures 5–8 View Figure 5 View Figure 6 View Figure 7 View Figure 8 , not 9 [?5 H. minutum   ]; Hamond 1957, p 304, Figures 12 View Figure 12 , 13 View Figure 13 ; Cornelius 1995, p 198, Figure 70.

Material examined

MHNG INVE 33592 and 33574 ( BIOICE collection), 65.78 ° N, 14.22 ° W, Iceland, 28–60 m, 24 July 1991 GoogleMaps   , on bryozoan and on Sertularella polyzonias   , with female gonothecae. BIOFAR station 402, 62.10 ° N, 8.14 ° W, The Faroes , 121 m, 30 May 1989 GoogleMaps   . BIOFAR station 554, 61.94 ° N, 6.50 ° W, The Faroes , 62 m, 22 September 1989 GoogleMaps   , on hydroid.

Description

Colonies reaching 2 cm in height, stems irregularly branched, polytomies frequent, branches not in one plane. Larger colonies form a tangled mass. Branches curving sharply upwards, with irregularly occurring nodes. Perisarc strongly undulated or corrugated over stretches, but smooth stretches can also occur. Hydrotheca on hydrophore of about equal length as hydrothecal depth. Hydrotheca diameter at base 0.1 mm, depth 30–50 mm, upper part distinctly everted or even rolled-in, diaphragm fine, desmocytes present. Below diaphragm frequently a pseudo-diaphragm, variable in form and position, either formed as a horizontal or oblique annular thickening or as a mere process at the origin of the apophysis. Gonothecae borne on branches, dioecious. Female gonotheca about 1 mm long, oblong, in side view only half as thick, narrow truncated end with oval aperture. Male gonotheca slightly smaller, spindle-shaped, not much flattened, shape somewhat variable, gonad fills gonotheca nearly completely (after Schuchert 2001).

Distribution

Boreal-arctic species; known from Greenland, north-eastern Canada, western and eastern Iceland, Faroes. Some records of H. undulatum   from the British Isles, the North Sea, Sweden, and Norway could also be H. textum   . Type locality: Maroussia, eastern Greenland, 160–180 m ( Kramp 1911).

Remarks

This species has recently been re-described by Schuchert (2001) and several records previously attributed to H. tenellum   or H. undulatum   could be referred to it. The newly examined material from eastern Iceland, from where it has not been recorded so far, is especially notable for the strongly corrugated perisarc ( Figure 14A, B View Figure 14 ).

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Haleciidae

Genus

Halecium

Loc

Halecium textum Kramp, 1911

Schuchert, Peter 2005
2005
Loc

Halecium undulatum

Billard 1922: 137
1922
Loc

Halecium undulatum

Billard 1922
1922
Loc

Halecium tenellum

: Broch 1918: 46
1918
Loc

Halecium textum

Kramp 1911: 368
1911
Loc

Halecium tenellum: Jäderholm 1909 , p 27

Jaderholm 1909: 27
1909
Loc

H. minutum

Broch 1903
1903
Loc

Halecium tenellum

Hincks 1861
1861