Halecium petrosum Stechow, 1919

Schuchert, Peter, 2005, Taxonomic revision and systematic notes on some Halecium species (Cnidaria, Hydrozoa), Journal of Natural History 39 (8), pp. 607-639: 621-622

publication ID

http://doi.org/ 10.1080/00222930400001319

persistent identifier

http://treatment.plazi.org/id/4B6087F1-8B45-FFDB-CBFC-FEAEFF15F932

treatment provided by

Carolina

scientific name

Halecium petrosum Stechow, 1919
status

 

Halecium petrosum Stechow, 1919  

( Figure 8 View Figure 8 )

Halecium robustum: Motz-Kossowska 1911, p 346   , Figure 14 View Figure 14 ; Neppi 1921, p 13, Figures 4 View Figure 4 , 5 View Figure 5 .

[Not Halecium robustum Pieper 1884, p 166   .]

Halecium petrosum Stechow 1919, p 36   , new name; Coma et al. 1992, p 162, Figure 1A View Figure 1 ; Peña Cantero and García Carrascosa 2002, p 69, Figure 14 View Figure 14 a–c.

Material examined

MHNG INVE 26665, Anse de Troc , Banyuls-sur-Mer Pyrénées Orientales, France, 2 m, coll. P. Schuchert, 23 June 1997, fertile female   . MHNG INVE 29763, Spain, Mallorca , Cala Murada, coll. P. Schuchert, 23 August 2000, 0.5 m, on rock and red algae, shows signs of multiple re-growth and regenerations, identification not entirely secure   .

Description

Colonies erect, branched, shoots 5–15 mm, monosiphonic, composed of main axis and shorter side-branches. Erect parts segmented by alternately oblique nodes; nodes distinct, internodes about 0.5–0.6 mm long, diameter 80–90 mm. Perisarc smooth. Side-branches originate from hydrophores. Hydrotheca near segment end, on very short hydrophore; hydrotheca does not reach beyond level of node. Primary hydrotheca with straight or slightly curved walls, basal diameter 0.10–0.12 mm, depth 20–30 mm, desmocytes present. Hydrophore without pseudodiaphragm. Secondary hydrotheca on corrugated hydrophore of variable length, several times longer than primary hydrophore. Gonothecae on main stem. Female gonotheca 0.6–0.7 mm long and about 0.5 mm broad, main body ovoid, bilaterally symmetric through a lateral hydrotheca that overtops gonotheca body, with crease-line running from hydrotheca along gonotheca body. Male gonothecae without hydrotheca, club-shaped, slightly curved or not, length 0.5–0.55 mm.

Additional information

Stems may reach 3 cm in height. Female gonotheca with two hydranths ( Motz-Kossowska 1911).

Biology

Depth range 1–200 m, grows on a variety of solid substrata. Fertile colonies observed from June to October ( Peña Cantero and García Carrascosa 2002). Ecological aspects were investigated by Coma et al. (1992).

Distribution

Mediterranean. Type localities: Cap Béar and Cap Abeille near Banyuls-sur-Mer, France, Mediterranean   .

Remarks

Motz-Kossowska (1911) identified abundant material from Banyuls as Halecium robustum Pieper, 1884   . The latter name was recognized by Bedot (1912, p 14) as a synonym of H. lankesterii   (see also Hamond 1957 for more invalid homonyms of Halecium robustum   ). Because Motz-Kossowska’s material had female gonothecae that differed from typical H. lankesterii, Stechow (1919)   attributed it to a new species with the name Halecium petrosum   (compare Figures 8F View Figure 8 and 7E View Figure 7 ). Also the trophosomes of Halecium lankesterii   and H. petrosum   are quite distinct (compare Figures 7B View Figure 7 and 8B View Figure 8 , and remarks under H. lankesterii   ).

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Haleciidae

Genus

Halecium

Loc

Halecium petrosum Stechow, 1919

Schuchert, Peter 2005
2005
Loc

Halecium petrosum

Stechow 1919: 36
1919
Loc

Halecium robustum:

Motz-Kossowska 1911: 346
1911
Loc

Halecium robustum

Pieper 1884: 166
1884