Halecium beanii ( Johnston, 1838 )

Galea, Horia R., 2007, Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile, Zootaxa 1597 (1), pp. 1-116 : 52-53

publication ID

https://doi.org/ 10.11646/zootaxa.1650.1.4

publication LSID

lsid:zoobank.org:pub:BF519BEF-877B-4DFB-A2FA-87710CC7F92B

DOI

https://doi.org/10.5281/zenodo.5098599

persistent identifier

https://treatment.plazi.org/id/7F5A8787-BF70-FFB3-FF0E-FA309958F859

treatment provided by

Felipe

scientific name

Halecium beanii ( Johnston, 1838 )
status

 

Halecium beanii ( Johnston, 1838) View in CoL View at ENA

(fig. 12A–D, table 16)

Thoa beanii Johnston, 1838: 120 , pl. 7 figs 1–2.

Halecium beani (i): Hincks, 1868: 224, pl. 34 fig 2; Hartlaub, 1905: 604, figs A 3 –B 3; Fraser, 1912: 366, fig. 27; Stechow, 1919: 33; 1923: 5; Fraser, 1944: 186, pl. 33 fig. 160; Vervoort, 1959: 224, fig. 6; Ralph, 1958: 332, fig. 10A–B, E– K; Vervoort, 1966: 103, fig. 3; Rees & Rowe, 1969: 12; Naumov, 1969: 483, fig. 336; Vervoort, 1972a: 30, figs 6–7; Leloup, 1974: 10, fig. 7; Millard, 1975: 144, fig. 47A–E; Blanco, 1976: 30, pl. 1 figs 4–7; Stepanjants, 1979: 108, pl. 16 fig. 6; Rees & Vervoort, 1987: 23, fig. 4A–B; Ramil Blanco & Iglesias Dias, 1988: 71, fig. 1; Gili et al. 1989: 77, fig. 7A; El Beshbeeshy, 1991: 29, fig. 3; Cornelius, 1995a: 276, fig. 62; Hirohito, 1995 (English text): 17, fig. 3D–F, pl. 1, fig. A; Ramil et al., 1998b: 7; Medel & Vervoort, 2000: 8, fig. 1; Schuchert, 2000: 413; 2001a: 73, fig. 59; Vervoort & Watson 2003: 86, fig. 15D–H; Bouillon et al., 2004: 139, fig. 73F–J; Schuchert, 2005: 615, figs 5–6; Vervoort, 2006: 252.

Halecium beanei: Stechow, 1919: 33 View in CoL .

Material examined. Stn. MEL 01 —08.iii.2005, 10– 15 m, S19: six stems, 3–4 cm high, some fertile, with male gonophores, 3 slides ( MHNG INVE 53173 ) .

Type locality. Near Scarborough , Yorkshire, England .

Description. Colonies 3–4 cm high, arising from encrusting hydrorhiza; stem slightly polysiphonic basally, grading to monosiphonic distally; stem markedly geniculate with short internodes delimited by transverse to slightly oblique nodes; perisarc reatively thick and slightly brown in color. Internodes with distal hydrotheca, alternately placed left and right, rim not surpassing distal node. Branches irregularly alternate, borne on short stem apophyses situated below stem hydrothecae; structure of branches similar to that of stem; perisarc of branches becoming thinner towards tips. Cauline hydrothecae with thin walls, contrasting with thick perisarc of rest of caulus. Primary hydrothecae borne on short hydrophores, held oblique to main axis of internode. Hydrotheca shallow, walls slightly diverging distally, aperture rounded, rim even, opening plane of hydrotheca inclined; desmocytes visible as numerous refringent nodules. No secondary hydrophores have been observed in present material. Male gonophores present in some colonies: club-shaped, walls nearly parallel, distal part rounded, base tapering abruptly; borne on short pedicel inserted below hydrotheca.

Remarks. Both H. beanii and H. halecinum ( Linnaeus, 1758) were reported from the Pacific (see Schuchert 2005). Vervoort & Watson (2003) pointed out that both species can be securely separated only in the presence of female gonothecae. Cornelius (1995a) showed that sterile material is still distinguishable based on the general shape of old colonies, which are regularly pinnate in H. halecinum and irregularly branched in H. beanii . However, Schuchert (2005) found some exceptions for H. halecinum , but recognized that the pinnate colony form is certainly diagnostic of this species.

The present specimens have irregularly branched colonies and fit well with the available descriptions of H. beanii ( Vervoort 1972a, Schuchert 2005). Moreover, only H. beanii has been previously reported from Chile ( Hartlaub 1905, Leloup 1974).

Hydroid epibionts. Halecium delicatulum Coughtrey, 1876 .

World distribution. Cosmopolitan, penetrating well into the Arctic Ocean and the coasts of Patagonia, but not into the Antarctic ( Medel & Vervoort, 2000).

Records from Chile. Previous records of this species are from Golfo Corcovado ( Jäderholm 1905), Canal Beagle ( Jäderholm 1910), Golfo de Ancud and Seno Reloncavi ( Leloup 1974). The present material was found at only one station, Melinka, Guaitecas Archipelago.

MHNG

Museum d'Histoire Naturelle

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Haleciidae

Genus

Halecium

Loc

Halecium beanii ( Johnston, 1838 )

Galea, Horia R. 2007
2007
Loc

Halecium beanei:

Stechow, E. 1919: 33
1919
Loc

Halecium beani

Vervoort, W. 2006: 252
Schuchert, P. 2005: 615
Bouillon, J. & Medel, M. D. & Pages, F. & Gili, J. M. & Boero, F. & Gravili, C. 2004: 139
Vervoort, W. & Watson, J. E. 2003: 86
Schuchert, P. 2001: 73
Medel, M. D. & Vervoort, W. 2000: 8
Schuchert, P. 2000: 413
Cornelius, P. F. S. 1995: 276
El Beshbeeshy, M. 1991: 29
Gili, J. M. & Vervoort, W. & Pages, F. 1989: 77
Rees, W. J. & Vervoort, W. 1987: 23
Stepanjants, S. D. 1979: 108
Blanco, O. M. 1976: 30
Millard, N. A. H. 1975: 144
Leloup, E. 1974: 10
Vervoort, W. 1972: 30
Rees, W. J. & Rowe, M. 1969: 12
Naumov, D. V. 1969: 483
Vervoort, W. 1966: 103
Vervoort, W. 1959: 224
Ralph, P. M. 1958: 332
Fraser, C. M. 1944: 186
Stechow, E. 1923: 5
Stechow, E. 1919: 33
Fraser, C. M. 1912: 366
Hartlaub, C. 1905: 604
Hincks, T. 1868: 224
1868
Loc

Thoa beanii

Johnston, G. 1838: 120
1838
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