Abietinaria abietina ( Linnaeus, 1758 )

Calder, Dale R., 2012, On a collection of hydroids (Cnidaria, Hydrozoa, Hydroidolina) from the west coast of Sweden, with a checklist of species from the region 3171, Zootaxa 3171 (1), pp. 1-77 : 34

Abietinaria abietina ( Linnaeus, 1758)

Fig. 32

Sertularia abietina Linnaeus, 1758: 808 .— Winther, 1880a: 250.— Segerstedt, 1889: 18, 27.— Lönnberg, 1898: 53.

Diphasia abietina .— Jäderholm, 1909: 85, pl. 8, fig. 14.

Abietinaria abietina .— Rees & Rowe, 1969: 19.— Jägerskiöld, 1971: 61.

Type locality. UK: England, south coast ( Cornelius 1979: 251) .

Museum material. Kosterhavet, 58°53.039’N, 11°05.602’E, 160– 30 m, 06.ix.2010, biological dredge, R / V Nereus , two colonies, to 7.5 cm high, without gonophores, ROMIZ B3882 .

Remarks. Abietinaria abietina ( Linnaeus, 1758) is a large and conspicuous hydroid that is widespread in the study area. Jägerskiöld (1971) reported it from 33 stations covering much of the west coast of Sweden, while Rees & Rowe (1969) noted that it is common on rocky habitats. It is also found in Denmark ( Kramp 1935b) and in the Oslofjord, Norway ( Christiansen 1972). Abietinaria filicula ( Ellis & Solander 1786) , reportedly rare in the study area ( Rees & Rowe 1969) and not nearly as well known overall ( Cornelius 1979: 254), is morphologically similar but much less robust. Other characters distinguishing it from A. abietina , according to Cornelius (1995b), are the more pronounced adcauline notch on the hydrotheca beneath the aperture and the pear-shaped instead of elongateovate gonothecae. These two have now been recognized as distinct at the molecular level ( Moura et al. 2011). The reported depth range of A. abietina in Swedish waters is 10–200 m (see Checklist).

Cornelius (1979, 1995b) provided accounts of the biology of both A. abietina and A. filicula .

Reported distribution. West coast of Sweden.—From the Koster area to the Öresund ( Jäderholm 1909).

Elsewhere.—In the northern hemisphere from polar waters to Portugal and Madeira in Europe (da Cunha 1944; Cornelius 1995b), to Nantucket Sound on the east coast of the United States ( Calder 2004), to California on the west coast of the United States ( Fraser 1948), and to Kamchatka in Asia ( Yamada 1959). Also reported from the Magellan region in the southern hemisphere ( Peña Cantero & García Carrascosa 1999).

Figures

FIGURE 32. Abietinaria abietina: part of branch with alternate to subalternate hydrothecae, ROMIZ B3882. Scale equals 0.5 mm.