Hydrozoa taxon details
Diphasia pinastrum (Cuvier, 1830)
|Classification: Biota > Animalia > Cnidaria > Hydrozoa > Hydroidolina > Leptothecata > Conica > Sertulariidae > Diphasia|
|Status||unaccepted (questionable synonym)|
|Checked by Taxonomic Editor|
|Accepted name||Diphasia margareta (Hassall, 1841)|
|Parent||Diphasia Agassiz, 1862|
Sertularia pinaster Ellis & Solander, 1786 (invalid junior homonym of Sertularia pinaster Lepechin, 1783)|
basis of record: van der Land, J.; Vervoort, W.; Cairns, S.D.; Schuchert, P. (2001). Hydrozoa, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 112-120 (look up in IMIS) [details]|
additional source: Trott, T.J. 2004. Cobscook Bay inventory: a historical checklist of marine invertebrates spanning 162 years. Northeastern Naturalist (Special Issue 2): 261 - 324. [details]
additional source: ITIS database, available online at http://www.itis.gov [details]
|Distribution||European waters (ERMS scope) [details]|
Mediterranean Sea [details]
North West Atlantic [details]
|Links||To Biodiversity Heritage Library (1 publication)|
To Encyclopedia of Life
To GenBank (3 nucleotides; 0 proteins)
Taxonomic status: Cuviers spelling is regarded as a new name for the preoccupied name Sertularia pinaster Ellis & Solander, 1786.|
There are two similar but clearly distinct and easily distinguishable Diphasia species in the NE Atlantic
Diphasia alata Hincks (1855) and
Diphasia margareta (Hassal, 1841).
The situation of Diphasia pinastrum (Cuvier, 1830) [= S. pinaster Ellis & Solander, 1786] is debatable.
Although Ellis & Solander (1786) depict hydrothecae with a sharp kink - typical for D. alata - two other details strongly argue in favour that Ellis and Solander had rather Diphasia margareta and not D. alata:
- the gonothecae are much too big for D. alata: the latter species as very small gonothecae (max 0.7 mm), not much larger than the hydrotheca. This is well illustrated in Hincks (1868: pl 48 fig. 2a) and has been checked for several other samples. The gonothecae of D. margareta are 2- 4 mm in length (comp. data in Cornelius 1979)
- the spacing of the hydrothecal pairs is too wide for D. alata: the latter species has a very tight spacing of the hydrothecal pairs, while they are much wider spaced in D. margareta.
Cornelius (1995b: 35) has concluded otherwise, but he was perhaps mislead by the schematic drawings of the hydrothecae in Ellis & Solander (1786).
For the sake of nomenclatural stability, it is thus best to continue the use as given in Cornelius (1995b) and use the names Diphasia alata Hincks (1855) and Diphasia margareta (Hassal, 1841), while Sertularia pinaster Ellis & Solander, 1786 should be regarded as a questionable synonym of Diphasia margareta.
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|Citation: Schuchert, P. (2013). Diphasia pinastrum (Cuvier, 1830). In: Schuchert, P. (2013) World Hydrozoa database. Accessed through: Schuchert, P. (2013) World Hydrozoa database at http://www.marinespecies.org/hydrozoa/aphia.php?p=taxdetails&id=117882 on 2013-05-20|