Hydrozoa name details

Checked: verified by a taxonomic editorDiphasia pinastrum (Cuvier, 1830)

117882  (urn:lsid:marinespecies.org:taxname:117882)

Unaccepted: synonym, or anything that is not accepted unaccepted (questionable synonym)
Species
Checked: verified by a taxonomic editorSertularia pinaster Ellis & Solander, 1786 (invalid junior homonym of Sertularia pinaster Lepechin, 1783)
marine
Checked: verified by a taxonomic editorTaxonomy Cuviers spelling is regarded as a new name for...  
Checked: verified by a taxonomic editorTaxonomy 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.
 [details]
Schuchert, P. (2012). Diphasia pinastrum (Cuvier, 1830). In: Schuchert, P. (2017). World Hydrozoa database. Accessed at http://www.marinespecies.org/hydrozoa/aphia.php?p=taxdetails&id=117882 on 2017-12-13

Date
action
by
2004-12-21 15:54:05Z
created
2012-02-16 13:24:12Z
changed

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. 11, 261-324., available online at http://www.gulfofmaine.org/kb/files/9793/TROTT-Cobscook%20List.pdf [details]  Available for editors  PDF available 

additional source Integrated Taxonomic Information System (ITIS). , available online at http://www.itis.gov [details]   
 
 Present  Inaccurate  Introduced: alien 
 

From editor or global species database
Checked: verified by a taxonomic editorBiology colonial; fixed gonophores [details]

Checked: verified by a taxonomic editorTaxonomy 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.
 [details]
 

Sertularia pinaster from Ellis & Solander (1786)
Checked: verified by a taxonomic editor Sertularia pinaster...
[image from synonym]