Amphisbetia minima ( Thompson, 1879 )

Gil, Marta & Ramil, Fran, 2021, Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic), European Journal of Taxonomy 758, pp. 49-96 : 67-68

publication ID

https://doi.org/ 10.5852/ejt.2021.758.1425

publication LSID

lsid:zoobank.org:pub:7CA6D8AC-2312-47F9-8C17-528B94E4C8A7

DOI

https://doi.org/10.5281/zenodo.5088936

persistent identifier

https://treatment.plazi.org/id/EB6F5251-FFA0-FF88-ED0F-FA5A3290FB6B

treatment provided by

Felipe

scientific name

Amphisbetia minima ( Thompson, 1879 )
status

 

Amphisbetia minima ( Thompson, 1879) View in CoL

Fig. 4B View Fig ; Table 7

Sertularia minima Thompson, 1879: 104–105 View in CoL , pl. 17 fig. 3.

Amphisbetia minima View in CoL – Millard 1975: 250, fig. 82h–k. — Galea & Schories 2012: 36 View Cited Treatment , fig. 3n–o.

Material examined

SOUTH ATLANTIC OCEAN • 2 colonies, growing on algae (1 with gonothecae); Vema Seamount , stn BT5; 31°37′16″–31°36′58″ S, 8°22′37″–8°23′06″ E; 71–94 m depth; 31 Jan. 2015; SEAFO-2015 leg.; SEAFO-2015-40617 , SEAFO-2015-40768 , LZM-UV slide R. 584 GoogleMaps .

Remarks

The presence of “pores” or “holes” surrounded by a low perisarcal collar below various hydrothecae and usually located at the proximal internodes of the colonies was described by Ralph (1961), Millard (1975) and Vervoort & Watson (2003), but we have not observed any “pores” in our colonies. Nevertheless, these pores seem to be a variable feature in this species, as Vervoort & Watson (2003), after reviewing a large amount of material from New Zealand, stated that in some cases there is a pair of holes in the basalmost internode, but other colonies have a single pore or none at all. This structure has been interpreted as nematothecae ( Ralph 1961), comparable to the mamelon of Plumularidae (Millard 1975) , or glandular pores ( Vervoort & Watson 2003), but their true significance remains unknown.

Distribution

Amphisbetia minima is considered as a circumglobal species, without records from Arctic and Antarctic waters (Millard 1975; Vervoort & Watson 2003). In the South Atlantic, it was reported from Vema Seamount ( Millard 1966), the west coast of South Africa (Millard 1975) and the Tristan da Cunha group of islands ( Galea 2010, 2015). Its bathymetric distribution extends from the littoral zone to 664 m depth ( Vervoort & Watson 2003).

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Leptothecata

Family

Sertulariidae

Genus

Amphisbetia

Loc

Amphisbetia minima ( Thompson, 1879 )

Gil, Marta & Ramil, Fran 2021
2021
Loc

Amphisbetia minima

Galea H. R. & Schories D. 2012: 36
2012
Loc

Sertularia minima

Thompson d'Arcy W. 1879: 105
1879
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