Amphisbetia minima (Thompson 1879)
- Dataset
- Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic)
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Cnidaria
- class
- Hydrozoa
- order
- Leptothecata
- family
- Sertulariidae
- genus
- Amphisbetia
- species
- Amphisbetia minima
description
Fig. 4 B; Table 7
discussion
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
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).
materials_examined
Material examined SOUTH ATLANTIC OCEAN • 2 colonies, growing on algae (1 with gonothecae); Vema Seamount, stn BT 5; 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.
Name
- Synonyms
- Sertularia minima Thompson 1879
- Homonyms
- Amphisbetia minima (Thompson 1879)