Agalma clausi (Bedot, 1888)

Mańko, Maciej K. & Pugh, Philip R., 2018, Agalma clausi (Bedot, 1888) (Siphonophora: Physonectae) - complementary description with notes on species distribution and ecology, Zootaxa 4441 (2), pp. 311-331: 315-316

publication ID

https://doi.org/10.11646/zootaxa.4441.2.7

publication LSID

lsid:zoobank.org:pub:1F81A5B9-5FCB-43F4-B85B-5398AB16E09E

persistent identifier

http://treatment.plazi.org/id/583E5976-4E20-DE61-32CD-8BDEFD250449

treatment provided by

Plazi

scientific name

Agalma clausi (Bedot, 1888)
status

 

Agalma clausi (Bedot, 1888) 

Synonyms.

Agalma sarsii ( Fewkes, 1880)  p. 628.

Crystallodes Clausi  (Bedot, 1888, post-scriptum) p. 20.

Stephanopsis Clausi ( Bedot, 1896)  p. 406.

Stephanomia sarsii ( Schneider, 1898)  p. 121–122.

? Agalma eschscholtzii (Haeckel, 1888)  p. 226 and Plate XVIII, Fig. 8–17View FIGURE 8View FIGURE 9View FIGURE 10View FIGURE 11View FIGURE 12View FIGURE 13View FIGURE 14View FIGURE 15View FIGURE 16View FIGURE 17.

? Agalma haeckeli ( Bigelow, 1911)  p. 274–277.

Systematics. Agalma clausi  belongs to the Family Agalmatidae Brandt, 1834  that is nested within the historically recognized Physonectae, a suborder that groups all siphonophores sharing particular body plan i.e., possessing pneumatophore, nectosome, and siphosome. However, Physonectae were shown to be polyphyletic (Dunn et al. 2005) and following the most recent phylogeny ( Munro et al. 2018) agalmatid siphonophores are placed within a newly erected, monophyletic clade Euphysonectae. Although this phylogenetic hypothesis is well supported, as the International Commission on Zoological Nomenclature ( ICZN 1999) does not recognise clades we decided to maintain the name Physonectae throughout this text.

Type specimens. There is no known type specimen, thus we designate the specimen from BWP Dive 1044-15 as a neotype. It will be deposited at the United States National Museum ( Smithsonian Institution ), Washington, DC under accession number USNM 1422474View Materials  . It was collected close to the surface by a SCUBA diver on 14th July, 1983 at 3°56.9'N, 37°15.8'W.

Diagnosis. Rigid-stemmed, monoecious agalmatid siphonophore of prismatic appearance, with nectophores arranged biserially and some bracts showing carmine pigmetation in living animal. Nectophores with short axial wings and size-dependent ridge pattern, incomplete laterals discernible only in younger zooids, but upper and lower lateral ridges present throughout development, but very weak in largest nectophores. No vertical lateral ridges. Thrust block small on mature nectophores; lateral ostial processes also small and packed with nematocysts. Typical Agalma  course of lateral radial canals. Cormidia bearing gastrozooids (often flask-shaped), with tentacle, several gonophores of both sexes, bracts and palpons. Involucrum of tentillum voluminous, able to contain the cnidoband, the two terminal filaments and the central ampulla. Palpacle of palpon originates not at its base but, on the fully mature palpon, almost at its mid-length. Six types of bracts, of which one is able to discharge a coloured, probably fluorescent, fluid when stimulated.

Kingdom

Animalia

Phylum

Cnidaria

Class

Hydrozoa

Order

Siphonophorae

Family

Agalmatidae

Genus

Agalma

Loc

Agalma clausi (Bedot, 1888)

Mańko, Maciej K. & Pugh, Philip R. 2018

2018
Loc

Agalma haeckeli (

Bigelow 1911

1911
Loc

Stephanomia sarsii (

Schneider 1898

1898
Loc

Stephanopsis Clausi ( Bedot, 1896 )

Clausi (Bedot 1896

1896
Loc

Agalma eschscholtzii

Haeckel 1888

1888
Loc

Agalma sarsii (

Fewkes 1880

1880
Loc

Agalmatidae

Brandt 1834

1834