Antarctothoa buskiana ( Hutton, 1873 )

Gordon, Dennis P., 2020, New Hippothoidae (Bryozoa) from Australasia, Zootaxa 4750 (4), pp. 451-476 : 471-472

publication ID

https://doi.org/ 10.11646/zootaxa.4750.4.1

publication LSID

lsid:zoobank.org:pub:AE9FDD46-5471-44B3-97FB-11C4BD45C59B

DOI

https://doi.org/10.5281/zenodo.3717940

persistent identifier

https://treatment.plazi.org/id/6262878C-FFFB-FFF8-FF3E-FAC7A344FEF6

treatment provided by

Plazi

scientific name

Antarctothoa buskiana ( Hutton, 1873 )
status

 

Antarctothoa buskiana ( Hutton, 1873) View in CoL

( Fig. 11 View FIGURE 11 A–C)

Diachoris buskiana Hutton, 1873: 94 ; Hutton 1880: 188; Jelly 1889: 228.

Schizoporella hyalina: Hutton 1891: 106 ; Hutton 1904: 297. Non Cellepora hyalina Linnaeus, 1767 View in CoL .

Celleporella buskiana: Gordon et al. 2009: 291 View in CoL .

Material examined. OM A88.104 (lectotype) ; NMNZ Pz. 4 (syntype) . NIWA 98922 View Materials , 35.8270° S, 174.5224° E, 0 m, coll. D.P. Gordon GoogleMaps ; NIWA 127918 View Materials , Stn Z9714, 34.3910° S, 172.9690° E 45 m. GoogleMaps

Remarks. This little-known epialgal species is notable for its disjunct zooids ( Fig. 11A View FIGURE 11 ), reflected in the original attribution to the unrelated genus Diachoris [i.e. Beania ]. In this regard it superficially resembles Antarctothoa discreta ( Busk, 1854) from the Falkland Islands, but the latter species has distinctive annular transverse ridges. Disjunction in A. buskiana autozooids occurs from the inception of the colony. The ancestrula has a pair of large distolateral pore-chambers that bud the first daughter zooids. These do not touch but, while they are forming, produce a median zooid between them that is not in contact with the ancestrula ( Fig. 11C View FIGURE 11 ). The three daughter zooids are disjunct and connected by tubes.

Almost all zooids are relatively long and tapering, especially the female zooids (cystids), which have the profile of an ice-cream cone. Male zooids are narrower still. Where transverse clusters of female zooids occur together in the colony, disjunctions between them, and between adjacent other zooids, are much less apparent. The autozooidal sinus is evenly U-shaped (i.e. parallel-sided), as is the tiny sinus in the dimorphic combined maternal aperture; the sinus of the male orifice, on the other hand, is proportionally long and narrow ( Fig. 11B View FIGURE 11 ).

Brown (1952) noted that, in 1874, Hutton sent a collection of New Zealand bryozoans to the then British Museum. Among them was a specimen of Diachoris buskiana , which was subsequently registered as 1875.1.5.78.

Antarctothoa buskiana is commonly distributed on thin-bladed brown-algal laminae along the northeast coast of North Island from Coromandel Peninsula to the Spirits Bay region from the low intertidal to 45 m depth.

OM

Otago Museum

NMNZ

Museum of New Zealand Te Papa Tongarewa

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Hippothoidae

Genus

Antarctothoa

Loc

Antarctothoa buskiana ( Hutton, 1873 )

Gordon, Dennis P. 2020
2020
Loc

Celleporella buskiana:

Gordon, D. P. & Taylor, P. D. & Bigey, F. P. 2009: 291
2009
Loc

Schizoporella hyalina:

Hutton, F. W. 1904: 297
Hutton, F. W. 1891: 106
1891
Loc

Diachoris buskiana

Jelly, E. C. 1889: 228
Hutton, F. W. 1880: 188
Hutton, F. W. 1873: 94
1873
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