Steginoporella perplexa Livingstone, 1929

Gordon, Dennis P., Voje, Kjetil L. & Taylor, Paul D., 2017, Living and fossil Steginoporellidae (Bryozoa: Cheilostomata) from New Zealand, Zootaxa 4350 (2), pp. 345-362 : 351

publication ID

https://doi.org/ 10.11646/zootaxa.4350.2.9

publication LSID

lsid:zoobank.org:pub:CB65B034-1CFD-475B-B4FE-1BCF7F0A388D

DOI

https://doi.org/10.5281/zenodo.6042318

persistent identifier

https://treatment.plazi.org/id/027D87EB-FFF9-2607-FCC1-D0AEDE38F813

treatment provided by

Plazi

scientific name

Steginoporella perplexa Livingstone, 1929
status

 

Steginoporella perplexa Livingstone, 1929

( Figs 1C View FIGURE 1 , 4 View FIGURES 2 – 5 , 30 View FIGURES 28 – 36 )

Steginoporella neozelanica var. perplexa Livingstone, 1929: 67 , text-fig. 2d, pl. 1, figs 8, 13. Steginoporella perplexa: Pouyet & David 1979a: 569 , fig. 3B (part), 571, fig. 4C; Pouyet & David 1979b: 789; Gordon et al. 2009: 274 (fig. D), 290.

Material examined. NIWA 76404, Stn Z15617 View Materials ; NIWA 101450, Stn Z15929 View Materials ; NIWA 122670, Stn Z8662. Plus unregistered (non-separated) specimens in multispecies samples from NIWA Stations D896, Z8662, Z9671, Z9672, Z9673, Z9677, Z9678, Z9679, Z9680, Z9681, Z9686, Z9687, Z9688, Z9689, Z9896, Z9698, Z9700, Z9701, Z9702, Z9703, Z9707, Z9708, Z9710, Z9715, Z15617 View Materials , Z15929 View Materials , Z15935 View Materials .

Diagnosis. Colony erect, large, planar, bilamellar and flabellate with undissected margin, up to 125 mm high and wide, attached to sediment grains and very small shells by basal tangle of rootlets. Colour in life pale brown. Zooids monomorphic, roundly subhexagonal but longer than wide (mean L/W = 1.81), widest at level of opercular pivots or median process. Cryptocyst occupying about half length of frontal surface, shelf depressed, flat, densely pseudoporous. Opercular opening delimited proximally by triangular opercular pivots and median process, with distolateral ‘wings’ that do not meet pivots or lateral margin; proximomedial foramen of moderate size, generally roundly quadrate, sometimes roundly triangular. Opercular sclerites reticulate, defining mostly 21–22 (sometimes fewer) areas of variable size. Thickness of sclerites may increase with age of zooid. Polypide, ancestrula and early astogeny not seen.

Measurements. In micrometres: ZL 1054±26, 1017–1100 (1, 10); ZW 582±19, 556–623 (1, 10); OpL 346±28, 300–383 (1, 10); OpW 474±37, 399–522 (1, 10).

Remarks. This is the largest species of Steginoporella in New Zealand and its fan-shaped colonies are highly distinctive. It is restricted to a small geographical area at the far north of North Island. Although locally common, its limited distribution to sandy bottoms where the scallop Pecten novaezelandiae Reeve is found makes it vulnerable to scallop dredging ( Cryer et al. 2000).

Older parts of large colonies are an important substratum for a number of species of epizoic cheilostome and cyclostome bryozoans.

Distribution. Endemic to northern New Zealand: Three Kings Shelf in vicinity of Three Kings Islands, Cape Reinga and Spirits Bay; 30– 119 m.

NIWA

National Institute of Water and Atmospheric Research

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomata

Family

Steginoporellidae

Genus

Steginoporella

Loc

Steginoporella perplexa Livingstone, 1929

Gordon, Dennis P., Voje, Kjetil L. & Taylor, Paul D. 2017
2017
Loc

Steginoporella neozelanica var. perplexa

Gordon 2009: 274
Pouyet 1979: 569
Pouyet 1979: 789
Livingstone 1929: 67
1929
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF