Bryozoa of Floridan Oculina reefs
Author
Judith L Winston
text
Zootaxa
2016
4071
1
1
81
journal article
10.11646/zootaxa.4071.1.1
8ffe5a88-06f7-44af-95aa-5fd49e0302c4
1175-5326
260490
D47C792F-E91D-40A6-ABB7-FA7810578562
Steginoporella magnilabris
(Busk, 1854)
(
Fig. 2
;
Table 1
)
Membranipora magnilabris
Busk, 1852
: vi, pl. 65, fig. 4; 1854: 62 (part), 113.
Steginoporella elegans
: Smitt, 1873: 15
, pl. 4, figs 96–101; Verrill 1900: 594.
Steganoporella magnilabris
: Harmer 1900: 279
, figs 10, 31; Osburn 1914: 196; 1940: 375; 1947: 18; Canu & Bassler 1923: 63, pl. 14, figs 12, 13; 1928a: 64, pl. 7, figs 8–10, pl. 32, fig. 6; Marcus 1955: 284, pl. 2, fig. 25; Cook 1964: 53, pl. 1, fig. 4, fig. 2; 1968: 153; 1985: 108, pl. 12 D; Long & Rucker 1970: 19, figs 2, 6; Powell 1971: 769.
Steginoporella magnilabris
: Shier 1964: 618
; Pouyet & David 1979: 784, text-fig. 2, pl. 1, figs 6–7; Winston 1984: 10, fig. 18; 2005: 29, figs 73, 75; Souza 1989: 497; Vieira
et al
. 2008: 20; Winston & Woollacott 2009: 252, fig. 11.
FIGURE 2.
Steginoporella magnilabris
(Busk, 1854)
:
A,
colony fragment with bidirectional growth;
B,
another view showing very irregular zooid shapes in zone where growth changed direction;
C,
group of zooids. Scale bars: A, C, 1 mm; B, 0.5 mm.
TABLE 1.
Measurements in mm of
Steginoporella magnilabris
(Busk, 1854)
(colony fragment with only A zooids.
|
Lz
|
Wz
|
Lo
|
Wo
|
| N |
6 |
6 |
6 |
6 |
| Mean |
0.933 |
0.573 |
0.471 |
0.384 |
| SD |
0.062 |
0.046 |
0.033 |
0.052 |
| Min |
0.864 |
0.540 |
0.432 |
0.306 |
| Max |
1.026 |
0.648 |
0.522 |
0.450 |
Material examined.
VMNH no. 70599.
Description.
Colony encrusting to foliaceous; fragment found in this study was part of erect colony that had changed growth direction (
Fig. 2
A, C). Zooids typically dimorphic, all elongate, subrectangular proximally and rounded distally, but comprising only the smaller A-zooids in sole fragment found (the less-abundant larger Bzooids known to occur between them in other material). A-zooid orifice semicircular with smoothly calcified distal rim and shelf, and two condyles. B-zooid morphology similar, but opercular region enlarged, with deeper, lunate shelf. Sunken cryptocystal shelf in proximal half of all zooids, less granular than rim and with a few small pores, forming projection that covers polypide tube; with elongate opesiular grooves on either side to allow insertion of retractor muscles.
Oculina
specimen shown here was skeletal, but when alive both A and B zooids had strongly reinforced opercula edged with acute chitinous teeth. No avicularia. Brooding internal.
Remarks.
On the basis of their unique reproductive and morphological characters, Ostrovsky (2013) created a new suborder and new superfamily Thalamoporelloidea to include the families
Thalamoporellidae
and
Steginoporellidae
. His revised classification is followed here.
Distribution.
Western Atlantic: Florida, Gulf of
Mexico
and Caribbean.
Brazil
: Abrolhos Island, Bahia, Espírito Santo and Rio de Janeiro; reported to have a broader subtropical-tropical distribution (Harmer 1900).