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
Rosulapelta floridana
(Smitt, 1873)
comb. nov.
(
Fig. 19
;
Table 18
)
Cribrilina figularis
var.
floridana
Smitt, 1873: 23
(part), pl. 5, fig. 111.
Cribrilina floridana
: Osburn 1914: 195
.
Puellina floridana
: Canu & Bassler 1928a: 74
, pl. 14, figs 3, 5–7 (not fig. 4, redrawn from Smitt’s fig. 112), text-fig. 11B.
Pelmatopora
(sensu lato)
apsata
Shier, 1964: 626, fig. 8.
Reginella floridana
: Cheetham & Sandberg 1964: 1026
, text-fig. 25; Winston 1982: 134, fig. 59; Winston 2005: 38, figs 98– 100.
Material examined.
VMNH no. 70628, 70629; USNM no. 1283245.
Description.
Colony encrusting calcareous substrata. Zooids irregularly oval with a frontal shield made up of 5–7 pairs of radially arranged costae, with rows of relatively large lumen pores separating them; costae with hollow tubules that give colony a prickly appearance. Orifice semicircular, with 2 erect, bifid or trifid distal spines and 2 fused flattened lateral spines that arch over it. Proximal edge of orifice hidden by scalloped rim formed by wide, flattened, medially fused first pair of costae. No avicularia. Ovicell unknown.
TABLE 18.
Measurements in mm of
Rosulapelta floridana
(Smitt, 1873)
.
|
Lz
|
Wz
|
Lo
|
Wo
|
| N |
18 |
18 |
18 |
18 |
| Mean |
0.504 |
0.355 |
0.074 |
0.109 |
| SD |
0.034 |
0.024 |
0.009 |
0.011 |
| Min |
0.450 |
0.324 |
0.054 |
0.090 |
| Max |
0.576 |
0.396 |
0.090 |
0.126 |
Remarks.
Smitt (1873, figs 111, 112) illustrated two colonies that he named
Cribrilina figularis
var.
floridana
; only his fig. 111, based on a colony on a piece of shell from 29 fathoms, pertains to
Reginella floridana
of later authors (see Winston 2005). Cook (1985) described a similar species,
Reginella
aff.
floridana
, from
Ghana
, but the specimen illustrated had a larger number of costae and lacked the fused lateral-oral spines characteristic of Floridan material. As Cook (1985) suggested,
R. floridana
may be a species complex. No ovicells have ever been found in either Ghanaian or western Atlantic material, and it seems likely that brooding is internal. The Floridan species seems related to
Rosulapelta repangulata
(Winston & Håkansson, 1986)
and
Rosulapelta rosetta
Winston & Vieira, 2013
. In both of these species the costal area is smaller than in
R. floridana
and
R. repangulata
has a visible ooecium. Notwithstanding,
R. floridana
is closer in overall morphology to
Rosulapelta
than to either
Reginella
or
Puellina
.
R. floridana
also seems to be closely related to
Spiniflabellum spinosum
(Canu & Bassler, 1928)
, with which it shares the lack of an externally visible ooecium, but in
Spiniflabellum
(Di Martino & Rosso, 2015)
, the costal shield, with tubular pelmatidia on the costae, is more prominent.
Distribution.
Cape Hatteras to
Tortugas
and Gulf of
Mexico
.