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
Plesiocleidochasma cleidostomum
(Smitt, 1873)
comb. nov.
(
Fig. 35
;
Table 34
)
Lepralia cleidostoma
Smitt, 1873: 62
, pl. 11, figs 217–219.
Lepralia porcellana
: Osburn 1914: 209
.
Hippoporina cleidostoma
: Canu & Bassler 1928a: 104
, pl. 9, fig. 7, pl. 32, fig. 6, text-fig. 18.
Hippoporina porcellana
: Osburn 1940: 428
; Shier 1964: 633.
Cleidochasma porcellanum
: Cheetham & Sandberg 1964: 1032
, text-fig. 35; Long & Rucker 1970: 19, fig. 4.2; Winston 1982: 147, fig. 80.
Schedocleidochasma porcellanum
: Winston 2005: 87
, figs 244–246.
TABLE 34.
Measurements in mm of
Plesiocleidochasma cleidostomum
(Smitt, 1873)
.
|
Lz
|
Wz
|
Lo
|
Wo
|
Lov
|
Wov
|
Lav
|
Wav
|
| N |
18 |
18 |
18 |
18 |
12 |
12 |
1 |
1 |
| Mean |
0.428 |
0.321 |
0.124 |
0.095 |
0.182 |
0.240 |
0.126 |
0.054 |
| SD |
0.043 |
0.031 |
0.009 |
0.011 |
0.021 |
0.019 |
------ |
------ |
| Min |
0.360 |
0.288 |
0.108 |
0.081 |
0.144 |
0.148 |
0.126 |
0.054 |
| Max |
0.522 |
0.396 |
0.144 |
0.126 |
0.216 |
0.270 |
0.126 |
0.054 |
Material examined.
MCZ # 90,
syntype
of
Lepralia cleidostoma
,
May 1, 1868
, Cast No. 7, 26 fms [off Sombrero Key], L. Pourtales; VMNH no. 70652, 70653, 70654; USNM no. 1283259.
Description.
Colonies encrusting, in unilaminar patches to multilaminar mounds. Primary layer of zooids regularly hexagonal; frontally budded zooids irregularly polygonal. Frontal shield smooth to sparsely granular, flat over most of frontal surface (
Fig. 35
B), raised around orifice, imperforate except for a few marginal pores. Orifice cleithridiate, rounded distally with proximally directed condyles, and narrow U-shaped sinus. Single or paired adventitious avicularia may occur on umbo proximolateral to orifice; rostra and mandibles acutely triangular (
Fig. 35
C). Ovicell hyperstomial, prominent and delicately striated when newly formed, becoming granular and embedded in secondary calcification with age; imperforate, with frontal area in form of a thin curved-edged plate (labellum) between two lateral slits, leaving narrowly transverse opening (
Fig. 35
A, B). Embryos reddish-pink.
Discussion
. Floridan
Plesiocleidochasma cleidostomum
is part of the ‘
Cleidochasma porcellanum
’ species complex, widely distributed in tropical and subtropical habitats, including the Western Atlantic (see Winston 2005).
Soule, Soule & Chaney (1991) and Cook & Bock (1996) revised the genera and species included in the
Cleidochasmatidae
. Winston (2005) placed Smitt’s species in
Schedocleidochasma
, but Berning (2012) recently synonymized
Schedocleidochasma
under
Plesiocleidochasma
, a decision followed here.
Distribution
. Cape Hatteras to Florida, Caribbean, and Gulf of
Mexico
.