Poricella Canu, 1904
publication ID |
https://doi.org/ 10.1080/00222930601062771 |
persistent identifier |
https://treatment.plazi.org/id/3C0487C6-FFA6-9421-BAB4-C46CFB3A3880 |
treatment provided by |
Felipe |
scientific name |
Poricella Canu, 1904 |
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Genus Poricella Canu, 1904 View in CoL
Poricella spathulata ( Canu and Bassler, 1929) View in CoL
( Figure 7E, F View Figure 7 )
Hiantopora spathulata Canu and Bassler 1929, p 116 , Plate 11, Figures 13 View Figure 13 , 14 View Figure 14 . Tremogasterina spathulata: Ryland and Hayward 1992, p 249 , Figure 13e View Figure 13 .
Poricella spathulata: Tilbrook et al. 2001, p 65 View in CoL , Figure 10B View Figure 10 ; Tilbrook 2006, p 113, Figure 16B View Figure 16 .
Measurements
ZL, 0.45–0.65 (0.538¡0.055). ZW, 0.26–0.48 (0.350¡0.062). OrL, 0.13–0.15 (0.140¡0.006). OrW, 0.12–0.14 (0.129¡0.007). OvL, 0.16–0.24 (0.208¡0.031). OvW, 0.23–0.30 (0.260¡0.033) (ovicell n 55).
Description
Colony unilaminar, encrusting, white, small. Frontal wall convex, with minute marginal pores and with 7–10 large, crescentic pores ( Figure 7E View Figure 7 ) in centre, each surrounded by a broad rim, giving the frontal a tessellated appearance. Orifice longer than broad, proximal margin straight, poster about one-third of orifice length and delineated by small lateral condyles; proximal to orifice is a thick crescentic ridge, rising to an umbo or sharp point. Scattered between zooids are large avicularia ( Figure 7E View Figure 7 ), budded distolaterally from zooids, with a truncate-spatulate rostrum and mandible of the same shape. Large, vicarious avicularia have been reported in this species ( Cook 1977; Tilbrook et al. 2001) but we did not observe them in the specimens from Hawaii. Ovicell ( Figure 7E View Figure 7 ) raised, globose, imperforate, the surface rugose but with irregular smooth areas. Marginal zooids with four distal spines. Ancestrula ( Figure 7F View Figure 7 ) tatiform, with 11 spines.
Remarks
This was one of the two dominant bryozoan species at Kealakekua Bay. The other, Hippopodina iririkiensis , grew predominantly on coral rubble, whereas P. spathulata was found exclusively in the surface cavities of porous lava boulders.
Distribution
Widely distributed in Indo-West Pacific, from Red Sea to Philippines; Great Barrier Reef, Australia; Mauritius; Vanuatu (for references, see synonymies). This is the first record for the Hawaiian Islands.
Superfamily LEPRALIELLOIDEA Vigneaux, 1949
Family LEPRALIELLIDAE Vigneaux, 1949
Genus Drepanophora Harmer, 1957
Drepanophora corrugata ( Thornely, 1905)
( Figure 8A, B View Figure 8 )
Rhyncopora corrugata Thornely 1905, p 118 , Figure 5 View Figure 5 .
Drepanophora corrugata: Harmer 1957, p 1080 , Plate 70, Figures 29–31; Hayward 1988,
p 338, Plate 14c, d.
Measurements ZL, 0.48–0.65 (0.538¡0.066). ZW, 0.28–0.46 (0.369¡0.055). OrL, 0.09–0.14
(0.112¡0.013). OrW, 0.13–0.16 (0.151¡0.008).
Description
Two small colonies adjacent to one another, lacking ovicells, the larger 3.5 mm in diameter, were found on lava rock. Colony encrusting, multiserial, unilaminar at first but becoming multilaminar by frontal budding. Zooids in primary layer irregularly hexagonal, oval, or barrel-shaped, separated by a deep groove; in secondary layer, zooids haphazardly orientated and zooidal boundaries indistinct. Frontal wall ( Figure 8A View Figure 8 ) well calcified, markedly convex, inflated; imperforate except for two to four round areolar pores well spaced along each lateral margin; rugose with uniform, low, rounded tubercles. Primary orifice transversely elliptical, the proximal margin typically with a pair of long, prominent, acute lateral condylar processes, with a similarly long and acute denticle between them ( Figure 8B View Figure 8 ), often offset to a greater or lesser extent to one side or the other; there is considerable variation in the arrangement of these three orificial processes. In older zooids, primary orifice lies deep in peristome, difficult to observe. Peristome a thick, raised rim, highest proximally; discontinuous, with a deep, more or less circular sinus flanked by the avicularian rostrum near the midline and a sharp, coarse, conical peristomial process lower down arising from the margin of the peristome. Suboral avicularian chamber umbonate; avicularian rostrum offset slightly from midline, oval in outline, angled acutely from the frontal plane, facing laterally, cross bar complete; mandible semicircular, directed obliquely upward from plane of colony surface. Secondary orifice, including the peristomial sinus, longer than broad, irregularly pyriform due to the sinus. Spines lacking. Ovicell not observed in our material, but Harmer (1957) illustrated it has hyperstomial, globose, with a pair of large foramina.
Distribution
Originally described from Ceylon ( Thornely 1905); also reported from Indonesia ( Harmer 1957) and Mauritius ( Hayward 1988). This is the first record for the Hawaiian Islands.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Poricella Canu, 1904
Dick, Matthew H., Tilbrook, Kevin J. & Mawatari, Shunsuke F. 2006 |
Poricella spathulata:
Tilbrook KJ 2006: 113 |
Tilbrook KJ & Hayward PJ & Gordon DP 2001: 65 |
Drepanophora corrugata:
Harmer SF 1957: 1080 |
Hiantopora spathulata
Ryland JS & Hayward PJ 1992: 249 |
Canu F & Bassler RS 1929: 116 |
Rhyncopora corrugata
Thornely LR 1905: 118 |