Poricella Canu, 1904

Dick, Matthew H., Tilbrook, Kevin J. & Mawatari, Shunsuke F., 2006, Diversity and taxonomy of rocky-intertidal Bryozoa on the Island of Hawaii, USA, Journal of Natural History 40 (38 - 40), pp. 2197-2257 : 2218-2220

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
status

 

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.

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Arachnopusiidae

Loc

Poricella Canu, 1904

Dick, Matthew H., Tilbrook, Kevin J. & Mawatari, Shunsuke F. 2006
2006
Loc

Poricella spathulata:

Tilbrook KJ 2006: 113
Tilbrook KJ & Hayward PJ & Gordon DP 2001: 65
2001
Loc

Drepanophora corrugata:

Harmer SF 1957: 1080
1957
Loc

Hiantopora spathulata

Ryland JS & Hayward PJ 1992: 249
Canu F & Bassler RS 1929: 116
1929
Loc

Rhyncopora corrugata

Thornely LR 1905: 118
1905
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