Celleporina porosissima Harmer, 1957

Grischenko, Andrei V., Dick, Matthew H. & Mawatari, Shunsuke F., 2007, Diversity and taxonomy of intertidal Bryozoa (Cheilostomata) at Akkeshi Bay, Hokkaido, Japan, Journal of Natural History 41 (17 - 20), pp. 1047-1161 : 1140-1142

publication ID

https://doi.org/ 10.1080/00222930701391773

persistent identifier

https://treatment.plazi.org/id/877A7251-CC16-DE57-FE41-25F1D2A51CC5

treatment provided by

Felipe

scientific name

Celleporina porosissima Harmer, 1957
status

 

Celleporina porosissima Harmer, 1957 View in CoL

( Figure 38 View Figure 38 )

Celleporina porosissima Harmer 1957, p 906 View in CoL , Plate 62, Figures 3 View Figure 3 , 16 View Figure 16 , 17 View Figure 17 .

Celleporina porosissima: Voigt and Cook 1983, p 53 View in CoL , Plates 1–3; Ikezawa and Mawatari 1993, p 1031, Figure 2A–L View Figure 2 .

? Myriozoum marionense var. irregulatum Okada 1923, p 231 , Figures 27–31 View Figure 27 View Figure 28 View Figure 29 View Figure 30 View Figure 31 .

? Myriozoum marionensis irregulatum: Okada 1934, p 19 ; Okada and Mawatari 1935, p 142, Plate 10, Figure 5 View Figure 5 .

Material examined

ACT, four colonies detached from undetermined red algal rhizoid (NHM 2006.2.27.102).

Description

Colony encrusting, discoid, domed; a typical colony measured 1.5 by 1.2 by 0.2 cm; with multilayered arrangement of zooids, one over the other; light orange when alive. Colony surface undulating, with many knob-like lobes. Zooids at colony margin ( Figure 38A View Figure 38 ) decumbent. As colony rises from substrate, zooids ( Figure 38B View Figure 38 ) become erect, cylindrical, 0.28–0.38 mm across (0.33¡ 0.03 mm), haphazardly orientated. All zooids have numerous spinous processes within the zooidal cavity ( Figure 38A, B View Figure 38 ). Frontal wall of decumbent zooids smooth, convex, with a few marginal pores and imperforate central area; in erect zooids, pores carried towards orifice by tubular extensions and form ring around peristome. Primary orifice ( Figure 38B View Figure 38 ) oval, 0.12–0.18 mm long (0.15¡ 0.01 mm), 0.11–0.16 mm wide (0.14¡ 0.01 mm), submerged with age by peristome, with flattened condyles on condylar shelves and deep, U-shaped proximal sinus. Orifice of non-ovicellate zooids encircled by narrow peristomial lip; peristome enclosed by thickened proximal orificial lip and columnar lateral orificial avicularia, one on each side lateral to orifice, rarely single or absent; avicularian column stout, curved inward, often submerged with age; rostrum circular, terminal, angled almost perpendicular to orificial plane, with a complete cross-bar; semicircular mandible directed in a lateral direction. Vicarious avicularia ( Figure 38D View Figure 38 ) scattered over colony surface, numerous in central colony region, 0.13–0.29 mm long, with spatulate mandible; cross-bar complete, rostral opesia large, sometimes with extensive palatal shelf and high rostral rim. Ovicell ( Figure 38C, D View Figure 38 ) globose, 0.24–0.33 mm long (0.29¡ 0.02 mm), 0.29–0.39 mm wide (0.34¡ 0.03 mm), initially prominent, subimmersed with age; tabula semicircular, crescentic, or triangular, extensive, occupying nearly entire frontal surface of ovicell, bordered with radially arranged slit-like pores; secondary calcification results in a distinct border surrounding tabula. Ancestrula and early astogeny not observed.

Remarks

Okada (1923) was apparently the first person to collect this species, but described his material from the Korea Strait as a new variety, irregulatum, of Myriozoum marionense Busk, 1884 . Harmer (1957) recognized Okada’s form as different from M. marionense , and on the basis of specimens from Japan described it as a new Celleporina . A key diagnostic character is the common occurrence in young zooids of several rows of pores distal to the orifice, which was well illustrated by Ikezawa and Mawatari (1993, Figure 2A, C View Figure 2 ) in their redescription of C. porosissima ; these authors also described the early astogeny. The deepwater specimens described by Okada (1923) formed colonies with erect, cylindrical, anastomosing branches, whereas Harmer (1957) described colonies as ‘‘small pleurilaminar crusts’’, and Ikezawa and Mawatari (1993) described them as ‘‘encrusting, discoidal, domed’’. Although Harmer (1957) attributed this difference in growth form to his specimens possibly having been in an initial stage of growth, the difference raises the question whether Celleporinna porosissima is indeed synonymous with Okada’s (1923) Myriozoum marionense var. irregulatum .

Distribution

Originally collected from depths of 90–200 m in the Korea Strait (if Harmer’s 1957 synonymy is valid), this species has been reported from the vicinity of Shimoda, Shizuoka Prefecture as colonies attached to seaweeds ( Okada 1934), and from Oshoro Bay,

Hokkaido, as colonies on fronds of Laminaria religiosa ( Ikezawa and Mawatari 1993) . Akkeshi Bay is the northernmost known locality .

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Celleporidae

Genus

Celleporina

Loc

Celleporina porosissima Harmer, 1957

Grischenko, Andrei V., Dick, Matthew H. & Mawatari, Shunsuke F. 2007
2007
Loc

Celleporina porosissima:

Ikezawa H & Mawatari SF 1993: 1031
Voigt E & Cook PL 1983: 53
1983
Loc

Celleporina porosissima

Harmer SF 1957: 906
1957
Loc

Myriozoum marionensis irregulatum:

Okada Y & Mawatari S 1935: 142
Okada Y 1934: 19
1934
Loc

Myriozoum marionense var. irregulatum

Okada Y 1923: 231
1923
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