Celleporina nordenskjoldi ( Kluge, 1929 )

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 : 1138-1139

Celleporina nordenskjoldi ( Kluge, 1929)

( Figure 37 )

Cellepora nordenskjoldi Kluge 1929, p 22 .

Cellepora nordenskjoldi: Kluge 1962, p 552 , Figure 386; 1975, p 672, Figure 386; Androsova 1958, p 179, Figure 109; Mawatari and Mawatari 1981b, p 56.

Costazia nordenskjoldi: Osburn 1952, p 508 , Plate 63, Figures 6 , 7 .

Celleporina nordenskjoldi: Morris 1979, p 478 , Text figures 1, 3b, Table 1; Gontar 1980, p 14; Kubanin 1997, p 125.

Celleporina nordenskjoldii [sic]: Grischenko 1997, p 190; 2004, p 41.

Material examined

DIN, four colonies (NHM 2006.2.27.99) and another four colonies (NHM 2006.2.27.101), all detached from ctenostome bryozoan Flustrellidra filispina , six colonies detached from hydroid stolon (NHM 2006.2.27.100). Additional material: 41 specimens.

Description

Colony pisiform or ovoid in shape, with multilayered arrangement of zooids, one over the other; up to 9 mm in diameter, orange when alive. Colony surface irregular, undulating, with numerous knob-like lobes. Zooids ( Figure 37A, B ) cylindrical, erect, 0.29–0.36 mm across (0.32¡ 0.02 mm), with haphazard orientation. Frontal wall arched, smooth, with marginal areolar pores; pore openings carried around orifice and encircling it. Primary orifice ( Figure 37A ) irregularly oval, 0.12–0.18 mm long (0.15¡ 0.01 mm), 0.12–0.15 mm wide (0.13¡ 0.01 mm), with flattened condyles and rather shallow, broadly V-shaped proximal sinus; located deep within peristome. Peristome ( Figure 37B, C ) consists of peristomial lip proximally and paired avicularian columns laterally that are long, stout, straight or only slightly curved inward, often becoming submerged with age; rostrum terminal, oval, slightly angled to plane of orifice, cross-bar complete, semicircular mandible directed distolaterally. Vicarious avicularia ( Figure 37C, D ) rare, scattered over colony surface, up to about 0.5 mm long, with complete cross-bar, mandible broadly spatulate, rostral opesia large. Ovicell ( Figure 37B, C ) globose, broader than long, 0.22–0.25 mm long (0.24¡ 0.01 mm), 0.25–0.30 mm wide (0.28¡ 0.02 mm), initially prominent, subimmersed with age. Tabula relatively large, semicircular to transversely oval, bordered with radially arranged slit-like pores, its diameter nearly as wide as proximal margin of ovicell. Ancestrula and early astogeny not observed.

Distribution

Celleporina nordenskjoldi is distributed along the Eurasian and American sectors of the Arctic region and extends into the Boreal Pacific, but appears to be absent in the Canadian Arctic and northern Atlantic. It has been reported along the Eurasian Arctic in the Laptev, East- Siberian, Chukchi Seas ( Kluge 1962, 1975; Gontar and Denisenko 1989), and from the Beaufort Sea near Point Barrow, Alaska ( Osburn 1952; Morris 1979). In the northwestern Pacific, C. nordenskjoldi has been recorded from eastern Kamchatka, the Commander Islands, the Kuril Islands, the Shantar Archipelago, Sakhalin Island, Primorye, Peter the Great Gulf ( Kluge 1961; Gontar 1980; Kubanin 1997; Grischenko 1997), and Akkeshi and Muroran along the Pacific coast of Hokkaido, Japan ( Mawatari and Mawatari 1981b).

Figures

Figure 6. Conopeum nakanosum n. sp. (A, F) NHM 2006.2.27.26; (B, D) NHM 2006.2.27.27; (C, E) NHM 2006.2.27.25; (G, H) NHM 2006.2.27.28. (A) Colony margin with differentiating zooids, bleached; (B) zooids with developing angular cone-shaped kenozooids, bleached; (C) mature zooids with erect and curved spines, unbleached; (D) group of mature zooids with granulated cryptocyst, bleached; (E) distally facing triangular avicularia replacing kenozooids, unbleached; (F) distal view of kenozooids, bleached; (G) lateral view of zooids showing multiporous septula, bleached; (H) interior of distal zooidal wall showing developing angular kenozooids and also multiporous septula, bleached. Scale bars: 0.5 mm (A, G); 1 mm (B–D); 0.2 mm (E, F, H).

Figure 7. Callopora craticula (Alder, 1856). NHM 2006.2.27.29. (A) General view of colony fragment, unbleached; (B) immature zooids near colony margin, unbleached; (C) mature zooids showing ovicells and associated avicularia, unbleached; (D) group of immature zooids and vicarious avicularium on right, unbleached. Scale bars: 0.5 mm (A); 0.2 mm (B–D).

Figure 37. Celleporina nordenskjoldi (Kluge, 1929). (A) NHM 2006.2.27.101; (B, D) NHM 2006.2.27.99; (C) NHM 2006.2.27.100. (A) Immature zooids, showing form of primary orifice; (B) zooids with developing and completed ovicells; (C) three ovicellate zooids and vicarious avicularium; (D) two large vicarious avicularia surrounded by zooids with developing ovicells. Scale bars: 0.5 mm.