Mucropetraliella philippinesis (Canu & Bassler, 1929)

Chae, Hyun Sook, Kil, Hyun Jong & Seo, Ji Eun, 2016, Taxonomic study on bryozoans - new additions to the Korean fauna and new species of Petraliella from Seogwipo waters of Jeju Island, Journal of Species Research 5 (3), pp. 551-565 : 563

** 57. Mucropetraliella philippinesis ( Canu and

Bassler, 1929)

ḅṵŀş‖ÑnjḇNj (신ḡ) ( Fig. 7 ) Petraliella philippinensis Canu and Bassler, 1929: 261 ;

Lu, 1991: 52. Petraliella falcifera : Canu and Bassler, 1929: 263. Mucropetraliella philippinensis : Harmer, 1957: 710; Tilbrook, 2006: 200.

Material examined. NIBRIV0000325945, Beomseom Island , 27 Aug. 2009 by SCUBA diving .

Description. Colony encrusting. Zooids convex, polygonal, longer than wide; frontal walls uniformly perforate with various pores in shape. Orifice rounded, wider than long, with a pair of lateral denticles and wide median denticle. Oral spines lacking. Three types of avicularia. A pair of lateral oral avicularia, small, rounded, with complete crossbar, directed proximally, inconspicuous. Sometimes, frontal avicularia in older zooecia, directed randomly. Large spatulate avicularium sometimes on one side of frontal wall; crossbar complete. Suboral mucro prominent, tall, bifurcated; small avicularium on top of mucro, ascending towards orifice and its end curved inwards, sometimes a few small pores at distal end of mucro. Ovicells prominent, globular, as wide as long, minutely perforate. Basal surface ( Fig. 7D ) smooth with small pores, single or two.

Remark. In Korean waters, the only species of Mucropetraliella armata mucroaviculata (Okada and Mawataria, 1938) was reported within the genus by Rho and Seo (1986) and Seo (1993; 2005). Mucropetraliella philippinensis differs from M. armata mucroaviculata in its lack of oral spines, whereas M. armata mucroaviculata has 2­5 spines.

Distribution. Korea (Jeju Island), Japan, China, Philippines, Solomon Islands.

Figures

Fig. 7. Mucropetraliella philippinensis (Canu and Bassler, 1929).A. zooids. B. orifice. C. ovicells. D. basal surface. Scale bars: 100 μm(A­D).