Sixteen new generic records of Korean Bryozoa from southern coastal waters and Jeju Island, East China Sea: evidence of tropical affinities Author Yang, Ho Jin Author Seo, Ji Eun Author Gordon, Dennis P. text Zootaxa 2018 4422 4 493 518 journal article 30030 10.11646/zootaxa.4422.4.3 d2c5d8c4-d2e2-44a7-add4-3a94812d2581 1175-5326 1253219 45E16185-7EE6-4768-88DF-6ACA1D29DCE4 Calloporina hayamiae Arakawa, 1995 (Figs 26, 27) Calloporina sculpta : Nishizawa 1990 : 119 , pl. 4, fig. 3. Non Calloporina sculpta Canu & Bassler, 1929 . Calloporina hayamiae Arakawa, 1995 : 98 , fig. 9A. Material examined. Unique colony (NIBRIV00000805890), from Hajo Island , South Sea , 30 July 2016 , 33 m, on oyster shell, collected by grab from RV Kuklipgongwon-yeoungu 1. Description. Colony encrusting, multiserial, unilaminar, large, up to 77 mm across. Autozooids fairly regularly rhomboidal, rounded distally and proximally, more acute laterally, a little longer than wide. Lepralioid frontal shield with 12–17 conspicuous areolar-septular pores around margin, with slight ribbing between pores that converges to low frontal-shield ridges of irregular disposition. Orifice high-arched; weakly concave proximal margin with low, sloping condyles in corners. Oral spines 5–6, stout. Ascopore at some distance from orifice, incised, semi-lunate, very thin, lacking denticles. Avicularia mostly single, on left or right sides of autozooids, less often paired, rarely absent; rostrum moderately long, acute, directed mostly obliquely distolaterally, tip often projecting just beyond lateral margin, crossbar well developed; half rostral length with palatal shelf, no opesial cryptocyst. Developing ooecium with extensive membranous area of proximofrontal ectooecium that is calcified around periphery and has apical transverse rimmed cap; endooecium skeletally complex, initially with transverse creases proximofrontally and honeycomb of calcification frontally; as development proceeds, lateral calcification of ectooecium covers most of endooecium, leaving bean-shaped or bifenestrate window showing endooecial pits, distal of which is rimmed ectooecial cap, itself sometimes etched. Well-developed basal pore-chambers at colony margin, two distolateral, one distal, each subdivided into paired chambers. Ancestrula not seen. Measurements. ZL 388–524 (432) µm; ZW 295–551 (378) µm; OrL 87–108 (99) µm; OrW 91–110 (100) µm; AvL 101–158 (138) µm; AvW 39–67 (55) µm; OoL 137–166 (156) µm; OoW 153–186 (172) µm. Remarks. Calloporina hayamiae was previously known only as a Pleistocene fossil from the Boso Peninsula, on the east coast of central Honshu, Japan . The characters of our material are identical to that described by Arakawa (1995) , especially the distinctive semi-lunate ‘smile-like’ ascopore incised within sloping margins, and the form of the mature ooecium. Arakawa (1995) noted a range of 4–6 oral-spine bases. Calloporina hayamiae has not yet been reported from modern Japanese waters but it is highly likely that it will be discovered. Distribution. Japan : Pleistocene, east-central Honshu. Korea : Jeju Island, 20 m depth.