Jullienula erinae, Yang & Seo & Min & Grischenko & Gordon, 2018

Yang, Ho Jin, Seo, Ji Eun, Min, Bum Sik, Grischenko, Andrei V. & Gordon, Dennis P., 2018, Cribrilinidae (Bryozoa: Cheilostomata) of Korea, Zootaxa 4377 (2), pp. 216-234 : 224-225

Jullienula erinae n. sp.

( Figs 20–27 )

Etymology. The species name honours the daughter of Prof. Ji Eun Seo.

Material examined. Holotype: NIBRIV0000805951 , W of Cheongsan Island, South Sea , 34.1585° N, 126.7689° E, 29 July 2016, 42 m. Paratype: NIBRIV0000805952, Cheongpodae, Yellow Sea coast, 36.6334° N, 126.2997° E, 26 May 2017, low tide zone. Other material: Baengnyeong Island: Hwadong, 2 colonies; Junghwadong 86 colonies; Dumujin 169 colonies; Gobongpo, 13 colonies; Jinchon, 25 colonies. West coast: Cheongpodae, 3 colonies. South Sea: Cheongsan Island, 1 colony.

Description. Colony encrusting, unilaminar, multiserial, large, up to 80 mm across, transparent with yellowish tinge, colony margin with deep-yellow pigment granules. Autozooids more or less elongate-oval or with angular proximal end, widest about mid-length. Frontal shield comprising 8–10 (mostly nine) costae, pinnate except in suboral pair ( Figs 20–21 ), the latter more or less parallel-sided, the rest triangular, opposing pairs meeting at weakly defined irregular median suture line; 3–5 slit-like lacunae between adjacent costae. First pair of costae each with rounded lobe extending half-length of orifice on each side. 2–3 pseudopores on all lateral costae; proximal triangular costae generally with only one pseudopore. No gymnocyst; costae originate at zooid margin. Orifices campanuliform, dimorphic. Autozooidal orifice somewhat parallel-sided, with cowl-like distal rim, the proximal ends of which serve as condyles; poster broader than anter, with straight or weakly concave proximal margin. No oral spines. No avicularia. Primary female orifice wider than autozooidal orifice, partly concealed by proximal ooecial margin, lateral margins oblique, diverging proximally. Ooecium reduced in size, scarcely elevated, forming an arch around orifice that meets first pair of costae ( Figs 24–25 , 27 ), smooth, typically with 3 pseudopores in distal half, occasionally with an additionally smaller pore on each side in proximal half. Embryo pale orangeyellow. Basal pore-chambers absent; uniporous septula in lateral walls. Ancestrula not seen.

Measurements. ZL, 444–579 (501) µm; ZW, 247–346 (304) µm; OrL, 113–126 (120) µm; OrW, 112–125 (120) µm; OoL 78–106 (89) µm; OoW 185–243 (214) µm.

Remarks. Jullienula erinae sp. nov. resembles the type species of the genus, Jullienula hippocrepis ( Hincks, 1882) , in having three pseudopores in the reduced ooecium; Soule et al. (1995) interpreted these as a pair of costal pores and an intercostal pore and that the ooecium is derived from modified costae. Jullienula erinae sp. nov.

differs from J. hippocrepis in having more-obviously dimorphic orifices, narrower ooecia and more pseudopores in each costa. Hirose (2010) illustrated by SEM the Japanese species Cribrilina ortmanni Silén, 1941 . This is yet another species of Jullienula , which differs from J. erinae sp. nov. in lacking costal and ooecial pseudopores. At Cheongpodae, colonies were seen with embryos in late May (late spring).

Distribution. Yellow Sea: Cheongpodae; South Sea: W of Cheongsan Island. Depth 0–42 m.

Figures

FIGURES 20–25. Jullienula erinae n. sp. 20–21, 24–25, W of Cheongsan Island, South Sea; 22–23, Baengnyeong Island.20, ovicellatezooids,showing reduced crescentic ooecia; 21, autozooids near margin of a layerof self-overgrowth; 22,orifices and buds at colony margin; 23, autozooids with opercula in place; 24, close-up of two ooecia; 25, autozooidal and ovicellate orifices, the latter showing an ooecium a little larger than is usual, the distal portion of which clearly contributes to the costal shield.Scale bars:20–21, 500 µm; 22–23, 100 µm; 24–25, 200 µm.

FIGURES 26–27. Jullienula erinae n. sp., W of Cheongsan Island, South Sea. 26, inner face of autozooidal costal shield, showing two of the relatively large entrances to costal lumina (arrows); 27, autozooidal and ovicellate orifices, the latter with a short, transverse crescentic fissure. FIGURES 28–29. Figularia japonica Silén, Munseom Island, Seogwipo, Jeju Island. 28, autozooids, ovicellate zooids and vicarious avicularia; 29, an ooecium inwhich the left-hand fenestra hasnot been divided by a strip of calcification from the lateral margin.Scale bars: 26, 100 µm; 27, 200 µm; 28, 500 µm; 29, 100 µm.