Pleurocodonellina jeparaensis, Asagabaldan & Bourgougnon & Bedoux & Kristiana & Ayuningrum & Widyananto & Muchlissin & Magueresse & Sabdono & Trianto & Sa, 2019

Asagabaldan, M. A., Bourgougnon, N., Bedoux, G., Kristiana, R., Ayuningrum, D., Widyananto, P. A., Muchlissin, S. I., Magueresse, A., Sabdono, A., Trianto, A. & Sa, O. K. Radja-, 2019, Some Cheilostomata (Bryozoa) from the Java Sea, central Indonesian Archipelago with a description of Pleurocodonellina jeparaensis n. sp. (Smittinidae), Zootaxa 4668 (3), pp. 329-342 : 336-337

Pleurocodonellina jeparaensis n. sp.

( Figs 2E , 6 A–F; Table 5)

Material examined. Holotype: TAB 03 from Stn PP 01-2 . Paratypes: TAB 02 , TAB 05 , TAB 06 , from same locality as holotype .

Etymology. The species name alludes to the city of Jepara, which includes the coastal type locality in the Java Sea.

Description. Colony roughly circular, forming a unilaminar encrusting sheet ( Fig. 6A ), brownish orange. Autozooids subrectangular to polygonal ( Fig. 6B ), longer than wide, bordered by single row of 10–15 large (30–42 µm diameter) areolar pores, more developed in proximal region. Frontal shield calcified, relatively smooth but dimpled, becoming granular. Primary orifice subcircular in outline, wider than long; U-shaped median sinus broad, subrounded in shape, flanked by two sharp condyles with serrated tips ( Fig. 6C, E ). No oral spines. Secondary orifice low, forming a peristomial collar encircling the orifice in both ovicelled and non-ovicelled zooids. Most autozooids have a single adventitious avicularium placed proximolateral to orifice and directed proximally, rostrum elongateoval and rounded proximally, foramen elliptical, palate calcified, occupying less than half of avicularium chamber. Ovicell ( Fig. 6D, F ) prominent, globular, wider than long; ectooecium perforated frontally by numerous (38–43) irregular tiny pseudopores (diameter 5–9 µm).

Remarks. Pleurocodonellina jeparaensis n. sp. was found encrusting a bivalve shell fragment and rocks. The species is very similar in appearance to Pleurocodonellina macroperforata Tilbrook, 2006 and P. microperforata Tilbrook, 2006 . These species are broadly distributed in subtropical to tropical areas, especially in the western Pa- cific ( Tilbrook 2006). However, the new species has a proportionally wider sinus, and differs especially in details of the avicularia: in P. jeparaensis n. sp. the avicularium is weakly curving, with rounded tip and directed toward the frontal shield centre; in P. microperforata the avicularium is straight, with acute tip and directed away from the ori- fice, while in P. macroperforata avicularia are dimorphic, the small ones straight, with acute tip and directed to the frontal shield. Another significant difference is that, whereas the condyles delimiting the sinus are sharply angular in P. jeparaensis n. sp., they are rounded in the other two species and differ in the degree of serration of the inner condylar margin. Moreover, the shape of the exposed ectooecium in P. jeparaensis n. sp. is similar to P. microper- forata but differs from that in P. macroperforata that is more crescentic. The ooecial pseudopores of P. jeparaensis n. sp. differ from those in P. macroperforata in being often irregular in shape. Those are also larger and denser than in P. microperforata .

Distribution. This species is currently known only from 2–3 m depth at Teluk Awur Subdistrict (gulf), Java Sea, Indonesia.

Figures

FIGURE 2. Preserved samples of Recent bryozoans from the Java Sea, Indonesia. A. Licornia ferox (Busk, 1852). B. Poricel- laria ratoniensis Waters, 1887. C. Smittipora cordiformis Harmer, 1926. D. Celleporaria inaudita Tilbrook, Hayward & Gor- don, 1991. E. Pleurocodonellina jeparaensis n. sp. F. Triphyllozoon indivisum Harmer, 1934. Scale bars: A = 3 mm; B = 6 mm; C = 4 mm; D = 3 mm; E =1 mm; F = 4 mm.

FIGURE 6. Pleurocodonellina jeparaensis n. sp. A–D, TAB 03, holotype. A. General view of encrusting colony on a bivalve shell fragment. B. Group of autozooids. C. Close-up of autozooids. D. Group of ovicelled and non-ovicelled zooids. E–F, TAB 05, paratype. E. Close-up of the primary orifice showing short condylar denticulation. F. Group of ovicelled zooids. Scale bars: A = 500 μm; B–D, F = 100 µm; E = 50 µm.

Tables

TABLE 5. Measurements (µm) of Pleurocodonellina jeparaensis n. sp. (TAB 03). Min. Minimum; Max. Maximum; SE. Standard error; N. Sample size.

	Min	Max	Mean	SE	N
Autozooid length	337	466	409	34	16
Autozooid width	182	270	226	25	16
Orifice length	103	121	111	5	16
Orifice width	111	132	119	5	16
Avicularium length	88	105	96	6	16
Avicularium width	35	46	40	3	16
Ovicell length	88	123	111	11	10
Ovicell width	156	195	171	12	10