CRIBRILINIDAE Hincks, 1879

Dick, Matthew H., Tilbrook, Kevin J. & Mawatari, Shunsuke F., 2006, Diversity and taxonomy of rocky-intertidal Bryozoa on the Island of Hawaii, USA, Journal of Natural History 40 (38 - 40), pp. 2197-2257 : 2213-2214

publication ID	https://doi.org/ 10.1080/00222930601062771
persistent identifier	https://treatment.plazi.org/id/3C0487C6-FFA3-942B-BAFF-C1E4FC423955
treatment provided by	Felipe
scientific name	CRIBRILINIDAE Hincks, 1879
status

Treatment

Family CRIBRILINIDAE Hincks, 1879 View in CoL

Genus Puellina Jullien, 1886 View in CoL Puellina harmeri Ristedt, 1985 View in CoL

( Figure 6A, C, E, G View Figure 6 )

Puellina harmeri Ristedt 1985, p 26 View in CoL , Figures 1 View Figure 1 , 6a–e View Figure 6 , 7a–k View Figure 7 , 8a–j View Figure 8 , 9a–d View Figure 9 .

Cribrilaria harmeri: Hayward 1988, p 290 , Plate 3c.

Measurements ZL, 0.30–0.43 (0.334¡0.037). ZW, 0.23–0.28 (0.255¡0.017). OrL, 0.04–0.07

(0.052¡0.008). OrW, 0.06–0.08 (0.068¡0.006). OvL, 0.14–0.18 (0.159¡0.015). OvW, 0.14–0.17 (0.156¡0.010).

Description

Colony unilaminar, encrusting, forming small whitish patches; zooids separated by a sharp groove. Frontal shield in astogenetically mature zooids ( Figure 6A, E, G View Figure 6 ) composed of 15– 18 (mode516) fused costae that rise at an angle to the margin, then turn gently to form the slightly convex surface of the shield; a boss is poorly developed or lacking at the angle of the turn; four to six (mode5five) intercostal pores between adjacent costae. Subapertural lumen generally single, conspicuous, close to proximal margin of orifice, bounded proximally by short pair of costae that sometimes form a small umbo in midline; sometimes a second, smaller suboral lumen is present just proximal to the first. Primary orifice ( Figure 6C View Figure 6 ) semicircular, proximal margin straight, with seven stout, closely spaced oral spines. Small, irregularly shaped kenozooids occur rarely among feeding zooids, with a smooth gymnocystal rim, fewer than 10 costae, and no orifice. Ovicellate zooids with five oral spines; ovicell ( Figure 6A View Figure 6 ) globose, smooth, with a slight, proximodistally elongate ridge or umbo near proximal margin; ovicell incorporates one pair of spines and abuts another at proximolateral corners, with fifth spine hidden by ovicell and probably lost. Interzooidal avicularia ( Figure 6A, E View Figure 6 ) uncommon, usually arising from distolateral corner of a zooid, the chamber bulbous, the rostrum long and tapering, with serrate edges; some zooids have on one or both sides of ovicell a smaller adventitious avicularium ( Figure 6A View Figure 6 ) pointing distally, connecting to a pore in proximolateral wall of ovicell; ovicell of type C, a distal component of a maternal zooid ( Bishop and Househam 1987). Ancestrula autozooids, ovicellate zooids, and a marginal avicularium; (D) holotype (NHM 2006.7.21.6), ancestrula and periancestrular zooids; (F) paratype, enlargement of marginal avicularium seen in (B); (H) paratype, oblique view of most of the same zooids as seen in (B). All specimens bleached. Scale bars: 400 Mm (A, B, E); 200 Mm (C, D, G, H); 100 Mm (F). Note that pairs (A, B), (C, D), and (G, H) are to same scale.

( Figure 6C View Figure 6 ) tatiform, with 12 spines; initially gives rise to a distal and a pair of distolateral daughter zooids.

Remarks

Our material may have smaller zooids and ovicells than indicated in Ristedt’s (1985) original description, although this is unclear, since Ristedt included only maximum zooidal measurements. Orifice measurements are very similar, as are virtually all morphological features, including the 12-spined tatiform ancestrula, periancestrular zooids with around 10 costae, and a type C ( Bishop and Househam 1987) ovicell.

Three nominal species of tropical Puellina with seven oral spines have previously been described: P. africana Hayward and Cook, 1983 ; P. harmeri Ristedt, 1985 ; and P. vulgaris Ryland and Hayward, 1992 . Puellina africana is distinct in having fewer costae than the latter two species, and a triangular suboral area with up to five large pores. However, it is not entirely clear from the description of P. vulgaris what distinguishes it from P. harmeri . Ryland and Hayward (1992) mentioned as diagnostic characters for P. vulgaris seven oral spines, a conspicuous subapertural lacuna, and a rather small avicularium. The first two characters apply as well to P. harmeri , and avicularium size in P. vulgaris appears to fall within the range of intercolony variation in P. harmeri . Zooid size is an ambiguous character, as Ristedt (1985) mentioned only maximum zooidal dimensions, whereas Ryland and Hayward (1992) gave an average. Tilbrook (2006) described the ancestrula of P. vulgaris as tatiform, but with 14 spines rather than the 12 spines originally reported for P. harmeri and present in our material. Although these two species may eventually prove to be synonymous, further study is needed to determine whether this is the case.

Distribution

Ristedt (1985) originally described P. harmeri from the Philippines, but also reported it from the Red Sea and Seychelle Islands, noting that it was the most common and widely distributed among the five Indo-Pacific Puellina (Cribrilaria) he studied; Hayward (1988) reported it from Mauritius. This is the first record for the Hawaiian Islands.