Sinoflustra amoyensis ( Robertson, 1921 )
publication ID |
https://doi.org/ 10.5852/ejt.2015.149 |
DOI |
https://doi.org/10.5281/zenodo.3793815 |
persistent identifier |
https://treatment.plazi.org/id/9C3C87B4-BB31-E43F-FDA8-FC53FDC3FAA2 |
treatment provided by |
Carolina |
scientific name |
Sinoflustra amoyensis ( Robertson, 1921 ) |
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Sinoflustra amoyensis ( Robertson, 1921) View in CoL
Fig. 5 View Fig D–F
Membranipora amoyensis Robertson, 1921: 49 , fig. 6.
Sinoflustra amoyensis View in CoL – Liu & Yang 1995: 349, figs 1–2.
Material
MALAYSIA: MSL BRY010, Batu Muang, Penang, encrusting a barnacle from debris adjacent to a fishing jetty.
Description
Colony encrusting, multiserial, unilamellar. Ancestrula and early astogeny not observed. Autozooids subrectangular, rounded distally, slender, typically twice as long as wide, 0.43–0.63 mm long by 0.18–0.28 mm wide; zooidal boundaries marked by a narrow fissure; opesia occupying two-thirds of frontal surface, elongate inverted pear-shaped; cryptocyst convex, widest proximally, narrowing distally, covered by small pustules, about 10–16 cryptocystal spinules extending from mural rim over proximal two-thirds of opesia, but not meeting, distal third of opesia broad and spineless ( Fig. 5F View Fig ); gymnocyst lacking. Spines present at distolateral corners of autozooids, spines broken off in studied specimens, leaving a small rounded triangular base with a central pore ( Fig. 5F View Fig ). Avicularia not observed.
Remarks
The original figure of Robertson (1921: fig. 6) shows zooids with branching spines at the distolateral corners. Although spines are not preserved in the studied material from Penang, their bases are clearly visible in these locations. Robertson’s Chinese material also has slightly shorter cryptocystal spinules and the opesia is ellipsoidal in outline compared with the elongate inverted pear-shaped opesia of the Penang specimens. However, Liu et al. (2001: pl. 18, fig. 3) figured a Chinese specimen of S. amoyensis with longer spinules and opesia that broaden distally. A putative colony of this species epizoic on a turtle has broader autozooids and short cryptocystal spinules ( Frazier et al. 1992: fig. 1). In view of the morphological variability encompassed by specimens assigned to the species, the Penang material can be identified as S. amoyensis .
Not seen in the Malaysian specimens, but sporadically developed elsewhere in this species, are vicarious avicularia (e.g., Liu et al. 2001: pl. 18, fig. 3). These are longer and wider than the autozooids, and the distal part of the opesia is particularly broad, raised slightly and separated from the proximal part by two small, condyle-like indentations.
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Genus |
Sinoflustra amoyensis ( Robertson, 1921 )
Taylor, Paul D. & Tan, Shau-Hwai Aileen 2015 |
Sinoflustra amoyensis
Liu X. & Yang Z. 1995: 349 |
Membranipora amoyensis
Robertson A. 1921: 49 |