Acanthodesia cf. falsitenuis ( Liu, 1992 ) Taylor & Tan, 2015
publication ID |
https://doi.org/ 10.5852/ejt.2015.149 |
DOI |
https://doi.org/10.5281/zenodo.3793835 |
persistent identifier |
https://treatment.plazi.org/id/9C3C87B4-BB3E-E433-FE69-F946FBB9FC32 |
treatment provided by |
Carolina |
scientific name |
Acanthodesia cf. falsitenuis ( Liu, 1992 ) |
status |
comb. nov. |
Acanthodesia cf. falsitenuis ( Liu, 1992) View in CoL comb. nov.
Fig. 3 View Fig A–C
cf. Membranipora falsitenuis Liu, 1992: 112 View in CoL , figs 3–6.
Material
MALAYSIA: MSL BRY003, Kampung Kuala Temoyong, Langkawi, encrusting an oyster found among fishing debris.
Description
Colony encrusting, multiserial, unilamellar, locally multilamellar. Ancestrula and early astogenetic stages not observed. Autozooids subhexagonal or subrectangular, distally well-rounded, elongate, 0.53– 0.73 mm long by 0.30–0.40 mm wide, zooidal boundaries marked by a fissure; mural rim salient, narrow, pustulose, pustules forming a single row; opesia occupying most of frontal surface, rim broadened distally, edged with tiny pustules; gymnocyst lacking; cryptocyst occupying one-third to almost one-half of proximal end of zooid, planar, sparsely pustulose, with a variably developed, anvil-shaped process bearing long spines extending for up to 0.14 mm over opesia ( Fig. 3 View Fig B–C); no spine bases, spinules or tubercles. Kenozooids developed at convergences between colony lobes ( Fig. 3A View Fig , upper right corner), variable in shape and size, opesia ovoidal.
Remarks
The most striking feature of this species is the anvil-shaped, spinose cryptocystal process projecting over the opesia ( Fig. 3 View Fig B–C). Similar processes were depicted in zooids of two species from the South China Sea – Acanthodesia similis ( Liu, 1992) (see Liu et al. 2001: pl. 9, fig. 2) and A. falsitenuis ( Liu, 1992) (see Liu 1992: fig. 3) – and also in Acanthodesia crenulata (Okada, 1923) , described by Tilbrook (2006: pl. 2b) from the Solomon Islands. Autozooids of A. similis are about half the length of those of the species described here from Langkawi, but judging from the scale bar shown by Liu (1992) in his figure of A. falsitenuis , this latter species is about the same size as the Langkawi material. However, the cryprocystal process is less developed in the Chinese material of A. falsitenuis and this also has zooids of a more rectangular shape with more ragged edges to the lateral cryptocyst.
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Genus |
Acanthodesia cf. falsitenuis ( Liu, 1992 )
Taylor, Paul D. & Tan, Shau-Hwai Aileen 2015 |
Membranipora falsitenuis
Membranipora falsitenuis Liu, 1992: 112 |