Calyptotheca lardil , Cumming, Robyn L. & Tilbrook, Kevin J., 2014

Cumming, Robyn L. & Tilbrook, Kevin J., 2014, Six species of Calyptotheca (Bryozoa, Cheilostomata, Lanceoporidae) from the Gulf of Carpentaria and northern Australia, with description of a new species, Zootaxa 3827 (2), pp. 147-169: 164-165

publication ID

http://dx.doi.org/10.11646/zootaxa.3827.2.2

publication LSID

lsid:zoobank.org:pub:D9AEB652-345E-4BB2-8CBD-A3FB4F92C733

persistent identifier

http://treatment.plazi.org/id/64480F01-FFE0-2762-FF04-B153FA19F814

treatment provided by

Plazi

scientific name

Calyptotheca lardil
status

n. sp.

Calyptotheca lardil  n. sp.

( Figure 7View FIGURE 7, Table 7)

Material Examined. Holotype: MTQ G 26483View Materials, Bryomol Reef, 16 ° 26.312 ' S, 139 ° 52.748 ' E, encrusting Adeonella  , 34.5 m.

Paratypes: Bryomol Reef: MTQ G 26484View Materials, same data as holotype. MTQ G26485View Materials, 16° 28.819 ' S, 139 ° 55.419 ' E, encrusting shell, 32.5 m. MTQ G26486View Materials, 16° 32.658 ' S, 139 ° 53.567 ' E, encrusting rock, 33 m. MTQ G26487View Materials, 16° 26.721 ' S, 139 ° 54.028 ' E, encrusting shell, 33.5 m. MTQ G26488View Materials, 16° 26.721 ' S, 139 ° 54.028 ' E, encrusting Adeonella  , 33.5 m. MTQ G26489View Materials, 16° 28.929 ' S, 139 ° 54.34 ' S, encrusting Adeonella  , 41.5 m. MTQ G26490View Materials, 16° 31.653 ' S, 139 ° 54.589 ' E, encrusting shell, 36.5 m. MTQ G26491View Materials, 16° 26.574 ' S, 139 ° 50.975 ' E, encrusting shell, 27.5 m. MTQ G26492View Materials, 16° 31.064 ' S, 139 ° 56.755 ' E, encrusting rock, 33 m.

Southeastern GoC: MTQ G 26514View Materials, G26493View Materials, 16° 40.914 ' S, 140 ° 12.092 ' E, 33 m.

Etymology. Named for the Lardil  people, the traditional owners of the land and surrounding seas of Mornington Island, Gulf of Carpentaria; noun in apposition.

Description. Colony encrusting. Autozooids relatively small (c. 0.3 × 0.25 mm; Table 7), rectangular to irregularly polygonal. Frontal shield convex, uneven, with relatively small, widely spaced pseudopores in pits (average 42 per zooid), separated by more than two pseudopore diameters, variable in shape, some kidney-shaped, extending to zooid borders. Interzooidal boundaries marked by thin raised rims and elongate areolar-septular pores. Lateral walls between zooids with 1–2 uniporous septula. Kenozooids occasionally replacing autozooids, lacking orifice and pseudopores, bearing avicularia of the same type and in the same position as those of autozooids.

Primary orifice pyriform, as wide as long (c. 0.8 mm), broadest distally, anter rounded, lunula restricted to distal half of orifice, poster with deep, semicircular sinus, condyles rounded, serrate. A low, thickened rim of calcification surrounding proximal side of orifice.

Each zooid with a single, small, subrounded suboral, medial avicularium on inflated cystid, with a tall protuberance of cystid proximal to avicularium occupying approximate centre of zooid; proximal edge of avicularium thus raised, directing avicularium proximofrontally; rostrum semicircular, crossbar complete, proximal and distal opesiae oval.

Ovicell recumbent upon frontal shield of distal zooid, as wide as zooid, not crossed by suture lines. Orifice dimorphism not distinctive but ovicellate orifices slightly wider than autozooid orifices (c. 0.09 vs 0.08 mm; Table 7).

Ancestrula with four spines, one pair midway, one pair distally.

Remarks. Calyptotheca lardil  n. sp. is notable for having a smaller orifice and zooids than the other species described herein, with a tall protuberance of the avicularian cystid in the centre of the zooid, with frontally tilted avicularium. This taxon belongs to a group of species with a single, subrounded, suboral, medial avicularium on each zooid, which includes C. immersa ( Powell, 1967)  , C. inclusa  , C. kapaaensis  Dick, Tilbrook & Mawatari, 2006, C. reniformis  , C. subimmersa  ( MacGillivray, 1879), Schizomavella collina Cook, 1965  and S. incompta  ( Hayward, 1988 b). Of these, only C. immersa  , C. inclusa  , C. reniformis  and S. incompta  share a pyriform orifice with C. lardil  n. sp., and of these, only C. immersa  shares the tall central protuberance. Both C. inclusa  and C. reniformis  have suboral avicularia with a trifoliate distal opesia and vicarious avicularia ( Harmer 1957; Tilbrook, unpubl. data), neither of which have been observed in C. lardil  n. sp. Schizomavella incompta  is known only from Mauritius and has additional proximal triangular adventitious avicularia on some zooids. Calyptotheca immersa  from New Zealand has squared non-serrate condyles, immersed ovicells with Y-shaped suture lines and stronger orificial dimorphism than C. lardil  (see Gordon 1989, p. 37, pl. 18).

Distribution. Known only from southeastern GoC, with most of the specimens found in the Bryomol Reef area encrusting small pebbles, shells and the habitat-providing bryozoan Adeonella  sp., at depths of 27.5–41.5 m.

TABLE 7. Measurement (mm) and count data for Calyptotheca lardil n. sp. (holotype: MTQ G 26483)

  Standard Deviation 0.019
  0.250 0.080 0.079   0.210–0.316 10 0.075–0.085 8 0.076–0.085 8
Adventitious avicularium length Adventitious avicularium width Diameter of perforations in frontal shield

TABLE 7. Measurement (mm) and count data for Calyptotheca lardil n. sp. (holotype: MTQ G 26483)

  Standard Deviation 0.019
  0.250 0.080 0.079   0.210–0.316 10 0.075–0.085 8 0.076–0.085 8
Adventitious avicularium length Adventitious avicularium width Diameter of perforations in frontal shield