dcsimg

Description

provided by NMNH Antarctic Invertebrates

"Aulocyathus recidivus (Dennant, 1906) n. comb.

Ceratotrochus recidivus Dennant, 1906, pp. 159, 160, pi. 6, figs. 2a-2c.—Squires, 1961, p. 18; 1969, p. 16.—Zibrowius, 1980, p. 107.

Ceratotrochsu (sic) (Conotrochus) typus; Wells, 1958, pp. 265, 266, pi. 1, figs. 14, 15.

? Paracyathus conceptus; Squires and Keyes, 1967, p. 23 (part: C-648, pi. 2, figs. 7, 8).

Description. The following description is based primarily on the largest specimen from NZOI station C-734. Corallum ceratoid, straight with round calice. Corallum 10.3 mm in CD and 17.8 mm tall. Most specimens originally attached to internal sur face of fragment of parent specimen, from which they probably asexually budded. Some specimens originating from calice of unbroken parent specimen. Theca glossy, granular, sometimes marked by shallow striae. Costal granulation often indistinct and irregular. Calice usually round but maybe elliptical. Septa hexamerally arranged in four cycles. S1 larger than S2, these only slightly larger than S3. S4 smallest septa and never present as full cycle. Hexameral symmetry of younger specimens often not present; seven, eight, or nine groups of 4 or 6 septa often found. Large specimen with 40 septa includes two complete systems and four systems missing one pair of S4 each. Septa not exsert with straight, vertical inner edges. Septal granules small and blunt, uniformly distributed. Fossa deep. Columella composed of 11 individual, irregularly shaped rods.

Remarks. It is uncertain whether the corallum splits before the bud forms or whether the growing bud causes the corallum to fracture. Dennant (1906) implies the latter, whereas Marenzeller (1904a) implies the former for a related species, A. juvenescens.

Discussion. There are three other nominal species of Aulocyathus. A. recidivus differs from the two species known from off Japan, A. mactricidum (Kent, 1871) and A. conotrochoides (Yabe and Eguchi, 1932), by having a large, distinct columella. It differs from A. juvenescens Marenzeller, 1904 (off East Africa", 400-463), in being less slender and having fewer septa at a corresponding calicular diameter. Wells's (1958) specimen measures 11.6 mm in CD, is 25.6 mm tall, and has 60 septa. Squires's (1969) reference to A. recidivus from the Macquarie Ridge was undoubtedly from NZOI station C-734.

Material. NZOI sta. C-734 (9), USNM 47524. Golden Hind sta. 35 (1), MCZ. Specimen of Wells (1958) identified as C. (C.) typus from Discovery sta. 115, South Australian Museum H 51.

Types. The 'numerous' syntypes of C. recidivus are not at the Australian Museum (Zibrowius, 1980) and have not been traced further.

Distribution. Off southeastern Australia; off Tasmania; Macquarie Ridge (Map 5.) Depth range: 128-732 m." Cairns 1982, Plate 7, figs. 7-9; Plate 8, fig. 1

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Aulocyathus recidivus (Dennant, 1906)

Ceratotrochus recidivus Dennant, 1906:159–160. pl. 6: figs. la,b, 2a–c.

Aulocyathus recidivus.—Cairns, 1982:25–26. pl. 7: figs. 7–9; pl. 8: fig. 1 [synonymy],—Cairns and Parker, 1992:22–24, pl. 6: figs, d.e.g.h.—Cairns and Keller. 1993:247. fig. 5c.

DESCRIPTION OF SPECIMEN FROM Alb-4958.—Corallum ceratoid: 8.7 mm in calicular diameter, 11.4 mm in height, and 3.9 mm in pedicel diameter. Corallum still attached to a wedge of parent corallum from which it asexually budded. Costae well defined only near calicular edge, being equal in width (about 1 mm), flat, and bearing coarse, hollow, conical granules. Calicular perimeter evenly serrate, a small triangular to rounded apex corresponding to each septum. Upper thecal edge extends about 0.7 mm above upper outer septal edges, forming a circular rim around the calice and extending above the upper septal edges. Corallum white.

Septa hexamerally arranged in 4 cycles, the last cycle incomplete, only 4 pairs of S4 being present (32 total septa). S1 not exsert and have vertical, slightly sinuous, thin inner edges that extend to the columella. S2 about three-quarters width of S1, also have sinuous inner edges, and also attain the columella low in fossa. If an S3 is flanked by a pair of S4, the S3 is enlarged to almost the width of an S2, but if not flanked by S4, S3 only about half width of S2. S4 equal in size to unflanked S3. Fossa deep. Columella robust, composed of 10 tall, slender, granular papillae, some of which might be interpreted as paliform lobes of the S1–2.
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cc-by-nc-sa-3.0
bibliographic citation
Cairns, Stephen D. 1994. "Scleractinia of the temperate North Pacific." Smithsonian Contributions to Zoology. i-150. https://doi.org/10.5479/si.00810282.557.i

Biology

provided by World Register of Marine Species
azooxanthellate

Reference

van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO).

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Jacob van der Land [email]

Depth range

provided by World Register of Marine Species
128-1137 m
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copyright
WoRMS Editorial Board
contributor
Stephen Cairns [email]

Habitat

provided by World Register of Marine Species
Known from seamounts and knolls

Reference

Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
[email]

Habitat

provided by World Register of Marine Species
temperate; slope

Reference

van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO).

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Jacob van der Land [email]