Tenerodus fallax (Lüttschwager, 1922)

Mcfadden, Catherine S. & Van Ofwegen, Leen P., 2017, Revisionary systematics of the endemic soft coral fauna (Octocorallia: Alcyonacea: Alcyoniina) of the Agulhas Bioregion, South Africa, Zootaxa 4363 (4), pp. 451-488: 476-479

publication ID

https://doi.org/10.11646/zootaxa.4363.4.1

publication LSID

lsid:zoobank.org:pub:86DE1B94-63AE-4ABF-B28A-0ECEA22D2F10

persistent identifier

http://treatment.plazi.org/id/038A0776-6C13-2866-FF24-5A22FEA9492B

treatment provided by

Plazi

scientific name

Tenerodus fallax (Lüttschwager, 1922)
status

n. comb.

Tenerodus fallax (Lüttschwager, 1922)  , n. comb.

Figs. 5g –hView FIGURE 5, 13b–cView FIGURE 13, 15–16View FIGURE 15View FIGURE 16

Non Alcyonium purpureum Lamarck, 1836: 608  .

Alcyonium purpureum  (non Lamarck, 1836) Hickson, 1904: 215–217, pls. 7, 9; Thomson, 1910: 566–568, pls. 3–4; Lüttschwager, 1914: 25–26; Thomson, 1921: 156; Thomson, 1923: 47, 52, 68; Day et al. 1970: 15.

Alcyonium fallax Lüttschwager, 1922  (nom. nov.): 520, 534; Lüttschwager, 1926: 288.

Alcyonium fauri  (non Thomson, 1910) Broch, 1939: 8–11; Williams, 1992a (part): 277–282, fig. 1B; 1992b: 381–385, 396, fig. 20G; Branch et al. 2010: 38, fig. 12.8.

Parerythropodium fallax Day et al. 1970: 15  .

Parerythropodium purpureum Day, 1974: 34  ; Branch & Branch 1981: 152, pls. 34, 37.

? Parerythropodium wilsoni  (non Thomson, 1921) Day 1974: 34; Branch & Branch, 1981: 152.

Material examined. RMNHAbout RMNH Coel. 40218 (SAF013), CASIZ 222381 (SAF014), SAF015, South Africa, Western Cape, Mossel Bay , Phluffy Reef , 34º10.988'S, 22º09.745'E, depth 12–15 m, coll. C.S. McFadden, 0 8 March 2008GoogleMaps  . RMNHAbout RMNH Coel. 40216 (SAF059), RMNHAbout RMNH Coel. 40215 (SAF067), South Africa, Eastern Cape, Port Elizabeth , Algoa Bay, Bell Buoy 1, 33º58.927’S, 25º41.473’E, depth 20 m, coll. C.S. McFadden, 10 March 2008GoogleMaps  . RMNHAbout RMNH Coel. 40214 (SAF072), CASIZ 222384 (SAF073), SAF084, South Africa, Eastern Cape, Port Elizabeth, Algoa Bay , Philips Reef , 33º15.933'S, 25º41.768'E, depth 10–12 m, coll. C.S. McFadden, 10 March 2008GoogleMaps  . SAF098, South Africa, Eastern Cape, Port Elizabeth, Algoa Bay, Riy Banks , 33º59.069'S, 25º51.841'E, depth 14–17 m, coll. C.S. McFadden, 11 March 2008GoogleMaps  . RMNHAbout RMNH Coel. 40217 (SAF383), SAF384, CASIZ 222395 (SAF386), South Africa, Western Cape , Cape Peninsula, Vulcan Rock, 34º03.970'S, 18º18.627'E, depth 15–27 m, coll. C.S. McFadden, 23 March 2008GoogleMaps  .

Description. As re-described by Williams (1992a), Alcyonium fauri Thomson  sensu lato encompasses material with a wide range of colony growth forms (“membranous, globular to capitate, or lobate”), colors (“purple, pink, white, golden yellow, orange, or dark smoke-grey to dark brown”), and polyp armature (polyp sclerites ranging from dense to very sparse or absent). We consider it likely that multiple species have been lumped within this broad definition of this taxon. Here we re-describe newly collected material that matches the original description of Alcyonium purpureum Hickson  (= Alcyonium fallax Lüttschwager  ) and Thomson’s (1910) later more detailed description of that species. Some of our material was collected from a site very close to the type locality in Mossel Bay.

T. fallax  n. comb. forms encrusting to lobate colonies in which the polyps arise from a membranous base and are fused together along their lengths to form a more-or-less homogeneous mass ( Fig. 13b, cView FIGURE 13). The polyps are prominent, and remain oriented vertically with their oral surfaces facing upwards, even when retracted. There is little colony coenenchyme between neighboring polyps, with the result that in those polyps that are located on the periphery of the colony the entire length of the polyp body remains visible and distinguishable from its neighbors. When fully retracted the polyps remain visible as coenenchymal mounds. Colonies range from encrusting, a few mm thick, to erect forms> 3 cm tall with multiple lobes. They often grow attached to other organisms such as worm tubes or bivalve shells.

The polyp sclerites are robust spindles and slightly clubbed forms, 0.16–0.25 mm long, with complex tubercles ( Fig. 15aView FIGURE 15), and torch-like clubs, 0.13–0.22 mm long, with asymmetrical heads of smooth, spinose processes ( Fig. 15bView FIGURE 15). They are arranged in eight longitudinal tracts in the base of the polyp and extend distally to form points at the bases of the tentacles. A collaret of transverse sclerites is lacking. The tentacles have smooth, flat, antler-like rods, 0.12–0.18 mm long ( Fig. 15cView FIGURE 15). In the surface of the polyparium and base of the colony there are radiates, 0.06–0.11 mm long, and tuberculate spheroids, 0.08–0.13 mm long ( Fig. 15dView FIGURE 15), in addition to the same types of spindles and clubs found in the polyps. As one moves from the base of a polyp to the base of the colony the proportion of sclerite types shifts gradually from predominantly spindles and clubs to predominantly radiates and spheroids, but there is no sharp demarcation in sclerite form between different anatomical regions. The colony interior contains mostly spheres and radiates of the same sizes and shapes as those found in the surface of the base ( Fig. 16View FIGURE 16).

Color. In life, vivid purple, yellow, pink, or white with purple or yellow highlights ( Fig. 5g, hView FIGURE 5). All colors turn brown to cream in EtOH. Sclerites colorless.

Remarks. Hickson (1904) first described Alcyonium purpureum  non Lamarck, a bright purple colony collected from the jetty at Mossel Bay. Thomson (1910) subsequently identified this same species in his material. Thomson’s description and illustration of A. purpureum Hickson  best matches the specimens described here: colonies consisting of a number of lobes arising from an encrusting membrane; sclerite forms are mostly clubs, spindles, tuberculate spheres and "double spheres", similar in all parts of the colony; spindles arranged in eight parallel bands and irregularly en chevron in the polyps; some radiates (“double clubs”) in the colony base; color in life due to a soluble purple pigment. From this description we conclude that our material corresponds to Thomson’s A. purpureum Hickson. Lüttschwager (1922)  recognized that the name A. purpureum  used by Hickson was preoccupied by a species from Australia ( A. purpureum Linnaeus  ), and re-named the South African species Alcyonium fallax  nom. nov.

In the same paper in which he identified purple, lobate colonies as A. purpureum Hickson, Thomson (1910)  described Alcyonium fauri  , a brown, encrusting colony that lacks sclerites in the polyps and colony interior, and has only “double wheels” in the colony surface. From his illustrations these sclerites appear to be compact radiates or spheroids with sparse ornamentation and a median waist. Based on examination of material collected by Carlgren (and apparently not the material of Thomson), Broch (1939) concluded that there was wide variation in the degree of polyp armature and presence of interior sclerites among specimens, and consequently synonymized A. fauri  with A. fallax  , the former name taking precedence. Williams (1992a) accepted Broch’s conclusion that A. fauri  and A. purpureum Hickson  (= A. fallax Lüttschwager  ) are synonyms, but he also does not appear to have examined the material of Thomson. Thomson's original material was also unavailable to us for examination, but based on his illustrations and detailed descriptions, we disagree that these two forms are synonymous, and retain the species name fallax  for material that fits the description given above. Thomson’s (1910) description of A. fauri  does not closely match any species recorded subsequently from South Africa with the possible exception of Porphyrophyton distinctum  n. comb. (see remarks above for that species).

Although Williams (1992a) illustrated the range of variation in polyp armature and sclerite form he observed among three colonies he examined, he did not indicate which specimens were illustrated or which sclerite variants came from which colony. The absence of such information makes it impossible to determine if any of the specimens he included within A. fauri  sensu lato match those we recognize here as different species. The colony forms he illustrates in Figs. 1BView FIGURE 1, 13B, and 13EView FIGURE 13, and the polyp armature depicted in Fig. 14AView FIGURE 14 most closely match T. fallax  n. comb.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Alcyonacea

Family

Paralcyoniidae

Genus

Tenerodus

Loc

Tenerodus fallax (Lüttschwager, 1922)

Mcfadden, Catherine S. & Van Ofwegen, Leen P. 2017

2017
Loc

Parerythropodium wilsoni

Mcfadden & Van Ofwegen 2017

2017
Loc

Parerythropodium purpureum

Day 1974: 34

1974
Loc

Parerythropodium fallax

Day et al. 1970: 15

1970
Loc

Alcyonium purpureum

Lamarck 1836: 608

1836
Loc

Alcyonium purpureum

Lamarck 1836

1836