Characella poecillastroides Van Soest, Meesters & Becking, 2014,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 101-102

publication ID

http://doi.org/ 10.5281/zenodo.272951

publication LSID

lsid:zoobank.org:pub:6D68A019-6F63-4AA4-A8B3-92D351F1F69B

persistent identifier

http://treatment.plazi.org/id/03A80010-7733-FFC9-FF14-A6189389F8D7

treatment provided by

Plazi

scientific name

Characella poecillastroides Van Soest, Meesters & Becking, 2014
status

 

Characella poecillastroides Van Soest, Meesters & Becking, 2014 

Figures 62View FIGURE 62 a –g

Characella poecillastroides Van Soest et al., 2014: 410  , figs 6a –d, 7a –e.

Material examined. RMNH Por. 9822, Suriname, ‘Luymes’ Guyana Shelf Expedition, station 1, 7.1667°N 53.5833°W, depth 104–130 m, bottom sandy calcarenite, 24 August 1970GoogleMaps  .

Description. Two fragments of a flattened sponge ( Fig. 62View FIGURE 62 a), overall size 11 x 7 x 2 cm. Surface smooth where not overgrown by a other sponges, but rough and hard in exposed places. Color in alcohol yellowish beige.

Skeleton. Ectosomal skeleton with a crust of acanthomicroxeas, carried by bundles of long oxeas and confusedly arranged plagiotriaenes. Choanosome with confused mass of spicules. The surface bears a crust of Parahigginsia cf. strongylifera  (see above).

Spicules. ( Figs 62View FIGURE 62 b –g) Oxeas, plagiotriaenes, amphiasters, acanthomicroxeas.

Oxeas ( Figs 62View FIGURE 62 b,b1) fusiform, curved, rather abruptly pointed, quite variable in length, 1350– 1943 –2450 x 34 – 55.2 –71 µm.

Plagiotriaenes ( Fig. 62View FIGURE 62 c), short-shafted, but usually the rhabd and the cladi are distinct, rhabdomes 294– 397 –520 x 24 – 29.5 –36 µm, cladomes 288– 334 –390 µm, cladi 126– 185 –234 x 23 – 26.2 –30 µm,

Amphiasters ( Fig. 62View FIGURE 62 d), with relatively robust and finely spined rays, overall diameter 16– 18.2 –21 µm.

Acanthomicroxeas ( Figs 62View FIGURE 62 e –g), in two to three size categories, (1) larger ( Figs 62View FIGURE 62 e,e1) 210–256–282 x 5 – 6.0 –6.5 µm, (2) intermediate ( Fig. 62View FIGURE 62 f), rare (n=4) 76–172 x 2–3 µm and (3) small ( Fig. 62View FIGURE 62 g) 34– 43 – 51 x 2.5– 3.1 –3.5 µm.

Distribution and ecology. Guyana Shelf, Bonaire, sandy and rocky bottoms at 104–168 m depth.

Remarks. The fragments reported here are closely similar in habit and spicules to the type. The plagiotriaenes are slightly smaller and there is a rare middle-sized acanthomicroxea (70–170 µm), which is not reported from the type.

The surface is encrusted by what appears to be a Parahigginsia  rather similar to what was recently described as P. strongylifera  , because of the possession of the characteristic acanthomicroxeas with thin erect spines. See above for a description and discussion. Remarkably, instead of strongyles, the spicules are thickly fusiform oxeas arranged in a confused reticulation. These spicules are also shorter, 171–204 x 9–14 µm than the strongyles of the type (290–370 x 10–18 µm). It remains to be decided whether the present encrustation falls within the variation of P. strongylifera  .

Puerto Rican Characella enae ( De Laubenfels, 1934)  (as Neothenea  , p. 5), (type specimen USNM 22321, slide re-examined), shows a general similarity to C. poecillastroides  . It has a flabellate shape, but its megascleres are consistently much longer and thicker than those of C. poecillastroides  : oxeas up to 12 mm x 106 µm, plagiotriaenes and dichotriaenes (not found in C. poecillastroides  ) with cladi similarly up to 100 µm in thickness, amphiasters are 25–30 µm and acanthomicroxeas show less differentiation in size categories.

RMNH

National Museum of Natural History, Naturalis

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Astrophorida

Family

Pachastrellidae

Genus

Characella

Loc

Characella poecillastroides Van Soest, Meesters & Becking, 2014

Van, Rob W. M. 2017
2017
Loc

Characella poecillastroides

Van Soest et al. 2014: 410
2014