Rhizaxinella clava ( Schmidt, 1870 ),

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 189-190

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/03A80010-77EB-FF11-FF14-A67492A8FE1D

treatment provided by

Plazi

scientific name

Rhizaxinella clava ( Schmidt, 1870 )
status

 

Rhizaxinella clava ( Schmidt, 1870) 

Figures 119View FIGURE 119 a –d

Axinella clava Schmidt, 1870: 61  .

Rhizaxinella clava  ; Alvarez et al. 1998: 15; Rützler et al. 2009: 297.

Material examined. RMNH Por. 9925, Suriname, ‘ Luymes O.C.P.S. II’ Guyana Shelf Expedition, station M97, 7.3083°N 54.1667°W, depth 130 m, Agassiz trawl, bottom coarse sand, 16 April 1969GoogleMaps  .

Description. Stalked sponge ( Fig. 119View FIGURE 119 a) with oval main body ( Fig. 119View FIGURE 119 a1). Total length of specimen 8 cm, body 12 mm high, 8 mm in diameter, stalk approximately 1.5 mm in diameter. Color pale brown in alcohol. Stalk optically smooth, main body microhispid. Oscule (now closed) apical on a slight elevation. Consistency of main body compressible.

Skeleton. The skeleton of the stalk consists of aligned long styles, penetrating the main body, where intermediate sized styles fan out and carry erect brushes of smaller tylostyles.

Spicules. ( Figs 119View FIGURE 119 b –d) Styles, tylostyles.

Long styles ( Figs 1 19View FIGURE 1View FIGURE 2View FIGURE 3View FIGURE 4View FIGURE 5View FIGURE 6View FIGURE 7View FIGURE 8View FIGURE 9View FIGURE 10View FIGURE 11View FIGURE 12View FIGURE 13View FIGURE 14View FIGURE 15View FIGURE 16View FIGURE 17View FIGURE 18View FIGURE 19 b,b1), straight, no visible tyles, longest spicules overlapping and intergrading with the intermediate styles ( Figs 119View FIGURE 119 c,c1) of the main body, overall sizes 814– 1334 –1936 x 10–15.4–22 µm.

Small tylostyles ( Figs 119View FIGURE 119 d,d1) of the surface brushes, straight, style-like but with a faint subterminal tyle or constriction, 186– 323 –474 x 3 – 5.2 –7 µm.

Distribution and ecology. Guyana Shelf, Gulf of Mexico, coarse sand bottom at 130 m depth.

Remarks. This is the second record of the species, after Schmidt’s (1870) description from the Gulf of Mexico (see Alvarez et al. 1998: 15).

So far, no type specimen of this species has been positively identified and redescribed. A possible type specimen has been recently found in the BMNH collection (Ms Emma Sherlock in litteris), labeled ‘ Cometella gracilior  n.g. n.sp. Alligator Reef, BMNH 1939:2:10:45 (sp) MCZ Exchange ( MCZ 8130)’. It has the shape of Schmidt’s pl. IV fig. 9, and in all probability is not ‘ Cometella gracilior  ’ (= Asbestopluma (A.) gracilior  , see above), but possibly the type of Rhizaxinella clava  .

RMNH

National Museum of Natural History, Naturalis

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Hadromerida

Family

Suberitidae

Genus

Rhizaxinella

Loc

Rhizaxinella clava ( Schmidt, 1870 )

Van, Rob W. M. 2017
2017
Loc

Rhizaxinella clava

Rutzler 2009: 297
Alvarez 1998: 15
1998
Loc

Axinella clava

Schmidt 1870: 61
1870