Dragmaxia undata Alvarez, Van Soest & Rützler, 1998,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 50-51

publication ID

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

publication LSID

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

DOI

http://doi.org/10.5281/zenodo.3510914

persistent identifier

http://treatment.plazi.org/id/03A80010-7766-FF9E-FF14-A4229344F8CD

treatment provided by

Plazi

scientific name

Dragmaxia undata Alvarez, Van Soest & Rützler, 1998
status

 

Dragmaxia undata Alvarez, Van Soest & Rützler, 1998 

Figures 32View FIGURE 32 a –c

Dragmaxia undata Alvarez, Van Soest & Rützler, 1998: 26  , fig. 15; Rützler et al. 2014: 71 View Cited Treatment .

Material examined. RMNH Por. 9821, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station E66, 7.1°N 56.1783°W, depth 65 m, Agassiz trawl, 13 May 1966GoogleMaps  .

Description. Erect digitations ( Fig. 32View FIGURE 32 a) on a cushion-shaped basis attached to a dead shell. Height of specimen 4 cm, dimensions of the two digitations 1–1.5 cm high and 0.5 cm diameter. Surface irregular, encrusted with bryozoans, microhispid, semitransparent, whitish-yellowish in color (alcohol preserved). Consistency firm.

Skeleton. This consists of largely confused single styles, but vague tracts of spicules are directed upwards into the digitations. Styles partially penetrate the surface. No visible spongin. Many open spaces. Straight, or more frequently, wavy trichodragmas are numerous between the styles.

Spicules. ( Figs 32View FIGURE 32 b –c) Styles, trichodragmas.

Styles ( Fig. 32View FIGURE 32 b,b1), slightly to strongly curved, seldom straight, more or less equidiametrical over much of their length, sharply pointed, 690– 893 – 1046 x 13 – 19.2 –26 µm.

Trichodragmas ( Figs 32View FIGURE 32 c,c1), curved and wavy, seldom straight, raphides provided at both ends with one or two hook-like spines ( Fig. 32View FIGURE 32 c1), 184– 220 –258 x 4 – 6.4 –9 µm.

Distribution and ecology. Guyana Shelf, Curaçao, Bonaire, Colombian Caribbean, Belize, in cryptic reef habitats and at greater depth on shelly slopes, at 0.5–65 m depth (previously down to 35 m).

Remarks. The present specimen differs in shape from the type material and from the Belize material, as these were basically encrusting. However, the digitate shape clearly developed from an encrusting base, so it may merely represent a more developed form in a habitat with less competition. Spicule shapes and sizes conform closely to the type material. The Belize material apparently had trichodragmas up to 600 µm, considerably longer than trichodragmas in the type material and the Guyana material.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Halichondrida

Family

Axinellidae

Genus

Dragmaxia

Loc

Dragmaxia undata Alvarez, Van Soest & Rützler, 1998

Van, Rob W. M. 2017
2017
Loc

Dragmaxia undata Alvarez, Van Soest & Rützler, 1998 : 26

Rutzler 2014: 71
Alvarez 1998: 26
2014