Crella (Pytheas) chelifera Van Soest, 1984,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 138-139

publication ID 10.5281/zenodo.272951

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Crella (Pytheas) chelifera Van Soest, 1984


Crella (Pytheas) chelifera Van Soest, 1984 

Figures 85View FIGURE 85 a –f

Material examined. RMNH Por. 10544, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station B23A, 7.297°N 55.3883°W, depth 99–101 m, Van Veen grab, 27 April 1966GoogleMaps  .

Description. Small patches on dead bryozoans, together only a few mm 2 in size. Surface smooth, no openings were observed. Color (alcohol) whitish.

Skeleton. Ectosomal tangential skeleton ( Fig. 85View FIGURE 85 a) of tightly packed acanthoxeas, carried by bundles of tornotes, towards the substratum replaced by long acanthostyles. Bundles echinated by small acanthostyles. Chelae scattered in the interior and occasionally occurring in the surface crust.

Spicules. ( Figs 85View FIGURE 85 b –f) Acanthostyles, tornotes, acanthoxeas, isochelae.

Acanthostyles, in two size classes, (1) long, ( Figs 85View FIGURE 85 b,b1) straight, spined heavily in the upper part, but more lightly towards the pointed end, 243– 277 –330 x 9 – 10.8 –13 µm, and (2) short ( Fig. 85View FIGURE 85 c), stubby, spined all over, 72– 95 –111 x 6.5– 8.2 –9 µm.

Tornotes ( Figs 85View FIGURE 85 d,d1), smooth, slightly different endings on opposite sides, faintly polytylote, 236– 291 –327 x 4.5– 5.7 –7.5 µm.

Acanthoxeas ( Fig. 85View FIGURE 85 e), straight or slightly curved, heavily and uniformly spined, 112– 137 –159 x 5 – 7.4 –9 µm.

Arcuate isochelae ( Fig. 85View FIGURE 85 f), rather narrow, with slightly incurved alae, 28– 30.9 –35 µm.

Distribution and ecology. Guyana Shelf, Barbados, on muddy sand at 90–101 m depth.

Remarks. There are a few small differences between the description of the type from Barbados and the present specimen (megascleres are somewhat thinner in the type, chelae are smaller, 19–24 µm), but overall similarity is great and conspecificity obvious. 


National Museum of Natural History, Naturalis