Hymerhabdia kobluki, Van, Rob W. M., 2017

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 118-119

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

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scientific name

Hymerhabdia kobluki

sp. nov.

Hymerhabdia kobluki  sp. nov.

Figures 72View FIGURE 72 a –e

Hymerhabdia  sp. Kobluk & Van Soest 1989: 1215.

Material examined. Holotype RMNH Por. 9844, Guyana, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station H57, 7.595°N 56.8767°W, depth 94 m, bottom coarse sand shells, 11 May 1966GoogleMaps  .

Additional material. ZMA Por. 12584, Caribbean Netherlands, Bonaire, W coast N and S of Kralendijk , 12.15°N 68.278°W, framework cavities, depth 24–30 m, coll. D.R. Kobluk #BO-84-12, 1988GoogleMaps  ; ZMA Por. 22017, Colombia, Cartagena, Islas del Rosario, Isla Pavitos  , SCUBA, 25 m depth, coll. M. Kielman #82, 11 October 1990.

Description. ( Fig. 72View FIGURE 72 a) Microlobate sponge encrusting a piece of limestone. The small lobes are separated by thin grooves. Surface microhispid, no oscules are visible (preserved state, likely contracted). Lateral expansion about 3 x 2 cm, thickness 2–3 mm. Color (in alcohol) dull yellow to beige (probably orange in life, because the additional Colombian specimen ZMA Por. 22017 was reported to be orange in life). Consistency firm.

Skeleton. ( Fig. 72View FIGURE 72 b) The small lobes are V-shaped, dense masses of erect styles, heads buried in a lateral, confused, mass of oxeas. No special ectosomal skeleton.

Spicules. ( Figs 72View FIGURE 72 c –e) Styles, oxeas.

Styles ( Figs 72View FIGURE 72 c –d), straight or slightly curved, predominantly just below the head, in a large range of length and thickness, incompletely sorted into (1) larger thick styles ( Figs 72View FIGURE 72 c,c1) 632–1176 x 12–36 µm, (2) short thick styles 498–570 x 24–31 µm, and (3) short thin styles ( Fig. 72View FIGURE 72 d1) 264–387 x 9–18 µm, presumed to be thin growth stages. Overall size of styles 264– 736 – 1176 x 9 – 24.1 –36 µm.

Oxeas ( Figs 72View FIGURE 72 e,e1), mostly provided with a sharp bend in the middle or slightly excentrally, usually sharply pointed at both ends, but strongylote forms are present, 264– 424 –601 x 9 – 14.9 –19 µm.

Distribution and ecology. Guyana Shelf, Bonaire, Colombian Caribbean, in reef caves at 24–30 m depth ( Kobluk & Van Soest 1989) and on sandy bottom at 94 m depth ( Guyana Shelf).

Etymology. Named after the late Professor D.R. Kobluk of the University of Toronto Mississauga, who collected the first specimen of the species from Bonaire.

Remarks. This species was previously reported by Kobluk & Van Soest (1989) from Bonaire  . Apart from this find, Hymerhabdia  species have so far not been reported from the Central West Atlantic. The genus is known mostly from the Mediterranean-Atlantic region , with a single species, H. oxeata ( Dendy, 1924)  (p. 349, originally as Bubaris oxeata  ) recorded from Northern New Zealand  . This species shows considerable similarity with the present new species, virtually the only difference being the smaller size of the oxeas, given as 270 x 12 µm by Dendy, remeasured later by Alvarez & Van Soest (2002) as 180–310 x 5–10 µm. The structure and the great size range of the styles is almost exactly that of the Guyana species  . The New Zealand species was made the type of the genus Uplexoa De Laubenfels, 1936  , subsequently synonymized with Hymerhabdia  by Alvarez & Van Soest (2002) (p. 752). Because now two species with closely similar properties are found to exist it might be in order to revive the genus Uplexoa  . 


National Museum of Natural History, Naturalis


Universiteit van Amsterdam, Zoologisch Museum














Hymerhabdia kobluki

Van, Rob W. M. 2017


Kobluk 1989: 1215