Parahigginsia cf. strongylifera Van Soest, Meesters & Becking, 2014,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 56-58

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/03A80010-7760-FF96-FF14-A42E9466FE12

treatment provided by

Plazi

scientific name

Parahigginsia cf. strongylifera Van Soest, Meesters & Becking, 2014
status

 

Parahigginsia cf. strongylifera Van Soest, Meesters & Becking, 2014 

Figures 37View FIGURE 37 a –d

Parahigginsia strongylifera Van Soest et al. 2014: 423  , figs 14–15.

Material examined. RMNH Por. 9882b, Suriname, ‘Luymes’ Guyana Shelf Expedition, station 1, 7.1667°N 53.5833°W, depth 104–130 m, bottom sandy calcarenite, 24 August 1970GoogleMaps  .

Description. ( Fig. 37View FIGURE 37 a) Pale orange crust (in alcohol) on a specimen of Characella poecillastroides  (cf. below). Surface wavy to microlobate, but otherwise smooth, no apparent oscules (presumably contracted). Overall size 7 x 4 cm, thickness about 2 mm. Consistency soft.

Skeleton. ( Fig. 37View FIGURE 37 b) An isotropic but confused unispicular to paucispicular reticulation of oxeas. At the surface there is a thin crust of acanthomicroxeas.

Spicules. ( Figs 37View FIGURE 37 c –d) Oxeas, acanthomicroxeas.

Oxeas ( Fig. 37View FIGURE 37 c), lightly curved, robust, cigar-shaped, with mucronate apices, occasionally with one of the ends rounded, style-like, 171– 196 –204 x 9 – 11.1 –14 µm.

Acanthomicroxeas ( Figs 37View FIGURE 37 d,d1), thin, curved or straight, with thin, long, sharp spines, evenly distributed, 74– 83.3 –102 x 0.5– 1.1 –2 µm.

Distribution and ecology. Guyana Shelf, Bonaire (if conspecific), encrusting hard substrates including sponges, at 104–238 m depth.

Remarks. The identification is made with hesitation. There are differences with the type material from Bonaire ( RMNH Por. 9251): the strongyles which are the basis of the species name are replaced by oxeas in the present specimen, which are also shorter than the strongyles of the type  . The type material consists of small pale blueish patches on deep-water rocks, whereas the present specimen forms a larger sheet encrusting a rough deepwater sponge. However, the preserved fragments of the type material (Van Soest et al. 2014: fig. 14c) and the encrustations reported here are remarkably similar in shape and color. Thinner growth stages of the type are oxealike (Van Soest et al. 2014: fig. 14d), so it is likely that the strongyles may be considered modified oxeas, the more so as the only other species of Parahigginsia  ( P. phakelloides Dendy, 1924  ) also has oxeas. The acanthomicroxeas of both are similar in size and shape, sharing the characteristic thin sharp spines.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Halichondrida

Family

Heteroxyidae

Genus

Parahigginsia

Loc

Parahigginsia cf. strongylifera Van Soest, Meesters & Becking, 2014

Van, Rob W. M. 2017
2017
Loc

Parahigginsia strongylifera

Van Soest et al. 2014: 423
2014