Iotrochota birotulata ( Higgin, 1877 ),

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 143-144

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/03A80010-77D9-FF23-FF14-A07691FBFD57

treatment provided by

Plazi

scientific name

Iotrochota birotulata ( Higgin, 1877 )
status

 

Iotrochota birotulata ( Higgin, 1877) 

Figures 89View FIGURE 89 a –f

Restricted synonymy:

Halichondria birotulata Higgin, 1877: 296  , pl. 14 figs 11–15.

Iotrochota birotulata  ; Ridley 1884: 443; Van Soest 2002: 598, with further synonyms); Rützler et al. 2007c: 175, figs. 1–3.

Material examined. RMNH Por. 9940, Guyana, ‘Luymes’ Guyana Shelf Expedition, station 63, 7.5833°N 57.0667°W, depth 71 m, sandy bottom, 31 August 1970GoogleMaps  .

Description. Two ramose fragments ( Fig. 89View FIGURE 89 a), each about 4 cm long and 0.6–2 cm wide. Surface conulose, with an oscule of 3 mm in diameter. Color greyish black in alcohol. Consistency soft, fragile.

Skeleton. Thick spongin-enforced spicule tracts, 70–200 µm in diameter, cored by 20–30 spicules form a reticulation with elongately squarish meshes of 300–500 x 200–300 µm. No special ectosomal skeleton.

Spicules. ( Figs 89View FIGURE 89 b –f) Styles, strongyles, birotules.

Styles, smooth straight, with conical pointed end, occurring in a longer/thinner category ( Fig. 89View FIGURE 89 b,b1), 232– 262 –284 x 3 – 4.6 –6 µm, and a thicker/shorter category ( Fig. 89View FIGURE 89 c), 178– 184 –192 x 7 – 9.0 –10 µm.

Strongyles, curved, smooth, variably in size and thickness, thicker ( Fig. 89View FIGURE 89 d) and thinner ( Fig. 89View FIGURE 89 e,e1) spicules about equally long, 138– 182 –202 x 2 – 5.4 –7.5 µm.

Birotules ( Fig. 89View FIGURE 89 f), straight shaft, usually about 12 alae, quite uniform in size, 15– 16.2 –18 µm.

Distribution and ecology. Guyana Shelf, Greater Caribbean, NE Brazil, on various bottoms at 0.1–90 m depth ( Guyana Shelf 71 m).

Remarks. The specimen keys out in Rützler et al. ’s 2007b key as I. birotulata  , having branching habitus and possessing birotules..

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Poecilosclerida

Family

Iotrochotidae

Genus

Iotrochota

Loc

Iotrochota birotulata ( Higgin, 1877 )

Van, Rob W. M. 2017
2017
Loc

Iotrochota birotulata

Rutzler 2007: 175
Ridley 1884: 443
1884
Loc

Halichondria birotulata

Higgin 1877: 296