Plakortis insularis Moraes & Muricy, 2003,

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 193-194

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/03A80010-7797-FF6D-FF14-A5CF95FAFA5D

treatment provided by

Plazi

scientific name

Plakortis insularis Moraes & Muricy, 2003
status

 

Plakortis insularis Moraes & Muricy, 2003 

Figures 122View FIGURE 122 a –c

Plakortis insularis Moraes & Muricy, 2003: 389  , fig. 5; Moraes 2011: 68, several unnumbered figs.

Material examined. RMNH Por. 9852, 9917, Suriname, ‘ Luymes O.C.P.S. II’ Guyana Shelf Expedition, station M97, 7.3083°N 54.1667°W, depth 130 m, bottom coarse sand, 16 April 1969GoogleMaps  ; RMNH Por. 9870, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station F45, 6.4417°N 56.5467°W, depth 34 m, Van Veen grab, 7 May 1966GoogleMaps  .

Description. ( Fig. 122View FIGURE 122 a) Lobate masses with smooth surface. Size of largest specimen 7 x 3 x 3 cm. Color (in alcohol) orange-brown. Consistency firm, corky.

Skeleton. At the surface there are rounded openings of 100–150 µm surrounded and subdivided into smaller openings by groups of perpendicular diods. Choanosome alveolar, with meshes of 30–40 µm diameter.

Spicules. ( Figs 122View FIGURE 122 b –c) Diods, triods.

Diods ( Figs 122View FIGURE 122 b), in a large size range, many are curved; they are possibly divisible in (1) larger 81–129 µm, and (2) smaller 11–28 µm spicules; overall sizes 11– 55 –129 x 0.5– 2.4 –6.5 µm.

Triods ( Figs 122View FIGURE 122 c), mostly equiactinal, actines 10– 31.9 – 38 x 1.5– 3.4 –4.5 µm (‘cladomes’ 22–61 µm).

Distribution and ecology. Guyana Shelf, NE Brazil, 1–130 m depth (previously 1–12 m).

Remarks. Of all the Plakortis simplex  -like Central West Atlantic species, the specimens match closest with P. insularis  . Using the key in Ereskovsky et al. (2014), likewise P. insularis  comes out at the most likely match. The ectosome of my specimens is distinctly reticulate, which distinguishes it from P. edwardsi Ereskovsky, Lavrov & Willenz, 2014  . The diods are very variable in size, but do not seem to be readily divisible in two distinct size categories such as found in P. dariae Ereskovsky, Lavrov & Willenz, 2014  . From P. zyggompha ( De Laubenfels, 1936)  the present specimens differ in having larger diods (these are only up to 59 µm in the type of P. zyggompha  ). All these species are very similar and further research is necessary to establish whether they are all valid species.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Homoscleromorpha

Order

Homosclerophorida

Family

Plakinidae

Genus

Plakortis

Loc

Plakortis insularis Moraes & Muricy, 2003

Van, Rob W. M. 2017
2017
Loc

Plakortis insularis

Moraes 2003: 389
2003