Chelonaplysilla americana, Van, Rob W. M., 2017

Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 17-18

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/03A80010-7747-FFBD-FF14-A1B994CFFDA7

treatment provided by

Plazi

scientific name

Chelonaplysilla americana
status

sp. nov.

Chelonaplysilla americana  sp. nov.

Figures 8View FIGURE 8 a –b

Chelonaplysilla erecta sensu Van Soest 1978: 71  , pl. XIV fig. 1, text-fig. 24; Zea 1987: 50, Pl. 6 fig. 4; Hajdu et al. 2011: 218, with unnumbered figures; Moraes 2011: 201, with unnumbered figures; Muricy et al. 2011: 54.

Not: Megalopastas erectus Row, 1911  ; nec: Chelonaplysilla erecta Tsurnamal, 1967  .

Material examined. Holotype RMNH Por. 9812, Suriname, ‘ Snellius O.C.P.S. ’ Guyana Shelf Expedition, station F41, 6.9133°N 56.4767°W, depth 55 m, Agassiz trawl, 6 May 1966GoogleMaps  .

Description. Conulose cushion ( Fig. 8View FIGURE 8 a), size 3 x 2 x 0.5 cm. Color (in alcohol) dark purple, internal color darker, almost black. Surface provided with the characteristic sand grain reticulation, between conules of 2 mm high and 3–4 mm diameter. Fibers protruding from the apices of the conules. Several rimmed oscules are present, with diameter 2–3 mm.

Skeleton. Surface reticulation ( Fig. 8View FIGURE 8 b) of tracts composed of sand particles and spicule fragments, 40–70 µm in thickness, enclosing pore fields 110–240 µm in diameter. Dendritic fibers, growing out of a basal plate of spongin. Fibers divide sparingly at the base, but more prolific at the surface, length 2.5–4.5 mm, thickness at the base up to 160 µm diameter tapering towards the surface to about 30 µm diameter. Fibers dark purple in color, pithed and laminated.

Distribution and ecology. From shallow water mangroves and reefs down to 55 m depth (previously down to 50 m).

Etymology. The name reflects its distribution in the seas surrounding the eastern coast of both Americas.

Remarks. The species has already been extensively described by Van Soest (1978), Zea (1987), Hajdu et al. (2011) and Muricy et al. (2011). The name Chelonaplysilla erecta sensu Tsurnamal, 1967  was chosen for it by Van Soest (1978), who noted the similarity with Tsurnamal’s description of his Eastern Mediterranean species (cushion shaped and with ramified fibers), as opposed to thinly encrusting shape and single undivided fibers in the type of Chelonaplysilla  , the deep-water Atlantic species C. noevus ( Carter, 1876)  . Subsequently, Zea (1987) pointed out that according to Bergquist (1980) (p. 486) Tsurnamal’s C. erecta  was synonymous with the Red Sea species Megalopastas erectus Row, 1911  , and reassigned the present species to C. erecta ( Row, 1911)  . Later authors followed Zea’s decision and ignored the unlikely synonymy of a southern Red Sea species with a species from the tropical West Atlantic.

A second Central West Atlantic species of Chelonaplysilla  is the yellow C. betinensis Zea & Van Soest, 1986  from the Colombian Caribbean. Apart from being yellow it is thinner and has less long fibers.

RMNH

National Museum of Natural History, Naturalis

Kingdom

Animalia

Phylum

Porifera

Class

Demospongiae

Order

Dendroceratida

Family

Darwinellidae

Genus

Chelonaplysilla

Loc

Chelonaplysilla americana

Van, Rob W. M. 2017
2017
Loc

Chelonaplysilla erecta sensu

Zea 1987: 50
Van 1978: 71
1987