Thyonella sabanillaensis ( Deichmann, 1930 )

Martins, Luciana, 2018, Taxonomy of the genus Thyonella (Holothuroidea: Dendrochirotida), with mention of the first record of T. sabanillaensis from the southwestern Atlantic Ocean, Zootaxa 4527 (1), pp. 75-86 : 78-79

publication ID

https://doi.org/ 10.11646/zootaxa.4527.1.6

publication LSID

lsid:zoobank.org:pub:E8ECF9B8-AEB9-4507-84F0-47BF369A7A6B

DOI

https://doi.org/10.5281/zenodo.5945973

persistent identifier

https://treatment.plazi.org/id/5D1A87D7-9674-FFC0-FF50-FA62F5A9FC54

treatment provided by

Plazi

scientific name

Thyonella sabanillaensis ( Deichmann, 1930 )
status

 

Thyonella sabanillaensis ( Deichmann, 1930) View in CoL

( Figs. 3–4 View FIGURE 3 View FIGURE 4 )

Thyone sabanillaensis Deichmann, 1930: 178 View in CoL –179, plate 16, figs 4–9

Thyonacta View in CoL sabanillaensis— Deichmann, 1941: 101

Thyonella sabanillaensis— Deichmann, 1954, 399

Thyonella View in CoL sabanillaensis— Cherbonnier, 1957: 537 –540, fig. 1.

Thyonella View in CoL sabanillaensis— Miller & Pawson, 1984: 25 –27, figs. 17, 18.

Material examined. Brazil: Espirito Santo, Piúma , 30. X. 1966, depth unknown, 1 spm, 80 mm (EH-IBZ/ UFRJ 144 ) . United States: Florida, 23. viii. 1971, 6 m, 1 spm, 150 mm ( USNM E22336) ; French Guiana, 6. xi.1955, 1 spm, 80 mm ( MNHN 3329 About MNHN ) .

Type locality. Sabanilla , Colombia ( Deichmann, 1930) .

Distribution. Gulf of Mexico, Colombia, French Guiana (WoRMS, 2018) and Southwestern Brazil, Espirito Santo (present paper). Bathymetric range: currently known to inhabit quartz and shell bottoms, covered with algae mostly between 4 and 30 m ( Miller & Pawson, 1984).

Diagnosis. Tube feet papilliform distributed along the ambulacra in two rows and scattered in the interambulacra (mainly in the middle of body). Body wall ossicles include deep cups; four-holed knobbed buttons; knobbed and smooth plates. Introvert ossicles are rosettes. The tentacles hold rods.

Description. Body U-shaped, rough to touch ( Fig. 3A, D, E View FIGURE 3 ). Color brownish in ethanol. Tube feet distributed along the ambulacra in two rows and scattered in the interambulacra (middle of body). Anal papillae present. Stone canal short and madreporite circular ( Fig. 3B View FIGURE 3 ). Calcareous ring with short posterior processes; radial and interradial plates entire and equal in length; radial plates notched; interradial plates entire, narrowing anteriorly ( Fig. 3C, F View FIGURE 3 ).

Body wall ossicles comprise four-holed knobbed buttons (40–80 µm long, Fig. 4A View FIGURE 4 ); smooth perforated plates, irregular in outline (80–300 µm long, Fig. 4B View FIGURE 4 ); perforated plates with spherical knobs (80–220 µm long, Fig. 4 View FIGURE 4 C– D) and deep cups (40–60 µm long, Fig. 4 View FIGURE 4 E–F). Introvert with buttons (20–60 µm long, Fig. 4G View FIGURE 4 ). Tentacles with two types of perforated rods present: i) flat and elongated (200–400 µm long, Fig. 4H View FIGURE 4 ) and ii) flat and irregular in outline (200–400 µm long, Fig. 4I View FIGURE 4 ). Tube feet with curved supporting rods (200–300 µm long, Fig. 4J View FIGURE 4 ) in papillae triangular plates (200–400 µm long Fig. 4K View FIGURE 4 ) end plate absent. Anal region with large perforated plates (500–700 µm long Fig. 4L View FIGURE 4 ).

Remarks. Thyonella sabanillaensis was previously known only from the Gulf of Mexico to French Guiana and it is reported here for the first time from the Southwestern Atlantic ( Brazil, Espírito Santo ~21° S). The specimens herein identified as T. sabanillaensis agree with the description provided by Deichmann (1930) except in the composition of the introvert ossicles. Deichmann (1930) did not comment on the composition of introvert ossicles. However, Deichmann (1954) described rosettes in the introvert. In the material examined, rosettes have not been not found, but buttons are present.

The differences observed between specimens from Brazil and French Guiana were in relation to the morphology of the calcareous ring. In the specimen from French Guiana, plates of the calcareous ring are slightly broader ( Fig. 3F View FIGURE 3 ) than plates from the material examined herein ( Fig. 3 C View FIGURE 3 ). No significant differences were observed between specimens from Brazil and Florida.

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Echinodermata

Class

Holothuroidea

Order

Dendrochirotida

Family

Cucumariidae

Genus

Thyonella

Loc

Thyonella sabanillaensis ( Deichmann, 1930 )

Martins, Luciana 2018
2018
Loc

Thyonella

Miller, J. E. & Pawson, D. L. 1984: 25
1984
Loc

Thyonella

Cherbonnier, G. 1957: 537
1957
Loc

Thyonacta

Deichmann, E. 1941: 101
1941
Loc

Thyone sabanillaensis

Deichmann E. 1930: 178
1930
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