Amphiodia planispina
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Ordo: Ophiurida
Familia: Amphiuridae
Genus: Amphiodia
Name
Amphiodia planispina (von Martens, 1867) – Wikispecies link – Pensoft Profile
Description
Disk circular (dd= 4.46 to 5.80 mm). Covered by numerous small and imbricating scales (Fig. 4a). Radial shields slightly longer than wide, with external margin convex and internal margin straight, united except at proximal ends, where one or two small triangular and elongate scales separate them (Fig. 4a). Ventral interradius covered by scales slightly smaller than dorsal scales (Fig. 4b). Bursal slits narrow. Oral shields arrow-shaped (Fig. 4c). Madreporite with one or two pores at distal margin. Adoral shields narrow and enlarged laterally. Two oral papillae at each side of jaw angle, distal one longer and broader (Fig. 4c). Infradental papillae small. Dorsal arm plate broader than long, rectangular (Fig. 4d). Ventral arm plate pentagonal, wider than long, with a slight notch in distal margin. Three arm spines enlarged, compressed and blunt, the ventral one being the longest (Fig. 4e). Two small, perpendicular, tentacle scales.
Distribution
Florida, the islands off southern Florida, the Antilles, Panama Brazil, and off Mar del Plata, Argentina (Tommasi 1970[1], Bernasconi and D’Agostino 1977[2], Hendler et al. 1995[3], Alvarado et al. 2008[4]). In Brazil from Maranhão, Ceará, Rio Grande do Norte, Paraíba (Albuquerque 1986[5]), Bahia (Thomas 1962[6], Magalhães et al. 2005[7]), Espírito Santo (Albuquerque and Guile 1991[8]), Rio de Janeiro (Von Martens 1867[9], type locality) and São Paulo (Tommasi 1970[1]). Depth 0-300 m. In the present study collected between 11 and 27m.
Remarks
This species is known from bottoms of sand, mud, gravel and algae (Tommasi 1970[1]). It is found burrowed in the sediment together with other ophiuroids such as Ophiophragmus pulcher H.L. Clark, 1918 and Amphioplus albidus (Ljungman, 1867) in Florida and Hemipholis elongata (Say, 1825) in Brazil (Hendler et al. 1995[3]). Thomas (1962)[6] showed that the shape of the arm spines (compressed and blunt) and the noncontiguous adoral shields are important characters to separate Amphiodia planispina from the other more closely related species such as Microphiopholis atra (Stimpson, 1854). Thomas (1962)[6] remarked that these morphological characters may not be present in all specimens, as was also observed by us. The specimens observed in this study differed from the description provided by Tommasi (1970)[1] only in relation to the number of scales between the radial shields. The specimens (dd = 8.5 mm) analized by Tommasi showed two to seven scales between the radial shields, while the specimens of this study (dd = 5.80 mm) had one or two scales. This fact is probably related to size of the specimens of both studies.
Taxon Treatment
- Gondim, A; Alonso, C; Dias, T; Manso, C; Christoffersen, M; 2013: A taxonomic guide to the brittle-stars (Echinodermata, Ophiuroidea) from the State of Paraíba continental shelf, Northeastern Brazil ZooKeys, 307: 45-96. doi
Other References
- ↑ 1.0 1.1 1.2 1.3 Tommasi L (1970) Os ofiuróides recentes do Brasil e de regiões vizinhas. Contribuições do Instituto Oceanográfico, Universidade de São Paulo Série Oceanografia Biológica 20: 1–146. doi: 10.1590/S0373-55241971000100001
- ↑ Bernasconi I, D’Agostino M (1977) Ofiuroideos del mar epicontinental Argentino. Revista del Museo Argentino de Ciencias Naturales ¨Bernardino Rivadavia¨ Hidrologia 5: 65-114.
- ↑ 3.0 3.1 Hendler G, Miller J, Pawson D, Kier P (1995) Sea stars, sea urchins and allies: echinoderms of Florida and the Caribbean. Smithsonian Institution Press, Washington, 390 pp.
- ↑ Alvarado J, Solís-Marin F, Ahearn C (2008) Echinoderms (Echinodermata) from Central America Caribbean. Revista de Biologia Tropical 56: 37-55.
- ↑ Albuquerque M (1986) Ophiuroidea Gray, 1840 (Echinodermata) da plataforma continental do norte e nordeste brasileiro. PhD thesis, São Paulo: University of São Paulo.
- ↑ 6.0 6.1 6.2 Thomas L (1962) The shallow water Amphiurid brittle stars (Echinodermata, Ophiuroidea) of Florida. Bulletin of Marine Science of the Gulf and Caribbean 12: 623-694.
- ↑ Magalhães W, Martins L, Alves O (2005) Inventário dos Echinodermata do Estado da Bahia. Brazilian Journal of Aquatic Science and Technology 9: 61-65.
- ↑ Albuquerque M, Guille A (1991) Ophiuroidea (Echinodermata) ao largo do Brasil: Banco dos Abrolhos, Cadeia Submarina Vitória-Trindade e Plataforma Continental adjacente. Boletim do Museu Ncional, Nova Série, Zoologia (353): 1–29.
- ↑ Martens E (1867) Über vier neue Schlangensterne, Ophiuren, des Kgl. zoologischen Museums. Monatsberichte der deutschen Akademie der Wissenschaften zu Berlin1867: 345–348.
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