A new species of Havelockia Pearson, 1903 from the Argentine Sea (Holothuroidea: Dendrochirotida: Sclerodactylidae)

Martínez, Mariano Ignacio; Thandar, Ahmed S.; Penchaszadeh, Pablo E.

doi:10.11646/zootaxa.3609.6.3

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…Three species from the Western Atlantic are recognized. The new species differs from H. scabra in having four-holed body wall tables ( vs multilocular), and from H. mansoae and H. pegi Martinez, Thandar & Penchaszadeh, 2013 mainly by the types of introvert ossicles (see Table 1).…”

Section: Resultsmentioning

confidence: 88%

Taxonomic remarks onHavelockiaandThyone(Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

Martins

Souto

2018

J. Mar. Biol. Ass.

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Thyone and Havelockia are worldwide-distributed genera represented in the Western Atlantic by eight and three species, respectively. In this paper, we describe two new shallow-water species from the Brazilian coast: Thyone waltinhoi sp. nov. and Havelockia oraneae sp. nov. These genera are very similar morphologically but the presence of subdivisions in their calcareous rings separates them into different families, Thyone in Phyllophoridae and Havelockia in Sclerodactylidae. To observe the presence of subdivisions, we submerged the calcareous rings in an iodine solution prior to morphological analyses. Thyone waltinhoi sp. nov. differs from its Western Atlantic congeners in its dermal ossicles and Havelockia oraneae sp. nov. differs from its South-western Atlantic congeners in the composition of its introvert ossicles. In addition to species descriptions, illustrations and morphological diagnoses of both genera are provided, along with a synoptic table of their Western Atlantic species, and a discussion of the taxonomic significance of the dermal ossicles and the calcareous ring.

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Section: Resultsmentioning

confidence: 88%

Taxonomic remarks onHavelockiaandThyone(Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

Martins

Souto

2018

J. Mar. Biol. Ass.

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“…In this water mix region (Ramírez 1996), we can find species from southern waters like the sea cucumber Hemioedema spectabilis and species from temperate waters like the brittle star Ophioplocus januarii. Also, the recent described species Havelockia pegi and Chiridota pisanii, which are distributed in temperate and cold waters from Patagonia and Buenos Aires Province, were found in San Matías Gulf (Pawson 1969;Hernández 1981;Martinez et al 2013). In particular, C. pisanii is also at the magellanic area and gives evidence about the influence of southern waters in San Matías Gulf.…”

Section: Discussionmentioning

confidence: 91%

“…Relatively few studies have been conducted about the echinoderms of San Matías Gulf, including the classes Asteroidea, Echinoidea, Ophiuroidea, and Holothuroidea (Bernasconi 1953(Bernasconi , 1964(Bernasconi , 1966(Bernasconi , 1973(Bernasconi , 1980Bernasconi and D'Agostino 1971, 1974, 1975, 1977Escofet et al 1978;Brogger et al 2013a;Martinez et al 2013), but without reports of Crinoidea. A recent publication has removed the only reported endemic ophiuroid from Argentina Amphilepis sanmatiensis and treated it as a synonym of Amphioplus lucyae (Brogger and O'Hara 2015).…”

Section: Introductionmentioning

confidence: 99%

Echinoderms in San Matías Gulf, Southwestern Atlantic Ocean

2016

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Echinoderms are often of ecological importance in intertidal and subtidal waters, especially as predators and herbivores but also as prey. Several groups of echinoderms respond in a different way to environmental variables, contributing to some of the biodiversity patterns found along latitudinal gradient. This work listed the echinoderms species of San Matías Gulf surrounding the coast of Río Negro Province and analyzed the current state of knowledge of this group by previous works, collection items of the Museo Argentino de Ciencias Naturales BBernardino Rivadavia,â nd from samples taken since 2009 to the present. A total of 35 species of echinoderms corresponding to four classes were recorded. The 34.29 % corresponds to Asteroidea, 31.43 % to Ophiuroidea, 20 % to Echinoidea, and 14.28 % to Holothuroidea. Crinoidea has not been reported for San Matías Gulf. Asteroidea and Ophiuroidea were the most representative groups followed by Echinoidea and Holothuroidea, with only five species in the last class. About 30 % of the country's species are present in Río Negro Province. This high number of species may be due to the heterogeneity of environments that are possible to find in San Matías Gulf and a transition zone between the Magellanic and Argentine biogeographic provinces that can provide particular physical and climatic characteristics explaining as consequence the faunal composition.

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“…As letras P, S e C indicam Phyllophoridae, Sclerodactylidae e Cucumariidae, respectivamente (adaptado de Lacey et al, 2005). Uma vez que os limites entre Phyllophoridae e Sclerodactylidae não estão bem definidos, a validade da família Sclerodactylidade tem sido questionada por alguns autores (e.g., Thandar, 1989, Thandar & Arumugam, 2011, Martinez et al, 2013. De fato, enquanto a maioria das famílias exibe uma composição particular de ossículos dérmicos, bem como da morfologia do anel calcário, Sclerodactylidae exibe espécies com caracteres relacionados às espécies de Phyllophoridae.…”

Section: * Nenhuma Das Propostas Utilizou Metodologia Cladisticaunclassified

Filogenia morfológica das famílias Phyllophoridae e Sclerodactylidae (Echinodermata: Holothuroidea: Dendrochirotida)

Martins¹

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Currently, the order Dendrochirotida comprises about 800 species, half of these being within the families Sclerodactylidae and Phyllophoridae. Regardless, most information about these families is from old morphological revisions (Phyllophoridae in 1954 and Sclerodactylidae not reviewed). This study appears as the first formal test of the monophyly of the families Sclerodactylidae and Phylllophoridae and their respective subfamilies. The present work constituted a detailed morphological study of the structures that compose the Holothuroidea endoskeleton which are the dermal ossicles and calcareous ring to achieve through a cladistic analysis the following objectives: (i) to test the monophyly of Phyllophoridae; (ii) to test the monophyly of Sclerodactylidae; (iii) to test the monophyly of the Phyllophoridae subfamilies and iv) to test the monophyly of the subfamilies of Sclerodactylidae. The material studied was obtained from visits and/or loans from the national and international museums. Specimens of all orders of Holothuroidea were analyzed with the exception of Elasipodida, yielding 956 specimens belonging to 78 species, of which four were delimited as outgroups (i.e. Aspidochirotida, Apodida and Dendrochirotida [Cucumariidae and Psolidae]) and 44delimited as internal groups (all type specimens were analyzed). A total of 72 morphological characters were described and illustrated through photographs or scanning electron microscopy images. The analyses were conducted with the aid of PAUP (v.4.0) using a parsimony algorithm Tree Bisection and Reconnection (TBR) branch-swapping (5000 replicates). This detailed morphological study allowed us to list new characters, to reinterpret. already established ones as well as providing corrections of misinterpretations about such structures. Sclerodactylidae was recovered as monophyletic and is composed of three subfamilies (all were recovered as monophyletic), Clade I, Sclerodactylinae and Thyoninae.Phyllophoridae was recovered as monophyletic and consists of three subfamilies (all were recovered as monophyletic), Cladolabinae, Phyllophorinae and Semperiellinae.

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A new species of Havelockia Pearson, 1903 from the Argentine Sea (Holothuroidea: Dendrochirotida: Sclerodactylidae)

Cited by 8 publications

References 8 publications

Taxonomic remarks onHavelockiaandThyone(Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

Taxonomic remarks onHavelockiaandThyone(Echinodermata: Holothuroidea: Dendrochirotida), with descriptions of two new species from the Brazilian coast

Echinoderms in San Matías Gulf, Southwestern Atlantic Ocean

Filogenia morfológica das famílias Phyllophoridae e Sclerodactylidae (Echinodermata: Holothuroidea: Dendrochirotida)

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