A new species of deep-water Holothuroidea (Echinodermata) of the genus <i>Synallactes</i> from off western Mexico

Abstract

SUMMARY: An undescribed species of Synallactes was collected during a deep-water benthic fauna survey off the Pacific coast of Mexico in the East Pacific, with the R/V El Puma. This new species differs from all the other known Synallactes by the presence of huge massive rods in the tube feet, some of them club-shaped. The later ossicle shape is unique among Holothuroidea. This is the first record of a Synallactes in the Gulf of California.

Deep-water Holothuroidea (Echinodermata) collected during the TALUD cruises off the Pacific coast of Mexico, with the description of two new species

“…We have considered as valid only the record for Abyssocucumis albatrossi (cited as Stereocucumis abyssorum; however, presence of spiny arms on the ossicles indicates the material belongs to A. albatrossi), Pannychia moseleyi, Molpadia intermedia, and M. musculus, all 4 species collected during this survey, and for Scotoplanes clarki and Heldingia californica (see Table 2), not collected during the TALUD cruises. Finally, a new deep water species of Synallactes was recently described from the Gulf of California (Massin and Hendrickx, 2010) and has also been included in the list of Mexican species (Table 2).…”

“…This species has been recently described in a separate paper (Massin and Hendrickx, 2010). Distribution.…”

Synallactes mcdanieli sp. nov., a new species of sea cucumber from British Columbia, Canada and the Gulf of Alaska, USA (Holothuroidea, Synallactida)

“… Edwards (1907) mentioned the existence of S. challengeri in the Gulf of Alaska based on six specimens collected between 87 to 438 m depth, on green mud, fine sand; this was followed by Lambert (1997) and Lambert and Boutillier (2011) . As stated by Solis-Marin (2003) and Massin and Hendrickx (2010) , the presence of S. challengeri along the west coast of North America up to the coast of California was putative and was in need of review. Indeed, S. challengeri is known from sub-Antarctic islands (HMS Challenger St. 148a, 46º 53’ S, 51º 52’ E, 990 m depth) ( Théel 1886 , Massin 1992 ); thus, we consider the specimens described by Edwards (1907) and Lambert (1997) to be Synallactes mcdanieli sp.…”

Ofiuroideos (echinodermata: ophiuroidea) recolectados en aguas profundas durante las campañas talud en el Golfo de California y Pacífico Mexicano

“…La prospección intensiva y sistemática realizada durante el proyecto TALUD a lo largo del Pacífico mexicano y en el golfo de California, ha permitido importantes avances en el conocimiento de las condiciones ambientales y de las comunidades bentónicas de distintos taxa (i.e., esponjas, moluscos, poliquetos, crustáceos, equinodermos y peces) que habitan el mar profundo mexicano. A partir de material recolectado durante el proyecto TALUD, se han descrito nuevas especies, se ha incrementado considerablemente el conocimiento respecto a la distribución espacial y batimétrica de los taxa y se ha avanzado en el entendimiento de las condiciones ambientales en que se desarrollan las comunidades de aguas profundas del país (véase Zamorano et al, 2006;Massin & Hendrickx, 2010Hendrickx et al, 2011;Zamorano et al, 2012;Hendrickx, 2012;Gómez & Morales-Serna, 2012;Méndez, 2012;Papiol et al, 2016;Cruz et al, 2018;Hendrickx & Hernández-Payan, 2018 m; Holothuroidea, 377-2,220 m; Echinoidea, 122-2,121 m, según los datos ya publicados para la zona de estudio), y tiene la capacidad de habitar zonas con un mayor intervalo de concentración de oxígeno disuelto (0.03 a 2.45 ml O2/l) (Hendrickx et al, 2011, Massin & Hendrickx, 2011, Conejeros et al, 2017. Adicionalmente, se trata del grupo biológico numéricamente muy abundante (36,013 individuos) comparativamente con otros grupos de macro-invertebrados recolectados durante el proyecto TALUD.…”