A taxonomic review of the genus Asterostegus (Echinodermata: Ophiuroidea), with the description of a new species

Abstract

Abstract.A revision of the genus Asterostegus Mortensen, 1933 (Echinodermata: Ophiuroidea: Euryalidae) is based on seven specimens, including the holotype of Asterostegus maini McKnight, 2003. A new species, Asterostegus sabineae sp. nov., is described from off Reunion Island and two other species, A. tuberculatus Mortensen, 1933 and A. maini, are redescribed. A tabular key to the three species of the genus Asterostegus is provided. Some terminology of the taxonomy of euryalid ophiuroids is revised.

Non-destructive morphological observations of the fleshy brittle star, Asteronyx loveni using micro-computed tomography (Echinodermata, Ophiuroidea, Euryalida)

“…Some additional terms for euryalid ophiuroids follow Byrne (1994), Stewart (2000), and Okanishi and Fujita (2014). Especially, we here provide explanation about superficial ossicles of euryalid ophiuroids.…”

“…Especially, we here provide explanation about superficial ossicles of euryalid ophiuroids. Recently, both “epidermal ossicles” and “external ossicles” have been used for those ossicles in descriptions of euryalid ophiuroids (e.g., Okanishi and Fujita 2014; Okanishi 2017). However, “epidermal ossicles” may not be suitable because epidermis is frequently lost in echinoderms.…”

“…As a result, some morphological characters are lost. For example, although intact parts were left after the dissection as ophiuroids are pentaradial, part of the external ossicles and skin of the paratypes of Asterostegus sabineae and Squamophis lifouensis have been lost when treated with bleach to reveal the deeper embedded ossicles (Stöhr 2011; Okanishi and Fujita 2014). …”

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

“…Los especímenes fueron identificados usando los trabajos de Müller & Troschel (1842), Lyman (1860Lyman ( , 1875Lyman ( , 1878Lyman ( , 1879Lyman ( , 1883, Wyville-Thomson (1873), Lütken & Mortensen (1899), McClendon (1909), H.L. Clark (1911Clark ( , 1913, A.H. Clark (1921), Döderlein (1927), Ziesenhenne (1940), Hendler (1996), Hendler et al (1995) y Okanishi & Fujita (2014). Las especies se ordenaron sistemáticamente de acuerdo con Okanishi & Fujita (2013) y O´Hara et al (2017, mientras que los nombres válidos siguen los criterios de Stöhr et al (2018) y Granja-Fernández et al (2015a, 2015b.…”