Leptostracans (Crustacea: Phyllocarida) from the Ría de Ferrol (Galicia, NW Iberian Peninsula), with description of a new species of <em>Nebalia</em> Leach, 1814

Abstract

SUMMARY: Knowledge on taxonomy and ecology of leptostracan crustaceans is still scarce in many parts of the world. Sampling in subtidal sediments in the Ria of Ferrol (NW Spain) between 2006 and 2007 yielded several leptostracan specimens belonging to six species. This is, so far, the largest number of leptostracan species reported from a single area. Some specimens belong to an undescribed species of Nebalia Leach, 1814, which is described herein as N. reboredae n. sp. The new species has a rostrum about 2.2 times as long as wide, the antennular scale is slightly more than twice as long as wide, the fourth article of the antennule has one short thick distal spine, the first article of the endopod of the second maxilla is 1.3 times as long as the second one, the exopod of the second maxilla is longer than the first article of the endopod, the posterior dorsal borders of pleonites 5-7 are provided with distally rounded to truncated denticles, and the uropods are as long as pleonite 7 and the anal somite combined. All the species collected are reported, including the number of specimens, sexual condition and substrate type. A key to all known neritic species of the Iberian Peninsula is provided.Keywords: Crustacea, Leptostraca, Nebalia, Sarsinebalia, subtidal, sediment, Ría de Ferrol, Atlantic.RESUMEN: Leptostráceos (Crustacea: Phyllocarida) de la Ría de Ferrol (Galicia, NO península Ibérica) con la descripción de una nueva especie de Nebalia Leach, 1814. -El conocimiento sobre la taxonomía y ecología del orden Leptostraca en muchas partes del mundo es todavía fragmentario. El examen de muestras infralitorales recolectadas en la Ría de Ferrol (NO península Ibérica) entre 2006 y 2007 ha revelado la presencia de seis especies de leptostráceos. Hasta la fecha, este es el mayor número de especies encontradas en una única área. Varios de los ejemplares encontrados pertenecen a una especie no descrita del género Nebalia Leach, 1814, que es descrita en el presente trabajo como N. reboredae n. sp. La nueva especie se caracteriza por presentar un rostro 2.2 veces más largo que ancho, una escama antenular algo más de dos veces más larga que ancha, el cuarto segmento de la anténula porta una única espina corta gruesa distal, el primer segmento del endopodio de la segunda maxila es 1.4 veces más largo que el segundo segmento, el exopodio de la segunda maxila es más largo que el primer segmento del endopodio, los dentículos del borde posterior dorsal de los pleonitos 5-7 son distalmente de redondeados a truncados, y los urópodos son tan largos como el pleonito 7 y el somita anal combinados. Se indica para todas las especies encontradas tanto el número de ejemplares como estado sexual y tipo de sustrato. Se incluye una clave para todas las especies de leptostráceos neríticos encontrados en la península Ibérica hasta la fecha.

A new Nebalia species (Crustacea, Phyllocarida, Leptostraca) from the eastern Mediterranean Sea

“…On the contrary, Moreira et al . (2009) pointed out that up to six leptostracan taxa may coexist in the same environment (i.e. embayments in NW Iberian Peninsula), but any given species seems to appear mostly in one type of sediment.…”

“…Knowledge about diversity and distribution of leptostracans (Crustacea, Phyllocarida) has improved substantially in the last three decades (e.g. Dahl, 1985, 1990; Martin et al ., 1996; Moreira et al ., 2009), and a number of new taxa, including new genera, have been described all around the world, from marine caves to the deep sea (Hessler, 1984; Bowman et al ., 1985; Haney et al ., 2001; Haney & Martin, 2004; Song et al ., 2012), as well as in a variety of shallow-water habitats and substrates: sponges (Ortiz et al ., 2011), seagrasses (Dahl, 1985), algae (Haney & Martin, 2005) and sediments (Vetter, 1996a, b; Ledoyer, 1997; Moreira et al ., 2007), or in baited traps (Olesen, 1999; Lee & Bamber, 2011).…”

A new species of Nebalia (Crustacea, Leptostraca) from a hydrothermal field in Kagoshima Bay, Japan

“…Nebalia was established by Leach (1814) with type Nebalia herbstii from the British Isles. More than 37 species of this genus have been reported thus far from Africa (Barnard 1914; Kensley 1976; Olesen 1999; Bochert and Zettler 2012), Red Sea (Wägele 1983), Adriatic Sea (Dahl 1985), Britain-Celtic Sea (Dahl 1985), Greenland (Dahl 1985), Norway (Dahl 1985), Pakistan (Kazmi and Tirmizi 1989), Antarctic Sea (Dahl 1990), Falkland Islands (Dahl 1990), New Zealand (Dahl 1990), South Atlantic Ocean (Dahl 1990), Mexico (Escobar-Briones and Villalobos-Hiriart 1995; Ortiz et al 2011), California (Martin et al 1996; Vetter 1996; Haney and Martin 2000, 2005), Mediterranean Sea (Ledoyer 1997; Moreira et al 2007, 2012; Koçak and Moreira 2015), New Caledonia (Ledoyer 2000), Northeast Atlantic (Haney et al 2001; Moreira et al 2003, 2009), Aegean Sea (Moreira et al 2007), Hong Kong (Lee and Bamber 2011), South Korea (Song et al 2012, 2013; Song and Min 2017), and Malaysia (Othman et al 2016). Although our understanding of the morphology and distribution of the genus Nebalia has progressed, further investigation into the ecology of the genus is necessary.…”

A new species ofNebalia(Malacostraca: Phyllocarida: Leptostraca) from South Korea, with a key to the species ofNebaliaLeach, 1814

“…Among them, more than half of the species (35 species) are included in the genus Nebalia Leach, 1814 (Mess, 2015). The genus Nebalia has been reported in diverse habitats, such as estuarine mudflats (Haney & Martin, 2005; Moreira et al , 2007), sea grass beds (Dahl, 1985), sponges (Ortiz et al , 2011), sandy bottoms with algal mats (Song et al , 2012, 2013), organic-rich muddy sediments in harbours, gravel beaches, lagoons, and a variety of subtidal sedimentary substrata (Moreira et al , 2009).…”