Revisión del género Metacrangon y descripción de una nueva especie (Decapoda, Crangonidae)

Abstract

RESUMEN.Se revisa el género Metacrangon Zarenkov, 1965 y se propone una nueva especie, Metacrangon bahamondei n. sp., considerando los ejemplares obtenidos por el RV "Polarstern" en la zona austral de Chile. Palabras claves:Metacrangon bahamondei, Decapoda, Crangonidae, "cabeza espinosa", Chile. Overview on the genus Metacrangon and description of a new species(Decapoda, Crangonidae)ABSTRACT. The genus Metacrangon is review and on the basis of samples collected by the RV "Polarstern" in southern Chile, a new species Metacrangon bahamondei n. sp. is proposed.

Three new species of the crangonid genus Metacrangon Zarenkov (Crustacea: Decapoda: Caridea) from Australia

“…The previously described species known from the southern hemisphere are M. bahamondei, M. bellmarleyi, M. crosnieri, M. knoxi and M. richardsoni (Yaldwyn, 1960) (cf. Yaldwyn, 1960Komai, 1997;Retamal & Gorny, 2003). With the exception of M. richardsoni, all of them are referred to the M. jacqueti species group.…”

“…This new species is referable to the Metacrangon jacqueti species group because of the disposition of teeth on the carapace, the presence of ventral tooth on each first to third abdominal pleuron, and the setose margins of the dactyli of the fourth and fifth pereopods (Komai, 1997). The following nine species are referred to this informal species group (Komai, 1997;Retamal and Gorny, 2003): M. agassizi (Smith, 1882) from the northwestern Atlantic; M. bahamondei Retamal and Gorny, 2003 from southern part of Chile; M. bellmarleyi (Stebbing, 1914) from western to southern Africa; M. crosnieri Komai, 1997 from Madagascar; M. jacqueti from the northeastern Atlantic; M. knoxi from the Chatham Rise, New Zealand; M. ochotensis (Kobjakova, 1955) from the South Kuril Islands in the northwestern Pacific; M. procax (Faxon, 1893) from California to Peru in the eastern Pacific; and M. similis Komai, 1997 from Japan. However, M. spinidorsalis is unique even within the genus, as it possesses a distinct middorsal tooth on the second abdominal tergite.…”

Insights on the biology and ecology of the deep-water shrimp Parapontophilus occidentalis (Faxon, 1893) (Crustacea: Caridea: Crangonidae) in the eastern Pacific with notes on its morphology

“…The family Crangonidae belongs to the infraorder Caridea and is highly diverse worldwide, with a total of 219 species known to date (De Grave & Fransen 2011). Crangonid shrimps consist mainly of benthic predators (e.g., Pontophilus norvegicus (M. Sars, 1861): Cartes et al 2007a;Crangon hakodatei Rathbun, 1902: Mahera et al 2013) that usually inhabit the continental shelf (e.g., Retamal & Gorny 2003;Campos et al 2012) but can also be found in deep waters (Guzmán & Quiroga 2005;Komai 2008;Hendrickx 2012b), where they can even dominate megafauna communities (Cartes et al 2007b;Papiol et al 2012). Therefore, they are important in the transfer of organic carbon between trophic levels in food webs in a variety of environments (Cartes et al 2007a;Campos et al 2012;Papiol et al 2013).…”

The crangonid shrimp genusMetacrangon(Crustacea: Decapoda: Caridea) from New Zealand, with descriptions of four new species

“…The crangonid shrimp genus Metacrangon Zarenkov, 1965 is currently represented by 25 species and one subspecies (Zarenkov 1965;Fujino and Miyake 1970;Butler 1980;Komai 1994Komai , 1995Komai , 1997Kim and Hayashi 2003;Retamal and Gorny 2003;Kim 2005;Komai and Komatsu 2009). It is characterized by the shallowly depressed gastric region of the carapace, the usual presence of a pair of submedian teeth on the carapace, the laterally flared pleuron of the sixth abdominal somite, and the second pleopod with an appendix masculina being much shorter than the endopod (Zarenkov 1965;Butler 1980;Kim and Hayashi 2003;Kim 2005).…”

“…It is characterized by the shallowly depressed gastric region of the carapace, the usual presence of a pair of submedian teeth on the carapace, the laterally flared pleuron of the sixth abdominal somite, and the second pleopod with an appendix masculina being much shorter than the endopod (Zarenkov 1965;Butler 1980;Kim and Hayashi 2003;Kim 2005). Many species occur in the northern hemisphere (19 species and one subspecies in the North Pacific and one species in the North Atlantic), but five species, namely, M. bahamondei Retamal and Gorny, 2003, M. bellmarleyi (Stebbing, 1914), M. crosnieri Komai, 1997, M. knoxi (Yaldwyn, 1960) and M. richardsoni (Yaldwyn, 1960), are found in the southern hemisphere (Stebbing 1914;Yaldwyn 1960;Komai 1997;Retamal and Gorny 2003). In addition, one undescribed species is known from southwestern Australia, awaiting formal description (Poore et al 2008;Komai and Taylor, in press).…”