A New Species of Heteromysis (Mysida, Mysidae) Associated with Sponges, from the Uraga Channel, Central Japan, with Notes on Distribution and Habitats within the Genus Heteromysis

Abstract

A new species, Heteromysis komaii, is described from specimens obtained from the gastral cavity of sponges, Callyspongia confoederata, from the Uraga Channel, located at the entrance of Tokyo Bay, central Japan. Heteromysis komaii is distinguished from all known species of the genus by several features: the distal segment of the antennular peduncle has a flagellate spine at the inner distal angle, the antennal scale is longer than the antennal peduncle, the endopod of the third thoracopod has two flagellate spines at the inner distal angle of the carpus, the fourth to eighth thoracopodal endopods have the carpopropodus divided into two or three subsegments, the male pleopod is unmodified, the uropodal endopod is without spines, the telson has spines on the distal half of the lateral margin, and the apical cleft of the telson is with spinules throughout. The distribution and habitats of the species of Heteromysis are reviewed. RÉSUMÉUne nouvelle espèce, Heteromysis komaii, est décrite d'après des spécimens provenant de la cavité gastrique d'éponges Callyspongia confoederata de Uraga Channel, situé à l'entrée de la Baie de Tokyo, Japon central. Heteromysis komaii se distingue de toutes les espèces connues du genre par plusieurs caractères: le segment distal du pédoncule antennulaire a un flagelle à l'angle distal interne, l'écaille antennaire est plus longue que le pédoncule antennaire, l'endopodite du troisième thoracopode a deux flagelles à l'angle distal interne du carpe, les endopodites des quatrième à huitième thoracopodes ont le carpopropode divisé en deux ou trois sous-segments, le pléopode mâle n'est pas modifié, l'endopodite de l'uropode est dépourvu d'épines, le telson a des épines sur la moitié distale du bord latéral, et l'échancrure apicale du telson est entièrement ornée de spinules. La répartition et les habitats des espèces d'Heteromysis sont examinés.

Heteromysis (Heteromysis) microps (Crustacea, Mysidae), a commensal species for Upogebia pusilla (Crustacea, Upogebiidae) in Arcachon Bay (NE Atlantic Ocean)

“…Sars, 1882, on bathyal bottoms (Frutos and Sorbe, 2014). Members of this genus are generally distributed in coastal warm-water regions and most of the species are restricted to small geographical areas (Fukuoka, 2005). This study reports on the first record of H. microps in the Bay of Biscay, and most importantly, its first record in association with another invertebrate species.…”

Two new species of Heteromysini (Mysida, Mysidae) from the island of Madeira (N.E. Atlantic), with notes on sea anemone and hermit crab commensalisms in the genus Heteromysis S. I. Smith, 1873

“…The original spelling is a non-Latinized fusion of the first name of Olive S. Tattersall with the generic name Mysis Latreille, 1802 and is not demonstrably incorrect according to article 32.5. of the nomenclatorial code (ICZN, 1999). In the most recent literature, the use of the unjustified emendation (e.g., Bamber, 2000;Fukuoka, 2005) did not clearly prevail over the original spelling (Price et al, 2002;Keable et al, 2003). Therefore, article 33.2.3.1. does not apply and the emendation is to be treated (article 33.5.)…”

“…Among the large number of W. Atlantic Heteromysis species listed by Fukuoka (2005), H. mayana Brattegard, 1970 (occasionally associated with sea anemones in the tropical W. Atlantic) and two mysid species associated with sponges in Cuba, H. rubrocincta Bȃcescu, 1968 andH. gomezi Bȃcescu, 1970, show great similarity with H. dardani and H. wirtzi.…”

Three new species of Heteromysis (Mysida, Mysidae, Heteromysini) from the Cape Peninsula, South Africa, with first documentation of a mysid-cephalopod association

“…As for H. cancelli and H. octopodis , benthic invertebrates may serve for many species as cryptic habitats in a broader sense, such as sponges, stony corals, gorgonians, sea anemones, brittle stars, tubes of annelids, and shells inhabited by hermit crabs (see list in Fukuoka 2005). The occurrence of H. octopodis in tide pools is shared with only few species of Heteromysis (Tattersall and Tattersall 1951, Bousfield 1958, Băcescu 1986, Fukuoka 2005).…”

“…The distributions and habitats occupied by species belonging to this genus were reviewed by Fukuoka (2005). Most species were found in cryptic habitats, such as dense vegetation, microcaves, empty gastropod shells, etc.…”