Mysidella G.O. Sars, 1872

Wittmann, Karl J., 2024, The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae, European Journal of Taxonomy 940, pp. 1-180 : 122-124

Genus Mysidella G.O. Sars, 1872

Mysidella G.O. Sars, 1872: 266 , 267.

Mysidella – G.O. Sars 1879: 84–86 (definition). – Zimmer 1909: 169 (diagnosis, key to species). — Illig 1930: 600 (key to species). — Valkanov 1935: 282–283 (in part synonym of Limnomysis ). — Banner 1948b: 108 (diagnosis). — Tattersall & Tattersall 1951: 427 (diagnosis). — Ii 1964: 574 (diagnosis). — Kathman et al. 1986: 191 (description, in key). — Fenton 1990: 437 (diagnosis). — Gerken et al. 1997: 140 (diagnosis). — Murano 2002b: 66 (revision, diagnosis). — Chevaldonné et al. 2015: fig. 5 (molecular systematics). — Shimomura 2016: 30–31 (key to species). — San Vicente 2017: table 2 (distribution of NE Atlantic species). — Mees & Meland 2024: Aphia-ID 119883 (accepted).

Diagnosis

Based on adults of both sexes. Eyes well developed or less frequently rudimentary, in any case separate. Antennula with small, setose male lobe. Antennal scale lanceolate, setose all around, with small apical segment separated by a transverse suture. Antennal peduncle 3-segmented. Labrum asymmetrical with two unequal posterior lobes. Cutting edge of each mandible reduced to triangular mesial lobe with mostly narrowly rugged margins, no teeth, no spines, no setae. Distal segment of maxillula distally widened, distal margin with series of spines decreasing in size mesially, no setae; endite with few, mostly three, large barbed setae, sometimes also with much smaller setae. Maxilla comparatively small, setose, with well-developed exopod, no spines. Thoracic endopod 1 with enlarged propodus armed with spiniform modified setae on distal margin; dactylus slender with slender nail. Carpopropodus of thoracic endopods 3–8 with two or more segments separated by transverse articulations. Marsupium with two pairs of large oostegites plus a vestigial pair on thoracopods 6. Penes mostly large, tubular. Pleopods reduced to setose plates in both sexes. Uropods unsegmented, setose all around, endopod ventrally with series of spines proceeding parallel and close to mesial margin. Telson with terminal cleft armed with laminae or spines, no seta; terminal lobes outside cleft with spines only; lateral margins with spines at least on distal portions.

Type species

Mysidella typica G.O. Sars, 1872 by original designation according to ICZN (1999), Article 68.2.1. The type locality of this species is in the NE Atlantic: Norway, Hardangerfjord, off Utne, 60°26ʹ N, 6°38ʹ E, depth 366 m (G.O. Sars 1872b) according to Article 76.1. of the CODE ( ICZN, 1999).

Species included (18 species acknowledged)

– M. americana Banner, 1948 from the NE Pacific: California, Canada, 33– 52° N, 118– 159° W, depth 30–600 m ( Banner 1948b; Gleye 1981; Price 2001)

– M. antarctica sp. nov. from the Southern Ocean: Weddell Slope, 71° S, 15° W, depth 3103 m

– M. australiana Fenton, 1990 , from the SW Pacific: Tasmania, Bass Strait, 39– 41° S, 144– 149° E, 32–95 m ( Fenton 1990; Price 2001)

– M. biscayensis Lagardère & Nouvel, 1980 from the NE Atlantic and Mediterranean: Bay of Biscay, Catalan Sea, 39– 44° N, 2° E – 6° W, depth 190–720 m ( Lagardère & Nouvel 1980; Price 2001; San Vicente 2017; Ríos et al. 2022)

– M. hoshinoi Shimomura, 2016 from the NW Pacific: Japan, 35° N, 139° E, depth 35 m ( Shimomura 2016)

– M. incisa Wang, 1998 from the NW Pacific and E Indian Ocean: Qiongzhou Strait, northern South China Sea, Timor Sea, 12° S – 22° N, 110– 130° E, depth 20–115 m ( Wang 1998; Liu & Wang 2000; Murano 2002b)

– M. macrophthalma Murano, 2002 from the NW Pacific: northern South China Sea, 22° N, 118° E, depth 415–437 m ( Murano 2002b)

– M. minuta Brattegard, 1973 from the Caribbean: Colombia, Isla Morro Grande de Santa Marta, 11° N, 74° W, depth 5–40 m ( Brattegard 1973, 1974)

– M. mukaii Murano, 2002 from the Indo-Pacific: W Australia, 32° S, 116° E, depth 3 m ( Murano 2002b)

– M. nana Murano, 1970 from the NW Pacific: Japan, 33– 35° N, 130– 140° E, depth 18–80 m ( Murano 2002b)

– M. orientalis Murano, 2002 from the NW Pacific: eastern East China Sea, Sea of Japan, 31– 43° N, 128– 135° E, depth 347–528 m ( Murano 2002b; Golovan et al. 2013)

– M. rotundincisa Wang, 1998 from the NW Pacific: northern South China Sea, 19– 22° N, 112– 113° E, depth 26–260 m ( Wang 1998; Liu & Wang 2000)

– M. sulcata Murano, 2002 from the E Indian Ocean: Timor Sea, Sulu Sea, 13° S – 8° N, 118– 123° E, depth 535–738 m ( Murano 2002b)

– M. tanakai Ii, 1964 from the NW Pacific: off Japan, 35– 43° N, 138– 145° E, depth 220–1075 m ( Murano 2002b; Fukuoka 2009; Shimomura 2016)

– M. tenuicauda Wang, 1998 from the NW Pacific: northern South China Sea, 20° N, 113° E, depth 78 m ( Wang 1998; Liu & Wang 2000)

– M. truncata Murano, 2002 from the NW Pacific: Japan, 28° N, 129° E, depth 138–141 m ( Murano 2002b)

– M. typhlops G.O. Sars, 1872 from the NE Atlantic: Norway, Iceland, 60– 64° N, 5° E – 27° W, depth 293–794 m (G.O. Sars 1872b; Astthorsson & Brattegard 2022)

– M. typica G.O. Sars, 1872 from the NE Atlantic: Iceland, Norway, Ireland, Bay of Biscay, Mediterranean (Balearic Sea, off Monaco, Gulf of Naples), 41– 65° N, 14° E – 15° W, depth 55–540 m (G.O. Sars 1872b; Holt & Beaumont 1900; Holt & Tattersall 1906a; Zimmer 1915; Colosi 1929; Băcesco 1941; Price 2001; Wittmann & Ariani 2019)