Dactylamblyops Holt & Tattersall, 1906

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 : 5-6

Genus Dactylamblyops Holt & Tattersall, 1906

Dactylamblyops Holt & Tattersall, 1906b: 9 (Antarctic).

Chalcophthalmus Illig, 1906: 200 , fig. 7 (junior synonym).

Dactylerythrops – Illig 1906: 199–200, fig. 6 (invalid generic assignment); 1930: 424 (in synonymy).

Dactylamblyops – W.M. Tattersall 1908: 29 (amended definition). — Tattersall & Tattersall 1951: 260– 261 (diagnosis). — Ii 1964: 279–283 (key to species in the Far East, diagnosis). — Pillai 1965: 1706 (key to species in Indian waters, diagnosis). — Mauchline 1980: 27 (taxonomy, in key to genera). — Murano 1981: 275–278 (definition of species groups, key to species). — Kazmi et al. 1999: 149 (Arabian Sea, in taxa list, in key). — Nouvel et al. 1999: 79 (taxonomy, in list of genera). — San Vicente 2010: 44, 59 (Antarctic, diagnosis, key to species). — San Vicente & Cartes 2011: 463–464 (key to species of hodgsoni -group). — Petryashov 2014a: 149 (biogeography, Antarctic). — Wittmann et al. 2014: 334 (taxonomic assignment).— Wittmann & Chevaldonné 2021: 199, 208, 211 (morphology, sensory organs). — Mees & Meland 2024: Aphia-ID 119851 (accepted).

Chalcophthalmus – Illig 1930: 425 (in synonymy). — Mees & Meland 2024: Aphia-ID 226149 (unaccepted).

Diagnosis

Carapace normal. Eyes stalked, set apart, lateral margins not produced in a finger-like non-sensory process; stalk with ocular papilla; visual elements incomplete. Appendix masculina well developed. Antennal peduncle with three segments in linear arrangement; lateral margin of scale being bare up to an apical tooth or (in D. latisquamosus ) only to a subapical tooth. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile, endopods 3–8 with unsegmented carpus separated from 1–2-segmented propodus by an oblique articulation. Female with three pairs of oostegites. Female pleopods reduced to uniramous setose plates. Male pleopods biramous, setose, no spines; endopod 1 unsegmented, endopods 2–5 and all exopods multi-segmented. Both rami of uropods unsegmented, setose all around; endopod with or without spine. Telson normal, no lateral constriction, no terminal incision, lateral margins not serrated; terminal and part of lateral margins with spines, no setae.

Type species

Dactylamblyops Hodgsoni Holt & Tattersall, 1906 , by original designation according to ICZN (1999).

Revised combinations

Dactylamblyops laticauda Birstein & Tchindonova, 1958 is here recombined as Amblyopsoides laticauda ( Birstein & Tchindonova, 1958) comb. nov. (see below). The binomen Dactylamblyops japonica Ii, 1964 is here acknowledged based on the species having an antennal scale with a bare lateral margin up to a large apical tooth. In contrast, the type species of Hyperamblyops Birstein & Tchindonova, 1958 , i.e., H. nana Birstein & Tchindonova, 1958 , shows an antennal scale with a setose outer margin not ending in a tooth. Accordingly, the recombination of D. japonica Ii, 1964 as H. japonica ( Ii, 1964) by Murano (1975) is not acknowledged here.

Species included (16 species acknowledged)

– D. atlanticus Murano & Mauchline, 1999 from the NE Atlantic: Ireland Trough, 55° N 12° W, depth 2500 m ( Murano & Mauchline 1999)

– D. benthophilus sp. nov. from the Southern Ocean: South Sandwich Trench, Weddell Sea, Powell Basin, Drake Passage, 58– 71° S, 14– 65° W, depth 756–4805 m

– D. corberai San Vicente & Cartes, 2011 from the Mediterranean, 38– 41° N, 2– 22° E, depth 358– 1858 m ( San Vicente & Cartes 2011; San Vicente 2017)

– D. fervidus Hansen, 1910 from the Indian Ocean: off Moluccas, 1° S, 127° E, depth ≤ 1500 m ( Hansen 1910)

– D. goniops W.M. Tattersall, 1907 from the NE Atlantic: Ireland, Faroes, Bay of Biscay, 44– 60° N, 2– 12° W, depth 585–1331 m (W.M. Tattersall 1907; Tattersall & Tattersall 1951; Nouvel & Lagardère 1976; Frutos & Sorbe 2013; San Vicente et al. 2013; Rios et al. 2022)

– D. hodgsoni Holt & Tattersall, 1906 from the Southern Ocean, 44– 75° S, 80° E – 9° W – 162° W, depth 200–4200 m ( Holt & Tattersall 1906b; Zimmer 1914; Birstein & Tchindonova 1962; San Vicente & Cartes 2011; Wittmann & Ariani 2019; Wittmann & Chevaldonné 2021)

– D. iii Nouvel & Lagardère, 1976 from the NW Pacific: off Japan, 34– 35° N, 138– 140° E, depth 70–1300 m, ≤ 2000 m ( Ii 1964; Nouvel & Lagardère 1976; Murano 1981; Wittmann & Ariani 2019; Wittmann & Chevaldonné 2021)

– D. japonicus Ii, 1964 , from the NW Pacific: off Japan, 34– 35° N, 138– 139° E, depth ≤ 2300 m ( Ii 1964)

– D. latisquamosus ( Illig, 1906) from Indonesia: off Sumatra, 10– 0° N, depth ≤ 800 m ( Illig 1906, 1930)

– D. murrayi W.M. Tattersall, 1939 from the Arabian Sea and Weddell Sea, total range 35° N – 63° S, 28° W – 139° E, depth ≤ 480 to 4543 m (W.M. Tattersall 1939; San Vicente & Cartes 2011; Wittmann & Ariani 2019; Wittmann & Chevaldonné 2021; present paper: 7)

– D. pellucidus Birstein & Tchindonova, 1958 from the NW Pacific: off Japan, Kuril-Kamchatka Trench, 30– 42° N, 137– 152° E, depth 4400–5140 m ( Birstein & Tchindonova 1958; Golovan et al. 2019). Specimens from about 1000 m off Japan reported by Murano (1981) as D. pellucida are not acknowledged due to their having fewer (0–1 vs 4) spines on the endopod of the uropods and more (32 vs 25) spines on the lateral margins of the telson, compared to the original description

– D. sarsi ( Ohlin, 1901) from the Arctic Ocean: Spitzbergen (Ice Fjord), Amundsen Basin, 78– 83° N, circumpolar (14° E – 121° E – 129° W), depth 50–4320 m ( Ohlin 1901; Petryashov 1993, 2014b)

– D. solivagus Birstein & Tchindonova, 1958 from the N Pacific: Kurile-Kamchatka Trench, 50° N, 155° E, depth 500–640 m ( Birstein & Tchindonova 1958)

– D. stenurus Murano, 1969 from the NW Pacific: off Japan, 32– 35° N, 139– 140° E, depth> 1000 m, ≤ 2300 m ( Murano 1969, 1981)

– D. tenellus Birstein & Tchindonova, 1958 , from the NW Pacific: off Japan, 28° N, 131° E, depth ≤ 6600 m ( Birstein & Tchindonova 1958)

– D. thaumatops W.M. Tattersall, 1907 from the NE Atlantic: Iceland, Faroes to Bay of Biscay, 44– 61° N, 2– 17° W, depth 995–2295 m (W.M. Tattersall 1907; Tattersall & Tattersall 1951; Nouvel & Lagardère 1976; Corbari & Sorbe 2001; Astthorsson & Brattegard 2022)