Ischnomesus Richardson, 1908

Kavanagh, Fiona A., Frutos, Inmaculada & Sorbe, Jean Claude, 2015, Ischnomesus harrietae sp. nov., a new benthic asellote (Crustacea: Isopoda: Ischnomesidae) from bathyal bottoms of the southern Bay of Biscay, Zootaxa 3911 (2), pp. 201-217 : 203

publication ID

https://doi.org/ 10.11646/zootaxa.3911.2.3

publication LSID

lsid:zoobank.org:pub:EDF19A15-6C94-49EB-A9F0-AC321C347F13

DOI

https://doi.org/10.5281/zenodo.3509149

persistent identifier

https://treatment.plazi.org/id/1A6C8B7B-FFAE-980E-FF18-FC12FBDBF804

treatment provided by

Plazi

scientific name

Ischnomesus Richardson, 1908
status

 

Ischnomesus Richardson, 1908 View in CoL

Ischnosoma: G. O. Sars, 1868: 84 View in CoL .

Ischnomesus: Richardson, 1908: 81 View in CoL ; Hansen, 1916: 56; Gurjanova, 1932: 40 l; Wolff, 1956: 88; Menzies, 1962: 111; Wolff, 1962: 73; Menzies & George, 1972: 971; Kussakin, 1988: 419; Merrin & Poore, 2003: 290 View Cited Treatment .

Rhabdomesus: Richardson, 1908: 81 View in CoL .

Bactromesus: Wolff, 1962: 83 View in CoL .

Type species: Ischnosoma bispinosum G. O. Sars, 1868 (by monotypy).

Species included: Ischnomesus anacanthus Wolff, 1962 ; I. andriashevi Birstein, 1960 ; I. antarcticus Schultz, 1979 ; I. armatus Hansen, 1916 ; I. bacilloides (Beddard, 1886) ; I. bacillopsis (Barnard, 1920) ; I. bacillus (Beddard, 1886) ; I. bidens Menzies, 1962 ; I. birsteini Wolff, 1962 ; I. bispinosus ( G. O. Sars, 1868) ; I. bruuni Wolff, 1956 ; I. calcificus Menzies & George, 1972 ; I. caribbicus Menzies, 1962 ; I. carolinae Chardy, 1974 ; I. chardyi Kussakin, 1988 ; I. decemspinosus Menzies, 1962 ; I. elegans Menzies, 1962 ; I. elongatus Birstein, 1963 ; I. fragilis Birstein, 1971 ; I. glabra Kensley, 1984 ; I. gracilis (Birstein, 1960) ; I. justi Merrin & Poore, 2003 ; I. latimanus Birstein, 1971 ; I. magnificus Menzies, 1962 ; I. multispinis Menzies, 1962 ; I. norvegicus Svavarsson, 1984 ; I. paucispinis Menzies, 1962 ; I. planus Wolff, 1962 ; I. profundus Hansen, 1916 ; I. roseus Wolff, 1962 ; I. simplex Menzies & George, 1972 ; I. simplissimus Menzies, 1962 ; I. spaercki Wolff, 1956 ; I. tasmanensis Merrin & Poore, 2003 ; I. vinogradovi Birstein, 1963 and I. wolffi Menzies, 1962 .

Diagnosis. Pereonites 5–7, pleonite 1 and pleotelson freely articulating. Antennula of at least 6 articles. Maxillipedal palp width equal to or wider than basal endite. Pereopod I carpus with weakly expanded palm. Uropods uniramous, biarticulate.

Remarks. The freely articulating posterior pereonites, pleonite 1 and pleotelson observed in Ischnomesus is a condition presumed to be plesiomorphic, with other genera showing various degrees of fusion of the pereonites (e.g. pereonites 5–7 and pleotelson fused together in genus Haplomesus ; see Kavanagh & Wilson 2007). Uniarticulate uropods have been described by Merrin & Poore (2003) for Ischnomesus justi . As this species displays all the other diagnostic characters that characterise Ischnomesus , biarticulate uropods may not be a diagnostic character for the genus. However, as all remaining 35 species and I. harrietae sp. nov. possess uropods with two articles, we have retained it as a generic character until further information on the occurrence of uniarticulate uropods becomes available through the description of additional species.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Isopoda

Family

Ischnomesidae

Loc

Ischnomesus Richardson, 1908

Kavanagh, Fiona A., Frutos, Inmaculada & Sorbe, Jean Claude 2015
2015
Loc

Bactromesus:

Wolff 1962: 83
1962
Loc

Ischnomesus:

Merrin 2003: 290
Kussakin 1988: 419
Menzies 1972: 971
Wolff 1962: 73
Wolff 1956: 88
Gurjanova 1932: 40
Hansen 1916: 56
Richardson 1908: 81
1908
Loc

Rhabdomesus:

Richardson 1908: 81
1908
Loc

Ischnosoma: G. O . Sars, 1868 : 84

Sars 1868: 84
1868
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