Abstract
Three new species of the genusPseudomesochra T. Scott 1902 from the Antarctic Weddell Sea and the Arctic Laptev Sea are described. The male CV stage specimen ofPseudomesochra meridianensis s.n. found in the Weddell Sea is regarded as the first true record of a male ofPseudomesochra. It is shown that the genus has to be removed from the family DiosaccidaeSars 1906 and instead has affinities with the ParanannopidaePor 1986. The Paranannopidae includingPseudomesochra share a Mxp with only 2 syncoxal and 1 basal seta, a deeply incised anal somite with a pseudoperculum instead of a well developed anal operculum, a lost or vestigial caudal seta I, a similar structure of the female genital field and a segmental apophysis on the male P3 enp2, a non-prehensile and 2-segmented Plenp, only 4 endopodal setae and a spine-like pinnate seta on the proximal syncoxal endite of the Mx. The latter 3 characters seem to separate the Parannopidae from closely related taxa of the thalestrid subfamilies Pseudotachidiinae sensuLang 1936 and DonsiellinaeHicks 1988. Showing several autapomorphies,Pseudomesochra has an isolated position within the Paranannopidae, therefore a new subfamily Pseudomesochrinae is proposed containing only the type genusPseudomesochra. An amended key to the species is given.
Similar content being viewed by others
References
Ax, P. (1984): Das phylogenetische System. — 349 pp.; Stuttgart (Fischer).
Bodin, P. (1968): Copépodes Harpacticoides des étages bathyal et abyssal du golfe de Gascogne. — Mém. Mus. nat. Hist. natur.,A 55 (1): 61–68.
Brady, G. S. (1910): Die marinen Copepoden der deutschen Südpolar-Expedition, 1901–1903. — I. Über die Copepoden der Stämme Harpacricoida, Cyclopoida, Notodelphyoida und Caligoida. — Dt. Südpolarexpedition 1901–1903 Berlin,11 (5): 4497–4593.
Coull, B. (1973): Meiobenthic Harpacticoida (Crustacea, Copepoda) from the deep sea off North Carolina III. The families Tisbidae Stebbing emend.Lang ThalestridaeSars emend.Lang and DiosaccidaeSars. — Trans. Amer. microsc. Soc.,92 (4): 596–603.
Drzycimski, I. (1968): Neue Harpacticoida (Copepoda) aus dem westnorwegischen Küstengebiet. — Sarsia,31: 15–24.
Gee, J. M. &Huys, R. (1990): The rediscovery ofDanielssenia intermedia Wells, 1965 (Copepoda, Harpacticoida): a missing link between the “danielssenid” genera and ParanannopusLang 1936 (Paranannopidae). — J. natur. Hist.,24: 1549–1571.
—— —— —— (1994): Paranannopidae (Copepoda: Harpacticoida) from sublittoral soft sediments in Spitsbergen. — J. natur. Hist.,28: 1007–1046.
Hennig, W. (1966): Phylogenetic Systematics. — 264 pp.; Urbana, Chicago, London (University of Illinois Press).
Hicks, G. R. F. (1988): Systematics of the DonsiellinaeLang (Copepoda, Harpacticoida). — J. natur. Hist.,22: 639–684.
Huys, R. (1990): A new family of harpacticoid copepods and an analysis of the phylogenetic relationships within the Laophontoidea T. Scott. — Bijdr. Dierkde.,60 (2): 79–120.
—— —— —— (1990): A new harpacticoid copepod family collected from Australian sponges and the status of the subfamily RhynchothalestrinaeLang. — Zool. J. Linnean Soc,99: 51–115.
Huys, R. &Boxshall, G. (1991): Copepod Evolution. — 468 pp.; London (Ray Society).
Huys, R. &Gee, J. M. (1990): A revision of ThompsonulidaeLang 1944 (Copepoda: Harpacticoida). — Zool. J. Linnean Soc.,99: 1–49.
—— & —— (1993): A revision ofDanielssenia Boeck andPsammis Sars with the establishment of two new generaArchisenia andBathypsammis (Harpacticoida: Paranannopidae). — Bull. natur. Hist. Mus., Zool.,59 (1): 45–81.
Lang, K. (1936a): Die Familie der CletodidaeSars 1909. — Zool. Jb.,68 (6): 445–588.
—— —— —— (1936b): Beiträge zur Kenntnis der Harpacticiden. — III. Die GattungPseudomesochra T. Scott nebst Beschreibung einer neuen Art dieser Gattung. — Zool. Anz.,113 (7/8): 174–177.
—— —— —— (1948): Monographie der Harpacticiden I und II. — Repr. Otto Koeltz Sci. Publ.: 1682 pp.; Koenigstein (Koeltz).
—— —— —— (1965): Copepoda Harpacticoidea from the Californian Pacific Coast. — Kungl. Svensk. vetenskapsakad. Handl.,10 (2): 1–560.
McMillan, G. J. (1989): Description of the life-history stages ofAmphiascus undosus Lang (Copepoda, Harpacticoida). — Can. J. Zool.,69: 512–527.
Martinez-Arbizu, P. &Moura, G. (1994): The phylogenetic position of the CylindropsyllinaeSars (Copepoda, Harpacticoida) and the systematic status of the LeptopontiinaeLang. — Zool. Beitr., N.F.,35 (1): 55–77.
Monard, A. (1927): Synopsis universalis gernerum Harpacticoidarum. — Zool. Jb.,54: 139–176.
Por, F. D. (1986): A re-evaluation of the family CletodidaeSars, Lang (Copepoda, Harpacticoida). — In:Schriever, G. et.al. [Eds.]: Proceedings of the Second International Conference on Copepoda, 13–17 August 1984; Ottawa, Canada. — Nat. Mus. natur. Sci. Ottawa,58: 420–425.
Sars, G. O. (1906): An account of the crustacea of Norway. Copepoda Harpacticoida. Parts XV–XVI. Diosaccidae (concluded), Canthocamptidae (part). — Bergen Mus.: 173–196, pls. CXIII–CXXVI.
-- -- -- (1911): An account of the crustacea of Norway. Copepoda Harpacticoida. Supplement continued. Parts XXXI–XXXVV, and index. — Bergen Mus.: 369–443.
Scott, T. (1902): Notes on gatherings of Crustacea collected by the fishery steamer “Garland”, and the steam trawlers “Star of Peace” and “Star of Hope”, of Aberdeen, during the year 1901. — 20th Ann. Rep. Fishery Board Scotland/Edinburgh,20 (3): 447–485.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Willen, E. Pseudomesochra T.Scott 1902 as a member of the ParanannopidaePor 1986 (Copepoda, Harpacticoida) with a description of three new species. Senckenbergiana maritima 28, 81–109 (1996). https://doi.org/10.1007/BF03042824
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF03042824