Macrochiridothea Ohlin 1901

• Main Author: Poore, Gary C. B.
• Format: Text
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Chaetiliidae; Macrochiridothea; Antarctic; New Zealand; Argentina; Uruguay; Rupert; Hurley; Seta; Menzies; Sheppard; Ohlin; Antarc*
• Online Access: https://dx.doi.org/10.5281/zenodo.6218096; https://zenodo.org/record/6218096

Macrochiridothea Ohlin, 1901 Macrochiridothea Ohlin, 1901: 286. — Stebbing, 1914: 353 -354. — Nordenstam, 1933: 105. — Sheppard, 1957: 168 –173. — Menzies, 1962: 98. — Hurley & Murray, 1968: 244. — Moreira, 1973: 12 (key). — Jones & Fenwick, 1978: 619. — Poore, 1984: 71 –72 (part). — Harrison-Nelson & Bowman, 1990: 127 (list of species). — Carvacho, 1997: 46 –47 (key). Type species. Macrochiridothea michaelseni Ohlin, 1901, subsequent designation by Menzies, 1962: 98. Diagnosis. Body smooth, or ornamented with tubercles, spines or ridges. Head with lateral incisions. Eyes present or absent. Pereonites with dorsal coxal plates visible dorsally on 5–7 only. Pereonite 7 tergite about 6 times as wide as long. Pleonites 1–3 free. Coxa 7 significantly smaller than coxa 6. Antenna 1 peduncle article 2 with or without anterodistal prolongation; article 3, 0.4–0.7 times as long as article 2. Antenna 2 peduncle, article 4 quadrate or linear, without a posterodistal lobe overlapping article 5; article 4, 1– 3 times as long as greatest width; article 5, 2– 8 times as long as greatest width. Mandibles without molar; incisor with 4 acute teeth on left, 5 uneven teeth on right; lacinia mobilis with concave, denticulate margin on left, about as broad as incisor and with 4 blunt teeth on right; spine row of denticulate spines. Maxillipedal palp of 4 articles, articles 4 and 5 free. Pereopod 1 with grossly widened propodus, about as wide as long, much wider than propodus of pereopods 2 and 3. Pereopods 2 and 3 basis anterior margin with setae along most of length, or with setae only on proximal half ( lilianae only); carpus posterodistal corner angular, not dominating propodus, or grossly produced as a lobe (about half as long as and dominating propodus), bearing long distal setae ( marcusi only); dactyli subchelate, half as long as propodus, or subchelate (closing on truncate palm), or a minute terminal hook. Pereopod 4 dactylus short, cylindrical, with a minute terminal seta, or vestigial, dome-like, with a minute terminal seta, or present as a short seta only. Pereopod 5 dactylus short, cylindrical, with a long terminal seta. Pereopod 6, 1.3 times as long as pereopod 5. Pereopod 7 dactylus short, cylindrical, with long terminal seta. Pleopod 2, appendix masculina straight, apex laterally denticulate (with 20 saw-like teeth) or strongly curved, laterally with minute setae. Uropod endopod half length of exopod. Oostegites 1 broad, overlapping, longer than broad; oostegites 2–4 almost circular, overlapping; oostegites 5 linguiform, reaching midline. Remarks. Macrochiridothea is differentiated from Chiriscus by the quadrate or linear article 4 of the antenna 2 peduncle that lacks a posterodistal lobe, the presence of dactyli on pereopods 2 and 3, and the short pereonite 7. : Published as part of Poore, Gary C. B., 2009, A new species of Chaetiliidae (Crustacea: Isopoda: Valvifera) from the Río de la Plata estuary, Argentina-Uruguay, and reconsideration of Macrochiridothea and Chiriscus, pp. 51-65 in Zootaxa 2119 on page 54, DOI: 10.5281/zenodo.188066 : {"references": ["Stebbing, T. R. R. (1914) Crustacea from Falkland islands collected by Mr. Rupert Valletin, F. L. S. Part II. Proceedings of the Zoological Society of London, 341 - 378, 9 pls.", "Nordenstam, A. (1933) Marine Isopoda of the families Serolidae, Idotheidae, Pseudidotheidae, Arcturidae, Parasellidae and Stenetriidae mainly from the South Atlantic. Further Zoological Results of the Swedish Antarctic Expedition, 1901 - 1903, 3, 1 - 284, 2 pls, errata.", "Sheppard, E. M. (1957) Isopod Crustacea Part II. The sub-order Valvifera. Families: Idoteidae, Pseudidotheidae and Xenarcturidae fam. n. With a supplement to isopod Crustacea, Part 1. The family Serolidae. Discovery Reports, 29, 141 - 197, pls 8, 9.", "Menzies, R. J. (1962) Reports of the Lund University Chile Expedition 1948 - 49. 42. The zoogeography, ecology, and systematics of the Chilean marine isopods. Lunds Universitets Arsskrift, 2, 1 - 162.", "Hurley, D. E. & Murray, R. H. (1968) A new species of Macrochiridothea from New Zealand, with notes on the idotheid subfamily Chaetilinae (Crustacea Isopoda: Valvifera). Transactions of the Royal Society of New Zealand (Zoology), 10, 241 - 249.", "Moreira, P. S. (1973) Species of Macrochiridothea Ohlin, 1901 (Isopoda, Valvifera) from Southern Brazil, with notes on remaining species of the genus. Boletim do Instituto Oceanografico, Sao Paulo, 22, 11 - 47.", "Jones, M. B. & Fenwick, G. D. (1978) Maoridotea naylori, a new genus and species of isopod (Valvifera, Idoteidae, Chaetilinae) from the Kaikoura Peninsula, New Zealand. Journal of Natural History, 12, 617 - 625.", "Poore, G. C. B. (1984) Clarification of the monotypic genera Chiriscus and Symmius (Crustacea: Isopoda: Idoteidae). Proceedings of the Biological Society of Washington, 97, 71 - 77.", "Harrison-Nelson, E. & Bowman, T. E. (1990) A range extension to the north for Macrochiridotea [sic] giambiagiae Torti and Bastida (Crustacea: Isopoda: Valvifera). Proceedings of the Biological Society of Washington, 103, 127 - 130.", "Carvacho, A. (1997) Redescripcion de Macrochiridothea setifer Menzies, 1962 y revision del genero Macrochiridothea Ohlin, 1901 (Isopoda: Valvifera: Idoteidae). Boletin Museo Nacional de Historia Natural, Chile, 46, 45 - 54."]}