Circulium rotundatum Naruse & Ng 2020, comb. nov.
Authors/Creators
Description
Circulium rotundatum (Hess, 1865), comb. nov.
(Figures 5, 6)
Sesarma rotundata Hess, 1865, p. 149, pl. 6, fig. 9 [type locality: ostensibly Sydney]; Miers 1877, p. 136 (part); Haswell 1882, p. 108; De Man 1896, p. 110, pl. 3, fig. 6, 6a.
Sesarma dentifrons A. Milne-Edwards 1869, p. 31 [type locality: Samoa]; De Man 1896, p. 110, pl. 3, fig. 7, 7a, b.
Sesarma oceanica De Man, 1889, p. 429, pl. 10, fig. 9 [type locality: Ponape Island].
Sesarma gardineri Borradaile, 1900, p. 593, pl. 42, fig. 8 [type locality: Funafuti and Rotuma islands].
Sarmatium faxoni Rathbun, 1906, p. 841, pl. 7, fig. 1 [type locality: O’ahu, Hawaiian Islands, and Marshall Islands].
Sesarma (Sesarma) rotundatum: Rathbun 1907, p. 33.
Labuanium rotundatum: Serène and Soh 1970, p. 401; Davie 2002, p. 221; Ng and Liu 2003, p. 614 (part), fig. 8E–I; Ng et al. 2008a, p. 221 (list); Ng and Davie 2011, p. 43 (part); Ng 2012, p. 266, figs 1–7 [neotype designated; type locality: Niuafou Island].
Material examined
Neotype. USNM 1150304, male, 36.3 × 36.3 mm, Niuafou Island, Tonga, coll. H.C. Kellerr, Naval Eclipse Expedtion, 29 September 1930.
Others. ZRC 2002.0453, 1 male, 24.4 × 23.7 mm, Swain’s Island, coll. Itasca Expedition, March 1936; ZRC2012.0398, 5males,19.7× 20.1–28.8× 30.9 mm, 3females,23.8 ×24.7–30.0 × 31.6 mm, on trees, Renipiua Island,small island on the southern end of Pohnpei atoll,ca. 6.7449°N, 157.953° E, coll. T. Herman via B. Lynch, caught at night using headlamps, 2 July 2011.
Diagnosis
Two pairs of postfrontal lobes present, lateral lobes exceeding mesial lobes anteriorly, anterior edge of lobes close to but never reaching frontal margin in dorsal view. Epistome posterior margin with 3 low lobes, lateral lobes terminally directed anteroventrally, median lobe terminally directed anteriorly. Chela outer surface sparsely covered with large granules; upper surface with 1 complete longitudinally traversing row of small granules. G1 relatively more slender, relatively long, straight proximally, distally bent about 60–80° against main axis; distal beak-like and corneous process relatively long, narrow. Sternal vulval cover covering almost entire vulva, produced anteroventrally as trigonal pyramid projection.
Colouration
In life, carapace and pereopods uniformly yellow to orange; eyes white; chelae orange to yellow, with white fingers (Ng 2012, fig. 1).
Distribution
South Pacific: Cook Islands (Ng 2012); American Samoa (Ng 2012); Samoa (Milne-Edwards 1869); Tonga (Ng 2012) [type locality: Niuafou Island]; Funafuti and Rotuma Islands (Borradaile 1900). Micronesia: Marshall Islands (Rathbun 1906, 1907); Pohnpei (De Man 1889). Ostensibly Sydney, Australia (see McCulloch 1913, p. 323; Davie 2002, p. 221; Ng 2012, p. 268). The record from O’ahu, Hawaiian Islands (Rathbun 1906, as Sarmatium faxoni) has been questioned (see Ng 2012).
Ecological note
The species has nocturnal habits and has been found on large trees, including coconut trees, living in the foliage (Brian Lynch, personal communication).
Notes
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- T , USNM
- Material sample ID
- USNM 1150304 , ZRC 2002.0453, ZRC2012.0398
- Event date
- 1930-09-29
- Verbatim event date
- 1930-09-29
- Scientific name authorship
- Naruse & Ng
- Kingdom
- Animalia
- Phylum
- Arthropoda
- Order
- Decapoda
- Family
- Sesarmidae
- Genus
- Circulium
- Species
- rotundatum
- Taxon rank
- species
- Taxonomic status
- comb. nov.
- Type status
- neotype
- Taxonomic concept label
- Circulium rotundatum (Hess, 1865) sec. Naruse & Ng, 2020
References
- Hess W. 1865. Beitrage zur Kenntnis der Decapoden-Krebse Ost-Australiens. Arch Naturg. 36: 127 - 173, pls. 1, 2.
- Miers EJ. 1877. On a collection of Crustacea made by Rev. G. Brown, C. M. Z. S., on Duke-of-York Island. Proc Zool Soc London. 1877: 133 - 139.
- Haswell WA. 1882. Catalogue of the Australian stalk- and sessile-eyed Crustacea. Sydney: Australian Museum.
- De Man JG. 1896. Ueber neue und wenig bekannte Brachyuren des Hamburger und Pariser Museums. Mitt Naturh Mus Hamburg. 13: 75 - 118, 3 pls.
- Milne-Edwards A. 1869. Notes sur quelques nouvelles especes du genre Sesarma (Say). Nouv Arch Mus Hist Nat Paris. 5: 25 - 31.
- De Man JG. 1889. Uber einige neue oder seltene indopacifische Brachyuren. Zool Jahrb Abt Syst Geogr Biol Thiere. 4: 409 - 452, pls. 9 - 10.
- Borradaile LA. 1900. On some crustaceans from the south Pacific. Part IV. The crabs. Proc Zool Soc London. 1900: 568 - 596, pls. 40 - 42.
- Rathbun MJ. 1906. The Brachyura and Macrura of the Hawaiian Islands. Bull Bur Fisheries. 23 (3): 827 - 930, pls. 1 - 24.
- Rathbun MJ. 1907. Reports on the scientific results of the expedition to the tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish Commission steamer " Albatross, " from August, 1899, to March, 1900, Commander Jefferson F. Moser, U. S. N., commanding. IX. Reports on the scientific results of the expedition to the eastern tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish Commission steamer " Albatross, " from October, 1904, to March, 1905, Lieut. - Commander L. M. Garrett, U. S. N., commanding. X: the Brachyura. Mem Mus Comp Zool Harv Coll. 35 (2): 25 - 74.
- Serene R, Soh CL. 1970. New Indo-Pacific genera allied to Sesarma Say, 1817 (Brachyura, Decapoda, Crustacea). Treubia. 27 (4): 387 - 416.
- Davie PJF. 2002. Crustacea: Malacostraca. Eucarida (Part 2): Decapoda-Anomura, Brachyura. In: Wells A, Houston WWK, series editors. Zoological Catalogue of Australia. 19.3 B. Melbourne: CSIRO Publications; p. 641.
- Ng PKL, Liu HC. 2003. On a new species of tree-climbing crab of the genus Labuanium (Crustacea: Decapoda: Brachyura: Sesarmidae) from Taiwan. Proc Biol Soc Wash. 116 (3): 601 - 616.
- Ng PKL, Guinot D, Davie PJF. 2008 a. Systema Brachyurorum: part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bull Zool Suppl. 17: 1 - 286.
- Ng PKL, Davie PJF. 2011. Labuanium vitatum (Crustacea: Decapoda: Brachyura: Sesarmidae), a new Indo-West Pacific species of arboreal crab. Zootaxa. 2889: 35 - 48. doi: 10.11646 / zootaxa. 2889.1.2
- Ng PKL. 2012. The identity of Sesarma rotundata Hess, 1865, and description of a new species of arboreal crab of the genus Labuanium Serene & Soh, 1970, from Guam, western Pacific (Crustacea: Decapoda: Brachyura: Sesarmidae). Raffles Bull Zool Suppl. 25: 265 - 277.
- McCulloch AR. 1913. Studies in Australian Crustacea. No. 3. Rec Aust Mus. 9: 321 - 353, pls. 10, 11. doi: 10.3853 / j. 0067 - 1975.9.1913.929