Danarma obtusifrons ( Dana, 1851 )

Schubart, Christoph D. & Ng, Peter K. L., 2020, Revision of the intertidal and semiterrestrial crab genera Chiromantes Gistel, 1848, and Pseudosesarma Serène & Soh, 1970 (Crustacea: Brachyura: Sesarmidae), using morphology and molecular phylogenetics, with the establishment of nine new genera and two new species, Raffles Bulletin of Zoology 68, pp. 891-994 : 922

publication ID

https://doi.org/ 10.26107/RBZ-2020-0097

publication LSID

lsid:zoobank.org:pub:815E4670-B063-4FD8-B31E-3AD89B3A7942

DOI

https://doi.org/10.5281/zenodo.6525261

persistent identifier

https://treatment.plazi.org/id/49152B56-FFFE-BA3E-FF31-FEADFA21FDC4

treatment provided by

Diego

scientific name

Danarma obtusifrons ( Dana, 1851 )
status

 

Danarma obtusifrons ( Dana, 1851) View in CoL

( Figs. 13A View Fig , 14A View Fig , 18A View Fig , 19A–C, F–I View Fig , 43E View Fig )

Sesarma obtusifrons Dana, 1851: 250 View in CoL ; Dana, 1852: 355, pl. 22, fig. 9; H. Milne Edwards, 1853: 183; De Man, 1887: 644; Lenz, 1901: 472; Titcomb et al., 1979: 367; Godwin & Bolick, 2006: 39, 49.

Sesarma (Holometopus) obtusifrons View in CoL – Rathbun, 1906: 840; 1907: 35; Tesch, 1917: 179 (part); Edmondson, 1946: 306, fig. 183e; Edmondson, 1959: 185, figs. 13c, 17c; Serène, 1968: 107 (part).

Chiromantes obtusifrons View in CoL – Ng & Liu, 1999: 230.

“ Chiromantes ” obtusifrons View in CoL – Ng et al., 2008a: 220, 224 (part); Castro, 2011: 120 View Cited Treatment ; Davie & Ng, 2013: 2, figs. 1, 4A, 5A, B, 6A, B, 7A, B, 8A, 9A, B, 10A, 11.

Incertae sedis [see remarks later] (see Davie & Ng, 2013: 7)

Sesarma (Sesarma) obtusifrons View in CoL – De Man, 1895: 161; De Man, 1898: pl. 29, fig. 31.

Material examined. 2 males (16.8 × 12.9 mm, 19.7 × 14.7 mm) ( ZRC 2002.0220 View Materials , ex. BPBM-266), Malaikahana, Oahu, Hawaii, C.M. Cooke et al., 8 July 1916 ; 1 male (17.7 × 13.2 mm), 1 female (15.7 × 11.6 mm) ( UF-FLMNH 14837 ), 21.2833°N 157.667°E, Coco Head, Oahu, Hawaii, coll. G. Paulay et al., October 2006 GoogleMaps .

Diagnosis. Carapace transversely rectangular, ca. 1.3 times broader than long; dorsal carapace, lateral branchial regions weakly convex, not prominently swollen; external orbital tooth with outer margin broadly convex so greatest carapace width clearly posterior to external orbital tooth; front ca. 0.65 times carapace width, margin broadly convex in frontal view with medial part relatively straight in dorsal view, beaded with row of small but distinct granules, with pair of low lateral swellings behind margin; supraorbital margin entire, semicircular; dorsal surface of cheliped carpus covered in small but conspicuous granules; ambulatory legs relatively short; third ambulatory merus ca. 2.2 times longer than wide; fifth ambulatory merus ca. 2.3 times longer; fourth ambulatory propodus ca. 2.2 times longer; male pleon moderately broad; somite 6 with distolateral margins strongly divergent, relatively straight over distal two-thirds; somite 3 width 2.9 times basal width of telson; G1 relatively slender, weakly tapering to obtusely angled subdistal shoulder; distally slender, strongly bent to 45° angle; distal chitinous process long, with slender narrow apex, dorsal margin slightly concave. (After Davie & Ng, 2013: 2).

Colour. “Background colour of carapace, legs fawn to bluish gray, covered in fine darker speckling with scattering of slightly larger irregular spots. Legs with darker, broad transverse bands that are more noticeable on the carpi and meri. Chelipeds dorsally similar in colour to carapace and legs but becoming greyish white in frontal and ventral view. Ocular peduncles and corneas pale, similar to carapace in colour.” ( Davie & Ng, 2013: 5; fig. 1).

Remarks. This characteristic species has been reported from a wide area from the eastern Indian Ocean to Hawaii (type locality). Davie & Ng (2013) revised the taxonomy of the species and recognised four new species. All these species share the diagnostic generic features of the genus. Although the type(s) of Sesarma obtusifrons Dana, 1851 , are almost certainly lost, Davie & Ng (2013) argued that there was no need to designate a neotype as the species is distinctive and easily distinguished for all known congeners.

Biology. “ Edmondson (1959) noted that C. obtusifrons was found intertidally and “even above the high water mark”, and Paulay & Starmer (2011: 11) reported finding it living in a supratidal boulder field on O‘ahu.” ( Davie & Ng, 2013: 7).

Distribution. Known only from Hawaii ( Davie & Ng, 2013).

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Sesarmidae

Genus

Danarma

Loc

Danarma obtusifrons ( Dana, 1851 )

Schubart, Christoph D. & Ng, Peter K. L. 2020
2020
Loc

“ Chiromantes ” obtusifrons

Davie PJF & Ng PKL 2013: 2
Castro P 2011: 120
Ng PKL & Guinot D & Davie PJF 2008: 220
2008
Loc

Chiromantes obtusifrons

Ng PKL & Liu HC 1999: 230
1999
Loc

Sesarma (Holometopus) obtusifrons

Serene R 1968: 107
Edmondson CH 1959: 185
Edmondson CH 1946: 306
Tesch JJ 1917: 179
Rathbun MJ 1906: 840
1906
Loc

Sesarma (Sesarma) obtusifrons

Man JG De 1895: 161
1895
Loc

Sesarma obtusifrons

Godwin S & Bolick H 2006: 39
Titcomb M & Fellows DB & Pukui MK & Devaney DM 1979: 367
Man JG De 1887: 644
Milne Edwards H 1853: 183
Dana JD 1852: 355
Dana JD 1851: 250
1851
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