IUCN threat status:

Not evaluated

Comprehensive Description

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Description

Grapsus planifrons.

 

Nudus. Frons fere horizontalis, sat latus. Margo carapaces lateralis bene arcuatus, antero-lateralis bi-emarginatus. Epistoma brevissimum. Articulus maxillipedis externi 3tius vix longior quam latus. Pedes antici sat crassi, manu supra pustulatâ, extus infraque lævi; brachio apicem anticum 5-6 denticulato. Pedes 8 postici valde compressi, articulo 3tio pedis postici ad apicem inferiorem integro, articulo penultimo supra scabro.

 

Naked. Front nearly horizontal, rather broad; lateral margin of carapax arcuate, antero-lateral bi-emarginate. Epistome very short. Third joint of outer maxillipeds as long as broad. Anterior feet rather stout; hand above small postulate, externally and below smooth; arm with five or six teeth at anterior apex. Eight posterior feet much compressed, third joint of posterior pair entire at inferior apex; penult joint scabrous above.

 

Plate 21, fig.3a, animal, natural size; b, abdomen and sternum of male; c, outer maxillipeds, natural size; d, hand, natural size; e, spine of tarsus.

 

Valparaiso, Chili; Callao, Peru.

 

Length of carapax, seventeen and one-third lines; breadth, nineteen lines; length of front, six and three-fourths lines; breadth of front to front of præmedial areolets (which but slightly project), two and one-fourth lines. Colour, finely lined and spotted irregularly with brown-ish black or black, with intervening spaces a little yellowish.

 

Sides of carapax much arcuate. The species is near G. variegates; but according to Edwards’s description of that species, and the figure in Guerin’s “Iconographie.” It has the third joint of the outer maxillipeds much oblong, while in this species, the joint is not longer than broad.

 

The figure in the Voy. De l’Uranie, under Freycinet, pl. 76, f. 2, may be this species.”
(Dana, 1852)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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