Guitonia troglophila Garth & Iliffe, 1992

Jr, Robert Murray Lasley, Mendoza, Jose Christopher E. & Ng, Peter K. L., 2010, Two new species of Guitonia Garth & Iliffe, 1992 (Crustacea: Decapoda: Brachyura: Xanthidae) from the central and western Pacific Ocean, Zootaxa 2684, pp. 1-13 : 4

Guitonia troglophila Garth & Iliffe, 1992

( Figs. 1 E, F, 3G, H)

Guitonia troglophila Garth & Iliffe, 1992: 311 , figs. 1, 2. — Ng et al. 2008: 202 (list).

Material examined. Holotype female, 14.2 × 9.7 mm ( LACM CR 1987.167.1), anchialine cave, Grieta de Caleta la Torta, Santa Cruz Is., Galápagos Is., coll. T. M. Iliffe, 8 Jun. 1987.

Diagnosis. Anterolateral margin with teeth broad, lobate. Anterior regions of carapace with slight transverse rows of granules, almost indiscernible, not basally conjoined. Corneas, eyestalks reduced. Area lateral to the orbits with 2 granular ridges linking at level of exorbital angle, first anterolateral tooth, enclosing small, depressed area. Frontal margin angled toward posterior laterally, medial notch relatively large. Chelae unequal, dimorphic; dactylus of major chela with large basal tooth; outer surface of fixed finger, dactylus of minor chela granulated. Ambulatory legs relatively long, slender; distal end of merus of fourth ambulatory leg almost reaching last anterolateral tooth when apposed against carapace.

Remarks. It is noteworthy to note that in the original description of Guitonia, Garth & Iliffe (1992: 310) attribute a unique character to the genus: “Orbits failing to close externally at level of postorbital (first anterolateral) tooth, instead communicating by means of shallow trough or gutter with second anterolateral tooth.” Indeed, the figures ( Garth & Iliffe 1992: 312, fig. 1B, C) show this character in G. troglophila . A reexamination of the type specimen of G. troglophila , however, shows that this is not the case, and the orbits are typical of most xanthids ( Fig. 1 F). The original descriptions and figures are therefore incorrect in this respect. The orbital structures of G. paulayi n. sp., and G. leimomi n. sp., are also typical of most xanthids.

Distribution. Known only from the Galápagos Is.

Figures

FIGURE 1. Guitonia leimomi n. sp., holotype male, 15.5 × 9.7 mm (ZRC 2010.0277), Hawaiian Is., A, dorsal view, B, frontal view; Guitonia paulayi n. sp., holotype male, 11.2 × 7.3 mm (ZRC 2010.0278), Guam, C, dorsal view, D, frontal view; Guitonia troglophila Garth & Iliffe, 1992, holotype female, 14.2 × 9.7 mm (LACM CR 19871671), Galápagos, E, dorsal view, F, frontal view.