Glyptoxanthus

Mendoza, Jose Christopher E. & Guinot, Danièle, 2011, Revision of the genus Glyptoxanthus A. Milne-Edwards, 1879, and establishment of Glyptoxanthinae nov. subfam. (Crustacea: Decapoda: Brachyura: Xanthidae), Zootaxa 3015, pp. 29-51 : 34

Key to species of Glyptoxanthus

1. Carapace regions 2M and 3M fully or partially fused........................................................ 2

- Carapace regions 2M and 3M completely separated from each other by wide or narrow groove........................ 7

2. 3M fused to internal part of 2M throughout most of its length; cervical and branchio-cardiac grooves wide, deep; gastric and branchial regions poorly subdivided, vermiculations distinctly anastomosing, reticulate..................... G. co rro sus

- 3M fused to internal part of 2M only posteriorly............................................................ 3

3. 2M completely divided longitudinally; vermiculations smooth, punctuated by small, round cavities......... G. labyrinthicus

- 2M incompletely divided longitudinally, rarely not divided at all............................................... 4

4. 2M clearly but partially divided longitudinally, inner and outer branches fused anteriorly; 1P with 2 parallel, transverse furrows................................................................................................... 5

- 2M not clearly divided longitudinally; 1P punctuated with several small, subcircular cavities, never with parallel transverse furrows............................................................................................. 6

5. Carapace vermiculations relatively thin, simple, the intervening furrows wide; large, oblongate cavity on 5L… G. meandrinus

- Carapace vermiculations relatively thick, anfractuous, intervening furrows narrow; no large, oblongate cavity on 5L. ............................................................................................... G. vermiculatus

6. Carapace vermiculations consisting of fused, small, rounded lobules arranged in linear fashion, or clustered in small circles which resemble “doughnuts”; lobules immediately posterior to 1P thick, subcircular to oblong............. G. angolensis

- Carapace vermiculations continuous within each subregion, more regular, symmetric; lobules immediately posterior to 1P thinner, irregular in shape........................................................................ G. erosus

7. Vermiculations and lobules on carapace, thoracic sternum, abdomen and pereopods appearing rough due to several individual, round granules, only partially fused at bases, clearly visible under low magnification..................... G. meandricus

- Vermiculations and lobules relatively smooth............................................................... 8

8. Carapace vermiculations thick, petaloid, some assuming a “four-leaf clover” shape; intervening furrows narrow; X-shaped 2P region divided into separate lobules; anterior thoracic sternum weakly eroded, with scattered oblique fissures, particularly on posterior parts.............................................................................. G. cavernosus

- Carapace vermiculations convoluted; intervening furrows relatively wider; X-shaped 2P region entire; anterior thoracic ster- num much eroded, forming regular and symmetric patterns of ridges and cavities......................... G. hancocki