Stenocercus Duméril and Bibron

Stenocercus Duméril and Bibron, 1837 (4): 349.

Type species (by monotypy): Stenocercus roseiventris Duméril and Bibron, 1837.

Trachycyclus Duméril and Bibron, 1837 (4): 355. Type species (by monotypy): Trachycyclus marmoratus Duméril and Bibron, 1837.

Proctotretus Duméril and Bibron, 1837 (4): 266. Type species (subsequent designation by Fitzinger, 1843): Proctotretus pectinatus Duméril and Bibron, 1837.

Heterotropis (Trachycyclus) Fitzinger, 1843: 71. Type species (by monotypy): Trachycyclus marmoratus Duméril and Bibron, 1837.

Steironotus (Stenocercus) Fitzinger, 1843:71. Type species (by monotypy): Stenocercus roseiventris Duméril and Bibron, 1837.

Scelotrema Tschudi, 1845:154. Type species: none designated.

Ptygoderus Gray, 1845:216. Type species (by monotypy): Proctotretus pectinatus Duméril and Bibron, 1837.

Ophryoessoides Duméril, in Duméril and Duméril, 1851:66. Type species (by monotypy): Ophryoessoides tricristatus Duméril, in Duméril and Duméril, 1851.

Brachysaurus Hallowell, 1856:232. Type species (by monotypy): Brachysaurus erythrogaster Hallowell, 1856.

Saccodeira Girard, 1857:197. Type species (by monotypy): Saccodeira ornatissima Girard, 1857.

Microphractus Günther, 1859 a:90. Type species (by monotypy): Microphractus humeralis Günther, 1859.

Scartiscus Cope, 1862:182. Type species (by monotypy): Scartiscus caducus Cope, 1862.

Tropidocephalus Müller, 1880:45. Type spe- cies (by monotypy): Tropidocephalus azur- eus Müller, 1880.

Diagnosis.— Stenocercus can be distinguished from other iguanian genera by the following combination of characters (Arnold, 1984; Boulenger, 1885 a; Frost and Etheridge, 1989; Frost, 1992; Frost et al., 2001 b): (1) maxillae do not articulate anteromedially posterior to palatal portion of premaxilla; (2) premaxillary spine not overlapped by nasals; (3) nasal concha fused to roof of nasal chamber; (4) jugal and squamosal not broadly juxtaposed; (5) parietal roof trapezoidal in shape; (6) parietal foramen in frontoparietal suture or absent; (7) supratemporal overlaps lateral aspect of supratemporal process of parietal; (8) nuchal endolymphatic sacs do not penetrate nuchal musculature; (9) labial blade of coronoid poorly developed or absent; (10) anterior surangular foramen dorsal to posteriormost extent of dentary; (11) marginal teeth pleurodont; (12) palatine teeth absent; (13) posterior coracoid fenestra present; (14) anterior process of interclavicle poorly developed or absent; (15) posterior process of interclavicle anterior to contact with sternum long; (16) sternal ribs three; (17) interparietal scale not enlarged; (18) gular scales imbricate posteriorly; (19) gular fold incomplete medially; (20) femoral pores absent; (21) preanal pores absent; (22) hemipenes weakly bilobate, with distinctly divided sulci; (23) hemipenial sheath musculature extensive; (24) hemipenial dorsal accessory muscle absent; (25) colic septa absent.