Short-toed Coucal

Here the details of the Short-toed Coucal named bird below:

SCI Name:  Centropus rectunguis
Protonym:  Centropus rectunguis Proc.Zool.Soc.London(1846) (1846), Pt14 no.165 p.104
Taxonomy:  Cuculiformes / Cuculidae / Centropus
Taxonomy Code:  shtcou1
Type Locality:  Malacca.
Author:  Strickland
Publish Year:  1847
IUCN Status:  Vulnerable

DEFINITIONS

CENTROPUS
(Cuculidae; Ϯ Senegal Coucal C. senegalensis) Gr. κεντρον kentron  spur, spike; πους pous, ποδος podos  foot; "This genus is distinguished from all other members of the family by having on the hallux a long nearly straight hind claw, very much like a Lark's." (Blanford 1895).  The coucals were formerly known as 'lark-heeled cuckoos.'  The substantive 'Coucal' is derived from French Coucou  cuckoo, and Alouette  lark; "GENUS 13. CENTROPUS (κεντρον stimulus, calcar  πους pes) (Spornfuß Germ.) Rostrum capiti brevius, incurvum, valde compressum, grypanium.  Tomia integerrima.  Nares plumis recumbentibus tectae.  Lingua . . .  Cauda gradata, elongata.  Pedes scansorii, congrui. Digiti externi internis longiores, antici fissi, posticorum externus versatilis? Ungues incurvi, posticus internus reliquis aliquantum longior, retiusculus, subulatus.  Species: Cuculus Aegyptius, Tolu LinGmel." (Illiger 1811); "Centropus Illiger, Prodromus, 1811, p. 205. Type, by subsequent designation, Cuculus aegyptius Gmelin. (G. R. Gray, List Gen. Bds., 1840, p. 56.)" (Peters, 1940, IV, p. 66). 
Var. Certropus, Certtopus, Centrophus. 
Synon. Anacentropus, Centrococcyx, Corydonyx, Grillia, Huhus, Megacentropus, Nesocentor, Nisus, Onixylus, Polophilus, Pyrrhocentor, Toulou.

rectunguis
L. rectus  straight  < regere  to guide; unguis  claw, nail.