Bucerotidae
Aceros cassidix brevirostris
Van Bemmel, in Van Bemmel & Voous, 1951: 56
Knobbed Hornbill
1 holotype, 3 paratypes
Holotype: ZMA 8701, adult male, Labasa (Muna I., off SE Sulawesi, Indonesia), collected on 6 Oct 1948 by G.A.L. de Haan (coll. nr. 625); wing 406, tail 274, bill to front of casque 131, to rear base of casque 238, tarsus c. 61.5.
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Paratype: ZMA 9275, adult male, Labasa, collected on 9 Oct 1948 by De Haan (coll. nr. 664); wing 410, tail 278, bill to front of casque 120, to rear base of casque 220, tarsus c. 58.
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Paratype: ZMA 9276, adult female, Labasa, collected on 9 Oct 1948 by De Haan (coll. nr. 661); wing 377, tail 247, bill to front of casque 97, to rear base of casque 178, tarsus distorted.
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Paratype: ZMA 9277, adult female, Butung I. (off SE Sulawesi, Indonesia), collected on 25 Sep 1948 by De Haan (coll. nr. 505); wing 388, tail 263, bill to front of casque 103, to rear base of casque 187, tarsus c. 58.
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Additional information
Next to the type, the original series examined consisted of 10 males and 6 females, collected on both Muna and Butung by J. Elbert in Jul-Aug 1909 and by G.A.L. de Haan in Sep-Oct 1948. Elbert's five birds are probably all in the MZB, as none of the Elbert birds in SMF appear to have been examined; of De Haan's other 11 birds, three are in the ZMA (listed above) and the remainder apparently in the MZB. Van Bemmel & Voous (1951) list biometrical data for some Sulawesi populations of this species, and based on this, Kemp (1988) concluded that the variation was clinal and brevirostris invalid; however, the data from populations from the centre, south, and south-east of Sulawesi presented by Van Bemmel & Voous (1951) are very sparse, and the few birds from here still seem to match nominate cassidix in size or are close to it, the alleged clinal variation being doubtful.
Measurements
As far as types in the ZMA are concerned, all measurements were taken by C.S. Roselaar, unless otherwise noted, using the methods as described in Svensson (1992) and comparable with the data published in the Handbook of Western Palearctic Birds. All are in mm, and are given to the nearest mm when taken with a ruler and to one-tenth of a mm when measured with calipers.
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> Literature references
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