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White-headed Marmoset - Callithrix geoffroyi
#1
White-headed Marmoset - Callithrix geoffroyi

[Image: Callithrix_geoffroyi.jpg]

Scientific classification 
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Family: Callitrichidae
Genus: Callithrix
Species: C. geoffroyi

Description: It measures around 50 centimeters, of which more than half belongs to the tail that weighs 300 to 400 grams. It is distinguishable by the white head and neck, with two black tufts under the ears and a bare pink around the mouth and eyes that are light brown. The hair, legs and tail are black while in the back it is orange and gray with black and white bands. The tail has gray rings.

Distribution: This animal is endemic to the Mata Atlantica of the Brazilian states Espírito Santo, Minas Gerais and Rio de Janeiro. It is also found on the island of Santa Catarina on the coast of the state of Santa Catarina.

[Image: White-headed_Marmoset_area.png]

Behavior: It is a diurnal and arboreal monkey that move in groups of 3 to 8 individuals in a territory of 5 hectares. Its diet is based on insects and fruits. It is one of the most reproduced marmosets in captivity the dominant female tends to be monogamous. The gestation lasts about four and a half months and two offspring are born per litter. Its life expectancy is 10 years in its wild habitat.

[Image: Callithrix_geoffroyi_2.jpg]
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  • Claudiu Constantin Nicolaescu, theGrackle
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#2
Predator of Callithrix geoffroyi.

At 0800 h on 16 August 2016 in Barra do Sahy, in the municipality of Aracruz, in the state of Espírito Santo, southeastern Brazil (19.863770°S, 40.086831°W, WGS 84; 7 m elev.) we captured an adult female B. leucurus (SVL = 108.0 cm) that regurgitated an adult Callithrix geoffroyi (White-faced Marmoset; total body length = 45 cm; Fig. 1A,B) that had been ingested headfirst. In general, C. geoffroyi is arboreal, but these primates often move 
through the shrub layer or even come to the ground (Rocha and Passamani 2009. Bol. Mus. Biol. Mello Leitão 26:47–58), which might account for the predation of this monkey by a predominantly terrestrial snake. We collected the marmoset as a voucher specimen and deposited it at the National Atlantic Forest Institute in Santa Teresa, Espírito Santo (MBML 3630). The second event occurred at 1100 h on 15 November 2016 at the margin of 
the Vale Nature Reserve in the municipality of Linhares, Espírito Santo, Brazil (19.153023°S, 39.892335°W, WGS 84; 15 m elev.). In this case, we collected a juvenile B. leucurus (SVL = 44.3 cm) during an active search. When the specimen was dissected, we found an adult colubrid snake, Thamnodynastes nattereri (SVL = 33.0 cm; Fig. 1C), that had been ingested headfirst. Although ophiophagy has been recorded in B. leucurus (Baptista et al., op. 
cit.; Fagundes et al., op. cit.), it is a relatively rare behavior. The B. leucurus and T. nattereri specimens were collected and deposited at the National Atlantic Forest Institute in Santa Teresa, Espírito Santo (number: MBML 3908).

[Image: 1pVYueK.png]
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  • Claudiu Constantin Nicolaescu
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