Order: Primates
Family: Cercopithecidae

1) General Zoological Data

The name mandrill, suggests Gotch (1979), derives from “man” and “drill”, Western African names for baboons. The most closely related species, the drill ( Mandrillus leucophaeus) is larger and perhaps even less common. Tutin et al. (1997) observed a variety of diurnal primates in the wild at Lope , Gabon , especially for their food preferences. Fruits were the primary resource, except during their scarcity periods in the dry season. Mandrills inhabit primarily Western Africa/Gabon and Cameroon (Matthews & Matthews, 2002).

	Mandrill at San Diego Zoo.

2) General Gestational Data

Wickings & Dixson (1992) observed the breeding patterns of a group of free-ranging mandrills in Gabon and determined that sexual maturity of females begins between 2.75 and 4.5 years and first delivery occurs at age 3.25 years. The gestation period varied between 152 and 176 days with an interbirth interval of 11-15 months. They also reported that males (30-35 kg at maturity) developed more slowly than females (10-15 kg). Generally singletons are produced after a 167 +/- day gestation. Singletons are the rule but, while occasional baboon twins have been reported, no mandrill twins are listed in the accumulated data collected by Geissmann (1990).This full term newborn whose placenta was available weighed 825 g. The placenta weighed 150 g and had a 27 cm long umbilical cord with three vessels and no ducts.

3) Implantation

The early stages of embryogenesis and placentation are presumably essentially the same as in baboons (Hendrickx, 1971) and these are reviewed in the chapter on macacs (see “rhesus monkey” chapter).

4) General Characterization of the Placenta

As in baboons, the mandrill placenta consists of a single disk. The placenta resembles closely that of baboons and rhesus monkeys, as far as their villous structure is concerned. Cotyledons are not grossly visible. Mandrills have a villous, hemochorial type of placentation.

This placenta comes from a term gestation with neonatal demise and was the product of a female that died from disseminated tuberculosis and weighed 150 g. Placenta and fetus had no evidence of tuberculosis.

5) Details of fetal/maternal barrier

The fetal capillaries abut and occasional indent the trophoblastic surface. Despite this being a term gestation, cytotrophoblast (“Langhans' cells”) was occasionally still visible beneath the syncytial cover of the villi. There were no mitoses. The villi are composed of connective tissue and contain scattered macrophages (Hofbauer cells).

6) Umbilical cord

The umbilical cord of this placenta was inserted eccentrically and was 27 cm long. It contained two arteries and one vein. There were no ducts and no twists of the cord. The surface was composed of a thin layer of amnionic epithelium. The Hyrtl anastomosis is much the same as in other cercopithecid and human placentas (see chapter on rhesus monkey; Houston & Hendrickx, 1968).

7) Uteroplacental circulation

See chapter on rhesus monkey in which much the same vascularization prevails.

8) Extraplacental membranes

9) Trophoblast external to barrier

Cytotrophoblast (“extravillous trophoblast”) infiltrates the deciduas basalis and its vessels. I have no preparations of the uterus to determine whether there is Myometrial invasion.

10) Endometrium

There is typical decidualization of the mandrill endometrium during pregnancy. This has recently been studied in baboons with the recognition of the “pivotal role” in extracellular matrix remodeling by matrix metalloproteinases (Strakova et al., 2003). Moreover, there is extensive infiltration of round cells in the developing decidua that has been studied in the (probably similar reaction of) rhesus monkey (Sluvkin et al., 2004). It is presumed that these cells (NK cells and T-cells) are of importance in immune regulation of the infiltrating trophoblast.

Fazleabas et al. (1999) created the endometrial plaque of implantation in baboons by hCG administration and determined the endometrial changes then induced by additional steroid application. Pepe & Albrecht (1995) provided an extensive review of adrenal steroids (fetal and maternal) in catarrhine pregnancies and their modulation by placental enzymes.

11) Various features

No special features are recognized.

12) Endocrinology

Wickings & Dixson (1992) determined testosterone values of adult males to be 8.17 ng/ml. Siler-Khodr et al. (2003) examined the effect of GnRH on progesterone release from granulose cell cultures of baboons. The possible regulation of chorionic somatomammotropin release from syncytiotrophoblast by estrogens was studied in baboons by Musicki et al. (2003). They found suppression in the first trimester.

13) Genetics

Mandrills, like baboons, have 42 chromosomes. Chromosome 13 has a major secondary constriction proximal to the centromere. Rubio-Goday et al. (1976) compared the G-banding patterns of Mandrillus (P.) sphinx chromosomes with that of Macaca fascicularis whose chromosome number is also 2n=42. Only one pair showed a small pericentric inversion polymorphism. Lucotte & Jouventin (1980) compared electrophoretic patters between Mandrill and Drill ( Mandrillus leucophaeus ) and detected 30% differences of their bands. An extensive study of DNA fingerprints (GTG 5 short tandem repeat sequences and minisatellites) was carried out at the Franceville Center in Gabon by Wickings (1995). This colony has had a spectacular breeding success and the breeding hierarchy was ascertained by this methodology. Gray (1972) lists a number of hybrids. Mandrillus sphinx and Mandrillus leucophaeus have hybridized many times, and several Papio hybrids have also been reported. Also, a few hybrids with macacs and mangabeys are on record but most did not survive and nothing about the possible fertility of hybrids is known.

Divergence found in the composition of the cytochrome b gene of known-origin mandrills allowed identification of populations that were separated by a large river in Gabon (Telfer et al., 2003). This also correlated with the distribution of two immunodeficiency viruses of these populations.

14) Immunology

The immune response to infection with irradiated Loa loa larvae was reported by Ungeheuer et al. (2000).

15) Pathological features

Placental infarcts are common in the placentas of cercopithecids and were also found in this placenta. They are not accompanied by symptoms suggesting pre-eclampsia, as would be the case in human gestations. While thrombosed decidual vessels can be seen in such placental floors, their walls are not altered as is the case in humans with similar pathology.

Remarkably, Johnson et al. (1998) reported a fatal case of coccidioidomycosis in a mandrill colony held in Texas . Of greater interest perhaps is the designation of a free-living ameba as Balamuthia mandrillaris (Visvesvara et al., 1993; 1990) which was first identified in a mandrill at San Diego Zoo and has features that differ from those of unlike Acanthamoeba and Naegleria known to cause encephalitis. It has also caused encephalitis in gorilla and Colobus monkeys (Rideout et al., 1997) and humans (Denney et al., 1997). Its genotypic characteristics were studied by Booton et al. (2003). Paratuberculosis due to Mycobacterium avium infection was the cause of death in a 2 ½ y.o. mandrill reported by Zwick et al. (2002). Echinococcosis caused death of a mandrill reported by Boever & Britt (1975). Encephalomyocarditis virus infection was fatal to three mandrills and several other animals at the Taronga zoo in Sydney , Australia (Reddacliff et al., 1997). Mandrills are also carriers of lentiviruses (SIV) (Pandrea et al., 2003) and the virus is transmitted to humans in the African bushmeat pandemic (Wolfe et al., 2004).

16) Physiologic data

Lin et al. (1988) determined the structure of mandrill hemoglobin chains and compared them with other cercopithecids. They thus suggested placement of mandrills between macacs and baboons. Peinado et al. (1996) published hematologic values of mangabeys and mandrills and found them to be essentially similar to other cercopithecids. Zachos et al. (2004) deprived (or supplemented) gestations of estrogens and showed a decrease of fetal oocytes in the deprived animals. They proposed that the microvillous surface of oocyte development is regulated by estrogens.

17) Other resources

Cell strains of fibroblast cultures are available from CRES at San Diego Zoo by contacting Dr. Oliver Ryder at oryder@ucsd.edu .

18) Other remarks – What additional Information is needed?

Definitive stages of mandrill implantation and their early development are missing. Also, little specific endocrine data are published.

Acknowledgement

The animal photograph in this chapter comes from the Zoological Society of San Diego.

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