Morphological description of male genital organs of Marca's marmoset (Mico marcai)

Abstract

Morphological characterisation of the genital organs of primates may bring significant contributions to the understanding of different reproductive behaviours and support new conservation strategies. However, relevant or detailed descriptions of genital morphology of several primate species are still lacking. This study describes the gross and microscopic anatomy of the internal and external genitalia of Marca's marmoset (Mico marcai). The same organs described in other primate species were identified here, but some anatomical particularities were detected, such as absence of a dartos tunic, presence of a vas deferens ampulla, absence of spongious erectile tissue in the pelvic urethra, separation of prostate gland lobes by a longitudinal sulcus and lack of septation in the corpus cavernosus and spongiosus at the level of the shaft and free portion of the penis. Keratinised type 1 spicules arising from epidermal or dermal projections were found in the free portion of the penis. Microscopic analysis revealed a small bone (baculum) consisting of peripheral compact bone and a central, non-ossified area filled with vascular tissue at the distal end of this portion of the penis. Results of this study may support further comparative studies of primates' reproductive ecology.

Male genital organs of the black‐crowned dwarf marmoset (Callibella humilis)

“…Like in Callimico goeldii (Hill, 1959) and M. marcai (Siqueira et al, 2018), the tail of the epididymis in C. humilis was round and smaller than the head, whereas the body was narrow and slender.…”

Morphology of the male reproductive tract of Eira barbara

“…There is no division into lobes; rather, the gland has a spherical shape in a single lobe (Machado et al,2012). Differing to the Micomarcai that have two lobes in prostate gland, a dorsocranial and a dorsolateral, and had ampullar gland (Siqueira et al, 2018). The prostate glands of the E .…”

“…The findings regarding the presence of the baculum are similar to those of Martucci et al (2011) and as expected when comparing the microstructure to those of canine and domestic feline baculums, as well as some rodent species, although the spoon shape was a unique finding (Rocha‐Barbosa et al, 2013). The baculum was found microscopically in Micomarcai but non‐ossified (Siqueira et al, 2018). In Cebus apella (Teixeira et al, 2015) is formed by compact bone tissue with a non‐ossified area filled with mesenchymal cells and osteoblasts.…”

comparative morphological study of the accessory sex glands of immature and mature local breed donkey (Equus asinus)

“…In canine and feline species the number of accessory sex gland was the fewer which recorded only the ampulla of ductus deferens and prostate glands (Abood et al, 2019;Ozkadif et al, 2009;Johnston,2001;Dimitrov et al, 2010;Dyce et al, 2009). Also in monkey there are the ampulla and prostate (de Siqueira et al, 2018). Our result showed that the shape, position and relation of the ampulla of ductus deferens is similar to those recorded in other mammals especially it well developed in dog (Budras, 2010), in tom cat (Abood et al,2019), in male indigenous gazelle (Gazella subgutturosa) (Mohammed and Doohi 2017), in monkey (Ramos, 1979), in Marca's marmoset (Mico marcai), (de Siqueira et al, 2018), in bull (Hassan, 2021), in ram, red sokoto buck and one-humped camel bull (Mahmud et al, 2016), in ram (Ovis aris) and buck (Caprus hircus) (Khalaf, 2009), in camel, while absents of ampulla is recorded by cats and boar (Frandson et al, 2009;Dyce et al, 2009).…”

“…Also in monkey there are the ampulla and prostate (de Siqueira et al, 2018). Our result showed that the shape, position and relation of the ampulla of ductus deferens is similar to those recorded in other mammals especially it well developed in dog (Budras, 2010), in tom cat (Abood et al,2019), in male indigenous gazelle (Gazella subgutturosa) (Mohammed and Doohi 2017), in monkey (Ramos, 1979), in Marca's marmoset (Mico marcai), (de Siqueira et al, 2018), in bull (Hassan, 2021), in ram, red sokoto buck and one-humped camel bull (Mahmud et al, 2016), in ram (Ovis aris) and buck (Caprus hircus) (Khalaf, 2009), in camel, while absents of ampulla is recorded by cats and boar (Frandson et al, 2009;Dyce et al, 2009). The current study suggest that the ampulla is first gland the add it's part of the seminal plasma with significant differences between the dimensions of the adult and immature, the dimensions of ampulla of current study were lower those recoded in Gazella by Mohammed and Doohi (2017), in bull Hassan (2021) and in one humped camel (Mahmud et al, 2016).…”