Macrogenioglottus alipioi
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publication ID |
https://doi.org/ 10.1016/j.jcz.2022.09.004 |
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persistent identifier |
https://treatment.plazi.org/id/03AA7508-FFAA-1D31-8801-DCC528CE0247 |
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treatment provided by |
Felipe |
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scientific name |
Macrogenioglottus alipioi |
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3.2. Protuberances in Macrogenioglottus alipioi View in CoL
Macroscopically, the examined specimen of this species has large protuberances in the postorbital-supratympanic region, without a clear distinction between the postorbital, temporal and parotoid ( Fig. 7A View Fig ). The dorsal region of the skin is mainly smooth ( Fig. 7A View Fig ).
Microscopically, the epidermal surface of the protuberance and dorsal skin is characterised by hexagonal cells, with a distinctive reticulation and defined boundaries ( Fig. 7B View Fig ). In addition, stoma-like glandular pores and spine-like projections are scattered on the surface ( Fig. 7B View Fig ; Tables 1 and 4). Spines are blunt, with 9.4 μm height and 20.3 μm width ( Table 1), and the cells that cover their surface have a smoother appearance than the rest of the epidermal cells ( Fig. 7B View Fig ). We observed that the epidermis is very thin and consists of only three cell layers, with a basal layer of cylindrical cells (stratum germinativum), a medial layer of polyhedral cells (stratum intermedium), and a thick layer of highly keratinized cells (stratum corneum) ( Fig. 7C View Fig ).
The dermis of the dorsal skin is different from the protuberances ( Fig. 7D–E View Fig ; Table 1). In the first region, the dermis is composed of a thin stratum spongiosum where the dermal glands are immersed in the abundant and disordered collagen fibres arrangement ( Fig. 7D View Fig ). Below this, is the EK layer ( Table 1) and a very thick stratum compactum with dense connective tissue constituted by collagen fibres distributed in an orderly manner and parallel to the outer surface ( Fig. 7D View Fig ). In the protuberance, the collagen fibres are arranged as in the dorsal skin, with the only difference that the stratum spongiosum is wider and the stratum compactum is thinner ( Fig. 7E View Fig ).
The alveolar glands (AGs) in the two studied regions are similar, having a large lumen surrounded by basophilic and acidophilic cylindrical cells with granular and spongy-like secretion rich in acidic and neutral glycoconjugates, lipids and proteins ( Fig. 7F View Fig ; Table 2).
Regarding syncytial glands (SGs) of the protuberances and the dorsal region, they only differ in size and arrangement of the secretory portions ( Tables 2 and 3). While SGs (i.e., OSGs) of the dorsal skin are small and scattered in the dermis ( Fig. 7D View Fig ), those in the protuberances are larger (LSGs) and partially packed in the dermis ( Fig. 7E View Fig ). Both types of SGs have a morphology similar to that described for most species of Odontophrynus ( Fig. 7B View Fig and 8 View Fig A-D; Tables 2–4). The secretory granules of LSGs and OSGs are positive for detection of both proteins and neutral glycoconjugates ( Fig. 8B–D View Fig ; Tables 2 and 3).
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