Morphological and histological characterization of sexual segment of the kidney in Notomabuya frenata (Cope, 1862) and Aspronema dorsivittatum (Cope, 1862) (Squamata, Mabuyidae)

NOVELLI, IARA A.; OLIVEIRA, PAOLA R. DE; CASTAÑON, MARIA CHRISTINA M.N.; SILVA, PILAR C.; SOUSA, BERNADETE M. DE

doi:10.1590/0001-3765201820170871

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Biological Sciences • An. Acad. Bras. Ciênc. 90 (2 suppl 1) • Aug 2018 • https://doi.org/10.1590/0001-3765201820170871 linkcopy

Morphological and histological characterization of sexual segment of the kidney in Notomabuya frenata (Cope, 1862) and Aspronema dorsivittatum (Cope, 1862) (Squamata, Mabuyidae)

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Abstract

The kidneys in two viviparous species of Neotropical lizards, Notomabuya frenata and Aspronema dorsivittatum (Mabuyidae), were investigated by light and scanning electron microscopy in order to determine the presence of the sexual segment of the kidney (SSK) and to study its morphology. The individuals used in this study belong to the Herpetological Collection of the Herpetology Laboratory - Reptiles of the Federal University of Juiz de Fora (CHUFJF-Reptiles) and they were collected between the years 2008 and 2012 from the Cerrado region in the state of Minas Gerais, Brazil. The SSK was present only in sexually mature males (with sperm in the testes / epididymis), whereas it was absent in sexually immature males. The nephron in both species consists of renal corpuscle, proximal convoluted tubule, distal convoluted tubule, collecting duct and sexual segment of the kidney. The SSK of the analyzed species were coated with a simple columnar epithelium, with high cells, basal nucleus and in the apical portion innumerable secretory granules. This study adds to the knowledge on reproductive biology and structures related to reproductive strategies of both lizard species and viviparous Neotropical lizards.

Key words
Accessory organ; reproduction; secretion granules; skinks; urogenital system

Species^*	Study Country	Reproductive Mode	Epithelium^**	Nucleus^***	Secretion^****	Hypertrophied Portion^*****	PAS	AB	Reference
LACERTILIA
Teiidae
Cnemidophorus lemniscatus (Linnaeus, 1758)	Venezuela	Oviparous	Columnar	Basal	Holocrine /Merocrine	CD	+	-	Del Conte and Tamayo 1973
Phrynosomatidae
Phrynosoma cornutum (Harlan, 1824)	NE	Oviparous	Columnar	Basal	N/A	DCT	N/A	N/A	Anderson 1960
Lacertidae
Podarcis tauricus (Pallas, 1814)	NE	Oviparous	Columnar	Basal	N/A	DCT/CD	N/A	N/A	Gabri 1983
Gekkonidae
Hemidactylus turcicus (Linnaeus, 1758)	EUA	Oviparous	Columnar	Basal	Merocrine	CD	+	+	Rheubert et al. 2011
Hemidactylus flaviviridis Rüppell, 1835	India	Oviparous	Columnar	Basal	Apocrine	CD	+	-	Sanyal and Prasad 1966
Tropiduridae
Tropidurus torquatus (Wied, 1820)	Brazil	Oviparous	Columnar	Basal	N/A	CD	-	N/A	Mendes et al. 2009
Scincidae
Scincella lateralis (Say, 1823) Mabuyidae	EUA	Oviparous	Columnar	Basal	Apocrine	DCT/CD	+	+	Sever and Hopkins 2005
Notomabuya frenata (Cope, 1862)	Brazil	Viviparous	Columnar	Basal	N/A	CD	-	-	present study
Aspronema dorsivittatum (Cope, 1862)	Brazil	Viviparous	Columnar	Basal	N/A	CD	-	-	present study
SERPENTES
Viperidae
Agkistrodon piscivorus (Lacépède, 1789)	EUA	Viviparous	Columnar	Basal	Apocrine / Merocrine	PCT	+	+	Sever et al. 2008
Acrochordidae
Acrochordus granulatus (Schneider, 1799)	Philippines	Viviparous	Columnar	Basal	N/A	DCT	-	-	Sever et al. 2012
Elapidae
Micrurus tener Baird & Girard, 1853	EUA	Oviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Naja samarensis Peters, 1861	Philippines	Oviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Aipysurus eydouxii (Gray, 1849)	Malaysia	Viviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Ephalophis greyae Smith, 1931	Australia	Viviparous	Columnar	Basal	N/A	DCT	-	-	Sever et al. 2012
Hydrophis lamberti Smith, 1917	Philippines	Viviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Hydrophis ornatus (Gray, 1842)	Malaysia	Viviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Hydrophis platurus (Linnaeus, 1766)	Costa Rica	Viviparous	Columnar	Median	Apocrine	DCT	+	-	Sever et al. 2012
Laticauda colubrina (Schneider, 1799)	Philippines	Oviparous	Columnar	Basal	N/A	DCT	+	-	Sever et al. 2012
Homalopsidae
Cerberus rynchops (Schneider, 1799)	Philippines	Viviparous	Columnar	Basal	N/A	DCT	+	+	Sever et al. 2012
Leptotyphlopidae
Rena dulcis Baird & Girard, 1853	EUA	Oviparous	Columnar	Basal	N/A	DCT/CD	+	-	Sever et al. 2012
Uropeltidae
Teretrurus sanguineus (Beddome, 1867)	India	Viviparous	Columnar	Basal	N/A	DCT	-	-	Sever et al. 2012
Colubridae
Sibynomorphus mikanii (Schlegel, 1837)	N/E	Oviparous	N/E	Basal	N/A	N/E	N/A	N/A	Rojas and Almeida-Santos 2008
AMPHISBAENIA
Amphisbaenidae
Amphisbaena vermicularis Wagler, 1824	Brazil	Oviparous	Columnar	Basal	N/A	CD	N/A	N/A	Valverde et al. 2005
Amphisbaena alba Linnaeus, 1758	Brazil	Oviparous	Columnar	Basal	N/A	CD	N/A	N/A	Valverde et al. 2005
Amphisbaena polystergum (Duméril, 1851)	Brazil	Oviparous	Columnar	Basal	N/A	CD	N/A	N/A	Valverde et al. 2005
		Oviparous

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[1] (NA) - not analyzed; (NE) - not specified; (CD) - collecting ducto; (DCT) - distal convoluted tubule; (PCT) - proximal convoluted tubule; (+) – PAS/AB positive; (-) – PAS/AB negative. ^*Taxonomic classification according to Pyron et al. 2013. ^**Epithelium lining the sexual segment of the kidney. ^***Position of the nucleus in the cell lining epithelium of the sexual segment of the kidney. ^****Figure secretion in epithelial cell lining of the sexual segment of the kidney. ^*****Hypertrophied portion of the kidney.