Classical and molecular cytogenetics of Markiana nigripinnis (Pisces - Characiformes) from brazilian Pantanal: a comparative analysis with cytotaxonomic contributions

Monteiro, Ana Beatriz Goes Fernandes; Takagui, Fábio Hiroshi; Baldissera, Joana Neres da Cruz; Jerep, Fernando C.; Giuliano-Caetano, Lúcia

doi:10.1007/s11756-022-01091-x

Cited by 2 publications

(1 citation statement)

References 57 publications

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“…Similarly, the number and distribution of NORs in T. franciscoensis (Figure 2b) resembles that of T. chalceus (Portela et al, 1988) and T. argenteus (Miyazawa, 2015), following a common trend among characins (Medrado et al, 2008). In addition, the presence of GC-rich (CMA 3 + ) sites co-located with NORs are considered a basal trait for fish and amphibianli (Schmid, 1980;Tenório et al, 2013;Monteiro et al, 2022). On the other hand, the presence of additional GC-rich sites at centromeric regions (Figure 3) represent a unique and putatively apomorphic condition since AT-rich sites near centromeres are more frequently reported in small characins (Sánchez et al, 2021), thus indicating a heterogenous composition of satellite DNAs.…”

Section: Discussionmentioning

confidence: 73%

Cytogenetic analysis in Tetragonopterus franciscoensis (Characiformes): another piece to the karyoevolutionary puzzle of tetra fishes

Barros Fernandes,

De Araújo Bitencourt,

Calixto dos Santos

et al. 2023

Caryologia

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Tetragonopterus is a taxonomically complex genus in Characidae, being currently represented by nine species according to integrative approaches. One of them, T. franciscoensis was recently validated in rivers from northeastern Brazil. Even though molecular and morphological data have been collected in Tetragonopterus, the cytogenetic analyses in this group are scarce despite of the role of chromosomal variation in speciation. Herein, we present the first detailed karyotypic study in T. franciscoensis along with a comparative analysis with published cytogenetic data in characin fish. All specimens shared 2n=52 distributed in 12 metacentric (m), 12 submetacentric (sm), and 28 subtelocentric/acrocentric (st/a) chromosomes for both sexes as well as single nucleolus organizer regions on short arms of pair 8 and several GC-rich sites. The mapping of telomeric sequences (TTAGGG)n revealed no telomeric interstitial signals. While subtle cytogenetic differences were observed between samples from northeastern basins in Brazil, corroborating a recent genetic divergence, distinct karyotypes were detected in relation to congeneric taxa from other Brazilian regions. Therefore, the origin of large biarmed pairs in species with low 2n values should be related to occurrence of centric fusions.

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Section: Discussionmentioning

confidence: 73%

Cytogenetic analysis in Tetragonopterus franciscoensis (Characiformes): another piece to the karyoevolutionary puzzle of tetra fishes

Barros Fernandes,

De Araújo Bitencourt,

Calixto dos Santos

et al. 2023

Caryologia

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Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)

et al. 2023

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The early development of Markiana nigripinnis is described by morphological characters, pigmentation, and morphometry. Larvae were obtained through semi-natural breeding, collected, fixed, and identified according to their development. Eighty individuals with standard lengths ranging from 3.1 to 24.3 mm were analyzed. Larvae are poorly developed at hatching, with a relatively large yolk sac and finfold. At the preflexion stage, the eyes are pigmented, the mouth and anus are functional, the yolk is completely absorbed, and the pectoral fin bud emerges. At flexion, the first rays of the caudal, anal, and dorsal fins become evident. The pelvic fin bud emerges only at the postflexion stage, in addition to the complete absorption of the finfold. Pigmentation is distributed throughout the body, with a greater concentration on the top of the head, around the mouth, and at the base of the caudal fin. The myomere total number ranged from 34 to 49 (16–23 preanal, and 18–27 postanal). Juveniles show morphological characteristics like adults. The fins ray number are pectoral: 11–13, pelvic: 5–7, dorsal: 8–11, caudal: 16–27, and anal 30–47. The morphometric relationships reveal variations in growth along the early ontogeny of the species.

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Classical and molecular cytogenetics of Markiana nigripinnis (Pisces - Characiformes) from brazilian Pantanal: a comparative analysis with cytotaxonomic contributions

Cited by 2 publications

References 57 publications

Cytogenetic analysis in Tetragonopterus franciscoensis (Characiformes): another piece to the karyoevolutionary puzzle of tetra fishes

Cytogenetic analysis in Tetragonopterus franciscoensis (Characiformes): another piece to the karyoevolutionary puzzle of tetra fishes

Early ontogeny of tetra Markiana nigripinnis (Characiformes: Characidae)

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