Brazilian Miocene crabs I. Taxonomic review of Cyclocancer tuberculatus Beurlen, 1958 and Hepatella amazonica Beurlen, 1958 (Pancrustacea, Decapoda, Brachyura)

In describing Cyclocancer to accommodate his new species C. tuberculatus, Beurlen highlighted that his new genus was a cancroid intermediate in form between Atelecyclus and Cancer, but with enough characters to be placed in a new genus. Examination of C. tuberculatus type material revealed that Cyclocancer is a junior synonym of Hepatus. Therefore, C. tuberculatus is herein transferred into Hepatus as H. beurleni nomen novum because H. tuberculatus (Beurlen, 1958) is a junior homonym of H. tuberculatus Saussure (1858), a junior synonym of Hepatus pudibundus (Herbst, 1785). Miohepatus gen. nov., comb. nov. is proposed here to accommodate Hepatella amazonica Beurlen from the Pirabas Formation, Neogene, Pará, Brazil, based on new morphological evidence from the type material

REGISTRO DE OCORRÊNCIA DO Hoplosternum littorale (HANCOCK, 1828) (SILURIFORMES: CALLICHTHYIDAE) NA BACIA DO RIO SALGADO NO SUL DO CEARÁ-BRASIL

The current paper had as objective to record the occurrence of H. littorale in the Salgado River basin, Juazeiro do Norte municipality, in the southern region of Ceará, based on the collection of 12 specimens, made with the use of appropriate tools with a thickness of 0.5 cm, the fishes were captured on the Carás River and the São José River, effluents of the Salgado River. With larger sizes and weights, the fishes collected in São José River seem to have adapted to the pollution, since the river receives sanitary sewage from the surrounding neighborhoods and in the dry season is its only source of water. The Carás River does not have sanitary sewage, but its banks have been deforested with several silted places. By demonstrating an ease of adjusting better to a polluted environment and with low oxygen content, the species characterizes an invasive profile.Keywords: Biodiversity; Ichthyofauna; Semi-arid; Tamoatá.O presente trabalho teve como objetivo registrar a ocorrência do H. littorale na bacia do rio Salgado na região Sul do Ceará, município de Juazeiro do Norte, baseado na coleta de 12 espécimes, feita com a utilização de tarrafas com malha de espessura 0,5 cm, foram capturados no rio Carás e no riacho São José, afluentes do rio Salgado. Com tamanhos e pesos maiores, os peixes coletados no riacho São José, parecem ter se adaptado à poluição, visto que o riacho recebe esgotos sanitários dos bairros circunvizinhos e no período de estiagem é sua única fonte de água. Já o rio Carás não apresenta esgotos sanitários, porem tem suas margens desmatadas com vários locais assoreados. Por demostrar uma facilidade de se ajustar melhor a um ambiente poluído e com pouco teor de oxigênio, a espécie caracteriza um perfil de invasora.Palavras-chave: Biodiversidade, Ictiofauna, Semiárido, Tamoatá

Validation of Chronocancer camilosantanai† Santana, Tavares, Martins, Melo & Pinheiro (Crustacea, Decapoda, Brachyura) from the Romualdo Formation, Araripe Sedimentary Basin, Brazil

Santana et al. (2022) described a new genus and species of fossil crab, Chronocancer camilosantanai, from carbonate concretions of the Romualdo Formation of the Araripe Sedimentary Basin. The journal in which the description appeared was published online only and the new name did not include a ZooBank registration number (LSID), as required for validation of new names in electronic-only publications. The present note serves to validate the name Chronocancer camilosantanai by fulfilling the ICZN conditions for nomenclatural availability. The date and authorship of the specific name, accordingly, are those of this note, not Santana et al. (2022)

OCORRÊNCIA DOS CAMARÕES Macrobrachium amazonicum (HELLER, 1862) E Macrobrachium jelskii (MIERS, 1877)

Os camarões Macrobrachium amazonicum e Macrobrachium jelskii são espécies essencialmente dulcícolas, distribuídos nas regiões tropicais e subtropicais da América do Sul. O objetivo do estudo foi registrar a presença dessas espécies no Rio Cariús na bacia do Alto Jaguaribe, no município de Farias Brito, na região semiárida do sul no estado do Ceará, Brasil. As coletas foram realizadas de junho de 2013 a janeiro de 2014. Os espécimes foram transportados e depositados na coleção carcinológica (0004 e 0005) do Laboratório de Crustáceos do Semiárido da Universidade Regional do Cariri e na Coleção Carcinológica do Museu de Zoologia da USP (MZUSP 32647 e MZUSP 32646).

Caracterização genética e biométrica das populações de camarão rosa Farfantepenaeus brasiliensis de três localidades da costa do Rio Grande do Norte

Shrimp catch is one of the main fishing activities in the world, mostly for the high value of commercialization reached by shrimp meat. Biological characteristics of penaeids make this group of shrimps aspirant to show different levels of population structure. Penaeid species like Farfantepenaeus brasiliensis are dependent of the estuary to complete its life cycle. Thus, the aim of this work was to evaluate if populations of F. brasiliensis, from the coast of Rio Grande do Norte, are structured by morphometrical and molecular analysis. Several measurements (Lt, Lc, La and weight) were recorded for each specimen. Divergence between places has been evaluated by univariate (ANOVA) and multivaried (Discriminant Analysis) techniques. FSTAT and GENEPOP were used to get the molecular levels of genetic variability in each population, as well as, comparisons between populations. The frequentist and bayesian methods were used to detect migrants in GENECLASS software. The results of the 3 morphometric analysis pointed out differences between sex-ratio in all analyzed localities. These results probably are related with differences in growth rate between sex and/or spatial stratification. Significant morphometric differences were obtained between populations by the univariate and multivaried methods. These differences could be consequence of the estuary necessity to complete the life cycle in F. brasiliensis. Likewise, local differences could contribute for these results. Females were more divergent among different areas than males. This result also could be a reflex of the biological characteristics of this species, due to the great relation between the spawning places and the females. The interval between insemination and spawning in shrimp females can be of 10 to 20 days. The molecular results showed medium levels of genetic variability in the analyzed localities. When compared with other species from the same family Ho varied between 0,471 and 0,540. The FST values did not showed genetic structure. However, these results could reflect the low number of analyzed loci, or the predominance of females in the samples, a characteristic inherent of the penaeids. The procedure used to detect migrants did not support the existence of migrants among evaluated populations; however some individuals had been excluded from all populations, probably belonging to other populations not sampled. In such a way, the set of results obtained, plus the biological characteristics of this species, and the distinct environmental characteristics among areas allow us to infer an existence of at least two F. brasiliensis stocks in Rio Grande do Norte coast.Universidade Federal de Sao CarlosA captura de camarões é uma das atividades pesqueiras de maior importância no mundo, principalmente pelo alto valor de comercialização alcançado por sua carne. Características biológicas dos peneídos fazem deste grupo de camarões candidatos a apresentarem algum grau de estruturação populacional, já que espécies como Farfantepenaeus brasiliensis apresentam certa dependência da presença de estuários para completarem seu ciclo de vida. Desta forma, o objetivo deste trabalho foi avaliar como estão estruturadas as populações de F. brasiliensis na costa do Estado do Rio Grande do Norte por meio de análises morfométricas e moleculares. Para tanto, mensurações (Ct, Cc, Ca e peso) foram obtidas de cada exemplar analisado. Diferencças entre locais foram avaliadas por meio de técnicas univariadas (ANOVA) e multivariadas (Análise discriminante). Os programas FSTAT e GENEPOP foram utilizadados para se obter os níveis de variabilidade genética das populações, bem como, as comparações moleculares entre populações. Para detecção de migrantes os métodos frequentista e bayesiano do software GENECLASS foram adotados. Os resultados das análises morfométricas apontam diferenças nas proporções dos sexos em cada localidade analisada, que podem ser relacionadas a diferenças nas taxas de crescimento entre sexos e/ou estratificação espacial diferencial. Diferenças morfométricas significativas entre os locais foram evidentes tanto por técnicas univariadas como multivariadas. Estas diferenças podem ser resultados da necessidade dos estuários para completar o ciclo de vida por esta espécie, bem como, em virtude das diferenças exitentes entre os estuários presentes nas localidades analisadas. Fêmeas se mostraram mais diferenciadas entre locais que machos. Este resultado também pode ser reflexo de características biológicas da espécie, haja vista que o local de desova guarda grande relação com as fêmeas desta espécie que da inseminação a desova podem levar 2 de 10 a 20 dias. Os resultados moleculares mostraram níveis medianos de variabilidade genética nos locais analisadas, Ho variando entre 0,471 0,540, quando comparadas a outras espécies da mesma família. Os valores de FST obtidos não evidenciaram estruturação genética, no entanto, estes resultados podem ser tanto reflexo do baixo número de locos analisados, como da característica dos peneídeos de um predomíneo de fêmeas nas amostras. O procedimento utilizado para a detecção de migrantes não evidenciou a existência destes entre as populações avaliadas, no entanto, foram identificados indivíduos que foram excluídos de todas as populações podendo pertencer a outras populações não amostradas. Desta forma, o conjunto de resultados obtidos, somados as características biológicas da espécie, e as características ambientais distintas entre locais, nos permitem inferir a existência de pelo menos dois estoques de F. brasiliensis na costa do Rio Grande do Norte

In silico analysis of polymorphic microsatellites in penaeid shrimp and construction of a free-access database

We performed an in silico analysis of all microsatellites so far described for penaeid shrimp and for which the polymorphic behavior has previously been analyzed. The objective of the study was to evaluate the structural characteristics of these microsatellites and identifying patterns which allow the characterization of the nature of these sequences in the penaeid genome. All data were compiled in a free-access database specially constructed for this study. Three hundred non-mononucleotide polymorphic microsatellite loci described for 12 shrimp species belonging to the family Penaeidae were analyzed and simple and compound microsatellites with di-, tri-, tetra-, penta- and hexanucleotide motifs were found. Dinucleotides and trinucleotides were the most frequent motifs among both the simple and the compound microsatellites. Although a certain bias related to different microsatellite isolation methodology could not be discarded, it is possible that part of this microsatellite abundance reflects some degree of conservation of microsatellite motifs among the different species. There was a pronounced motif variability within and between species, indicating high differentiation dynamism of these repetitions in this animal group. This study not only sheds light on the structure of the microsatellites present in the penaeid shrimp genome but also resulted in the free-access Penaeid Shrimp Microsatellite Database (available at http://www.shrimp.ufscar.br) which may be very useful for optimizing the use of these microsatellites

New findings on Dendrobranchiata fossils of the Romualdo Formation, Araripe Basin, Northeast of Brazil

Alencar, Damares Ribeiro, Oliveira, Gustavo Ribeiro De, Pinheiro, Allysson Pontes, Saraiva, Antônio Álamo Feitosa (2020): New findings on Dendrobranchiata fossils of the Romualdo Formation, Araripe Basin, Northeast of Brazil. Zootaxa 4731 (1): 63-74, DOI: https://doi.org/10.11646/zootaxa.4731.1.

New Cretaceous (Aptian/Albian) boxer shrimp (Crustacea, Decapoda, Stenopodidea) from the Araripe Sedimentary Basin, NE, Brazil.

Stenopodidean shrimps are mostly cryptic in their habitats and are typically related with coral rubble or dead coral heads, rocks and crevices, and in association with other marine invertebrate such as sponges, crinoids and corals. Here, we describe a new stenopodidean shrimp, Dubiostenopus parvus n. gen. n. sp., from the Romualdo Formation (Aptian/Albian), Araripe Sedimentary Basin. The specimen studied here was collected in the municipality of Trindade, Pernambuco State, Brazil. The specimen is the imprint of a small shrimp approximately 10 mm in length, with a robust cephalothorax, a well-developed cheliped in the third pereiopod, and a second pleura not overlapping the first. This is the first stenopodidean shrimp described from the Romualdo Formation and the first described from South America. Comparisons with other Brazilian shrimp-like fossils are made, as well as comparisons with all other fossil stenopodideans