Monday, March 14, 2016

[Ichthyology • 2016] Amaralia oviraptor • A New Species of Amaralia Fowler (Siluriformes: Aspredinidae) from the Paraná-Paraguay River Basin

Amaralia oviraptor
 Friel & Carvalho, 2016


A new species of the banjo catfish genus Amaralia is described from the Paraná-Paraguay River Basin in central-western Brazil, Paraguay and northern Argentina. Amaralia oviraptor is distinguished from its single and allopatric congener, Amaralia hypsiura, by the greater number of dorsal-fin rays (3 vs. 2); by the absence of lateral contact between middle and posterior nuchal plates (vs. middle and posterior nuchal plates contacting each other laterally); and by a longer cleithral process (17.4–19.5 % of SL, mean 18.2 % vs. 14.0–17.2 % of SL, mean=15.5 %). Comments on the peculiar oophagic diet of Amaralia and an extended diagnosis of the genus are provided.

Keywords: Pisces, Neotropical, biodiversity, banjo catfish, osteology, oophagy

FIGURE 1. Amaralia oviraptor, MZUSP 4423, holotype, 68 mm SL
Brazil, Mato Grosso, Santo Antônio do Leverger municipality, rio Cuiabá.

Distribution. Amaralia oviraptor is widely distributed in the Paraná-Paraguay River system, found throughout the Paraguay River Basin in Brazil, Paraguay and northern Argentina and also in the Paraná drainage in Argentina and Brazil (Fig. 8). The new species seems to be absent in some portions of this system such as the Uruguay River Basin and the main tributaries of the upper Paraná.

Etymology. The epithet oviraptor is a combination of the Latin ovum (ovi), meaning egg; and raptor, a robber or plunderer, commonly used term for a predator, here referring to the peculiar dietary preferences observed in this species. Treated as a noun in apposition.

Ecological notes. An interesting aspect of Amaralia is its apparent dietary specialization on both the eggs and developing embryos of other catfishes (Friel, 1994; Roberts, 2015). Direct evidence of such oophagy is based on examination of the stomach contents from 23 preserved Amaralia specimens (17 A. hypsiura and six A. oviraptor ). Seven of these specimens (six female and one male) contained masses of ova or developing embryos in their stomach. The source of the eggs and embryos is most likely those of loricariid catfishes, and in least in one instance, the caudal fin-ray counts of the embryos fall within the range for loricariid catfishes. One male contained a single scoloplacid catfish specimen in its stomach, and the remaining 15 specimens (seven female and eight male) had empty stomachs. These observations differ significantly from the documented diets of other aspredinids, where stomach contents typically contained some organic detritus along with various aquatic and terrestrial insect prey.

John P. Friel and Tiago P. Carvalho. 2016. A New Species of Amaralia Fowler (Siluriformes: Aspredinidae) from the Paraná-Paraguay River Basin. Zootaxa. 4088(4) 

Uma nova espécie de Amaralia é descrita da bacia do Paraná-Paraguai no Centro-Oeste do Brasil, Paraguai e Norte da Argentina. Amaralia oviraptor difere-se do seu único congênere de distribuição alopátrica, Amaralia hypsiura, pelo maior número de raios da nadadeira dorsal (3 vs. 2); pela ausência de um contato lateral entre a placa nucal mediana e a placa nucal posterior (vs. placa mediana e posterior contatando uma a outra lateralmente); e por um processo cleitral mais longo (17.4–19.5 % do CP, média = 18.2 % vs. 14.0–17.2 % do CP, média = 15.5 %). Comentários sobre o gênero são feitos acerca de sua dieta oofágica e uma diagnose entre os aspredinídeos é fornecida. 
Palavras-chave: Neotropical, biodiversidade, bagre banjo, osteologia, oofagia.


  1. Nepal Base Camp Treks (P) Ltd (team guide) are not only provide you a perfect holiday tour services, also here to organize your trouble less trekking holidays in scenic green hills to icy peaks where reachable on foot.
    There are hundreds of best and fantastic trekking tour operators in Nepal, offer you to choose many popular trekking destinations in high Himalayas as, Everest Base Camp Trek, Everest Chola Pass Gokyo Lake trek, Everest Gokyo Renjo la Pass Trek, Annapurna Base Camp Trek, Annapurna Circuit Thorong La Pass Trek , Upper Mustang Trek,Annapurna Nar –Phu Hidden Valley Trek, Manaslu Circuit trek Kanchenjunga Base Camp Trek, Manaslu Circuit via Tsum Valley Trek, Langtang Valley Trek, Gosaikund Helambu Trek, Kathmandu Valley Circuit Trek and untouched tourist destinations of Ganesh Himal Camping Trek, Tawal Earthquake Area Camping Trek, Upper Dolpa Trek, Makalu Base Camp Trek and much more… as you desirable. Base Local Trekking Company in Nepal & get best deal power point trekking Agency in Nepal

  2. Annapurna Base Camp Trek assortment may be a known steady trekking route of seven days in Annapurna range region of Asian nation. Annapurna Base Camp trekking that additionally called Annapurna Sanctuary trekking is that the greatest distinguished trekking in Asian nation. the foremost peaks of western portion of large Annapurna Himal includes Hiunchuli, Annapurna south, Fang, Annapurna, Gangapurna, Annapurna three and Machhapuchchhre that ar organized in such a fashion that they exactly type a bend that have a diameter of virtually ten miles. Annapurna base camp trek of seven days from Kathmandu to Pokhara provides the nice influence of existence of a giant area within the core Modi Khola mark its resolution within the south of this ice mass vale in slender gorge of twelve,000ft deep. when you pass what is more to the south this gorge end up to be even wider and provides rise to the productive vale wherever Gurung folks live. Trekking in Asian nation Annapurna Base Camp higher and middle half Moody Khola offers trekkers some short cut trekking ways. Annapurna base camp trekking of seven days package begin its morning flight from Kathmandu to Pokhara and therefore the terribly day it goes on to Nayapul with personal vehicles and trek extend to Natural hot reserving in Jhinu danda, from wherever begins the Annapurna base camp or Annapurna Sanctuary Trek of the Asian nation Himalaya.

  3. Everest Base Camp Trek is one of those journeys that create your vacation dreams return true. Hiking on the legendary foothills just under the mighty Mount Everest 8848m with exciting views of the master peaks will solely be found within the Everest Region. This celebrated trek is thought worldwide for its trailblazing routes & the landscapes speak to your senses. On this trip you furthermore Mera peak out at the celebrated Kala Patthar (5,600m/18,373ft) read purpose for a few grand direct views of the very best mountain in the world. Everest Base CampTrek additionally includes different celebrated eight thousand peaks like Mt mountain peak (8,516m /27,940ft), Makalu (8,485m /27,838 ft) Cho-Oyu (8,201m /26,906ft). The culture of this specific space is of nice notebook stuff & interacting with the native of us puts a lot of zest into your venturesome journey as you walk through the Khumbu region of the Asian country. This legendary path could be a psychological thriller for top & wild hikers World Health Organization want the tread the methods wherever legends walked before on their thanks to conquering mountain peak, some did some didn’t however the Everest Base Camp Trek path keeps those legends alive for many trekkers World Health Organization head to the present region. The trip begins with a stirring mountain flight to Lukla, one among the world’s highest mountains; & as shortly as you set down at that altitude, the remainder is history. Your hike takes you to the favored village city of Namche, referred to as the ‘gateway to the Khumbu’’ & from there on you rehearse quiet monasteries with the acknowledge Sherpa of us World Health Organization inhabit this region & their culture is price noting. On the way, we have a tendency to visit the Sagarmatha parkland, home to some rare fauna & flora, this additionally wherever we have a tendency to adapt for a few time. We head deep into the Khumbu hiking into the forest of shrub, birch trees & pine, with colorful villages wherever we have a tendency to square measure sincerely welcome by the Sherpa community. we have a tendency to square measure pleasantly stunned to return across a hospital-based mostly in Khunde and health post at Pheriche that shows this region not solely cares for the locals however also are able to look out of trekkers World Health Organization have altitude issues. Doctors square measure invariably at the post for aid treatment. The Everest Base Camp Trek is arduous however varied teahouses square measure found on the paths providing smart grubbed to shelter from the generally harsh climate. Our trek culminates at base camp so we have a tendency to create a path for Namche as we have a tendency to hike back to Lukla to rendezvous for our flight to Katmandu. we have a tendency to add an additional contingency day for inclement weather which will delay flights. It’s recommended to be pretty acceptable to undertake this journey; you only want some smart hiking exercise before doing this trip. And Nepal Base Camp Treks can do the remainder to allow you AN action-packed odyssey of a period.