Gloria Arratia

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I am a student of evolution who studies advanced actinopterygian fishes through morphological, developmental, and molecular analyses. Among my interests are aspects concerning origin, relationships, and patterns of diversity of teleosts, which are the largest group of vertebrates. My current specific projects include the study of stem teleosts (writing the Handbook of Ichthyopaleontology: Teleostei, volumes 1-3)

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Andrei Dorian Soficaru

Institutul de Antropologie “Francisc J. Rainer”

Kristen J Gremillion

Ohio State University

Jose Ruben Guzman-Gutierrez

Universidad Humanista de las Americas

Armando Marques-Guedes

UNL - New University of Lisbon

James Kirkland

Utah Geological Survey

Thomas Holtz

University of Maryland

Robert Foley

University of Cambridge

Matteo Belvedere

Università degli Studi di Firenze (University of Florence)

José Luis Carballido

Museo Paleontológico Egidio Feruglio

Richard Cloutier

Université du Québec à Rimouski

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Fig. 10 in Otomorphs (= otocephalans or ostarioclupeomorphs) revisited

Fig. 10. Ontogenetic development of the caudal skeleton in alepocephaliforms. a. larva of Talisma... more Fig. 10. Ontogenetic development of the caudal skeleton in alepocephaliforms. a. larva of Talismania bifurcata of 28.18 mm standard length (KU:KUI 41395) illustrating a functional notochord and formation of neural and haemal arches and spines developing from caudad to rostrad direction; b. detail of the caudal skeleton of specimen illustrated in a; note the unusual extension of the haemal cartilage; c. larvae of 68 mm standard length; note the marked differences in the development of chordacentra; small arrows point to the haemal cartilage d. Searsia koefoedi; specimen of 126 mm standard length; note the development of the first uroneural or stegural-like element and the lack of chordacentra in front of hypurals 1 and 2. Photogra- ph courtesy of C. Quezada-Romegialli. cPU1 = preural chordacentrum 1; cU1, 4 = ural chordacentrum 1, 4 [polyural terminology; ural centrum 1, 2 of diural terminology]; E = epural; h1-6 = hypural 1-6; hd = hypural diastema; hsPU2, hsPU3, hsPU4 = haemal spin...

Fig. 2 in Otomorphs (= otocephalans or ostarioclupeomorphs) revisited

Fig. 2. Hypotheses of Otomorpha relationships according to molecular and morphological evidence (... more Fig. 2. Hypotheses of Otomorpha relationships according to molecular and morphological evidence (a) and only molecular evidence (b and c). a. after Lé et al., 1993; Lecointre, 1993; Lecointre, Nelson, 1996; Arratia 1996, 1997, 1999, 2010; Wiley, Johnson, 2010; b. after Lavoué et al., 2005, Lavoué et al., 2008; Poulsen et al., 2009; c. after Near et al., 2012; Betancur-R. et al., 2013; Betancur-R. et al., 2017.

Fig. 1. Clupeocephalan relationships proposed from 1973 in Otomorphs (= otocephalans or ostarioclupeomorphs) revisited

Fig. 1. Clupeocephalan relationships proposed from 1973 to 1994. a. after Rosen 1973, 1974; b. af... more Fig. 1. Clupeocephalan relationships proposed from 1973 to 1994. a. after Rosen 1973, 1974; b. after Rosen, 1982; c. after Fink, Weitzman, 1982; d. after Lauder, Liem, 1983; e. after Fink, 1984; f. after Rosen, 1985; g. after Begle, 1991, 1992; h. after Lecointre, Nelson, 1996. E = Euteleostei. Characters 1 = nuptial tubercles; 2 = stegural; 3 = adipose fin; 4 = absence of tooth plate over basibranchial 4; 5 = pleurostyle; 6 = fusion of hypural 2 with first ural centrum; 7 = fusion of extrascapulars and parietal bones; 8 = fusion of hemal arches and centra anterior to preural centrum 2. (Modified from Lecointre, Nelson, 1996: fig. 1).

A new suction feeder and miniature teleosteomorph, Marcopoloichthys mirigioliensis, from the lower Besano Formation (late Anisian) of Monte San Giorgio

Swiss journal of palaeontology, Jun 14, 2024

A new species (Marcopoloichthys mirigioliensis) of the stem teleosteomorph genus Marcopoloichthys... more A new species (Marcopoloichthys mirigioliensis) of the stem teleosteomorph genus Marcopoloichthys is described from the lower Besano Formation (late Anisian at Monte San Giorgio, southern Switzerland), making this new species distinct from Marcopoloichthys furreri from the Prosanto Formation (early Ladinian at Ducanfurgga, southeastern Switzerland). Marcopoloichthys mirigioliensis n. sp. is smaller (ca. 32 mm standard length) than M. furreri (ca. 40 mm standard length), and in addition, the two species have some important differences in the caudal endoskeleton and fin, e.g., number of epaxial and hypaxial basal fulcra, uroneural structure, size of hypurals, and presence versus absence of urodermals. Marcopoloichthys mirigioliensis n. sp. is the smallest member of Marcopoloichthyidae which is currently known from at least five species living in the Triassic of China (one species), Italy (two and others that remain undescribed), and Switzerland and according to current information, with its ca. 32 mm standard length is candidate to be considered a miniature fish. Additionally, this size makes it the smallest known stem teleost. As in other marcopoloichthyids, the buccal and suspensorium anatomy of M. mirigiolensis n. sp. corresponds to that of suction-feeder fishes.

Gloria Arratia

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