Project 2726: E. Sferco, R. Herbst, G. Aguilera, J. Mirane, Z. Johanson. 2018. The rise of internal fertilization in the Anablepidae (Teleostei, Cyprinodontiformes): two new genera and species from the Miocene of Tucumán, Argentina. Papers in Palaeontology. 4 (2):177-195.
Specimen: Tucmanableps cionei (PVL/2412)
View: lateral view

Abstract

Two new genera and species of Cyprinodontiformes from the Miocene of Tucumán, Argentina, are described: Tucmanableps cionei and Sachajenynsia pacha. Both exhibit sexual dimorphism, indicated by the modification of the male anal fin into an intromittent organ; tricuspid teeth in the jaws; abdominal pelvic fins and other features that demonstrate a relationship with the family Anablepidae. Males of Sachajenynsia pacha gen. et sp. nov. present modifications of the anal fin, herein interpreted as an incipient gonopodium, whereas the anal fin of Tucmanableps cionei gen. et sp. nov. is modified into a complex gonopodium with a median distal plate, which is unique among the Anablepidae. In extant genera of the family, modification of the anal fin into an intromittent organ is related to internal fertilization; this condition is inferred for S. pacha but was clearly the reproductive mode of T. cionei. In our phylogenetic analysis, S. pacha is recovered as the sister group of all anablepids with evident internal fertilization, while T. cionei forms a clade with Anableps species. The occurrence of two new anablepid genera showing distinct and unique morphologies suggests that the fossil diversity of the Anablepidae may be higher than the extant one. Also, the new taxa were found in open lake deposits with coastal and inner lake sediments of the Río Salí Formation associated with the Miocene Entrerrian–Paranense Marine Ingression, supporting the idea that coastal environments and brackish waters are related to the generic diversification of the Anablepidae, as was suggested for the species of Jenynsia.


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Article DOI: 10.1002/spp2.1102

Project DOI: 10.7934/P2726, http://dx.doi.org/10.7934/P2726
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 3 Documents
  • 24 Taxa
  • 1 Specimen
  • 71 Characters
Total size of project's media files: 7 MB

Download Project SDD File
Total scored cells: 1626
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 71
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 160
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:66/5
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MorphoBank Project 2726


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Emilia Sferco
    Project Administrator
    Last logged in 01/04/18
    241171001626
    (1626, 0, 0)
    000
    Gastón Aguilera
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Juan Marcos Mirande
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M24731' (24 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
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    [1] Profundulus labialis
    Last Modified in 07/14/17
    2696900003
    [2] Alfaro cultratus
    Last Modified in 07/14/17
    4676700003
    [3] Aplocheilichthys spilauchen
    Last Modified in 07/14/17
    3696800003
    [4] Fluviphylax obscurum
    Last Modified in 07/14/17
    5666600003
    [5] Oxyzygonectes dovii
    Last Modified in 07/14/17
    2696900003
    [6] Anableps dowi
    Last Modified in 07/14/17
    0717100003
    [7] Anableps anableps
    Last Modified in 07/14/17
    0717100003
    [8] Anableps microlepis
    Last Modified in 07/14/17
    0717100003
    [9] Jenynsia unitaenia
    Last Modified in 07/14/17
    0737100003
    [10] Jenynsia weitzmani
    Last Modified in 07/14/17
    0727100003
    [11] Jenynsia onca
    Last Modified in 07/14/17
    0717100003
    [12] Jenynsia eirmostigma
    Last Modified in 07/14/17
    0737100003
    [13] Jenynsia eigenmanni
    Last Modified in 07/14/17
    1717000003
    [14] Jenynsia sanctaecatarinae
    Last Modified in 07/14/17
    1707000003
    [15] Jenynsia alternimaculata
    Last Modified in 07/14/17
    1727000003
    [16] Jenynsia obscura
    Last Modified in 07/14/17
    0717100003
    [17] Jenynsia multidentata
    Last Modified in 07/14/17
    0757100003
    [18] Jenynsia lineata
    Last Modified in 07/14/17
    0727100003
    [19] Jenynsia tucumana
    Last Modified in 07/14/17
    1707000003
    [20] Jenynsia diphyes
    Last Modified in 07/14/17
    0717100003
    [21] Jenynsia maculata
    Last Modified in 07/14/17
    1717000003
    [22] Jenynsia luxata
    Last Modified in 07/14/17
    1707000003
    [23] Tucmanableps cionei
    Last Modified in 07/14/17
    33393800003
    [24] Sachajenynsia pacha
    Last Modified in 07/14/17
    40323100003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views2499
    Media views531Media search (457 views); M451996 (74 views);
    Documents list185
    Project overview456
    Matrix views238Matrix landing page (206 views); Matrix Río Salí Fm. anablepids (32 views);
    Views for media list158
    Specimen list230
    Taxon list586
    Bibliography115




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project43
    Project downloads38
    Matrix downloads5Matrix Río Salí Fm. anablepids (5 downloads);