A new species of whiptail armored catfish, genus Pseudohemiodon (Siluriformes: Loricariidae) from the Orinoco River basin, Llanos region of Colombia and Venezuela

Rojas-Molina, Yecid; Provenzano-Rizzi, Francisco; Ramírez‐Gil, Hernando

doi:10.1590/1982-0224-20180160

Cited by 1,161 publications

(2 citation statements)

References 8 publications

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“…In tripodfishes, the extremely long caudal fin ventral PPRs that match pelvic fin ray length enable a posture parallel to the substrate 53 . Altered POC modules may also drive the remarkable extension of the peripheral‐most principal caudal fin rays of some whiptail catfishes (Loricariinae) 54‐57 . Co‐characterizing caudal fin ray ontogeny, morphologies, and muscle attachments in these groups would help elucidate if and how changes to vPOC/vPPR modules cause caudal fin symmetry‐breaking and ray elongation phenotypes.…”

Section: Discussionmentioning

confidence: 99%

Coordinated patterning of zebrafish caudal fin symmetry by a central and two peripheral organizers

Desvignes

Robbins

Carey

et al. 2022

Developmental Dynamics

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Background: Caudal fin symmetry characterizes teleosts and likely contributes to their evolutionary success. However, the coordinated development and patterning of skeletal elements establishing external symmetry remains incompletely understood. We explore the spatiotemporal emergence of caudal skeletal elements in zebrafish to consider evolutionary and developmental origins of caudal fin symmetry. Results: Transgenic reporters and skeletal staining reveal that the hypural diastema-defining gap between hypurals 2 and 3 forms early and separates progenitors of two plates of connective tissue. Two sets of central principal rays (CPRs) synchronously, sequentially, and symmetrically emerge around the diastema. The two dorsal-and ventral-most rays (peripheral principal rays, PPRs) arise independently and earlier than adjacent CPRs. Muscle and tendon markers reveal that different muscles attach to CPR and PPR sets. Conclusions: We propose that caudal fin symmetry originates from a central organizer that establishes the hypural diastema and bidirectionally patterns surrounding tissue into two plates of connective tissue and two mirrored sets of CPRs. Further, two peripheral organizers unidirectionally specify PPRs, forming a symmetric "composite" fin derived from three fields. Distinct CPR and PPR ontogenies may represent developmental modules conferring ray identities, muscle connections, and biomechanical properties. Our model contextualizes mechanistic studies of teleost fin morphological variation.

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Section: Discussionmentioning

confidence: 99%

Coordinated patterning of zebrafish caudal fin symmetry by a central and two peripheral organizers

Desvignes

Robbins

Carey

et al. 2022

Developmental Dynamics

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“…Buccal ornamentation is an important character to allocate the species of Pseudohemiodon group (Provenzano-Rizzi & Barriga- Salazar, 2020;Rojas-Molina et al, 2019), and thus the authors designate the characteristics of lower lip of the new species described here (Figure 1a) comparing it to Rhadinoloricaria species (Figure 1b).…”

Section: Morphological Analysismentioning

confidence: 99%

A new species of mailed catfish of genus Rhadinoloricaria (Siluriformes: Loricariidae: Loricariinae) from Rio Negro basin, Brazil

Crispim‐Rodrigues,

Bernt,

Waltz

et al. 2023

Journal of Fish Biology

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During a recent collection expedition to the Rio Negro, in the state of Amazonas, Brazil, eight individuals of an unknown species were collected, with a combination of characteristics that placed the species in the genus Rhadinoloricaria. Furthermore, the presence of two autapomorphic characteristics, including numerous elongated papillae on the lower lip and unbranched barbelets on the margin of lower lip, suggests that it is a new species. From morphological and phylogenetic analyses, including the sequencing of specific genes to calculate the maximum likelihood analyses, coupled with osteological computed tomography (CT) scan analyses, the authors corroborated that the specimens represent a new species of Rhadinoloricaria, described in the present study.

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The genus Pseudohemiodon (Siluriformes, Loricariidae) in Ecuador, with the description of a new species

Provenzano-Rizzi

Argüello

Barriga-Salazar

2022

Zootaxa

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At the Fish Collection of the Museo de la Escuela Politecnica Nacional (MEPN), Quito, the specimens of the genus Pseudohemiodon were revised and three species were identified. The three species inhabit the Amazon versant of Ecuador. Chronologically the species are: P. lamina (Günther 1868) originally described from Xeberos (Jeberos), Peru; P. apithanos Isbrücker & Nijssen 1978, originally described from the Conejo River, Putumayo River system, Ecuador, and a new species described herein. The new species was caught in the Aguarico River, Napo River system, and is represented by two small sized specimens. It is distinguished from all congeners by the combination of the following characters: abdomen totally covered with small to medium-sized, irregularly shaped plates; absence of small plates, anterior to gill openings; eyes relatively small, and six to seven dark transverse bands, posterior to the dorsal-fin. Isbrücker & Nijssen (1978) indicate the presence of P. laticeps (Regan 1904) in Ecuador; however we didn’t find any specimen of this species. The specimens that could potentially be identified as P. laticeps are large sized specimens of P. apithanos. Some external morphological characters, morphometric and meristic data of analyzed specimens of P. apithanos and P. lamina are provided.

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A new species of whiptail armored catfish, genus Pseudohemiodon (Siluriformes: Loricariidae) from the Orinoco River basin, Llanos region of Colombia and Venezuela

Cited by 1,161 publications

References 8 publications

Coordinated patterning of zebrafish caudal fin symmetry by a central and two peripheral organizers

Coordinated patterning of zebrafish caudal fin symmetry by a central and two peripheral organizers

A new species of mailed catfish of genus Rhadinoloricaria (Siluriformes: Loricariidae: Loricariinae) from Rio Negro basin, Brazil

The genus Pseudohemiodon (Siluriformes, Loricariidae) in Ecuador, with the description of a new species

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