Complex abnormality combinations between the scleritome and the sclerites of Chiton articulatus (Mollusca: Polyplacophora): New findings for the teratological classification

Avila-Poveda, Omar Hernando; Ramirez-Santana, Brenda Paola; Martinez-Diaz, Pedro; Ramírez‐Pérez, Jorge Saúl; Saavedra‐Sotelo, Nancy C.; Vargas-Trejo, Bibiana; Amezcua-Gomez, Carlos Alberto; Melendez-Galicia, Carlos

doi:10.1016/j.jcz.2019.01.003

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…This instance concerns the polyplacophoran Chiton articulatus Sowerby, 1832. In several specimens, aberrations of the dorsal shell plates have been found that at first sight resemble segmental aberrations as described for annelids and arthropods (Avila-Poveda et al, 2019). These concern asymmetries in fusion und fission and plates that are covering only one body half.…”

Section: Helicomery In Other Taxa With Serial Structures Along the Anteroposterior Body Axismentioning

confidence: 76%

“…(a) The mollusk Chiton articulatus Sowerby, 1832 ventral view of shell plates, shell Plate 6 has additional silts on the animal's left side, Plate 7 is reduced at the left side and Plate 8 is slightly larger on the animal's right side. This may indicate a spiral, but the serial structures on the ventral side of the soft parts of the body have to be studied (after Avila‐Poveda et al, 2019, with permission from Elsevier). (b,b′) The vertebrae of the newt Triturus dobrogicus (Kiritzescu, 1903) the malformed specimen B shows oblique vertebrae boundaries and a left, right alternating number of ribs indicating a spiral pattern, (b′) A normally developed specimen of the same species (after Buckley et al, 2013).…”

Section: Helicomery In Other Taxa With Serial Structures Along the Anteroposterior Body Axismentioning

confidence: 99%

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Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

Scholtz

2021

Journal of Morphology

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This review deals with helicomery, that is, the specific malformation of a spiral arrangement of segments and other serial structures. Helicomery was first described in annelid and arthropod body segments. However, corresponding patterns occur in arthropod appendages and other bilaterians with serially arranged body parts, such as tapeworms, nematodes, vertebrates, and probably chitons. The specifics of the spirals such as length, orientation, and handedness are described. Most spirals are dorsal and comprise only a few loops. Helicomery is formed by a shift of cells during development or in adults caused by changes in cell adhesion or mechanical impacts such as lesions. A model for the formation of helicomery is proposed, which is based on medieval church labyrinths. These complex spiral structures are derived from concentric lines by the shift of relatively few tiles. This principle of “small causes, great effect” also applies to “spiral segments,” because helicomery dissolves segmental patterns and questions the concept of segments as distinct structures. The widespread occurrence of helicomery in nonhomologous serial structures might indirectly indicate an underlying principle of seriality among Bilateria.

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Section: Helicomery In Other Taxa With Serial Structures Along the Anteroposterior Body Axismentioning

confidence: 76%

Section: Helicomery In Other Taxa With Serial Structures Along the Anteroposterior Body Axismentioning

confidence: 99%

Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

Scholtz

2021

Journal of Morphology

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“…Following the measures registered by Keen (1971), juveniles and adults were recognized. The algae epibionts observed were recorded from each valve present in the chitons (I to VIII) according to Ávila-Poveda et al (2019). The epibiont algae identification was done following the protocol by Quiroz-González et al (2020).…”

Section: Methodsmentioning

confidence: 99%

Algal epibiont species on Chiton articulatus (Mollusca: Polyplacophora) from a rocky intertidal coast from the Mexican Tropical Pacific

et al. 2022

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Chiton articulatus, a mollusk endemic to the Mexican Pacific, is a species whose ecological associations with the algae that colonize it are not well known. This work describes the epibionts observed on the shells of this species. We collected chitons in the rocky intertidal of 2 localities in the state of Guerrero, Mexico. Sixty-two chitons were collected that had 50 species of algae. The best represented family was Cladophoraceae with 10 species. Of the total number of specimens, 26 had epibionts whose distribution on the shell was different: 11 species on the valves, 17 on the suture, 1 on the belt, and 22 species shared in the first 2 zones. Five morphofunctional groups of algae were recognized: microscopic, filamentous, crustose, foliose and corticated filaments, with a predominance of filaments. A relationship was found between the size of the chitons and the percentage of algal cover. Studies like the present one are important due to the interaction between both organisms, since chitons offer surfaces of easy colonization for algae. Furthermore, records of species that do not commonly appear in floristic inventories can be found on these.

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Chitons

Hagen¹

2021

Invertebrate Medicine

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Complex abnormality combinations between the scleritome and the sclerites of Chiton articulatus (Mollusca: Polyplacophora): New findings for the teratological classification

Cited by 4 publications

References 20 publications

Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

Screwed up: Spirality of segments and other iterated structures suggest an underlying principle of seriality in bilaterians

Algal epibiont species on Chiton articulatus (Mollusca: Polyplacophora) from a rocky intertidal coast from the Mexican Tropical Pacific

Chitons

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