AnimaliaacceptedgenusAccepted

Henneguya

Thelohan, 1892

GBIF:210814193

0year

ABOUT

Descriptions(1)

Description. Morphological observations by light microscopic showed mature myxospores have ovoid shape from the valvular view, measuring 32.2 + / - 0.6 μm (31.6 - 32.8) in total length, 21.5 + / - 0.3 μm (21.2 - 21.8) in spore body length, 11.7 + / - 0.5 μm (11.2 - 12.2) in width and 10.6 + / - 0.9 μm (9.7 - 11.5) in thickness (Fig. 1 a, c). Non-bifurcate caudal appendage, measuring 10.7 + / - 0.4 μm (10.3 - 11.1) in length (Fig. 1 a, c). Two polar capsules elongated aubergine in shape, equal in size and measuring 4.9 + / - 0.2 μm (4.7 - 5.1) in length and 3.1 + / - 0.5 μm (2.6 - 3.6) in width (Fig. 1 b, c). Sporoplasm evidenced two nuclei in valvular view and sutural line was noticeable in side view (Fig. 1 b, c). Surface topography analyses of mature myxospores in valvular view revealed smooth valve cell with presence of mucous in a small area (Fig. 2 a). In sutural view myxospore evidence a conspicuous sutural line (Fig. 2 c). The density of caudal appendage is likely be identical to that of its valve (Fig. 2 b). Internal ultrastructural observations showed binucleated sporoplasm contained several sporoplasmosomes and valve-forming materials in young sporoblast developmental myxospore stage (Fig. 3 a). Polar capsule with polar tubule internalized and contained seven to eight coils at a more advanced sporoblast developmental stage (Fig. 3 b). Caudal appendage and conspicuous sutural line in mature spores. (Fig. 3 c). Histologic evidenced tissue tropism of the myxosporean under study, occurring in the stratus corneum of epidermis layer of the skin (Figure 4). The parasites induced no apparent tissue destruction, ulcerations, necrosis or inflammatory response. For molecular procedures, partial 18 S rDNA gene was successfully amplified by PCR (Fig. 5), however, sequencing failed.

Mathews, Patrick D., Mertins, Omar, Espinoza, Luis L., Aguiar, Julio C., Milanin, Tiago (2023): First report of a histozoic Henneguya (Cnidaria, Endocnidozoa) infecting a synbranchid potamodromous fish from South America: Morphostructural and biological data. Zoosystematics and Evolution 99 (2): 391-397, DOI: http://dx.doi.org/10.3897/zse.99.105770, URL: http://dx.doi.org/10.3897/zse.99.105770

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaCnidariaMyxosporeaBivalvulidaMyxobolidaeHenneguya

Henneguya

MULTIMEDIA

Media Files(5)

Figure 1. Henneguya sp. parasite from the skin of Synbranchus marmoratus. a: formalin-fixed myxospores in valvular view showing appendage caudal (large arrows) and two polar capsules in the anterior pole of spore occupied only the anterior third of the myxospore body (small blue arrows). b: mature myxospores stained with Giemsa with noticeable binucleate sporoplasm (double arrow) and polar capsules with aubergine shape (large arrow). c: schematic illustration of mature myxospore with polar tubule inside of polar capsule. Scale bars: 5 µm.