Heterorhabditis caligo n. sp. (Rhabditida: Heterorhabditidae): A New Entomopathogenic Nematode from Pichilemu Sand Dunes, Chile
Ernesto San-Blas, Patricia Morales-Montero, Brynelly Bastidas, Vladimir Půža, Ricardo A. R. Machado
TL;DR
Scientists discovered a new species of nematode, Heterorhabditis caligo, in Chile's coastal dunes, distinguishing it from similar species through physical and genetic traits.
Contribution
The paper introduces and describes Heterorhabditis caligo as a new species within the Heterorhabditidae family, based on morphological and molecular evidence.
Findings
Heterorhabditis caligo differs from H. marelatus in juvenile morphometrics like pharynx length and excretory pore position.
Males of H. caligo have shorter bursal papillae that do not reach the bursa's edge, unlike H. marelatus.
Phylogenetic analysis confirmed H. caligo as a distinct species within the megidis group.
Abstract
During a survey of the nematode biodiversity in the Petrel wetland (central Chile), a population of Heterorhabditis sp. was found in the coastal dune samples. Morphological, morphometric, and molecular studies indicated that this nematode belonged to the megidis group, and represented a novel species, which we named Heterorhabditis caligo n. sp. This nematode species resembles H. marelatus but it is different in the morphometrics of its infective juvenile in the following ways: pharynx length (135–150 μm vs. 120–138 μm), and the position of the excretory pore from the anterior end (105–128 μm vs. 81–113 μm). In males, the fourth and eighth pairs of the bursal papillae are shorter and do not reach the edge of the bursa in H. caligo n. sp., whereas all the papillae in H. marelatus reach the edge of the bursa. The excretory pore of amphimictic females of H. caligo n. sp. is located more…
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Taxonomy
TopicsEntomopathogenic Microorganisms in Pest Control · Nematode management and characterization studies · Insect symbiosis and bacterial influences