A Description of Arachnoscelis feroxnotha sp. nov. (Tettigoniidae: Listroscelidinae) from Southwest Costa Rica

Bowen-Jones, Evan

doi:10.2307/3503609

Cited by 5 publications

(3 citation statements)

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“…A number of species, including those dealt with in the present paper, were erroneously assigned to the genus Arachnoscelis [42] – [46] , mainly because of their shared general appearance, i.e. long and spiny legged and resembling spiders ( Fig.…”

Section: Systematics and Taxonomymentioning

confidence: 99%

Shrinking Wings for Ultrasonic Pitch Production: Hyperintense Ultra-Short-Wavelength Calls in a New Genus of Neotropical Katydids (Orthoptera: Tettigoniidae)

et al. 2014

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This article reports the discovery of a new genus and three species of predaceous katydid (Insecta: Orthoptera) from Colombia and Ecuador in which males produce the highest frequency ultrasonic calling songs so far recorded from an arthropod. Male katydids sing by rubbing their wings together to attract distant females. Their song frequencies usually range from audio (5 kHz) to low ultrasonic (30 kHz). However, males of Supersonus spp. call females at 115 kHz, 125 kHz, and 150 kHz. Exceeding the human hearing range (50 Hz–20 kHz) by an order of magnitude, these insects also emit their ultrasound at unusually elevated sound pressure levels (SPL). In all three species these calls exceed 110 dB SPL rms re 20 µPa (at 15 cm). Males of Supersonus spp. have unusually reduced forewings (<0.5 mm2). Only the right wing radiates appreciable sound, the left bears the file and does not show a particular resonance. In contrast to most katydids, males of Supersonus spp. position and move their wings during sound production so that the concave aspect of the right wing, underlain by the insect dorsum, forms a contained cavity with sharp resonance. The observed high SPL at extreme carrier frequencies can be explained by wing anatomy, a resonant cavity with a membrane, and cuticle deformation.

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Section: Systematics and Taxonomymentioning

confidence: 99%

Shrinking Wings for Ultrasonic Pitch Production: Hyperintense Ultra-Short-Wavelength Calls in a New Genus of Neotropical Katydids (Orthoptera: Tettigoniidae)

et al. 2014

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“…The peculiar spider-like anatomy has lead to taxonomists including other Neotropical similar spider-like katydids in Arachnoscelis. Four additional species from Central America (Bowen-Jones, 1994;Hebard, 1927; and two more from South America were described and assigned to Arachnoscelis. Montealegre-Z et al (2006) reported another spider-like species of katydid wrongly identified as Arachnoscelis sp.…”

Section: Introductionmentioning

confidence: 99%

“…Comparative anatomy of the male terminalia between Arachnoscelis and other related species: B redrawn from; C-E redrawn fromBowen-Jones (1994).…”

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confidence: 99%

The spider-like katydid <i>Arachnoscelis</i> (Orthoptera: Tettigoniidae: Listroscelidinae): anatomical study of the genus

Montealegre‐Z

Cadena-Castañeda²,

Chivers³

2013

Zootaxa

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This paper provides some observations on the anatomy of the neotropical katydid Arachnoscelis arachnoides Karny (Insecta: Orthoptera: Tettigoniidae). Arachnoscelis is a genus of predaceous katydids that comprise species that resemble spiders in their general body appearance. The type species, A. arachnoids, was described in 1891 from a single male collected in Colombia. Following the original description, these creatures were never found again, and were thought to have gone extinct or mistakenly assigned to the type locality. But between 1891 and 2012 four more species were described and incorrectly assigned to Arachnoscelis based on a similarity of body form. In this paper we present an anatomical comparaison of Arachnoscelis and its relatives, and propose that Arachnoscelis should be treated as a monotypic genus. This implies that other species previously described in Arachnoscelis, should be placed in different genera.

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The phallus in Tettigoniidae (Insecta: Orthoptera: Ensifera): <br />revision of morphology and terminology, and discussion on <br />its taxonomic importance and evolution

Chamorro-Rengifo

Lopes‐Andrade

2014

Zootaxa

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The phallus in Tettigoniidae (katydids) is a structure informative relative to the systematics of the group. Despite this, it is often not considered in descriptions of taxa. The lack of adequate descriptions of phalli is not only a gap for sytematic and morphological studies, but postpones works on the evolution of copula. Here we study the exoskeletal morphology of the phallus in katydids, its components, and revised the terminology for them. We carried out dissections for morphological comparisons, and complement the observational information with published data. We stained phalli of katydids with chlorazol black, to better contrast membranous versus sclerotized components. We demonstrate that phallic components vary at specific, generic and suprageneric levels, and that internal and external components vary in number, shape, size and position. Currently there is little comparative data to support hypotheses on the evolution of this structure, but possibly the possession of a titillator is an ancestral condition. We identify additional sclerotized components, the sclerites of the ventral fold of the dorsal lobe, which can modify the shape and function of the titillator, being also important for understanding the evolution of the phallus. Potential functional relationships based on hypothetical morphological correlations between the shape of titillator and cerci are proposed, categorized in three main groups: (i) phallus devoid of titillator and cerci simple, (ii) titillator with bifurcated or paired sclerites, and cerci adapted for grasping, and (iii) titillator with single process and/or sclerite and cerci simple, sometimes with a pointed tip. Two explanations for these hypothetical morphological correlations and morphological variation are proposed: first, species with similar structures at the postabdomen would share similar copulatory behaviour, and second, more than one selective pressure would have acted over the structures of the postabdomen.

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A Description of Arachnoscelis feroxnotha sp. nov. (Tettigoniidae: Listroscelidinae) from Southwest Costa Rica

Cited by 5 publications

References 0 publications

Shrinking Wings for Ultrasonic Pitch Production: Hyperintense Ultra-Short-Wavelength Calls in a New Genus of Neotropical Katydids (Orthoptera: Tettigoniidae)

Shrinking Wings for Ultrasonic Pitch Production: Hyperintense Ultra-Short-Wavelength Calls in a New Genus of Neotropical Katydids (Orthoptera: Tettigoniidae)

The spider-like katydid <i>Arachnoscelis</i> (Orthoptera: Tettigoniidae: Listroscelidinae): anatomical study of the genus

The phallus in Tettigoniidae (Insecta: Orthoptera: Ensifera): <br />revision of morphology and terminology, and discussion on <br />its taxonomic importance and evolution

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