Displaying publications 101 - 120 of 138 in total

Abstract:
Sort:
  1. The first species of Siamites Franz (Coleoptera, Staphylinidae, Scydmaeninae) in East Malaysia
    JaŁoszyŃski P
    Zootaxa, 2019 Jan 17;4545(3):447-450.
    PMID: 30790914 DOI: 10.11646/zootaxa.4545.3.11
    The glandulariine genus Siamites is amongst the rarest Oriental ant-like stone beetles. To date, only three species have been known, distributed in Thailand and Vietnam. A new species, S. sarawakensis sp. n. is described here, based on a male specimen collected in Sarawak, East Malaysia. This finding extends the known range of Siamites over 1200 km southeastward.
    Matched MeSH terms: Animal Structures
  2. A new species of Angaeus from Malaysia with possible affinity to related genera within Stephanopinae (Araneae: Thomisidae)
    Benjamin SP
    Zootaxa, 2017 Oct 17;4337(2):297-300.
    PMID: 29242447 DOI: 10.11646/zootaxa.4337.2.10
    The crab spider genus Angaeus Thorell, 1881 currently contains 10 described species (Benjamin 2013; WSC 2017). All species of the genus are restricted to tropical Asia. The aim of this correspondence is to illustrate and describe a new species of the genus characterized by a number of features previously found in the genera Angaeus, Borboropactus Simon, 1884, Epidius Thorell, 1877 and Geraesta Simon, 1889. The most unusual feature is the elongated tibia of the male palp that was previously thought to be diagnostic of Epidius (Figs 1, 2, 8; character 1 in Benjamin 2011; Benjamin 2017). However, the new species lacks tibial macrosetae (Figs 1, 2, 8) and lacks a flexibly attached MA, both also being characteristics of Epidius (characters 2 and 18 in Benjamin 2011). Furthermore, this new species differs considerably in general appearance from all known species of Epidius.
    Matched MeSH terms: Animal Structures
  3. Review of the genus Anipocregyes Breuning, 1939 with two new species from Borneo (Coleoptera, Cerambycidae, Lamiinae, Mesosini)
    Yamasako J, Makihara H
    Zootaxa, 2017 Apr 07;4250(5):461-474.
    PMID: 28610002 DOI: 10.11646/zootaxa.4250.5.4
    The genus Anipocregyes Breuning, 1939 is reviewed. Cristipocregyes rondoni Breuning, 1965, Metipocregyes rondoni Breuning, 1965, and Mesosa (Perimesosa) seminivea Breuning, 1965 are transferred to the genus Anipocregyes, and Setomesosa rondoni Breuning, 1968 is synonymized with A. seminivea comb. nov. As a result, two genera, Cristipocregyes Breuning, 1965 and Setomesosa Breuning, 1968, are synonymized with Anipocregyes. Metipocregyes rondoni Breuning, 1965 becomes a secondary homonym and Anipocregyes albifrons nom. nov. is proposed as a replacement name. Anipocregyes kawakamii sp. nov. and A. wakabayashii sp. nov. are described from Borneo. All the seven known species of Anipocregyes are illustrated with their male genitalia (except for A. laosensis) and a key to the species is provided.
    Matched MeSH terms: Animal Structures
  4. A new species of Cyrtodactylus (Squamata: Gekkonidae) and the first record of C. otai from Son La Province, Vietnam
    Nguyen TQ, Pham AV, Ziegler T, Ngo HT, LE MD
    Zootaxa, 2017 Oct 30;4341(1):25-40.
    PMID: 29245698 DOI: 10.11646/zootaxa.4341.1.2
    We describe a new species of Cyrtodactylus on the basis of four specimens collected from the limestone karst forest of Phu Yen District, Son La Province, Vietnam. Cyrtodactylus sonlaensis sp. nov. is distinguished from the remaining Indochinese bent-toed geckos by a combination of the following characters: maximum SVL of 83.2 mm; dorsal tubercles in 13-15 irregular rows; ventral scales in 34-42 rows; ventrolateral folds prominent without interspersed tubercles; enlarged femoral scales 15-17 on each thigh; femoral pores 14-15 on each thigh in males, absent in females; precloacal pores 8, in a continuous row in males, absent in females; postcloacal tubercles 2 or 3; lamellae under toe IV 18-21; dorsal head with dark brown markings, in oval and arched shapes; nuchal loop discontinuous; dorsum with five brown bands between limb insertions, third and fourth bands discontinuous; subcaudal scales distinctly enlarged. In phylogenetic analyses, the new species is nested in a clade consisting of C. huongsonensis and C. soni from northern Vietnam and C. cf. pulchellus from Malaysia based on maximum likelihood and Bayesian analyses. In addition, we record Cyrtodactylus otai Nguyen, Le, Pham, Ngo, Hoang, Pham & Ziegler for the first time from Son La Province based on specimens collected from Van Ho District.
    Matched MeSH terms: Animal Structures
  5. Organothrips stongensis sp. n. and Watanabeothrips yasuakii Okajima: new records from Peninsular Malaysia of Thysanoptera: Thripidae
    Ng YF
    Zootaxa, 2017 Oct 31;4341(2):283-286.
    PMID: 29245693 DOI: 10.11646/zootaxa.4341.2.10
    Organothrips stongensis sp. n. is described from Malaysia based on two males. These are sharply bicolored in contrast to other males in this genus, and a key is provided to males of the four known species of this genus. Organothrips was not previously known in Malaysia. Watanabeothrips yasuakii Okajima is also a first record from Malaysia, and differences between these females and the holotype decription are discussed.
    Matched MeSH terms: Animal Structures
  6. Drepanosticta rahmani sp. nov., from Kedah, Malaysia (Odonata: Zygoptera: Platystictidae)
    Dow RA, Choong CY, Ng YF
    Zootaxa, 2017 Oct 24;4338(1):44-50.
    PMID: 29245726 DOI: 10.11646/zootaxa.4338.1.2
    Drepanosticta rahmani sp. nov. (holotype ♂, steep tributary to stream in hills between Baling and Gulai, north west Kedah, Malaysia, 15 xi 2016, leg. R.A. Dow, to be deposited in the Natural History Museum, London) is described from both sexes.
    Matched MeSH terms: Animal Structures
  7. Revision of the Genus Leptogomphus Selys in Borneo, including gene trees and a two marker molecular phylogeny (Odonata: Anisoptera: Gomphidae)
    Dow RA, Stokvis F, Ngiam RWJ
    Zootaxa, 2017 Nov 29;4358(2):201-257.
    PMID: 29245467 DOI: 10.11646/zootaxa.4358.2.1
    The Bornean members of the genus Leptogomphus Selys are revised. Two new species are described: Leptogomphus schieli sp. nov. (holotype ♂, Gunung Penrissen, Kuching Division, Sarawak, Malaysia, to be deposited in BMNH) and Leptogomphus sii sp. nov. (holotype ♂, Sungai Sii, upper Baram, Miri Division, Sarawak, Malaysia, in RMNH). Leptogomphus mariae Lieftinck, 1948 is considered to be a junior synonym of L. coomansi Laidlaw, 1936. The true male of L. pasia van Tol, 1990 is described for the first time; male specimens previously treated as L. pasia or L. cf pasia actually belong to a taxon closely allied to, and possibly merely a form of, L. coomansi. A description is given of the female of another new species, but the species is not named in the absence of the male. Female specimens from south-western Sarawak, similar to L. williamsoni Laidlaw, 1912, are considered likely to also represent a distinct species. The female of L. pendleburyi Laidlaw, 1934 is described for the first time and fresh descriptions of the males of L. coomansi, L. pendleburyi and L. williamsoni, and the female of L. coomansi are given. Keys to both sexes, and distribution maps are given. A molecular analysis of the Bornean species (except L. schieli) using the COI and ITS markers is presented.
    Matched MeSH terms: Animal Structures
  8. Fulltext Two new species of Parahesione (Annelida: Hesionidae) associated with ghost shrimps (Crustacea: Decapoda) and their phylogenetic relationships
    Jimi N, Nakajima H, Sato T, Gonzalez BC, Woo SP, Rouse GW, et al.
    PeerJ, 2023;11:e16346.
    PMID: 37927790 DOI: 10.7717/peerj.16346
    Two new species of Hesionidae, Parahesione pulvinata sp. nov. and Parahesione apiculata sp. nov. are described based on materials collected at tidal flats in Okinawa (Japan) from burrows of the ghost shrimps Neocallichirus jousseaumei and Glypturus armatus. The two new species are characterized by having eight enlarged cirri, dorsal cirrophores with dorsal foliose lobe and biramous parapodia, and by lacking median antenna. Parahesione apiculata sp. nov. has digitate lobes on the posterior margin of the dorsal foliose lobe (absent in P. pulvinata sp. nov.). The two new species were never found outside the ghost shrimp burrows, suggesting they are obligate symbionts. Phylogenetic analyses based on four concatenated genes suggest that the symbiotic lifestyle has evolved several times in Hesionidae.
    Matched MeSH terms: Animal Structures
  9. The first species of Eutheimorphus Franz & Lbl in Thailand (Coleoptera, Staphylinidae, Scydmaeninae)
    Jaoszyski P
    Zootaxa, 2023 Aug 02;5323(3):435-439.
    PMID: 38220955 DOI: 10.11646/zootaxa.5323.3.8
    Up to date, Eutheimorphus Franz & Lbl included a sole species known from a holotype male collected in Sabah, Borneo. An occurrence of this enigmatic and extremely rare genus in Thailand is reported, and Eutheimorphus thailandicus sp. n. is described. Among diagnostic characters are unique grooves on the head and a symmetrical (in contrast to strongly asymmetrical in E. paradoxus Franz & Lbl) set of endophallic sclerites.
    Matched MeSH terms: Animal Structures
  10. Dressed in black. A New Ansonia Stoliczka, 1870 (Lissamphibia: Anura: Bufonidae) from Gunung Murud, Sarawak, East Malaysia (Borneo)
    Hertwig ST, Min PY, Haas A, Das I
    Zootaxa, 2014.
    PMID: 24943439 DOI: 10.11646/zootaxa.3814.3.9
    A new species of stream toad of the genus Ansonia is described from Gunung Murud, Pulong Tau National Park, of northern Sarawak, Malaysia, Borneo. Ansonia vidua, sp. nov., is morphologically distinguished from its Bornean congeners by the following combination of characters: medium size (SVL of adult females 33.5-34.4 mm); body uniformly black-brown in life; absence of a visible pattern on dorsum or limbs; presence of two low interorbital ridges; shagreened skin on dorsum, sides and upper surfaces of the limbs with numerous homogeneously small, rounded warts; first finger shorter than second; reduced webbing between the toes and an absence of a sharp tarsal ridge. Uncorrected genetic distances between related taxa of > 4.3% in 16S rRNA gene support its status as a hitherto undescribed species.
    Matched MeSH terms: Animal Structures/anatomy & histology
  11. The phylogenetic relationships of three new species of the Cyrtodactylus pulchellus complex (Squamata: Gekkonidae) from poorly explored regions in northeastern Peninsular Malaysia
    Grismer LL, Wood PL, Anuar S, Quah ES, Muin MA, Mohamed M, et al.
    Zootaxa, 2014;3786:359-81.
    PMID: 24869541 DOI: 10.11646/zootaxa.3786.3.6
    An integrative taxonomic analysis of three newly discovered populations of the gekkonid genus Cyrtodactylus Gray from Merapoh, Pahang; Gunung Stong, Kelantan; and Gunung Tebu, Terengganu indicate they are part of the C. pulchellus complex and each is a new species and thusly named Cyrtodactylus sharkari sp. nov., C. jelawangensis sp. nov., and C. timur sp. nov., respectively. Each species bears a unique suite of morphological and color pattern characters separating them from each other and all other nominal species in the C. pulchellus complex. Their phylogenetic relationships to each other and other species in the C. pulchellus complex were unexpected in that they are not in accordance with the general distribution of the species in this complex, underscoring the intricate historical biogeography of the Thai-Malay Peninsula. These descriptions highlight our current lack of knowledge concerning the herpetological diversity and distribution of species in northeastern Peninsular Malaysia.
    Matched MeSH terms: Animal Structures/anatomy & histology
  12. Three new species of Merizocotyle Cerfontaine, 1894 (Monogenea: Monocotylidae) from the nasal tissues of dasyatid rays collected off Malaysian and Indonesian Borneo
    Chisholm LA, Whittington ID
    Syst Parasitol, 2012 Jun;82(2):167-76.
    PMID: 22581252 DOI: 10.1007/s11230-012-9358-7
    Three new species of Merizocotyle Cerfontaine, 1894 (Monogenea: Monocotylidae) are described from the nasal tissues of stingrays collected off Borneo. Merizocotyle macrostrobus n. sp. is described from the dwarf whipray Himantura walga (Müller & Henle) collected in shallow waters off Sematan, Sarawak, Malaysia. This species can be distinguished from the other members of the genus by the morphology of the sclerotised male copulatory organ, which is long with many twists and loops. The vaginae of this species are also long and looped. Merizocotyle papillae n. sp. is described from the roughnose stingray Pastinachus solocirostris Last, Manjaji & Yearsley collected off Sematan and Mukah, Sarawak, Malaysia. It is distinguished from the other species of Merizocotyle by the morphology of the male copulatory organ, which is a sclerotised tube that expands slightly and then tapers at the distal end, and by the presence of papillae on the dorsal edge of the haptor. Merizocotyle rhadinopeos n. sp. is described from the whitenose whip ray Himantura uarnacoides (Bleeker) collected off Manggar, East Kalimantan, Indonesia. It can be differentiated by the male copulatory organ, which is a short, narrow, curved, sclerotised tube tapering distally, and the path of the ovary, which runs anteriorly to the base of the oötype. We also provide details of new host and/or locality records for M. australensis (Beverley-Burton & Williams, 1989) Chisholm, Wheeler & Beverley-Burton, 1995, M. icopae Beverley-Burton & Williams, 1989 and M. pseudodasybatis (Hargis, 1955) Chisholm, Wheeler & Beverley-Burton, 1995.
    Matched MeSH terms: Animal Structures/anatomy & histology
  13. Morphology of immature stages of Megaselia spiracularis Schmitz (Diptera: Phoridae)
    Dian-Xing F, Guang-Chun L
    Microsc Res Tech, 2012 Sep;75(9):1297-303.
    PMID: 22522698 DOI: 10.1002/jemt.22064
    In addition to causing myiasis in humans, Megaselia spiracularis Schmitz has also been reported as a forensically important fly. In this study, we presented the morphology of all larval instars and puparium of M. spiracularis using scanning electron microscopy. The first instar larva was composed of 12 segments. Antennae and maxillary palp complex were visible. Two spiracular slits could be seen at the posterior spiracle. The branch of posterior spiracular hairs was approximately equal to the palm-formed base in length. Second and third larval instars were very similar to first instar, except for the presence of anterior spiracle. The labium of the second instar larva was triangular and ventrally curved, whereas it was a bilobed structure and the tip forked in the first instar. The bubble membrance comprised of ≈40 globules presented at the third instar larvae. Puparia showed a retracted cephalic region and a pair of pupal respiratory horns on the dorsum. A comparison of the morphological features between immature stages of M. spiracularis and M. scalaris, a forensically important fly indoors in Germany, Malaysia, and China, was discussed.
    Matched MeSH terms: Animal Structures/ultrastructure
  14. A new montane species of Philautus (Amphibia: Anura: Rhacophoridae) from western Sarawak, Malaysia, Borneo
    Dehling JM, Dehling M
    Zootaxa, 2013;3686:277-88.
    PMID: 26473218
    A new species of Philautus is described from western Sarawak. The new species was collected in lower montane forest in two national parks in Sarawak and recorded from another park. It differs from its congeners by a unique combination of morphological characters, including a long, acuminate snout, long legs, and comparatively extensive toe webbing. The advertisement call of the new species differs from all calls of other species that have been analyzed so far. Comparison of the mitochondrial 16S rRNA gene sequence corroborates its distinct specific status.
    Matched MeSH terms: Animal Structures/anatomy & histology
  15. Identification and characterization of antibacterial compound(s) of cockroaches (Periplaneta americana)
    Ali SM, Siddiqui R, Ong SK, Shah MR, Anwar A, Heard PJ, et al.
    Appl Microbiol Biotechnol, 2017 Jan;101(1):253-286.
    PMID: 27743045 DOI: 10.1007/s00253-016-7872-2
    Infectious diseases remain a significant threat to human health, contributing to more than 17 million deaths, annually. With the worsening trends of drug resistance, there is a need for newer and more powerful antimicrobial agents. We hypothesized that animals living in polluted environments are potential sources of antimicrobials. Under polluted milieus, organisms such as cockroaches encounter different types of microbes, including superbugs. Such creatures survive the onslaught of superbugs and are able to ward off disease by producing antimicrobial substances. Here, we characterized antibacterial properties in extracts of various body organs of cockroaches (Periplaneta americana) and showed potent antibacterial activity in crude brain extract against methicillin-resistant Staphylococcus aureus and neuropathogenic Escherichia coli K1. The size-exclusion spin columns revealed that the active compound(s) are less than 10 kDa in molecular mass. Using cytotoxicity assays, it was observed that pre-treatment of bacteria with lysates inhibited bacteria-mediated host cell cytotoxicity. Using spectra obtained with LC-MS on Agilent 1290 infinity liquid chromatograph, coupled with an Agilent 6460 triple quadruple mass spectrometer, tissues lysates were analysed. Among hundreds of compounds, only a few homologous compounds were identified that contained the isoquinoline group, chromene derivatives, thiazine groups, imidazoles, pyrrole-containing analogs, sulfonamides, furanones, and flavanones and known to possess broad-spectrum antimicrobial properties and anti-inflammatory, anti-tumour, and analgesic properties. Further identification, characterization, and functional studies using individual compounds can act as a breakthrough in developing novel therapeutics against various pathogens including superbugs.
    Matched MeSH terms: Animal Structures/chemistry
  16. Heads or tails: exaggerated morphologies in relation to the use of large bamboo internodes in two lizard beetles, Doubledaya ruficollis and Oxylanguria acutipennis (Coleoptera: Erotylidae: Languriinae)
    Toki W, Matsuo S, Pham HT, Meleng P, Lee CY
    Naturwissenschaften, 2019 Aug 27;106(9-10):50.
    PMID: 31456022 DOI: 10.1007/s00114-019-1645-6
    The cavities of bamboos (Poaceae) are used by various animals. Most of the animals access these cavities either by existing cracks or by excavating bamboos with soft walls or small, thin-walled bamboos. Only a few animals excavate into the cavities of large and thick- and hard-walled internodes of mature bamboos. We studied two lizard beetle species (Coleoptera: Erotylidae: Languriinae), Doubledaya ruficollis and Oxylanguria acutipennis, that excavate into large internode cavities of recently dead mature bamboos and have morphological modifications. We observed that females of D. ruficollis used their mandibles to bore oviposition holes on Schizostachyum sp. (mean wall thickness = 3.00 mm) and O. acutipennis did so on Dendrocalamus sp. (3.37 mm) bamboos. Previous studies suggested that the markedly asymmetrical mandibles and needle-like ovipositors of females in the genus Doubledaya are adaptive traits for excavating hard-walled bamboos for oviposition. Therefore, we measured their mandibular lengths and ovipositor lengths. D. ruficollis females had greater asymmetry in the mandibles and shorter and less-sclerotized ovipositors than females of congeners using small bamboos. In contrast, O. acutipennis females had slightly asymmetrical mandibles and elongated, well-sclerotized ovipositors. Oviposition holes of D. ruficollis were cone-shaped (evenly tapering), whereas those of O. acutipennis were funnel-shaped (tube-like at the internal apex). This suggests that D. ruficollis females excavate oviposition holes using the mandibles only, and O. acutipennis females use both the mandibles and ovipositors. These differences suggest different oviposition-associated morphological specialization for using large bamboos: the extremely asymmetrical mandibles in D. ruficollis and elongated, needle-like ovipositors in O. acutipennis.
    Matched MeSH terms: Animal Structures/anatomy & histology
  17. Fulltext Interleukin-27 exhibited anti-inflammatory activity during Plasmodium berghei infection in mice
    Fazalul Rahiman SS, Basir R, Talib H, Tie TH, Chuah YK, Jabbarzare M, et al.
    Trop Biomed, 2013 Dec;30(4):663-80.
    PMID: 24522137 MyJurnal
    Interleukin-27 (IL-27) has a pleiotropic role either as a pro-inflammatory or anti-inflammatory cytokine in inflammatory related diseases. The role and involvement of IL-27 during malaria was investigated and the effects of modulating its release on the production of major inflammatory cytokines and the histopathological consequences in major affected organs during the infection were evaluated. Results showed that IL-27 concentration was significantly elevated throughout the infection but no positive correlation with the parasitaemia development observed. Augmentation of IL-27 significantly elevated the release of anti-inflammatory cytokine, IL-10 whereas antagonising and neutralising IL-27 produced the opposite. A significant elevation of pro-inflammatory cytokines (IFN-γ and IL-6) was also observed, both during augmentation and inhibition of IL-27. Thus, it is suggested that IL-27 exerts an anti-inflammatory activity in the Th1 type response by signalling the production of IL-10 during malaria. Histopathological examination showed sequestration of PRBC in the microvasculature of major organs in malarial mice. Other significant histopathological changes include hyperplasia and hypertrophy of the Kupffer cells in the liver, hyaline membrane formation in lung tissue, enlargement of the white and red pulp followed by the disappearance of germinal centre of the spleen, and tubular vacuolation of the kidney tissues. In conclusion, it is suggested that IL-27 may possibly acts as an anti-inflammatory cytokine during the infection. Modulation of its release produced a positive impact on inflammatory cytokine production during the infection, suggesting its potential in malaria immunotherapy, in which the host may benefit from its inhibition.
    Matched MeSH terms: Animal Structures/pathology
  18. Fulltext Simulium (Gomphostilbia) sofiani, a new species of black fly (Diptera: Simuliidae) from peninsular Malaysia
    Takaoka H, Sofian-Azirun M, Hashim R
    Trop Biomed, 2011 Aug;28(2):389-99.
    PMID: 22041761
    Simulium (Gomphostilbia) sofiani sp. nov. is described on the basis of reared adult female, male, pupal and larval specimens collected from Cameron Highlands, Pahang state, Malaysia. This new species is placed in the ceylonicum species-group within the subgenus Gomphostilbia and is easily distinguished from all the related known species by the combination of the following characteristics: an elongate sensory vesicle and yellow hair tuft on the stem vein of the wing in the female, the greater number of large upper-eye facets (15 or 16 vertical columns and 15 or 16 horizontal rows) and almost entirely darkened hind basitarsus in the male, and the gill bearing a long common basal stalk and 8 filaments arranged as [(1+2)+(1+2)] +2 filaments from dorsal to ventral in the pupa.
    Matched MeSH terms: Animal Structures/anatomy & histology
  19. Isolation and identification of bacterial populations of zoonotic importance from captive non-venomous snakes in Malaysia
    Abba Y, Ilyasu YM, Noordin MM
    Microb Pathog, 2017 Jul;108:49-54.
    PMID: 28478198 DOI: 10.1016/j.micpath.2017.04.038
    AIM: Captivity of non-venomous snakes such as python and boa are common in zoos, aquariums and as pets in households. Poor captivity conditions expose these reptiles to numerous pathogens which may result in disease conditions. The purpose of this study was to investigate the common bacteria isolated from necropsied captive snakes in Malaysia over a five year period.

    MATERIALS AND METHODS: A total of 27 snake carcasses presented for necropsy at the Universiti Putra Malaysia (UPM) were used in this survey. Samples were aseptically obtained at necropsy from different organs/tissues (lung, liver, heart, kindey, oesophagus, lymph node, stomach, spinal cord, spleen, intestine) and cultured onto 5% blood and McConkey agar, respectively. Gram staining, morphological evaluation and biochemical test such as oxidase, catalase and coagulase were used to tentatively identify the presumptive bacterial isolates.

    RESULTS: Pythons had the highest number of cases (81.3%) followed by anaconda (14.8%) and boa (3.7%). Mixed infection accounted for 81.5% in all snakes and was highest in pythons (63%). However, single infection was only observed in pythons (18.5%). A total of 82.7%, 95.4% and 100% of the bacterial isolates from python, anaconda and boa, respectively were gram negative. Aeromonas spp was the most frequently isolated bacteria in pythons and anaconda with incidences of 25 (18%) and 8 (36.6%) with no difference (p > 0.05) in incidence, respectively, while Salmonella spp was the most frequently isolated in boa and significantly higher (p 

    Matched MeSH terms: Animal Structures/microbiology
  20. Fulltext Penetration mechanics of elongated female and male genitalia of earwigs
    Matsumura Y, Kamimura Y, Lee CY, Gorb SN, Rajabi H
    Sci Rep, 2021 04 12;11(1):7920.
    PMID: 33846369 DOI: 10.1038/s41598-021-86864-1
    We unveiled the penile penetration mechanics of two earwig species, Echinosoma horridum, whose intromittent organ, termed virga, is extraordinarily long, and E. denticulatum, whose virga is conversely short. We characterised configuration, geometry, material and bending stiffness for both virga and spermatheca. The short virga of E. denticulatum has a material gradient with the stiffer base, whereas the long virga of E. horridum and the spermathecae of both species are homogeneously sclerotised. The long virga of E. horridum has a lower bending stiffness than the spermatheca. The virga of E. denticulatum is overall less flexible than the spermatheca. We compared our results to a previous study on the penetration mechanics of elongated beetle genitalia. Based on the comparison, we hypothesised that the lower stiffness of the male intromittent organ comparing to the corresponding female structure is a universal prerequisite for the penetration mechanics of the elongated intromittent organ in insects.
    Matched MeSH terms: Animal Structures/ultrastructure
Related Terms
Filters
Contact Us

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links