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ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Koleopterologische Rundschau Jahr/Year: 2013 Band/Volume: 83_2013 Autor(en)/Author(s): Michat Mariano C. Artikel/Article: Description of the larvae of Thermonectus alfredi GRIFFINI, 1898 (Coleoptera: Dytiscidae). 7-15 ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at 6 Koleopt. Rdsch. 83 (2013) Koleopterologische Rundschau 83 7–15 Wien, September 2013 Remarks: This species belongs to the O. grootaerti species group, and is closely allied to O. angkor TIAN & DEUVE, 2006, but its aedeagus with the apical lamella is much longer and thinner than that of O. angkor. Description of the larvae of Etymology: The name is proposed in honor of our good friend Dr. Thierry Deuve, a well-known Thermonectus alfredi GRIFFINI, 1898 carabidologist in the Muséum National d’Histoire Naturelle, Paris, France. (Coleoptera: Dytiscidae) Distribution: Southern Vietnam. M.C. MICHAT Acknowledgements Abstract We thank Alain Drumont (IRSNB) and Jiři Hájek (NMPC) for providing interesting specimens. Our sincere thanks are also due to Thierry Deuve and Azadeh Taghavian (Muséum National The three larval instars of Thermonectus alfredi GRIFFINI, 1898 (Coleoptera: Dytiscidae) are described and illustrated for the first time, emphasizing the morphometry and chaetotaxy. In this species, the d’Histoire Naturelle, Paris) for their assistance on various aspects. The first author would like to median process of the prementum is slightly bifid apically, bearing two spine-like setae (LA8), which express his hearty appreciations to the Muséum National d’Histoire Naturelle, Paris for are diagnostic features of the genus Thermonectus DEJEAN, 1833. The first instar of T. alfredi differs providing financial and logistic support for his study. This study is also sponsored in part by the from that of T. succinctus (AUBÉ, 1838) in the number of additional spine-like setae on the dorsal National Natural Science Foundation of China (Grant no. 41271062). surface of the stipes and on the anterodorsal surface of the prementum, and in the presence of additional anterodistal setae on the metafemur. On the other hand, the third instar of T. alfredi differs from those of T. basillaris (HARRIS, 1829) and T. succinctus in the number of secondary setae on the References femur and the metatibia, and from that of T. nigrofasciatus ornaticollis (AUBÉ, 1838) in the length of seta LA8, which is shorter than the median process of the prementum. ABHITHA, P., SABU, T.K. & TIAN, M.Y. 2009: Termitophilous Orthogonius (Coleoptera: Carabidae) from South India. – Oriental Insects 43: 369–378. Key words: Coleoptera, Dytiscidae, Aciliini, larval morphology, chaetotaxy, Neotropical Region, TIAN, M.Y. & DEUVE, T. 2008: Key to species of the genus Orthogonius Macleay of Cambodia, with Argentina. descriptions of four new species (Coleoptera: Caraboidea: Orthogoniini). – Bulletin de l’institut Royal des Sciences Naturelles de Belgique, Entomologie 78: 215–220. Introduction TIAN, M.Y. & DEUVE, T. 2009: A review of the genus Actenoncus Chaudoir (Coleoptera: Caraboidea: Orthogoniini). – Zootaxa 2135: 57–64. The diving-beetle genus Thermonectus DEJEAN, 1833 (Dytiscinae: Aciliini) includes 19 species (NILSSON 2010). Their larvae are characterized by a planktonic lifestyle (WILSON 1923, MICHAT TIAN, M.Y. & DEUVE, T. 2010: A provisional species checklist of the Oriental Orthogoninae (Coleoptera: & TORRES 2005). Whereas this habit is shared with other members of the tribe Aciliini, it is Caraboidea). – Entomotaxonomia 32 (suppl.): 137–148. contrasting with other groups of diving beetles in which the larvae live mainly on the bottom or TIAN, M.Y., DEUVE, T. & FELIX, R. 2012: Orthogonius species and diversity in Thailand (Coleoptera, close to aquatic plants. Caraboidea, Orthogoniini), a result from the TIGER project. – ZooKeys 164: 51–90. Larval morphology of members of Thermonectus is poorly known, with only five species known Ming-Yi TIAN as larvae: T. nigrofasciatus ornaticollis (AUBÉ, 1838) (WILSON 1923), T. basillaris (HARRIS, Department of Entomology, College of Natural Resources and Environment, South China Agricultural University, 1829) (WILSON 1923, BARMAN & CARROLL 2002, CARROLL & BARMAN 2004, BARMAN & Wushan, Guangzhou, 510640, China ([email protected]) EPLER 2005), T. circumscriptus (LATREILLE, 1809) (BERTRAND 1931), T. succinctus (MICHAT & TORRES 2005, ALARIE et al. 2011), and T. alfredi (CRESPO 1987). See also SPANGLER (1966) for Erich KIRSCHENHOFER Otto Elsner Gasse 10–12, A – 2380, Perchtoldsdorf, Austria ([email protected]) description of an unidentified larva. The existing descriptions have different degrees of detail, and chaetotaxy was emphasized only in few cases, which prevent in-depth comparisons among the species (see MICHAT & TORRES 2005 for a summary of the state of knowledge of the larval morphology of the genus). Thermonectus alfredi GRIFFINI, 1898 is a large species that lives in mountainous areas in northwestern Argentina and in the Ventania system in central eastern Argentina (TRÉMOUILLES 1989). The only larval description for this species (mature larva) can be found in an unpublished thesis by CRESPO (1987), not widely available. The results of the present paper are based on the discovery of all instars of T. alfredi in the Ventania system, which gives the opportunity to provide a description and chaetotaxic analysis of the larvae. This paper is meant to be a step toward a better knowledge of the genus Thermonectus, and has the following goals: 1) to describe and illustrate the three larval instars of T. alfredi, 2) to perform detailed morphometric and chaetotaxic analyses of selected larval structures, and 3) to compare these larvae with those of other species of the genus. ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at 8 Koleopt. Rdsch. 83 (2013) Material and methods Five specimens of instar I, three of instar II and four of instar III were used for the descriptions. The larvae were collected in association with adults at the following locality: Argentina, Buenos Aires Province, Sierra de la Ventana, Ernesto Tornquist Park, December 2006. Specimens were cleared in lactic acid, dissected and mounted on glass slides with polyvinyl- lacto-glycerol. Observation (at magnifications up to 1000 ×) and drawings were made using an Olympus CX31 compound microscope equipped with a camera lucida. Drawings were scanned and edited digitally. The material is deposited in the collection of the author (Laboratory of Entomology, Buenos Aires University, Argentina). The methods and terms used in the present paper follow those employed in previous papers dealing with the larval morphology and chaetotaxy of members of the subfamily Dytiscinae. The reader is referred to MICHAT & TORRES (2005) and ALARIE et al. (2011) for a complete list of the terms commonly used in the study of dytiscid larvae. Table 1: Measurements and ratios for the three larval instars of Thermonectus alfredi. Measure Instar I (n = 3) Instar II (n = 3) Instar III (n = 3) HL (mm) 1.46–1.53 2.20–2.26 3.14–3.23 HW (mm) 1.18–1.21 1.73–1.75 2.40–2.45 FRL (mm) 0.66–0.70 0.98–1.01 1.33–1.39 OCW (mm) 0.43–0.45 0.73–0.75 1.11–1.20 HL/HW 1.23–1.30 1.26–1.29 1.31–1.34 HW/OCW 2.64–2.85 2.33–2.38 2.00–2.16 COL/HL 0.54–0.55 0.55–0.56 0.57–0.58 FRL/HL 0.45–0.46 0.44–0.45 0.42–0.43 A/HW 0.46–0.49 0.43–0.46 0.42–0.44 A1/A3 0.81–0.85 0.76–0.82 0.77–0.89 A2/A3 0.85–0.89 0.83–0.86 0.85–0.94 A4/A3 0.31–0.32 0.19–0.24 0.11–0.13 MNL/MNW 2.65–2.70 2.74–2.79 2.95–3.44 MNL/HL 0.43–0.45 0.42–0.44 0.43–0.44 PPF/MP1 0.33–0.36 0.27–0.33 0.24–0.27 A/MP 1.68–1.73 1.68–1.73 1.59–1.67 MP1/MP2 0.60–0.71 0.69–0.85 0.75–0.85 MP3/MP2 1.85–2.24 1.69–1.73 1.40–1.50 GA/MP1 2.75–2.91 2.44–2.89 2.53–2.80 MP/LP 0.78–0.83 0.74–0.76 0.74–0.76 LP2/LP1 0.93–0.95 0.79–0.83 0.70–0.80 L3 (mm) 3.11–3.25 4.76–4.92 7.19–7.46 L3/L1 1.03–1.05 1.07–1.09 1.12–1.14 L3/L2 0.97–1.02 0.99–1.00 1.01–1.04 L3/HW 2.62–2.68 2.76–2.81 3.00–3.05 L3 (CO/FE) 0.69–0.76 0.77–0.78 0.84–0.86 L3 (TI/FE) 0.75–0.76 0.71–0.73 0.69–0.70 L3 (TA/FE) 0.53–0.57 0.50–0.51 0.46–0.47 L3 (CL/TA) 0.40–0.42 0.28–0.29 0.22–0.24 LAS (mm) 1.50–1.63 2.28–2.30 3.18–3.28 LAS/HW 1.26–1.38 1.30–1.33 1.30–1.36 U (mm) 0.59–0.64 0.86–0.88 1.18–1.23 U/LAS 0.38–0.39 0.38 0.36–0.39 U/HW 0.49–0.53 0.49–0.51 0.49–0.51 ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at 8 Koleopt. Rdsch. 83 (2013) MICHAT: Description of the larvae of Thermonectus alfredi (DYTISCIDAE) 9 Material and methods Results Five specimens of instar I, three of instar II and four of instar III were used for the descriptions.
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  • Diving Beetles of the Sakaerat Biosphere Reserve, Nakhon Ratchasima Province, with Four New Records for Thailand

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    SPIXIANA 41 1 91-98 München, Oktober 2018 ISSN 0341-8391 Diving beetles of the Sakaerat Biosphere Reserve, Nakhon Ratchasima Province, with four new records for Thailand (Coleoptera, Dytiscidae) Wisrutta Atthakor, Lars Hendrich, Narumon Sangpradub & Michael Balke Atthakor, W., Hendrich, L., Sangpradub, N. & Balke, M. 2018. Diving beetles of the Sakaerat Biosphere Reserve, Nakhon Ratchasima Province, with four new re- cords for Thailand (Coleoptera, Dytiscidae). Spixiana 41 (1): 91-98. A recent survey of the Dytiscidae of Sakaerat Biosphere Reserve, Nakhon Ratcha- sima Province in Northeast Thailand revealed 9 genera and 22 species, mainly collected in lentic habitats. Most identified species are widespread in the Indo- Malayan region. Copelatus oblitus Sharp, 1882, Cybister convexus Sharp, 1882, Hydro- vatus sinister Sharp, 1890 and Laccophilus latipennis Brancucci, 1983 are recorded for the first time in Thailand. The distributional range and ecology are discussed for each species. Photos of remarkable species and habitats in the dry and during the rainy season and a map are provided. Wisrutta Atthakor, Department of Biology, Faculty of Science, Srinakharinwirot University, Bangkok, Thailand; e-mail: [email protected] Lars Hendrich & Michael Balke, SNSB – Zoologische Staatssammlung, Münch- hausenstr. 21, 81247 München, Germany Narumon Sangpradub, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand; and Centre of Excellence on Biodiversity, Bangkok, Thailand Introduction Descriptions and photographs of the localities, showing the different seasonality in many habitats, This present work is based on the results of the are provided. The publication will be another step “Sakaerat Biosphere Reserve Expedition, 2013-2015” forwards to an annotated checklist of the Dytiscidae carried out by the senior author.
  • Microsoft Outlook

    Microsoft Outlook

    Joey Steil From: Leslie Jordan <[email protected]> Sent: Tuesday, September 25, 2018 1:13 PM To: Angela Ruberto Subject: Potential Environmental Beneficial Users of Surface Water in Your GSA Attachments: Paso Basin - County of San Luis Obispo Groundwater Sustainabilit_detail.xls; Field_Descriptions.xlsx; Freshwater_Species_Data_Sources.xls; FW_Paper_PLOSONE.pdf; FW_Paper_PLOSONE_S1.pdf; FW_Paper_PLOSONE_S2.pdf; FW_Paper_PLOSONE_S3.pdf; FW_Paper_PLOSONE_S4.pdf CALIFORNIA WATER | GROUNDWATER To: GSAs We write to provide a starting point for addressing environmental beneficial users of surface water, as required under the Sustainable Groundwater Management Act (SGMA). SGMA seeks to achieve sustainability, which is defined as the absence of several undesirable results, including “depletions of interconnected surface water that have significant and unreasonable adverse impacts on beneficial users of surface water” (Water Code §10721). The Nature Conservancy (TNC) is a science-based, nonprofit organization with a mission to conserve the lands and waters on which all life depends. Like humans, plants and animals often rely on groundwater for survival, which is why TNC helped develop, and is now helping to implement, SGMA. Earlier this year, we launched the Groundwater Resource Hub, which is an online resource intended to help make it easier and cheaper to address environmental requirements under SGMA. As a first step in addressing when depletions might have an adverse impact, The Nature Conservancy recommends identifying the beneficial users of surface water, which include environmental users. This is a critical step, as it is impossible to define “significant and unreasonable adverse impacts” without knowing what is being impacted. To make this easy, we are providing this letter and the accompanying documents as the best available science on the freshwater species within the boundary of your groundwater sustainability agency (GSA).
  • Mirasorvone: a Masked 20-Ketopregnane from the Defensive Secretion of a Diving Beetle (Thermonectus Marmoratus) (Steroids͞hemiketal͞dytiscidae)

    Mirasorvone: a Masked 20-Ketopregnane from the Defensive Secretion of a Diving Beetle (Thermonectus Marmoratus) (Steroids͞hemiketal͞dytiscidae)

    Proc. Natl. Acad. Sci. USA Vol. 95, pp. 2733–2737, March 1998 Chemistry Mirasorvone: A masked 20-ketopregnane from the defensive secretion of a diving beetle (Thermonectus marmoratus) (steroidsyhemiketalyDytiscidae) JERROLD MEINWALD*, QING HUANG*, JAN VRKOCˇ*†,KITHSIRI B. HERATH*, ZHI-CAI YANG*, FRANK SCHRODER¨ *, ATHULA B. ATTYGALLE*, VIKRAM K. IYENGAR‡,RANDY C. MORGAN§, AND THOMAS EISNER‡ *Department of Chemistry and ‡Section of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853; and §The Insectarium, Cincinnati Zoo and Botanical Gardens, Cincinnati, OH 45220 Contributed by Jerrold Meinwald, December 29, 1997 ABSTRACT The sunburst diving beetle, Thermonectus marmoratus, ejects a milky fluid from its prothoracic defensive glands when disturbed. Two major volatile components of this secretion are steroids; cybisterone (structure 7) constitutes about 20% of the volatiles, and a new steroid, mirasorvone, about 50%. Mirasorvone is assigned an 18-oxygenated preg- nane structure (structure 9) on the basis of extensive spec- troscopic data. Although no 18-oxygenated steroid has been described previously from an insect source, a closely related hormone with mineralocorticoid activity, 18-hydroxydeoxy- 1 corticosterone (structure 13), has been isolated from the have studied the defensive chemistry of Thermonectus mar- adrenal glands of rats. moratus, an aposematic dytiscid beetle recently named the ‘‘sunburst diving beetle’’ (12) (Fig. 1), and report the chemical In the mind of the general public, steroids loom large. Consider characterization of two steroida1 components from the secre- cholesterol (1). Millions of Americans are aware of their blood tion of its prothoracic defensive glands. cholesterol levels, and many take cholesterol biosynthesis inhibitors regularly. Steroidal oral contraceptives have been responsible for a quiet social revolution, and closely related MATERIALS AND METHODS steroids are widely used for the relief of postmenopausal The Beetle.