Hydaticus pacificus var. latihamatus Régimbart, 1899
Hydaticus pacificus var. lunatus Régimbart, 1899
Dytiscus ruficollis Fabricius, 1787
Subspeciesedit
Three subspecies identified.
Hydaticus pacificus andamanicus - India, Andaman Islands
Hydaticus pacificus conspersus - Japan, Taiwan, China
Hydaticus pacificus discindens - Sri Lanka
Hydaticus pacificus lunatus - Malaysia, Philippines and Indonesia
Hydaticus pacificus pacificus - India, Myanmar, Thailand, China, Cambodia, Laos, Vietnam, Malaysia, Singapore, Philippines, Indonesia
The nominate subspecies pacificus shows following features.[4]
ssp. ''conspersus''
Body oblong-oval, moderately convex and broadest distinctly behind middle. Body length is about 14.1 to 16.6 mm. Head yellowish to reddish-brown in color. Some extended dark brown to black patches found along and between eyes and on vertex. Head with fine dense punctation and scattered stronger punctures and without microreticulation. Pronotum yellowish to reddish-brown with similar patches. Elytron dark brown to black with yellowish to reddish-brown. Elytra with very fine punctation and scattered stronger punctures; with fine microreticulation. Pronotum consists with very fine, dense punctation and scattered stronger punctures with traces of very fine microreticulation. There is a postmedian mark connected to lateral band, but sometimes reduced to a small spot. Ventrum dark reddish-brown to black, with yellowish to reddish-brown pronotum and epipleura regions. Ventrum with moderately dense punctation with fine microreticulation. Antennae yellowish to reddish-brown. First two pairs of legs are reddish-brown, whereas hind legs are dark-brown to black in color.[4]
The subspecies andamanicus has a total length of about 13.1 to 15.5 mm. Much darker coloration on head and pronotum than ssp. pacificus. Elytral markings and body colors similar to ssp. pacificus. Hind tarsi more slender with ciliated metatarsomeres. The subspecies conspersus has a total body length of 14.5 to 16.6 mm. Dark coloration on head less extended. Pale elytral markings are more extended on lateral sides with many dark irrorations. The subspecies lunatus has a total length of 14.3 to 16.8 mm. There is a distinctly enlarged pale postmedian mark on elytron. Subspecies discindens has an oblong-oval, moderately convex body which is broadest distinctly behind middle. Total length is 13.1 to 16.5 mm. Pronotum with a complete dark brown to black longitudinal band in middle.[4]
Biologyedit
After mating, adult female has been observed to deposit eggs singly on the surface of the Salvinia molesta. Newly laid eggs are white in color. Eggs are long ellipsoid with a slight convexity at the ventral side. Egg is about 2.2 mml long.[5]
Referencesedit
^"Catalogue of the diving beetles of India and adjacent countries (Coleoptera: Dytiscidae)". Skörvnöpparn, Umeå Supplement 3, 2012: 1-77. Retrieved 2021-08-07.
^ abc"Revision of the species of the Hydaticus (Prodaticus) pacificus group of the Palearctic, Oriental and Australian Regions, and description of a new species of the H. (P.) bihamatus group" (PDF). Koleopterologische Rundschau 86 9–45 Wien, September 2016. Retrieved 2021-08-07.
^"Embryonic Development of a Diving Beetle, Hydaticus pacificus Aubé (Insecta: Coleoptera; Dytiscidae): External Morphology and Phylogenetic Implications*". Comparative embryology of Coleoptera. Retrieved 2021-08-07.
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hydaticus, pacificus, species, predaceous, diving, beetle, found, south, south, east, asia, pacificusscientific, classificationdomain, eukaryotakingdom, animaliaphylum, arthropodaclass, insectaorder, coleopterafamily, dytiscidaesubfamily, dytiscinaetribe, hyda. Hydaticus pacificus is a species of predaceous diving beetle found in South and South East Asia 1 2 3 Hydaticus pacificusHydaticus pacificus pacificusScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ArthropodaClass InsectaOrder ColeopteraFamily DytiscidaeSubfamily DytiscinaeTribe HydaticiniGenus HydaticusSpecies H pacificusBinomial nameHydaticus pacificusAube 1838SynonymsHydaticus banksii Crotch 1872 Hydaticus pacificus var ceylonicus Guignot 1935 Hydaticus discindens Walker 1858 Hydaticus pacificus var latihamatus Regimbart 1899 Hydaticus pacificus var lunatus Regimbart 1899 Dytiscus ruficollis Fabricius 1787Subspecies editThree subspecies identified Hydaticus pacificus andamanicus India Andaman Islands Hydaticus pacificus conspersus Japan Taiwan China Hydaticus pacificus discindens Sri Lanka Hydaticus pacificus lunatus Malaysia Philippines and Indonesia Hydaticus pacificus pacificus India Myanmar Thailand China Cambodia Laos Vietnam Malaysia Singapore Philippines IndonesiaThe nominate subspecies pacificus shows following features 4 nbsp ssp conspersus Body oblong oval moderately convex and broadest distinctly behind middle Body length is about 14 1 to 16 6 mm Head yellowish to reddish brown in color Some extended dark brown to black patches found along and between eyes and on vertex Head with fine dense punctation and scattered stronger punctures and without microreticulation Pronotum yellowish to reddish brown with similar patches Elytron dark brown to black with yellowish to reddish brown Elytra with very fine punctation and scattered stronger punctures with fine microreticulation Pronotum consists with very fine dense punctation and scattered stronger punctures with traces of very fine microreticulation There is a postmedian mark connected to lateral band but sometimes reduced to a small spot Ventrum dark reddish brown to black with yellowish to reddish brown pronotum and epipleura regions Ventrum with moderately dense punctation with fine microreticulation Antennae yellowish to reddish brown First two pairs of legs are reddish brown whereas hind legs are dark brown to black in color 4 The subspecies andamanicus has a total length of about 13 1 to 15 5 mm Much darker coloration on head and pronotum than ssp pacificus Elytral markings and body colors similar to ssp pacificus Hind tarsi more slender with ciliated metatarsomeres The subspecies conspersus has a total body length of 14 5 to 16 6 mm Dark coloration on head less extended Pale elytral markings are more extended on lateral sides with many dark irrorations The subspecies lunatus has a total length of 14 3 to 16 8 mm There is a distinctly enlarged pale postmedian mark on elytron Subspecies discindens has an oblong oval moderately convex body which is broadest distinctly behind middle Total length is 13 1 to 16 5 mm Pronotum with a complete dark brown to black longitudinal band in middle 4 Biology editAfter mating adult female has been observed to deposit eggs singly on the surface of the Salvinia molesta Newly laid eggs are white in color Eggs are long ellipsoid with a slight convexity at the ventral side Egg is about 2 2 mml long 5 References edit Catalogue of the diving beetles of India and adjacent countries Coleoptera Dytiscidae Skorvnopparn Umea Supplement 3 2012 1 77 Retrieved 2021 08 07 Hydaticus pacificus Aube 1838 www gbif org Retrieved 2021 08 10 IRMNG Hydaticus pacificus Aube 1838 www irmng org Retrieved 2021 08 10 a b c Revision of the species of the Hydaticus Prodaticus pacificus group of the Palearctic Oriental and Australian Regions and description of a new species of the H P bihamatus group PDF Koleopterologische Rundschau 86 9 45 Wien September 2016 Retrieved 2021 08 07 Embryonic Development of a Diving Beetle Hydaticus pacificus Aube Insecta Coleoptera Dytiscidae External Morphology and Phylogenetic Implications Comparative embryology of Coleoptera Retrieved 2021 08 07 nbsp This Dytiscidae related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Hydaticus pacificus amp oldid 1207614105, wikipedia, wiki, book, books, library,
