Les Hydrochus sont de petits Hydrophilidae aquatiques assez homogènes dans leur apparence générale. Comme ses congénères H. megaphallus a une forme plutôt allongée avec un contour discontinu entre pronotum et élytres, la tête large portant des yeux proéminents, le pronotum légèrement élargi vers l'avant, sculpté de reliefs et dépressions, les élytres avec des stries fortement ponctuées ; l'espèce est plus trapue que la plupart des autres Hydrochus, convexe et bien arrondie postérieurement, entièrement noire et sans reflet métallique, les élytres environ 1,5 fois plus longs que larges, avec les interstries impairs costiformes, plus élevés que les autres.
Détermination :
Délicate sur photo d'ensemble.
Espèces proches :
H. megaphallus peut être confondu seulement avec H. brevis dont il ne peut être séparé avec certitude qu'après examen de l'édéage.
Période d'observation :
Adulte rencontré du printemps à l'automne.
Biologie-éthologie :
Se développe dans les eaux stagnantes bien végétalisées, souvent en milieu boisé assez ouvert.
Biogéographie et écologie :
Espèce très peu fréquente, de répartition européenne depuis la France jusqu'à la Scandinavie, la Biélorussie et la Turquie ; absente de la région méditerranéenne.
Queney P. et Prévost P. 2021. Clé d'identification des Coléoptères aquatiques de France métropolitaine Myxophaga, Polyphaga Hydrophiloidea (adultes). Tome 1.
The map presents a summary at the 10 x 10 km grid of the observation data for the species transmitted to the SINP. These data have been subjected to validation filters.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Current distribution in metropolitan France
The map presents a reference distribution layer of the species at the scale of departments and marine sectors. The presence and absence data were established by expertise within a network of partners. This reference distribution is used in the validation process of the SINP data at the INPN level.
Distribution map from the Atlas of Departmental Biodiversity and Marine Sectors program
Certain presence
Corresponds to a report on the basis of at least one observation proved within a period of 10 years (20 years for little-known invertebrates) preceding the year and no presumption of extinction since obtaining the last data nor doubt on reproductive and implemented nature of this population. For migratory species, the presence indicated concerns areas of reproduction.
Probable presence
This status is based on one or more of the following criteria:
search of species incomplete but presence of supportive environments;
ecology of the species consistent with the hypothesis of his presence;
the last reliable sighting is older than 10 years compared to the reference date, no recent specific research and no presumption of extinction from that date [vertebrates, invertebrates and plants well studied (rhopalocera, grasshoppers, dragonflies ...)] ;
the last reliable observation being older than 20 years, no recent specific research and no presumption of extinction from that date [poorly known taxa: fungus, many invertebrates...].
Probable or certain absence
This point covers the absence, more difficult by nature to demonstrate than presence. This status is based on one or more of the following criteria:
intensive but unsuccessful targeted research;
lack of adequate environments;
unobserved species while its presence is easily detected;
unlikely presence for historical or biogeographical reasons.
This status must be assigned to a department in which the presence of the species is casual.
Absence due to a proven extinction
Particular case of absence due to a proven extinction less than a half century ago (older disappearances are treated as "no probable or definite").
No information
In the state of knowledge, we can not comment on the presence or absence in the current department. This is the default status when not comprised in one of the previous categories or whenever there is doubt.
French Version
