Regnorme

Regnorme
Tegning: Halvard
Tegning: Halvard
Videnskabelig klassifikation
DomæneEukaryota
RigeAnimalia (Dyr)
RækkeAnnelida (Ledorme)
KlasseOligochaeta
OrdenOpisthopora
UnderordenLumbricina
OverfamilieLumbricoidea
FamilieLumbricidae
Rafinesque-Schmaltz, 1815
Hjælp til læsning af taksobokse

Regnorme (Lumbricidae) er en familie i rækken ledorme. De er kendt for at være til gavn i haven, idet de forbedrer jordens kvalitet.

Regnorme har ingen egentlige øjne, men kan skelne mellem lys og mørke. De ånder gennem huden.

Parring

Hos kønsmodne dyr findes et opsvulmet parti på den forreste tredjedel af kroppen. Denne del kaldes bæltet eller sadelen (clitellum). Når regnorme parrer sig, anbringer de bugen mod hinanden og hovedet i hver sin retning. Sadelen udskiller da et slimet sekret, der omgiver dyrenes midterparti. I dette slimhylster glider sæden i et par render hen til hver af dyrenes sædgemmer. Parringen kan vare nogle timer. Senere dannes ægkokoner i sadelen og sæden fra sædgemmerne udgydes over æggene. Fra disse æg kryber ungerne færdigudviklede ud efter nogle uger.[1]

Jordforbedring

Regnormene giver god muldjord, da de omsætter en masse henfaldende organisk stof. Desuden ilter regnormenes gange jorden, så den bliver let og luftig. På den måde trives planter og mikroorganismer bedre, ligesom regnvandet bedre siver ned i jorden.[1]

Klassifikation

Arter

I Danmark findes der omkring 20 arter af regnorme.[2] Blandt andre:

Slægter

  • Allolobophora
  • Aporrectodea
    • Aporrectodea calignosa
    • Aporrectodea rosea
    • Aporrectodea trapezoides
    • Aporrectodea turgida
  • Bimastos
  • Dendrobaena
  • Dendrodrilus
  • Eisenia
  • Eiseniella
  • Eophila
  • Helodrilus
  • Octodrilus
  • Octolasion
  • Underfamilie: Lumbricinae
    • Lumbricus
      • Lumbricus castaneus
      • Lumbricus rubellus
      • Lumbricus terrestris (Stor regnorm)
  • Underfamilie: Diporodrilinae
    • Diporodrilus

Se også

Referencer

  1. ^ a b Hans Hvass (red.) Danmarks Dyreverden, bind 1, Hvirvelløse dyr, side 187. 2. udgave, Rosenkilde og Bagger 1978. ISBN 87-423-0076-2.
  2. ^ www.allearter.dk: Familien Lumbricidae Arkiveret 28. september 2015 hos Wayback Machine

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