Genus Retrovescus Blakemore, 1998

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• Retrovescus Blakemore, R.J. 1998. Retrovescus, a new genus of opisthogastric earthworm from Tasmania. Invertebrate Taxonomy 12: 655-665 [655-656].

  Type species:

   Retrovescus plomleyi Blakemore, 1998 by original designation.

  Secondary source:

   Jamieson, B.G.M. 2000. Native Earthworms of Australia (Megascolecidae, Megascolecinae). Enfield, New Hampshire, USA : Science Publishers, Inc. [CD ROM] 2506 pp. [Date published 12 December 2000] [1071] (emendation of the generic diagnosis).

Distribution

States

Tasmania

IBRA and IMCRA regions

IBRA

Tas: King (KIN), Tasmanian Northern Slopes (TNS)

Diagnosis

Setae perichaetine, 22-36 per segment. Dorsal pores present. Combined male pores and pores of tubuloracemose prostates paired on 18. Oesophageal gizzard weak in 5 and moniliform intestinal gizzards in 20-24, 25, 26 (i.e., over 5-7 segments) often with some muscular modification of 19 also. Holandric. Extramural calciferous glands absent. Nephridia avesiculate meroic, two sets of tubules per side in some segments (sometimes one or three per side), not tufted anteriorly. Last hearts in 12. Spermathecae two pairs in 8 and 9, spermathecal diverticulum clavate, often longer than ampulla. Intestinal origin 17, typhlosole absent, intestinal caeca absent. Long penial setae present.

Diagnosis References

Blakemore, R.J. 2000. Tasmanian earthworms. Published electronically. 575 pp. [531]

History of changes