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Zoomorphologie

, Volume 95, Issue 1, pp 41–84 | Cite as

A new group of interstitial worms, Lobatocerebridae nov. fam. (Annelida) and its significance for metazoan phylogeny

  • R. M. Rieger
Article

Summary

This is the first paper of a series dealing with the new interstitial, monotypic family Lobatocerebridae. The single genusLobatocerebrum is described as a turbellariomorph taxon in the annelid line of evolution. The male genital system, the protonephridial system, the body wall and the anus-hindgut system reveal the most important characteristics for the determination of its phylogenetic position. Although presently the group can not be clearly aligned with any of the classes within the Annelida, the new family is provisionally included into the Oligochaeta, until further, yet undescribed species of this group will reveal better the within-group characterconsistency. Because of the high degree of superficial similarities to the Turbellaria (acoelomate body cavity, complete ciliation, lack of signs of segmentation, special features of the foregut, arrangement of reproductive organs) this paper argues that the Lobatocerebridae may become an important example for trying to understand the origin and evolution of acoelomate flatworms from coelomate ancestors.

Keywords

Developmental Biology Genital System Reproductive Organ Body Wall Phylogenetic Position 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations Used in Figures

ad

adhesive organ

bc

basal granule cell

bcg

basal cell granules system

bm

basement membrane

br

brain

cm

circular muscle fibers

cmg

cyanophilous glands of male gonopore

co

commissure between lateral nerves

cu

cuticle

ep

epidermis

fg

frontal gland

hg

hindgut

i

intestine

il

intercellular lacunae filled with dense matrix

lc1

lobus caudalis major

lc2

lobus caudalis minor

1m

longitudinal muscle bands

ln

lateral nerve chords

lr

lobus rostralis

m

muscle fibers

m1

regular mucous gland

mc

male genital canal

me

mesenchymal cells

mg

male gonopore

mo

mouth opening

n

small nerve bundles

nc

neurosecretory cell

ng

neuroglia cell

np

neuropile

nu

nucleus

o

ovary

oe

oesophagus

pb

post-buccal ganglia

pc

post-cerebral ganglion

ph

pharynx

phg

pharyngeal glands

plm

longitudinal pharynx muscle

pr

protonephridium

rm

radial muscles on pharynx

sp

spermatozoa

sph0

sphincter system at mouth opening

sph1

first circular muscle band

sph2

second circular muscle band

sph3

U-shaped muscle band on pharynx

sph4

sphincter at oesophagus

sph5

anal sphincter

sr

seminal receptacle

t

testis

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© Springer-Verlag 1980

Authors and Affiliations

  • R. M. Rieger
    • 1
  1. 1.Department of ZoologyUniversity of North CarolinaChapel HillUSA

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