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A new genus of hermaphroditic freshwater heteronemertean (Nemertinea)

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Summary

Diagnosis of Apatronemertes nov. gen. Hermaphroditic freshwater lineid heteronemerteans with no eyes, frontal organ or caudal cirrus; outer longitudinal muscle layer mingled with dermal zone, but loosely developed into outer and inner layers separated by dermis; body-wall with outer longitudinal muscle layer externally bounded by thin outer circular muscle zone which extends precerebrally; cephalic glands well developed, ventrally extending beneath the brain; proboscis with outer circular and inner longitudinal muscle layers and two fibre crosses, one more obvious than the other; rhynchocoel three-quarters of body length and rhynchocoel musculature not interwoven with body wall muscles; dorsal cerebral ganglia with posterior fibrous bifurcation, the cerebral organs being attached to the more ventral branch; nervous system without neurochords; excretory system a complex arrangement of ducts and cells, discharching into the gut via specialised cells; blood system extensive, with a postcerebral vascular plexus intimately associated with the excretory system.

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Abbreviations

ate:

supra-anal transverse connective

bc:

buccal cavity

be:

buccal epithelium

cc:

cerebral canal

cg:

cephalic gland lobules

cm:

principal body wall circular muscle layer

cmp:

circular muscle layer of proboscis

co:

cerebral organ

cs:

cephalic slit

etc:

cephalic transverse connective

db:

dorsal fibrous bifurcation of brain

ed:

excretory duct

egv:

extraganglionic vessel

ga:

gastrodermis

gdl:

ganglionic layer of dorsal cerebral lobe

i:

intestine

iv:

inner cephalic vessel

ll:

postcerebrallateral lacuna

lmp:

longitudinal muscle layer of proboscis

lu:

lumen of the gut

m:

mouth

mc:

muscle cross

mv:

mid-dorsal blood vessel

ns:

neuralsheath

nv:

nephridial vascular plexus

o:

ovum

ov:

outer cephalic vessel

pen:

proboscis endothelium

pep:

proboscis epithelium

pp:

proboscis pore

r:

rhynchocoel

rd:

rhynchodaeum

rdm:

rhynchodaeal musculature

rv:

rhynchocoelic villus

st:

stomach

ul:

U-shaped lacuna

vc:

ventral cerebral commissure

vec:

vacuolate cells

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Authors and Affiliations

  1. Institut für Zoologie der Universität, 1 Mettmanner Str. 16, D-4000, Düsseldorf, Germany

    Michael Wilfert

  2. Department of Biology Liverpool Polytechnic, Byrom Street, L3 3AF, Liverpool, England

    Ray Gibson

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  1. Michael Wilfert
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  2. Ray Gibson
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Wilfert, M., Gibson, R. A new genus of hermaphroditic freshwater heteronemertean (Nemertinea). Z. Morph. Tiere 79, 87–112 (1974). https://doi.org/10.1007/BF00298777

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  • DOI: https://doi.org/10.1007/BF00298777

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