﻿JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  Vol. 
  12 
  July 
  19, 
  1922 
  No. 
  13 
  

  

  ZOOLOGY.— 
  Greeffiella 
  (Trichoderma 
  Greeff, 
  1869 
  ; 
  not 
  Trichoderma 
  

   Steph. 
  1835). 
  Contributions 
  to 
  a 
  Science 
  of 
  Nematology, 
  XII. 
  

   N. 
  A. 
  Cobb, 
  United 
  States 
  Department 
  of 
  Agriculture. 
  

  

  In 
  1869, 
  Greeff 
  described 
  an 
  externally 
  peculiar 
  and 
  very 
  interesting 
  

   small 
  animal 
  form 
  under 
  the 
  name 
  Trichoderma. 
  Though 
  it 
  proves 
  

   in 
  the 
  end 
  to 
  be 
  internally 
  a 
  typical 
  nema, 
  it 
  is 
  only 
  after 
  many 
  years 
  

   that 
  the 
  fact 
  becomes 
  fully 
  established. 
  The 
  very 
  small 
  size 
  of 
  the 
  

   species 
  and 
  the 
  fact 
  that 
  the 
  setose 
  cuticle 
  makes 
  it 
  difficult 
  to 
  examine 
  

   the 
  internal 
  organs, 
  taken 
  together, 
  have 
  delayed 
  a 
  fuller 
  understand- 
  

   ing 
  of 
  the 
  internal 
  anatomy. 
  

  

  Opportunity 
  has 
  occurred 
  to 
  reexamine 
  a 
  species 
  of 
  this 
  genus 
  in 
  a 
  

   living 
  condition, 
  and 
  the 
  results 
  are 
  presented 
  herewith. 
  They 
  serve 
  

   to 
  establish 
  the 
  view 
  that 
  the 
  genus 
  comprises 
  typical 
  nemas, 
  in 
  no 
  

   sense 
  transition 
  forms; 
  the 
  genus 
  presents 
  striking 
  relationships 
  to 
  the 
  

   genus 
  Desmoscolex, 
  another 
  typical 
  nema 
  genus 
  whose 
  affmities 
  also 
  

   have 
  been 
  long 
  obscured 
  in 
  much 
  the 
  same 
  way, 
  but 
  finally 
  cleared 
  up. 
  

  

  The 
  name 
  Trichoderma 
  being 
  preempted, 
  it 
  is 
  proposed 
  to 
  commem- 
  

   orate 
  Greeff's 
  original 
  discovery 
  by 
  renaming 
  the 
  genus 
  after 
  him, 
  — 
  

   Greeffiella. 
  G. 
  oxycaudata 
  (Greeff) 
  is 
  retained 
  as 
  the 
  type 
  species. 
  

  

  Greeffiella, 
  nom. 
  nov. 
  

  

  Trichoderma 
  Greeff, 
  Arch. 
  f. 
  Naturg., 
  Berlin, 
  v. 
  3.5, 
  bd. 
  1. 
  1S69. 
  Not 
  

   Trichoderma 
  Steph., 
  1835, 
  or 
  Swains., 
  1839. 
  

  

  1:1. 
  _J2:4 
  13^ 
  56. 
  J 
  Z2^ 
  . 
  „ 
  oi 
  

  

  Greeffiella 
  dasyura 
  n.sp. 
  3.4 
  9.6/ 
  13. 
  15. 
  9.8 
  "•^^•" 
  The 
  thin 
  lay- 
  

  

  ers 
  of 
  the 
  transparent, 
  colorless, 
  hairy 
  cuticle 
  are 
  traversed 
  by 
  about 
  fifty- 
  

   six 
  plain 
  transverse 
  annules, 
  easy 
  of 
  resolution, 
  which 
  are 
  not 
  materially 
  

   altered 
  on 
  the 
  lateral 
  fields. 
  The 
  number 
  of 
  annules 
  corresponds 
  with 
  the 
  

   number 
  of 
  encircling 
  rows 
  of 
  somatic 
  setae. 
  While 
  there 
  are 
  no 
  wings 
  opposite 
  

   the 
  lateral 
  fields, 
  wing 
  spaces 
  are 
  faintly 
  indicated 
  by 
  a 
  slight 
  spareness, 
  or 
  

   absence, 
  of 
  setae 
  near 
  the 
  lateral 
  lines 
  ; 
  this 
  however 
  is 
  a 
  faint 
  feature 
  extending 
  

   only 
  from 
  the 
  neck 
  to 
  the 
  anus, 
  and 
  is 
  perhaps 
  more 
  pronounced 
  on 
  the 
  fe- 
  

   male 
  than 
  on 
  the 
  male. 
  The 
  contour 
  of 
  the 
  body 
  is 
  crenate, 
  especially 
  to- 
  

   ward 
  the 
  head. 
  There 
  appear 
  to 
  be 
  toward 
  thirty 
  small 
  unequal 
  cephalic 
  

   setae 
  on 
  the 
  front 
  of 
  the 
  head, 
  disposed, 
  apparently, 
  in 
  two 
  closely 
  approxi- 
  

   mated 
  circlets. 
  These 
  setae 
  average 
  to 
  be 
  about 
  as 
  long 
  as 
  the 
  head 
  is 
  wide 
  

  

  