Gastrocotyline Parasites of Indian Clupeoids — Unnithan 
215 
6. The relative size of oral pouches (mean 
diagonal from -\/l X w ) ancJ pharynx in the 
genotype is 50—77%, the pharynx as usual 
being ovoid and larger than the ovoid oral 
pouches. But in E. micro pharyngella, while the 
oral pouches are nearly round the ovoid 
pharynx is minute, the former 130% of the 
latter. Hence this most obvious specific char- 
acter is indicated in the name. 
In view of these important characters I agree 
with George (1961) in his creation of En- 
graulicola, with E. forcepopenis as the type. 
The above description was written before the 
paper by K. C. George was available to me, but 
we had previously agreed on the nomencla- 
ture of his material (described some years 
earlier than mine) from the same geographical 
region (South Malabar coast). 
Engraulixenus malabaricus gen. et sp. nov. 
Figs. 7-11 
Several specimens of this new species of en- 
graulid parasite were obtained from the gills of 
T hr is socles malabaricus (Bloch) examined at 
Trivandrum on July 26, 1955. Four fishes were 
examined and all were infected by the new 
parasite as well as by a large number of two 
different species of Mazocraeidae. Out of the 
52 Monogenoidea obtained, 8 specimens be- 
longed to the present species. 
This worm is foot-shaped, with a distinct 
heel and a long slender forebody, the total 
length being 1.71-2.43 mm and the maximum 
width 0.45-0.5 mm (Fig. 7). 
Mouth subterminal, without especially glan- 
dular or muscular lips ; oral pouches spherical, 
24-28 p in diameter ; pharynx median, very 
large, elongated ovoid, 64 X 36 p-80 X 38 p; 
oral pouches not more than 40% of pharynx 
(by mean diagonals) ; oesophagus narrow, 
0.13-0.19 mm long, bifurcating into the in- 
testinal crura behind the male genital pore; 
crura exceptional, with 2-3 cross connections 
bridging across the median line and without 
much outer branching, the dilated ends (un- 
branched in posterior third) extending to dif- 
ferent levels. At the anterior region of the long 
clamp row, the crus of that side has a few wider 
lateral branches, forming the base of what is 
probably a metahaptoral wing. An oblique con- 
Figs. 7—11. Engraulixenus malabaricus gen. et sp. 
nov. 7, Complete worm, ventral view ; 8, clamp of the 
long row, dorsal view; 9, proximal anchors; 10, distal 
anchors; 11, penis with the corona of hooks and for- 
cepiform process. 
nection also occurs between the distal ends of 
the crura, behind the testes zone, in most of the 
specimens (Fig. 7). 
The haptor occupies about 50% of the total 
length; a fleshy flange adherent to the body 
(yet with an increasing tendency to diverge 
from it) forms the wing referred to above. 
The long clamp row has 42-49 clamps, each 
32 X 48 p-32 X 66 p; the short row has two 
nearly sessile clamps 24 X 28 [h and 28 X 
36 p ; lappet 64 X 28 p, armed with two pairs 
of anchors. The anterior pair (Fig. 9), 32 p 
long, have a shape different from that in Gas- 
