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CYCLOPOIDA, BILLBERG, 1820 (order)
Anterior part of the body only a little bigger
than and less than twice the length of the abdomen.
First antenna short, with 6-17 segments, never
reaching the abdomen. Fifth leg not asymmetrical.
With two brood sacks.

 

CYCLOPIDAE, BILLBERG, 1820 (family)

EUCYCLOPINAE, KIEFER, 1927
Last segment of fifth leg of female with 3
appendages. Caudal branches often with bristles.
Feed by seizing food when colliding with it.
Feed on bacteria, algae and zooplankton.

EUCYCLOPS, CLAUS 1893.

Caudal branches usually very divergent and 4-5 times
as long as wide. Lateral spine near the end of
the caudal branchFifth leg articulated with the
fifth thoracic segment, angular in outline.
First antenna with 6-12 segments. Outer margin
of caudal branches with small distinct saw-like spines.
Both nauplii and copepodite feed on algae (diatoms
and filamentous green- and bluegree algae).Littoral.

 

124 a. One species. Size female 800-1450 μm. Egg sacs rather divergent, compact and pointed at the end. Littoral and tychoplanktonic. Also in brackish water. Common.
(Figures 124a¹, 124a²)
- Laguna de Bay(nauplii and female), Paoay Lake,
  La Mesa Dam,  Taal Lake, Naujan, Lake Lanao.
   Eucyclops serrulatus, (FISHER, 1851)
            [1978a+b, 1980, 1984, 1986a, 2001, 2008b]

E.  serrulatus Female from Laguna de Bay

 

TROPOCYCLOPS, KIEFER, 1927
Fifth leg articulated with the fifth thoracic segment,
angular in outline. First antenna with 6-12 segments.
Outer margin of caudal branches without such spines,
and only diverging slightly, 2 1/2 times as long as
wide. Littoral.

125 a. One species. Egg sacs closely opposed to abdomen.
Lateral spine in the middle of caudal branch.
A swimming rather than creeping form, swims on its
back. Usually size of females 680-750 μm.
In ponds and littoral zone in lakes, tychoplanktonic
and planktonic (form pelagica). Rare.
(Figures 125a¹, 125a²)
- Laguna de Bay (female), La Mesa Dam, Lake Lanao, Paoay Lake.
   Tropocyclops prasinus (FISHER, 1860)
   (syn. Eucyclops prasinus)
             [1978a+b, 1980, 1984, 1986a, 2008b]

T.  prasinus Female from Laguna de Bay. Preserved.

PARACYCLOPS, CLAUS, 1893
Fifth leg articulated with the fifth thoracic segment,
angular in outline. First antennawith 6-12 segments.
Anterior part of body clearly flattened dorso­ventrally.
First antenna very short with 8 segments (6-11 worldwide),
reaching only to the middle of the cephalothorax.
Caudal branch long and thin, 5-6 times as long as wide,
dor­sally with transverse row of small spines. Littoral.

 

126 a. One species. Egg sacs closely opposed to abdomen, with few
large eggs. Adaptive species, eurytherm 13.5-39^o Celsius in
 alkaline water. Size female 860-900 μm., Benthic in lakes
and rivers. Rare.
- Laguna de Bay (littoral, adult), Los Baños, Paoay Lake.
   Paracyclops fimbriatus, (FISHER, 1853)
             [1978a+b, 1980, 1986a, 2008b]

ECTOCYCLOPS, BRADY, 1904
Fifth leg form a very short and wide plate with­out
articulation with the fifth (posterior) tho­racic segment.
First antenna with 9-10 segments. Caudal branches short
and thick with several transverse rows of small spines.
More or less littoral.

127 a. One species. Egg sacs closely pressed to abdomen. Size of female 900-1000 μm. Commen.
- Laguna de Bay (adult), Taal Lake, Naujan, Lake Lanao, Paoay Lake.
   Ectocyclops phaleratus, (KOCK, 1838)
             [1978a+b, 1980, 1984, 1986a, 2008a]

E. phaleratus from Laguna de Bay

 To 128a