Longicyatholaimus, Micoletzky, 1924

Balsamo, Maria, 2017, A re-description of Longicyatholaimus maldivarum Gerlach, 1964 (Nematoda, Cyatholamidae) with an emended identification key of the genus, Zootaxa 4323 (1), pp. 96-108 : 105

Key to species of the genus Longicyatholaimus

The present identification key is an updated and modified version of that proposed by Hopper (1972).

1. Punctuations in lateral regions arranged in longitudinal rows.................................................. 2

- Punctuations in lateral regions not arranged in longitudinal rows............................................... 4

2. Body 2.6 mm long; amphideal fovea with five turns...................................... L. trichurus ( Cobb, 1898)

- Body <than 2.1 mm long; amphideal fovea with 3.5–5 turns.................................................. 3

3. Lateral fields with three rows of longitudinal punctuations.............................. L. maldivarum Gerlach, 1964

- Lateral fields with four rows of longitudinal punctuations..................................... L. minor ( Cobb, 1898)

4. Amphideal fovea with three turns..................................................... L. continus Filipjev, 1946

- Amphideal fovea with ± four turns....................................................................... 5

5. Tail <700 µm in length (335–645 µm)..................................................................... 6

- Tail> 700 µm in length (703–992 µm)..................................................................... 7

6. Cephalic setae length equal to ⅓ of the head width; labial setae length equal to ¼ of cephalic setae................................................................................................ L. longicaudatus (de Man, 1876)

- Cephalic setae length equal to ½ of the head width; labial setae length equal to ⅓–½ of cephalic setae................................................................................................... L. marilynae Hopper, 1972

7. Distal extremity of spicules without large spines (at most with small denticles).................................... 8

- Distal extremity of spicules with 3–13 large spines.......................................................... 9

8. Amphideal fovea> than one head diameter from anterior extremity, amphideal fovea with four turns; single longitudinal row of pores in the cervical region....................................................... L. cervoides Vitiello, 1970

- Amphideal fovea <than one head diameter from anterior extremity, amphideal fovea with five turns; 2–3 irregular longitudinal rows of pores in the cervical region................................................... L. falcatus Vitiello, 1970

9. Distal extremity of spicules with 3–4 large spines, proximal end of spicules directed ventrally.. L. trichocauda Vitiello, 1970

- Distal extremity of spicules with 12 or more large spines, proximal end of spicules not directed ventrally................................................................................................ L. egregius Hopper, 1972