Two new genera and five new species of Selachinematidae (Nematoda, Chromadorida) from the continental slope of New Zealand Author Leduc, Daniel text European Journal of Taxonomy 2013 2013-11-13 63 1 32 journal article 22236 10.5852/ejt.2013.63 71a3f4b4-3e53-486e-9cee-0195fbbfb8e8 2118-9773 3823012 BB33641C-6FAF-4D2E-93FB-C4951F7C058C Genus Gammanema Cobb, 1920 Type species Gammanema ferox Cobb, 1920 (junior synonym of Gammanema rapax (Ssaweljev, 1912)) . Diagnosis Cuticle without lateral differentiation, four slender cephalic setae; outer labia either papillose or setose. Amphideal fovea usually spiral, rarely loop-shaped.Anterior buccal cavity large, cup-shaped, surrounded by rhabdions with pointed projections at their posterior ends; posterior buccal cavity smaller, often with broad column-shaped rhabdions. Pharynx without anterior or posterior bulb. Pre-cloacal supplements present, usually cup-shaped, rarely setose or tubular. Short conical tail. Remarks Gammanema paramenzeli (Allgén, 1935) was considered doubtful by Gerlach (1964) , Trogolaimus uniformis Cobb, 1920 was transferred to Gammanema by Tchesunov & Okhlopkov (2006) and G. fennicum Gerlach, 1953 was re-established as a valid species by Okhlopkov (2002) . Table 2. Morphometrics (μm) of Cobbionema trigamma sp. nov. , Gammanema agglutinans sp. nov. , and Bendiella thalassa gen. et sp. nov. ― a = body length/maximum body diameter; abd = anal body diameter; b = body length/pharynx length; c = body length/tail length; cbd = corresponding body diameter; L = body length; n = number of specimens; V = vulva distance from anterior end of body; %V = V/total body length.

Species	Cobbionema trigamma sp. nov.			Gammanema agglutinans sp. nov.			Bendiella thalassa gen. et sp. nov.
Males		Female	Males		Females	Male		Females
Holotype	Paratype	Paratype	Holotype	Paratype	Paratypes	Holotype	Paratype	Paratypes
n	-	1	1	-	1	2	-	1	3
L	1305	600	566	696	544	763, 918	1118	1015	975-997
a	16	17	14	11	10	11,15	32	34	28-33
b	7	5	4	5	4	3,4	7	6	6
c	13	9	20*	12	13	13, 20	6	7	7*
Body diameter at level of cephalic setae	31	12	13	31	30	40, 47	16	16	17-19
Body diameter at level of amphids	50	25	26	35	36	41, 50	26	27	23-28
Length of cephalic setae	9-11	5-6	6-7	10	11	11, 19	1	1	1
Amphid height	14	10	6	7	7	4, 5	9	11	9-11
Amphid width	16	13	8	10	10	5	13	13	11-12
Amphid width/cbd (%)	28	52	31	29	28	10, 12	50	48	42-49
Amphid from anterior end	11	6	9	6	9	12, 13	12	16	15
Nerve ring from anterior end	88	54	53	60	54	91, 93	62	75	67-84
Nerve ring cbd	79	34	36	59	47	57, 69	34	30	29-31
Excretory pore from anterior end	120	66	68	-	-	-	84	105	87-96
Pharynx length	200	124	127	154	136	213, 220	153	171	165-172
Pharynx diameter at base	63	28	32	41	31	47, 51	25	21	20-23
Pharynx cbd at base	80	37	38	56	43	60, 65	35	31	30-35
Max. body diam.	83	36	41	64	52	60, 72	35	30	30-35
Spicule length	114	57	-	36	34	-	39	38	-
Gubernaculum length	27	17	-	19	19	-	20	20	-
Anal body diam.	46	23	27*	45	35	30, 39	27	26	23-27*
Tail length	101	65	29*	58	42	46, 58	201	140	124-138*
Tail length/abd	2.2	2.8	1.1*	1.3	1.2	1.5	7.0	5.4	4.6-6.0*
V	-	-	294	-	-	493, 578	-	-	472-486
%V	-	-	52	-	-	63, 65	-	-	47-50
Vulval body diam.	-	-	41	-	-	60, 72	-	-	30-35

*approximate values only since no anus was observed in female specimens Valid species G. anthostoma Okhlopkov, 2002 G. cancellatum Gerlach, 1955 G. curvata Gagarin & Klerman, 2007 G. conicauda Gerlach, 1953 G. fennicum Gerlach, 1953 G. kosswigi Gerlach, 1964 G. mediterraneum Vitiello, 1970 G. polydonta Murphy, 1965 G. rapax (Ssaweljev, 1912) G. smithi Murphy, 1964 G. tchesunovi Gagarin & Klerman, 2007 G. uniformis (Cobb, 1920)