The state of the art of Chromadoridae (Nematoda, Chromadorida): a historical review, diagnoses and comments about valid and dubious genera and a list of valid species
Author
Venekey, Virag
Author
Gheller, Paula F.
Author
Kandratavicius, Noelia
Author
Cunha, Beatriz Pereira
Author
Vilas-Boas, Ana Carolina
Author
Fonseca, Gustavo
Author
Maria, Tatiana F.
text
Zootaxa
2019
2019-04-09
4578
1
1
67
journal article
27319
10.11646/zootaxa.4578.1.1
ab975e9d-43f8-4390-8a48-f44cd1019e5e
1175-5326
2637441
CE27CD48-70BB-4979-9C67-A1A2E1BAAFFD
Genus
Prochromadora
Filipjev, 1922
This genus was established with
P. orleji
(de
Man, 1880
)
as the
type
species (
Filipjev, 1922
) and it is unique within
Chromadorinae
in having homogenous cuticle without transversal rows of dots or lateral differentiation.
Filipjev (1930)
reviewed the genus and transferred three species from
Chromadora
to
Prochromadora
:
P. orleji
,
P. erythrophthalma
and
P. minor
.
These latter two species were regarded as
Chromadorina
in the review of
Wieser (1954)
, who also transferred
Chromadorita
and
Chromadora
species to
Prochromadora
[
P. magna
(
Schulz, 1935
)
and
P. exigua
(
Ditlevsen, 1928
)
, respectively]. In this review, a key based on the length of nematodes was also proposed, in which
P. magna
is distinguished from the other species based on its relatively large body length (
2- 2.5mm
).
Tarjan
et al.
(1991)
redescribed
P. orleji
and proposed a key for the nine species valid at that time. Based on this key, males of this genus can be easily separated in two groups based on the presence (
P. argentinensis
Pastor de
Ward, 1984
;
P. exigua
;
P. megodonta
Filipjev, 1922
;
P. orleji
;
P. spiltzbergensis
Gerlach, 1965
and
P. trisupplementa
Murphy, 1963
) and absence (
P. asupplementa
Hopper, 1961
and
P. bulbosa
Galtsova, 1976
) of precloacal supplements. When precloacal supplements are present they can range from 3 to 20.
P. helenae
was the most recent species described in this genus by
Tchesunov (2015)
and it can be included in the group of species without precloacal supplements.
Diagnosis
(modified from
Tchesunov 2014
): Homogeneous punctated cuticle without transversal rows of dots and without lateral differentiation. Amphideal fovea transverse slit-like, but not visible in several species. Single large dorsal tooth opposed by a ventrosublateral pit or at most by a small elevation of the buccal wall or small ventrosublateral teeth. Posterior pharyngeal bulb well developed. Precloacal supplements usually present in males. It is mainly marine genus, but
C. orleji
is also recorded in freshwater.
Number of valid species
: 10
Genus
Prochromadora
Filipjev, 1922
VALID SPECIES
1.
Prochromadora argentinensis
Pastor de
Ward, 1984
(Puerto Deseado,
Argentina
)
2.
Prochromadora asupplementa
Hopper, 1961
(
Alabama
,
USA
)
3.
Prochromadora bulbosa
Galtsova, 1976
(White Sea)
4.
Prochromadora exigua
(
Ditlevsen, 1928
)
Wieser, 1954
(
Greenland
)
Syn.
Chromadora exigua
Ditlevsen, 1928
5.
Prochromadora helenae
Tchesunov, 2015
(Mid-Atlantic Ridge)
6.
Prochromadora magna
(
Schulz, 1935
)
Wieser, 1954
(Mediterranean)
7.
Prochromadora megodonta
Filipjev, 1922
(Black Sea)
8.
Prochromadora orleji
(de
Man, 1880
)
Filipjev, 1922
(North Sea)
Syn.
Chromadora orleji
de
Man, 1880
9.
Prochromadora spitzbergensis
Gerlach, 1965
(
Svalbard
)
10.
Prochromadora trisupplementa
Murphy, 1963
(
Oregon
,
USA
)