Macrourimegatrema brayi n. gen., n. sp. (Digenea: Opecoelidae) from four species of deep-sea macrourid fishes from the Gulf of Mexico and Caribbean Sea, with a list of endohelminths reported from species of Bathygadus and Gadomus (Macrouridae)
Author
Blend, Charles K.
Department of Biology, Gordon College, 255 Grapevine Road, Wenham, Massachusetts 01984, U. S. A., email: cblend @ gordon. edu Laboratory of Parasitology, Department of Wildlife and Fisheries Sciences, College of Agriculture & Life Sciences, Texas A & M University, 2258 TAMU, College Station, Texas 77843 - 2258, U. S. A., email: ndronen @ tamu. edu
Author
Dronen, Norman O.
Author
Armstrong, Howard W.
text
Zootaxa
2004
2004-07-14
566
1
1
18
https://biotaxa.org/Zootaxa/article/view/zootaxa.566.1.1
journal article
4803
10.11646/zootaxa.566.1.1
a026e0b2-ad8a-45ec-ae17-b3494bd22e28
11755334
5259050
7F5BF7F4-1284-4CD9-BAE3-D195D98F3C57
Macrourimegatrema brayi
n. sp.
(
Figs. 1–3
)
Synonyms:
Genus novum B, species nova #1 of
Armstrong (1974)
;
Opecoelidae
gen. n.
B, sp. n. #1 of
Bray (1995
, p. 182, 184); Genus novum A, species nova of
Blend (1996)
;
Opecoelidae
indet. of
Klimpel et al. (2001
, p. 63, 64).
Typehost:
Bathygadus macrops
Goode & Bean
,
Macrouridae
,
Gadiformes
, bullseye grenadier, TCWC symbiotype 10608.02.
Typelocality:
Northeastern Gulf
of
Mexico
,
28°53'N
,
86°57'W
, depth =
655 m
,
29 June 1971
.
FIGURES 1–3.
Macrourimegatrema brayi
n. gen., n. sp.
from
Bathygadus favosus
,
Bathygadus macrops
,
Bathygadus melanobranchus
and
Gadomus arcuatus
. 1. Composite drawing of adult, ventral view. 2. Composite drawing of the male terminal genitalia, ventral view. 3. Composite drawing of oötype region, ventral view. Abbreviations: C, cecum; E, egg; G, genital pore; J, ejaculatory duct; L, Laurer’s canal; M, metraterm; MG, Mehlis’ gland; O, ovary; R, seminal receptacle; S, seminal vesicle; T, testis; U, uterus; V, vitelline reservoir and VD, vitelline ducts. Scalebars: 1, 900 µm; 2, 300 µm; 3, 375 µm.
Other hosts:
Bathygadus favosus
Goode & Bean, TCWC
symbiotype 6303.25;
Bathygadus melanobranchus
Vaillant
, Vaillant’s grenadier, TCWC symbiotype 7038.03;
Gadomus arcuatus
(Goode & Bean)
, doublethread grenadier, TCWC symbiotype 8801.02,
Macrouridae
,
Gadiformes
.
Other localities:
Northeastern, northcentral, and western Gulf of Mexico,
23°17'N
,
97°02'W
, depth =
1,006
–1,079
m
,
12 July 1976
;
27°28'N
,
85°13'W
, depth =
728 m
,
22 June 1971
;
27°38'N
,
85°15'W
, depth =
637 m
,
23 June 1971
;
28°02'N
,
85°37'W
, depth =
583 m
,
24 June 1971
;
28°15'N
,
86°06'W
, depth =
586 m
,
26 June 1971
;
28°17'N
,
86°21'W
, depth =
655 m
,
26 June 1971
;
28°22'N
,
86°31'W
, depth =
710 m
,
26 June 1971
;
28°29'N
,
86°58'W
, depth =
783–841 m
,
13 May 1985
;
29°12'
29°15'N
, 87°36'
87°45'W
, depth =
709–793 m
,
01 July 1999
;
30°11'N
,
88°45'W
, depth =
13 m
,
12 June 1971
(host caught in deeper water but expected to have been snagged/left in trawl and collected at this shallower station);
Caribbean Sea off
Panama
,
9°05'N
,
81°18'W
, depth =
591 m
,
29 October 1970
;
Caribbean Sea off
Colombia
,
9°32'N
,
76°38'W
, depth =
1,454 m
,
03 November 1970
.
Site:
Pyloric cecum; intestine.
Deposited specimens:
BMNH
holotype
2004.3.18.95
,
BMNH
paratypes
2004.3.18.67–94,
BMNH
vouchers 2004. 3.18.5–66,
USNPC
paratypes
094587.00 094589.00,
USNPC
vouchers 094590.00094593.00,
HWML
vouchers 4568445693,
CNHE
vouchers 4939–4940.
Prevalence:
B
.
macrops
11% (33/303);
B
.
favosus
19% (4/21);
B
.
melanobranchus
16% (5/31);
G
.
arcuatus
40% (4/10).
Intensity:
B
.
macrops
range 1–88;
B
.
favosus
range 1–6;
B
.
melanobranchus
range 1– 2;
G
.
arcuatus
range 1–2.
Mean intensity:
B
.
macrops
4.2 (138/33);
B
.
favosus
2.8 (11/4);
B
.
melanobranchus
1.2 (6/5);
G
.
arcuatus
2.5 (10/4).
Relative density/abundance:
B
.
macrops
0.5 (138/303);
B
.
favosus
0.5 (11/21);
B
.
melanobranchus
0.2 (6/31);
G
.
arcuatus
1 (10/10).
Etymology:
The generic designation in part comes from the family of fish parasitized by this digenean (macrourids) and the Greek “mega,” referring to the large size of this parasite, and “trema” for trematode. The species designation is for Dr. Rodney A. Bray, Department of Zoology, BMNH in recognition of his longstanding contributions to our knowledge of the helminths of deepsea fishes.
Description.
Measurements and proportions are given in
Table 2
. With the characteristics of the genus. Body large, elongate, narrow, flattened dorsoventrally. Forebody short, pyriform to slightly attenuate. Hindbody slightly to deeply crenulate, occasionally ruffled, elongate with nearly parallel sides; posterior extremity rounded to lanceolate; separated from forebody by constriction. Tegument smooth. Preoral lobe absent. Oral sucker funnelshaped, terminal. Acetabulum slightly protuberant, sometimes bordered by puckered margin, subspherical, wider than long, located close to anterior extremity. Prepharynx short. Pharynx muscular, oval. Esophagus long, thickwalled. Intestinal bifurcation at level of or immediately anterior to acetabulum. Ceca narrow, thickwalled with darkstaining cells, terminating blindly a short distance from posterior extremity.
Testes 2, smooth to slightly lobed, oval to subspherical, tandem, median, contiguous to short distance apart, just postequatorial in middle third of body, intercecal. Cirrus sac thinwalled, clavate to commashaped, extending short distance posterior to acetabulum. Seminal vesicle winding and tubular; basal portion composed of a large chamberlike region the anterior extreme of which is folded back on itself posteriorly reaching approximately halfway to posterior end of cirrus sac, then recurving anteriorly forming 2 adjacent small dilations, the most anterior of which narrows forming a short canal that proceeds anteriorly to form clubshaped spermfilled ejaculatory duct; small darkstaining cells surrounding distal end of ejaculatory duct. Pars prostatica absent or indistinct; prostate gland cells present. Genital pore barely submedian, bifurcal or just prebifurcal, immediately anterior to or at anterior margin of acetabulum in angle formed by esophagus and left cecum.
Ovary smooth to slightly indented, subspherical to transversely elongate, median, equatorial, immediately pretesticular and far removed from acetabulum and cirrus sac. Seminal receptacle canalicular, ellipsoid to almost barbellshaped, extending laterally, filling most of intercecal region of body just anterodorsal to ovary. Vitelline reservoir large, median to submedian, dorsosinistral and anterior to ovary, ventral to sinistral portion of seminal receptacle, with 2 pairs of preovarian vitelline ducts running laterally from reservoir. Laurer’s canal extensive, very convoluted, surrounded by darkstaining cells throughout, anterosinistral to vitelline reservoir and on opposite side of midline from majority of seminal receptacle, opening some distance anterior to level of oötype on dorsal surface just dextral to left cecum. Oviduct arising from anterosinistral margin of ovary, looping posteriorly over anterodextral margin of ovary, turning anteriorly and joining Laurer’s canal and vitelline reservoir before leading into median oötype. Uterus coiled, preovarian, extending in narrow intercecal band from ovary anterior to acetabulum where distal loop extends dorsolateral to anterior end of cirrus sac. Muscular metraterm present and surrounded by small darkstaining cells. Vitellaria follicular, circumcecal, extending laterally from at or very near level of posterior margin of acetabulum to posterior extremity, confluent in posttesticular region, lateral to testes and ovary, and present in intertesticular region, between anterior testis and ovary, and lightly in immediate preovarian space passing over uterus. Some specimens lacking vitelline follicles directly lateral to gonads. Eggs smooth, oval, yellow, nonfilamented, operculate.
Excretory vesicle tubular passing between testes, sinistral to posterior testis and dextral to anterior testis, terminating at or near level of ovary. Excretory pore subterminal.