Acanthobothrium lentiginosum
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Vardo-Zalik2011Zootaxa2838, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Vardo-Zalik2011Zootaxa2838">{{Citation |
Ordo: Tetraphyllidea
Familia: Onchobothriidae
Genus: Acanthobothrium
Name
Acanthobothrium lentiginosum Garman, 1880 – Wikispecies link – Pensoft Profile
- Acanthobothrium lentiginosum Vardo-Zalik, Anne M., 2011, Zootaxa 2838: 48-51.
Materials Examined
Type Locality: Gulf of Mexico at 26 16.11 ’N, 97 8.05 ’W at 9 fathoms 15.x. 94, coll. R. A. Campbell. Site of Infection: spiral intestine. Prevalence:1 of 1 individual examined.
Etymology
Etymology: This species is named after its host, Rhinobatos lentiginosus.
Description
Description: Based upon measurements of 5 whole mounted specimens and 2 with SEM. Small worms 2–3.1 mm (3, n= 5) long composed of 5–7 (6, n= 5) segments; strobila acraspedote, euapolytic. Scolex proper 288–474 (347, n= 5) long by 168–304 (227, n= 5) wide, composed of 4 triloculate bothridia. Bothridia, 272–474 (347, n= 8) long by 85–140 (111, n= 8) wide; mean (BL: BW) 2.7: 1. Each of 4 bothridia free at posterior end, acuminate, covered with spinitriches over proximal surfaces and divided into three loculi by muscular septa. Anterior loculus 100– 235 (168, n= 11) long, middle loculus 45–90 (58, n= 11) long, posterior loculus 45–95 (65, n= 11) long; (A: M: P) 1: 0.35: 0.39. Apical pad 30–50 (40, n= 6) long by 65–120 (88, n= 6) wide, bearing a single accessory sucker, 10–20 (14, n= 8) long by 20–40 (29, n= 8) wide. Cephalic peduncle 288–456 (373, n= 5) long by 52–80 (65, n= 5) wide covered with spinitriches; (BL: CPL) 1: 1.2–1.6. Hook dimensions: Hooks of similar shape; handle and prongs about equal in length. Lateral hook (n= 6): A = 35–40 (38); B= 60–100 (82); C= 80–110 (88); D= 90–135 (114); E= 110–150 (125); W= 30–40 (38). Medial hook (n= 6): A’= 30–40 (33); B’= 75–110 (87); C’= 65–100 (88); D’= 100–140 (118); E’= 95–140 (123); W’= 40–60 (45). (THL: BL) 1: 2.7 to 1: 2.8. Strobila: Immature segments, 2–6 (4, n= 5) per worm wider than long becoming longer than wide with maturity. Mature segments, 350–570 (483, n= 3) long by 135–200 (165, n= 3) wide, 1 (1, n= 4) per worm. Genital pore opening on lateral margin, 59–69 % (63, n= 3) from posterior end of the segment; genital atrium shallow. Cirrus sac near middle of segment, subspherical in mature segments, 60–164 (142, n= 5) long by 50–108 (85, n= 5) wide, containing coiled cirrus; cirrus armed with microtriches. Testes arranged in two, single layered columns extending between ovarian lobes near ovarian isthmus to near anterior extremity of segment. Testes 22–29 (26, n= 3) in number, 5–7 (6, n= 3) preporal, 10–13 (12, n= 3) aporal, 4–6 (5, n= 3) postporal; subspherical 30–50 (37, n= 10) long by 25–40 (33, n= 10) wide. Vas deferens anteromedian, sinuous, enters cirrus sac at adnate pole. Ovary posterior, inverted -A shaped in frontal view (Fig. 12), 192–418 (272, n= 3) long, by 104–152 (132, n= 3) wide, bilobed in cross-section, lobes approximately equal in length, extending c. 75 % distance to cirrus sac from posterior end of segment; ovarian isthmus well posterior. Mehlis’ gland and ootype small, elongated, c. 15–27 long by 10–23 wide, located immediately posterior to ovarian isthmus. Vagina thick-walled, ascends along midline as sinuous tube from ootype to cirrus sac, then laterally along anterior border of cirrus sac to enter genital atrium; seminal receptacle, c. 15 in diameter, at level of ovarian isthmus; vaginal sphincter absent. Vitellarium in 2 lateral follicular columns, each column 1–2 follicles deep, extending from just posterior to ovarian isthmus to level of the most anterior testes; interrupted by cirrus sac and vagina on poral side. Uterus median, tubular, extending from ootype to near anterior extremity of segment. Excretory ducts lateral.
Discussion
Remarks:Acanthobothrium lentiginosum from R. lentiginosus is a category 1 species (SFFS) and possesses ovarian lobes of approximately equal length that reach about 75 % of the distance from the posterior end of the segment to the level of the cirrus sac (Goshroy & Caira 2001). This is the first species of Acanthobothrium described from a guitarfish (Rhinobatidae) in the Atlantic Ocean and only the fifth species of Acanthobothrium reported from the genus Rhinobatos worldwide. Fyler and Caira (2004) reported finding Acanthobothrium in two species of guitarfish from Senegal but did not describe them. The Atlantic guitarfish, R. lentiginosus, is found along the east coast of North America and the Gulf of Mexico in coastal waters and in Cuba (Robins & Ray 1986; Froese & Pauly 2010). Other species of Acanthobothrium described from rhinobatids are: Acanthobothrium olseni Dailey & Mudrey, 1968, Acanthobothrium rhinobati Alexander, 1953 and Acanthobothrium robustum Alexander, 1953 all from Rhinobatos productus (Ayres); Acanthobothrium satyanarayanaroi Sarada, Lakshmi & Rao, 1993 in Glaucostegus granulatus (Cuvier); and Acanthobothrium southwelli Subhapradha, 1955 in Rhinobatos schlegelii Müller & Henle.Acanthobothrium lentiginosum can be differentiated from all of these species using the original descriptions and categorical system of Ghoshroy & Caira (2001) as follows: A. olseni belongs to category 2 in having an asymmetrical ovary, and A. lentiginosum possesses fewer testes (22–29 vs. 26–39) and a shorter cephalic peduncle (288–456 vs. 667); A. rhinobati fits categories 9 (5) due to the variable number of segments and a symmetrical ovary and is different from A. lentiginosum by larger overall size (32mm. vs. 2–3 mm) and greater numbers of segments (50 vs. 5–7) and testes (51–62 vs. 22–29); A. robustum is designated a category 4 species by possessing a symmetrical ovary, and differs in possession of 2 accessory suckers per bothridium and an accessory spur on each outer hook prong; A. satyanarayanaroi is a much larger worm (9–15 cm vs. 2–3 mm) with many segments and testes (80–90 vs. 22–29); and finally, A. lentiginosum differs from A. southwelli in the absence of postovarian testes, total number of testes (22–29 vs. 34) and number of postporal testes (4–6 vs. 13).
Taxon Treatment
- Vardo-Zalik, Anne M.; Campbell, Ronald A.; 2011: Five new species of Acanthobothrium van Beneden, 1849 (Cestoda: Tetraphyllidea) in elasmobranchs from the northwest Atlantic and Gulf of Mexico with first records from smooth-hound sharks and guitarfish, Zootaxa 2838: 48-51. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
