Gyrodactylus anaspidus, Vianna & Boeger, 2019

Vianna, Rogério T. & Boeger, Walter A., 2019, Neotropical Monogenoidea. 60. Two new species of Gyrodactylus (Monogenoidea: Gyrodactylidae) from the armored-catfish, Pareiorhaphis parmula Pereira (Loricariidae) and from the cascarudo, Callichthys callichthys (Linnaeus) (Callichthyidae) from Brazil, Zootaxa 4551 (1), pp. 87-93 : 88-90

publication ID

https://doi.org/ 10.11646/zootaxa.4551.1.6

publication LSID

lsid:zoobank.org:pub:C6B6F35C-BF8A-4898-A8FB-FD3223DAE57F

DOI

https://doi.org/10.5281/zenodo.5941577

persistent identifier

https://treatment.plazi.org/id/2A137A42-A53F-483F-A23D-3E46DFA4DCE8

taxon LSID

lsid:zoobank.org:act:2A137A42-A53F-483F-A23D-3E46DFA4DCE8

treatment provided by

Plazi

scientific name

Gyrodactylus anaspidus
status

sp. nov.

Gyrodactylus anaspidus View in CoL n. sp.

( Figs. 1–5 View FIGURES 1–5 )

Type host: Pareiorhaphis parmula Pereira, 2005 (Loricariidae) .

Site of infection. Body surface.

Type-locality. Rio dos Patos (25 o 50, 646′S, 49 o 43, 263′W), Lapa, Paraná, Brazil, April 2004.

Specimens studied. holotype—MZUSP 7964, 8 paratypes—MZUSP 7965a–h.

Etymology. The specific epithet originates from Greek and refers to the absence of shield on the superficial bar (an = without, absence; aspidus = shield).

Description. Body fusiform 271 (235–299, n = 7) long, greatest width at level of midlength 66 (42–84, n = 7). Unicellular cephalic glands, head organ conspicuous. Proximal pharyngeal bulb 26 (23–35, n = 7) long, 31 (25–38, n = 7) wide, ovate; distal pharyngeal bulb 22 (17–30, n = 7) long, 25 (18–33, n = 7) wide, ovate. MCO 9 (8–11, n = 3) in diameter, bulbous, armed with spine, one row of spinelets, with 9–11 morphologically different spinelets. Seminal vesicle ovate, connected to the MCO by a short duct. Testis 20 (15–30, n = 5) diameter, rounded, ventral, overlapped to germarium. Germarium 15 (13–17, n = 5) long, 18 (14–25, n = 5) wide, ovate. Uterus with up to two generations of embryos. Follicles, apparently glandular, disposed ventrally in U-shape, posterior to the terminations of the caeca. Haptor 59 (50–74, n = 5) long, 63 (56–70, n = 3) wide. Anchor 43 (41–45, n = 6) long; shaft slightly curved; point straight; superficial root short; deep root knob like. Superficial bar 16 (12–20, n = 4) long, 6 (7–9, n = 4) wide, subrectangular. Shield on the superficial bar absent. Deep bar 11 (10–13, n = 3) long, 1 (1–2, n = 3) wide, ribbon shaped, with small constriction near midlength. Hook shank 16 (14–19, n = 6) long; hooklet 8 (6–10, n = 6) long; point and shaft continuous, evenly curved; shelf concave, toe pointed; heel rounded.

Remarks. Gyrodactylus anaspidus n. sp. has no shield on the superficial bar. The absence of a shield in Gyrodactylus species is not an original observation—it was observed in G. emembranatus Malmberg, 1970 , G. longidactylus Geets, 1998 , G. funduli Hargis, 1955 and Gyrodactylus inesperatus Boeger, Ferreira, Vianna & Patella, 2014 , among others ( Boeger et al. 2014).

Gyrodactylus anaspidus View in CoL n. sp. possesses a hooklet most similar to G. superbus View in CoL and has a toe pointed, as described for G. corydori View in CoL , G. superbus View in CoL and G. scleromystaci Bueno-Silva & Boeger, 2014 View in CoL . Moreover, all of these species are different from G. anaspidus View in CoL n. sp. by presenting a shield on the superficial bar ( Popazoglo & Boeger 2000; Bueno-Silva & Boeger 2009, 2014).

The new species can be differentiated from other Gyrodactylus View in CoL species described previously by their species of neotropical siluriform hosts and by the armature of the MCO. Double rows of spinelets on the MCO are present in G. anisopharynx View in CoL , which has 3–4 (internal row) and 2–3 (external row); G. bueni View in CoL , which has 3–4 and 2–3; G. corydori View in CoL , which has 4–5 and 2–3; G. major View in CoL , which has 5–7 and 4–6; G. samirae View in CoL , which has 3 and 4–6; G. scleromystaci View in CoL , which has 5–7 and 4–5; and G. superbus View in CoL , which has 4 and 5. Gyrodactylus pimelodellus View in CoL exhibits one row of six spinelets while G. anaspidus View in CoL n. sp. has 9–11 spinelets in one row (see Popazoglo & Boeger 2000; Bueno-Silva & Boeger 2009; 2014).

Gyrodactylus anaspidus View in CoL n. sp. co-occurs with Aglaiogyrodactylus salebrosus Kritsky, Vianna & Boeger, 2007 View in CoL , Aglaiogyrodactylus ctenistus Kritsky, Vianna & Boeger, 2007 View in CoL and A. conei Kritsky, Vianna & Boeger, 2007 View in CoL , all of which are oviparous gyrodactylids and parasitize P. parmula View in CoL within the same locality.

Kingdom

Animalia

Phylum

Platyhelminthes

Class

Monogenea

Order

Gyrodactylidea

Family

Gyrodactylidae

Genus

Gyrodactylus

Loc

Gyrodactylus anaspidus

Vianna, Rogério T. & Boeger, Walter A. 2019
2019
Loc

Gyrodactylus anaspidus

Vianna & Boeger 2019
2019
Loc

G. anaspidus

Vianna & Boeger 2019
2019
Loc

G. anaspidus

Vianna & Boeger 2019
2019
Loc

Gyrodactylus anaspidus

Vianna & Boeger 2019
2019
Loc

G. scleromystaci

Bueno-Silva & Boeger 2014
2014
Loc

G. bueni

Bueno-Silva & Boeger 2014
2014
Loc

G. major

Bueno-Silva & Boeger 2014
2014
Loc

G. scleromystaci

Bueno-Silva & Boeger 2014
2014
Loc

G. corydori

Bueno-Silva & Boeger 2009
2009
Loc

G. corydori

Bueno-Silva & Boeger 2009
2009
Loc

Aglaiogyrodactylus salebrosus

Kritsky, Vianna & Boeger 2007
2007
Loc

Aglaiogyrodactylus ctenistus

Kritsky, Vianna & Boeger 2007
2007
Loc

A. conei

Kritsky, Vianna & Boeger 2007
2007
Loc

P. parmula

Pereira 2005
2005
Loc

G. superbus

Popazoglo & Boeger 2000
2000
Loc

G. superbus

Popazoglo & Boeger 2000
2000
Loc

G. anisopharynx

Popazoglo & Boeger 2000
2000
Loc

G. samirae

Popazoglo & Boeger 2000
2000
Loc

G. superbus

Popazoglo & Boeger 2000
2000
Loc

Gyrodactylus pimelodellus

An, Jara & Cone 1991
1991
Loc

Gyrodactylus

von Nordmann 1832
1832
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