A new species of Microtetrameres (Nematoda, Tetrameridae) parasitizing Buteogallus urubitinga (Aves, Accipitridae) from northeastern Argentina

DÍAZ, MARIANO Dueñas; DRAGO, FABIANA B.; NÚÑEZ, VERÓNICA

doi:10.1590/0001-3765201820170967

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Biological Sciences • An. Acad. Bras. Ciênc. 90 (3) • Sept 2018 • https://doi.org/10.1590/0001-3765201820170967 linkcopy

A new species of Microtetrameres (Nematoda, Tetrameridae) parasitizing Buteogallus urubitinga (Aves, Accipitridae) from northeastern Argentina

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A new tetramerid nematode, Microtetrameres urubitinga n. sp., is described from specimens recovered from the proventriculus of the great black-hawk, Buteogallus urubitinga (Aves: Accipitridae), from Formosa Province, Argentina. The males of the new species are characterized by having spicules unequal (length ratio of spicules 1:3.8–5.9) and dissimilar in shape (right spicule with a simple tip, left spicule with a symmetrical bifurcated tip), caudal papillae arranged asymmetrically (two pairs precloacal and two pairs postcloacal) and cloacal lips highly protruded forming a tube. The gravid females are permanently coiled clockwise or counterclockwise in a spiral and having a tail tapering gradually to a sharp point, with a cuticular fold. This is the first nominal species of Microtetrameres (Travassos, 1915) described parasitizing birds from Argentina. The relationship between the diet of B. urubitinga and the low prevalence of M. urubitinga n. sp. is discussed.

Key words
Accipitridae; Argentina; Buteogallus urubitinga; Microtetrameres urubitinga n. sp.; Tetrameridae

	M. urubitingan. sp.	M. cruzi	M. minima	M. pusilla
Source	Present study	Travassos 1914	Travassos 1914	Travassos 1915, 1919
Country	Argentina	Brazil	Brazil	Brazil
Hosts	B. urubitinga	N. swainsoni,M. flavifrons	T. c. brunneus	T. rufiventris,T. flavipes
Body length	2020–2540	1170–1400	1400	3500–4000
Body width	60–71	85	-----	100–120
Buccal capsule depth	19–24	12	-----	17
Buccal capsule inner diameter	5–7	4–5	-----	7
Oesophagus	660–780	383	-----	900^***
Muscular portion	250–280	93	-----	300
Glandular portion	380–530	290	-----	600^**
Glandular/muscular portion	1.5–1.7	3.1^*	-----	2^***
Oesophagus/body length (%)	33	27–33^*	-----	23–26^***
Left spicule	770–1040	651–787	990	1320
Right spicule	130–260	82	100	85
Length ratio of spicules	3.8–5.9	7.9–9.6^*	9.9^*	15.5^*
Body/left spicule length	2–3.2	1.5–2.2^*	1.4^*	2.7–3*
Tail	140–160	132	-----	170

	M. urubitingan. sp.	M. cruzi	M. minima	M. pusilla
Source	Present study	Travassos 1914	Travassos 1914	Travassos 1915, 1919
Country	Argentina	Brazil	Brazil	Brazil
Hosts	B. urubitinga	N. swainsoni,M. flavifrons	T. c. brunneus	T. rufiventris,T. flavipes
Body length	1285–2430	2000	780	2000
Body width	743–1029	1500	640	1500
Buccal capsule depth	17–21	16–20	12	10–19
Buccal capsule inner diameter	10–11	8	-----	9–12
Oesophagus	770–1020	780	563
Muscular portion	160–210	160	73	210–273
Glandular portion	590–800	620	490	530–974
Glandular/muscular portion	3–3.9	3.9^*	6.7^*	2.5–3.6^*
Distance nerve ring-anterior end	119–220	-----	-----	-----
Distance vulva- posterior end	161–240	300	-----	-----
Tail	161–240	74–100	68	140
Eggs	48–52 x 24	50–60 x 24–28	45 x 24	42–49 x 28–35

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[1] ^* Calculated from original descriptions. ^**Estimated from plate XXV, figure 3 of Travassos (1919) given that Travassos (1915) described an oesophagus of 0.042 mm long, but evidently refers to width. ^*** Calculated from plate XXV figure 3 of Travassos (1919) and original description.