Bryofaunal gastrotrichs from the Cerrado: First report of <i>Dendroichthydium</i> cf. <i>ibyrapora</i> from a Neotropical Savanna

Minowa, Axell K.; Ferreira, Vitor R. P.; Garraffoni, André R. S.

doi:10.1590/1676-0611-BN-2025-1753

person Axell K. Minowa *

contributed to conception · data analysis and interpretation · taxonomic identification · manuscript preparation

schoolUniversidade Estadual de Campinas, Instituto de Biologia, Departamento de Biologia Animal, Laboratório de Evolução de Organismos Meiofaunais, 13083-970, Campinas, SP, Brasil.

0000-0002-2962-6053

person Vitor R. P. Ferreira

contributed to field works and identification · manuscript preparation

schoolUniversidade de Brasília, Instituto de Biologia, Departamento de Zoologia, Laboratório de Desenvolvimento e Metamorfose de Diptera, 70910-900, Brasília, DF, Brasil.

0000-0003-3361-7827

person André R. S. Garraffoni

contributed to conception · supervision · taxonomic identification · data interpretation · manuscript preparation · revision · editing · research funding

schoolUniversidade Estadual de Campinas, Instituto de Biologia, Departamento de Biologia Animal, Laboratório de Evolução de Organismos Meiofaunais, 13083-970, Campinas, SP, Brasil.

0000-0002-6303-7244

person* Corresponding author: axellkouminowa@gmail.com

Conflicts of Interest

The authors declare that they have no conflict of interest related to the publication of this manuscript.

Ethics

This study did not involve human beings and/or clinical trials that should be approved by any Institutional Committee.

Associate Editor

Mercedes Marchese

Figures (3)
Tables (1)

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Figure 1 Dendroichthydium cf. ibyrapora photomicrographs of fresh animals in differential interference contrast (A) and phase contrast (B–E). A. Ventral view, with lateral slight squeezing in the mid-trunk by the semicircular muscles, adhesive tubes bent outward from the furcal base. B. Mid-plane optical section view, with large eggs filling the entire trunk, furcal base with short spined furcal scales. C. Composition image of mid-plane optical section. D. Mid-plane of the head. E. Dorsal view of posterior trunk with straight intestine in between the large eggs, furcal base covered laterally by keeled scales. Abbreviations: at, anterior ciliary tuft; ce, cephalion; eg, egg; fks, furcal keeled scales; fs, furcal base short-spined scales; mo, mouth; pb, posterior sensory bristle; ps, pedunculated scales; scm, semicircular muscle insertion. Scales: A–E. 10 µm.

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Figure 2 Dendroichthydium cf. ibyrapora photomicrographs (differential interference contrast) of fixed animals. A. Lateral view of contracted specimen, with adhesive tubes bent ventrally from the furcal base. Dorsally positioned egg lightly squeezed at the middle by semicircular muscle. B. Mid-plane optical section with internal organs. C-D. Dorsal view. Abbreviations: ce, cephalion; eg, egg; mo, mouth; ps, pedunculated scales; scm, semicircular muscle insertion. Scales: A. 20 µm, B–D 10 µm.

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Figure 3 Dendroichthydium cf. ibyrapora composition from scanning electron microscope micrographs. Ventral view showing ventral plates from base of hypostomium to terminal plates in posteriormost furcal base. Abbreviations: ad, adhesive tubes; ci, ventral locomotory row’s cilia insertion; ct, cephalic ventral cilia tuft; hy, hypostomium; pl, hypopleurae; ps, pedunculated scales; tp, terminal plates; vp, ventral plates. Scale: 5 µm.

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Table 1 Comparative morphometric table.The measurements of the four specimens sampled in present study compared to morphometric values of original description of Dendroichthydium ibyrapora. Measurements in µm.

	Specimens considered in the present study						Minowa et al. (2025)
Features measurement	Ind01	Ind02	Ind03	Ind04	Range	Average	Range	Average
Total body length	81.70	72.60	102.90	82.30	72.60–102.90	84.88	130.00–160.00	148.00
Maximum head width	17.97	16.54	16.76	15.75	15.75–17.97	16.75	29.00–30.60	29.70
Maximum neck width	13.70	10.89	12.20	9.69	9.69–13.70	11.62	20.00–23.30	21.40
Maximum trunk width	27.25	27.26	25.80	25.15	25.15–27.26	26.37	36.00–50.10	45.20
Hypostomium width	–	6.67	–	–	6.67	6.67	6.00–9.80	8.00
Hypostomium length	–	2.63	–	–	2.63	2.63	3.00–4.90	3.60
Cephalion width	7.88	8.45	–	–	7.88–8.45	8.16	14.00–15.10	14.30
Cephalion length	04.01	5.13	–	–	4.01–5.13	4.57	6.5	6.50
Diameter of mouth ring	5.98	7.59	5.74	4.36	4.36–7.59	5.92	8.00–9.80	9.20
Pharynx length	24.85	17.14	26.36	23.96	17.14–26.36	23.08	34.00–40.50	37.30
Pharynx width	7.80	4.90	6.70	6.17	4.90–7.80	6.39	7.00–11.90	9.50
Width of intestine junction	5.16	-	-	-	5.16	5.16	9.00–11.70	10.40
Intestine length	38.00	31.00	42.90	36.00	31.00–42.90	36.98	55.00–89.60	70.90
Pharynx-intestine ratio I	0.65	0.55	0.61	0.67	0.55–0.67	0.62	0.50–0.60
Furca length	25.90	25.90	30.02	25.05	25.05–30.02	26.72	28.00–37.60	32.10
Length of adhesive tube	19.07	12.36	19.03	15.25	12.36–19.07	16.43	16.00–20.10	17.70
Width of adhesive tube	1.38	0.71	1.57	1.50	0.71–1.57	1.29	2.00–3.60	2.30
Number of scales in single dorsal longitudinal column	–	–	–	40	40.00	40.00	57.00–90.00	70.00
Total number of longitudinal alternating rows of scales	–	–	–	67	67.00	67.00	50.00–80.00	65.00
Total number of interciliary plates	–	–	–	41	41.00	41.00	30.0	30.0
Interciliary plates width	–	–	–	8.3	8.3	8.3

Bryofaunal gastrotrichs from the Cerrado: First report of Dendroichthydium cf. ibyrapora from a Neotropical Savanna

Gastrótricos briofaunais do Cerrado: Primeiro registro de Dendroichthydium cf. ibyrapora de uma savana neotropical

Abstract