Have a personal or library account? Click to login
Morphological Ambiguity between Chambersiella Cobb, 1920, and Geraldius Sanwal, 1971: A Taxonomic Dilemma Solved through a Note from N. A. Cobb Cover

Morphological Ambiguity between Chambersiella Cobb, 1920, and Geraldius Sanwal, 1971: A Taxonomic Dilemma Solved through a Note from N. A. Cobb

Open Access
|Nov 2025

Figures & Tables

Figure 1:

(A) Typewritten note by N. A. Cobb and filed with the type specimen of Chambersiella rodens Cobb, 1920 pointing out that the specimen had two uteri. (B) Photomicrograph of a female of Chambersiella sp. from entry number 11034, slide G-1671, from the USDANC, collected by J. Saunders via Gerald Thorne or Mae Noffsinger from the beetle gallery of Scolytus mutistriatus Marsham, 1802 showing a didephic ovary. (C) Photomicrograph of a female of Chambersiella rodens Cobb, 1920 collected from a seed cone of Japanese cedar, Cryptomeria japonica (L. f.) D. Don.
(A) Typewritten note by N. A. Cobb and filed with the type specimen of Chambersiella rodens Cobb, 1920 pointing out that the specimen had two uteri. (B) Photomicrograph of a female of Chambersiella sp. from entry number 11034, slide G-1671, from the USDANC, collected by J. Saunders via Gerald Thorne or Mae Noffsinger from the beetle gallery of Scolytus mutistriatus Marsham, 1802 showing a didephic ovary. (C) Photomicrograph of a female of Chambersiella rodens Cobb, 1920 collected from a seed cone of Japanese cedar, Cryptomeria japonica (L. f.) D. Don.

Morphometric of females of Chambersiella rodens Cobb, 1920, C_ inserrai Cid del Prado et al_, 2021 C_ bakeri Sanwal, 1957, C_ galapagoensis Cid del Prado, 2012 and C_ jejuensis Mwamula et al_, 2025 from the original descriptions, additional measurements of C_ bakeri by Holovachov, and original measurements of C_ rodens by Eisenback and Vieira_

CharacterC. rodens (Cobb, 1920)C. rodens (this study)C. inserrai (Cid del Prado et al., 2021)C. bakeri (Sanwal, 1957)C. bakeri (Holovachov et al., 2003)C. galapagoensis (Cid del Prado et al., 2021)C. jejuensis (Mwamula et al., 2025)
n155101916
L(670)905–1,354 (1,077)1,000–1,200 (1,100)1,100–1,300 (1,200)1,001–1,200 (1,100)800–1,200 (1,000)1,040–1,306 (1,163)
a(27.0)19.6–24.0 (21.4)24.6–28.8 (26.9)17.6–23.5 (20.7)19.3–35 (25.0)23.6–30.3 (26.9)
b(5.0)4.1–5.8 (4.6)4.5–5.1 (4.9)4.4–5.3 (4.9)4.4–5.3 (4.9)4.9–6.8 (5.7)4.9–5.9 (5.4)
c(15.6)7.2–10.7 (9.0)8.9–14.5 (10.3)8.0–9.5 (8.88.0–9.5 (8.9)8.1–10.8 (9.6)7.0–7.9 (7.4)
c′(2.1)3.7–5.4 (4.6)3.3–5.8 (5.0)4.1–6.3 (5.2)4.1–6.3 (5.1)3.7–6.3 (4.7)5.7–7.2 (6.3)
V%(58)42.0–53.3 (51.1)47.3–53.9 (49.9)48.8–52.3 (50.0)48.8–52.3 (50.2)39–50 (47)46.8–49.3 (48.0)
Esophagus l.(135.3)218.5––262.0 (235.9)215–247 (228.0)224–248 (236)224–248 (238.0)141–207 (179)207.0–227.0 (217.2)
Corpus130.9––136.3 (135)134–143 (139.4)120–138 (129)120–138 (131)112–145 (125)123.5–140.0 (131.4)
Excretory pore163.2––202.0 (178.7)155–185 (16(6.5))171–190 (180)171–190 (178)73–161 (133)148.0–183.0 (164.9
Tail length(42.9)102.0––142.0 (120.4)116–127 (121.3)121–144 (132)121–144 (131)81–121 (105)146.0–177.0 (156.4)
BDA(20.8)25.0––28.8 (27.0)21–27 (22.6)23–31 (27)23–31 (26)18–28 (24.4)22.5–27.0 (24.8)
Ant. to NR(85.1)140.1––151.0 (146.1)145–166 (154.5)144–165 (157)110–145 (130.5)131.0–155.5 (145.0)
Phasmid to anus27.1––43.0 (37)40–47 (43.2)33–46 (39)33–46 (39.8)32–51 (40.5)55.0–78.5 (64.8)
Ant. to deirid154–166 (159.0)166–190 (178)166–190 (178)129–152 (138)149.0–183.0 (165.4)
BD at vulva(24.8)43.6––58.9 (48.2)42–50 (45.6)35–64 (49)33.5–45.5 (40.4)
BD maximum(24.8)45.9––60.8 (50.1)38–48 (41.4)46–67 (57)46–67 (55.8)30–55 (41)38.0–48.0 (43.3)
DOI: https://doi.org/10.2478/jofnem-2025-0051 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Language: English
Submitted on: Aug 12, 2025
|
Published on: Nov 5, 2025
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2025 Jonathan D. Eisenback, Paulo Vieira, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 57 (2025): Issue 1 (February 2025)