Package {allometry}

Title:	Examples of Datasets on Allometry
Version:	0.2.0
Description:	Examples of datasets on allometry, the study of the relationship of biological traits to body size. This package contains the datasets of morphological measurement taken from 113 maritime earwigs (Anisolabis maritima) by Matsuzawa and Konuma (2025) <doi:10.1093/biolinnean/blaf031>, and taken from 507 Helm’s stag beetles (Geodorcus helmsi) collected by Grey et al. (2025) <doi:10.1093/biolinnean/blae024>.
License:	GPL (≥ 3)
Encoding:	UTF-8
URL:	https://github.com/tabe/allometry
BugReports:	https://github.com/tabe/allometry/issues
RoxygenNote:	7.3.2
Suggests:	testthat (≥ 3.0.0)
Config/testthat/edition:	3
Depends:	R (≥ 3.5)
LazyData:	true
NeedsCompilation:	no
Packaged:	2026-05-23 15:04:03 UTC; abe
Author:	Takeshi Abe [aut, cre]
Maintainer:	Takeshi Abe <tabe@fixedpoint.jp>
Repository:	CRAN
Date/Publication:	2026-05-23 16:20:02 UTC

Morphological measurement taken from 113 maritime earwigs (Anisolabis maritima); 68 males and 45 females.

Description

Morphological measurement taken from 113 maritime earwigs (Anisolabis maritima); 68 males and 45 females.

Usage

earwigs

Format

A data frame with twelve variables:

id

ID (integer; starting from 1, ending at 115; 11 and 12 are missing)

sex

Sex (factor; male or female)

head_width

Head width (mm)

head_length

Head length (mm)

thorax_width

Thorax width (mm)

thorax_length

Thorax length (mm)

abdomen_width

Abdomen width (mm)

abdomen_length

Abdomen length (mm)

right_forcep_length

Right forcep length (mm)

left_forcep_length

Left forcep length (mm)

right_forcep_width

Right forcep width (mm)

left_forcep_width

Left forcep width (mm)

For further details, see Tomoki Matsuzawa, Junji Konuma, Positive allometry in the forceps of the female earwig Anisolabis maritima (Dermaptera: Anisolabididae), Biological Journal of the Linnean Society, Volume 145, Issue 2, June 2025, blaf031, doi:10.1093/biolinnean/blaf031.

Morphological measurement of 507 Helm’s stag beetles (Geodorcus helmsi) from Stewart Island, New Zealand.

Description

Morphological measurement of 507 Helm’s stag beetles (Geodorcus helmsi) from Stewart Island, New Zealand.

Usage

helmsi

Format

A data frame with 17 variables:

museum_number

Accession number used by museum to identify specimens (factor)

collection

The museum or the collection event associated with specimens (factor)

sex

Sex (factor; Male, Female, or Larva)

body_length

The sum of the head, pronotum and elytra (mm)

mandible_length

Length of the left mandible from the hinge to the tip (mm)

inside_mandible_length

Length of the left mandible from the tip to the base of the mandible at the boundary between the exposed part and the semi-exposed part (mm)

mandible_tooth_1

Length of tooth 1 on left mandible from tip to lateral edge of mandible (mm)

mandible_tooth_2

Length of tooth 2 on left mandible from tip to lateral edge of mandible (mm)

mandible_tooth_3

Length of tooth 3 on left mandible from tip to lateral edge of mandible (mm)

mandible_tooth_4

Length of tooth 4 on left mandible from tip to lateral edge of mandible (mm)

head_length

Length from the anterior margin of the clypeus to the anterior margin of the pronotum (mm)

head_width

Width of the head from the lateral margin of each eye (mm)

pronotum_length

Length of the pronotum from anterior margin of pronotum to the positon margin of pronotum (mm)

pronotum_width

Width of pronotum at widest part of pronotum (mm)

elytra_length

Length of elytra from anterior margin of scutellum to posterior margin of elytra (mm)

elytra_width

Width of elytra at widest point of elytra (mm)

method

Method used from measuring beetles (factor; Callipers or Digital)

For further details, see L Grey, G I Holwell, J M Jandt, S Johnson, Weapon allometry and shape variation in the Helm’s stag beetle (Geodorcus helmsi), Biological Journal of the Linnean Society, Volume 144, Issue 1, January 2025, blae024, doi:10.1093/biolinnean/blae024.