Table 1.
Extended penis length in animals.
| common name | scientific name | penis length relative to body length | references |
|---|---|---|---|
| burrowing barnacle | Cryptophialus minutus | 8.0 | Darwin (1854) |
| Japanese acorn barnacle | Tetraclita japonica | 3.9 | Murata et al. (2001) |
| Pacific acorn barnacle | Balanus glandula | 3.6 | C. J. Neufeld (unpublished data) |
| rove beetle | Aleochara tristis | 2.0 | Gack & Peschke (2005) |
| Argentine lake duck | Oxyura vittata | 1.0 | McCracken et al. (2001) |
| hat snail | Calyptraea morbida | 1.0 | Chen & Soong (2000) |
| seed bug | Lygaeus simulans | 1.0 | Tadler (1999) |
| feather mite | Proterothrix sp. | 1.0 | H. Proctor (2007, personal communication) |
| sand flea | Tunga penetrans | 1.0 | H. Proctor (2007, personal communication) |
| slipper limpet | Crepidula spp. | 0.6 | Brown & Olivares (1996) |
| spider | Tidarren spp. | 0.5 | Ramos et al. (2004) |
| ostracod | Candona suburbana | 0.3 | Cohen & Morin (1990) |